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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 
FORM 10-Q
 
     
þ   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 2005
OR
     
o   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from                                           to                                          
Commission File Number 000-50743
 
ALNYLAM PHARMACEUTICALS, INC.
(Exact name of registrant as specified in its charter)
     
Delaware   77-0602661
(State or other jurisdiction of   (I.R.S. Employer
incorporation or organization)   Identification No.)
     
300 Third Street, Cambridge, MA   02142
     
(Address of principal executive    
offices)   (Zip Code)
(617) 551-8200
(Registrant’s telephone number, including area code)
     Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o
     Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ
     As of August 1, 2005, the registrant had 21,200,676 shares of Common Stock, $0.01 par value per share, outstanding.
 
 

 


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INDEX
         
    PAGE
    NUMBER
PART I. FINANCIAL INFORMATION
       
 
       
ITEM 1. FINANCIAL STATEMENTS
       
 
       
    1  
    2  
    3  
    4  
 
       
    10  
 
       
    36  
 
       
    37  
 
       
       
 
       
    38  
 
       
    38  
 
       
    39  
 
       
    40  
  EX-3.1 Restated Certificate of Incorporation
  EX-10.3 Forms of Incentive Stock Option
  EX-10.6 Amendment No. 1 to dated August 2,2004
  EX-10.8 Agreement Garching Innovation GmbH
  EX-31.1 Section 302 Certification of CEO
  EX-31.2 Section 302 Certification of CFO
  Ex-32.1 Section 906 Certification of CEO
  EX-32.2 Section 906 Certification of CFO

 


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ALNYLAM PHARMACEUTICALS, INC.
CONSOLIDATED BALANCE SHEETS
(In thousands, except share and per share amounts)
(Unaudited)
                 
    June 30,   December 31,
    2005   2004
ASSETS
               
Current assets:
               
Cash and cash equivalents
  $ 9,165     $ 20,272  
Marketable securities
    22,477       25,774  
Collaboration and license receivables
    679       859  
Related party notes receivable
    281       310  
Prepaid expenses and other current assets
    1,238       966  
 
               
Total current assets
    33,840       48,181  
Property and equipment, net of accumulated depreciation of $3,704 and $2,464 at June 30, 2005 and December 31, 2004, respectively
    11,084       11,694  
Intangible assets, net of accumulated amortization of $907 and $670 at June 30, 2005 and December 31, 2004, respectively
    3,168       3,405  
Restricted cash
    2,313       2,313  
Other assets
    457       514  
 
               
Total assets
  $ 50,862     $ 66,107  
 
               
 
               
LIABILITIES AND STOCKHOLDERS’ EQUITY
               
Current liabilities:
               
Accounts payable
  $ 1,612     $ 910  
Accrued liabilities
    4,243       3,875  
Current portion of note payable
    1,776       790  
Deferred revenue
    1,390       1,000  
 
               
Total current liabilities
    9,021       6,575  
Deferred revenue
    3,584       4,083  
Deferred rent
    2,682       2,896  
Note payable, net of current portion
    6,187       6,411  
 
               
Total liabilities
    21,474       19,965  
 
               
 
               
Stockholders’ equity:
               
Preferred stock, $0.01 par value, 5,000,000 shares authorized and no shares issued and outstanding at June 30, 2005 and no shares authorized, issued or outstanding at December 31, 2004
           
Common stock, $0.01 par value, 125,000,000 shares authorized; 21,001,597 shares issued and 20,918,703 shares outstanding as of June 30, 2005 and 20,931,742 shares issued and 20,848,848 shares outstanding as of December 31, 2004
    209       208  
Additional paid-in capital
    112,902       112,216  
Deferred stock compensation
    (2,941 )     (3,697 )
Accumulated other comprehensive (loss) income
    (32 )     420  
Accumulated deficit
    (80,750 )     (63,005 )
 
               
Total stockholders’ equity
    29,388       46,142  
 
               
Total liabilities and stockholders’ equity
  $ 50,862     $ 66,107  
 
               
The accompanying notes are an integral part of these unaudited interim consolidated financial statements.

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ALNYLAM PHARMACEUTICALS, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
(In thousands, except share and per share amounts)
(Unaudited)
                                 
    Three Months Ended June 30,   Six Months Ended June 30,
    2005   2004   2005   2004
Net revenues
  $ 1,108     $ 131     $ 2,751     $ 265  
 
                               
 
                               
Cost and expenses:
                               
Research and development (1)
    9,190       4,159       14,562       14,594  
General and administrative (1)
    3,122       2,947       6,074       5,978  
 
                               
Total costs and expenses
    12,312       7,106       20,636       20,572  
 
                               
Loss from operations
    (11,204 )     (6,975 )     (17,885 )     (20,307 )
 
                               
Other income (expense):
                               
Interest income
    258       74       522       111  
Interest expense
    (248 )     (97 )     (473 )     (305 )
Other income (expense)
    49       42       91       (37 )
 
                               
Total other income (expense)
    59       19       140       (231 )
 
                               
Net loss
    (11,145 )     (6,956 )     (17,745 )     (20,538 )
Accretion of redeemable convertible preferred stock
          (751 )           (2,713 )
 
                               
Net loss attributable to common stockholders
  $ (11,145 )   $ (7,707 )   $ (17,745 )   $ (23,251 )
 
                               
 
                               
Net loss per common share — basic and diluted
  $ (0.54 )   $ (1.10 )   $ (0.86 )   $ (5.39 )
 
                               
 
                               
Weighted average common shares used to compute basic and diluted net loss per common share
    20,605,681       6,997,479       20,551,724       4,315,860  
 
                               
 
                               
Comprehensive loss:
                               
Net loss
  $ (11,145 )   $ (6,956 )   $ (17,745 )   $ (20,538 )
Foreign currency translation adjustments
    (256 )     (106 )     (454 )     (113 )
Unrealized gain on marketable securities
    33             2        
 
                               
 
                               
Comprehensive loss
  $ (11,368 )   $ (7,062 )   $ (18,197 )   $ (20,651 )
 
                               
 
                               
(1) Non-cash stock-based compensation expense included in these amounts are as follows:
                               
Research and development
  $ 568     $ (531 )   $ 741     $ 1,193  
General and administrative
    351       484       658       991  
 
                               
Total non-cash stock-based compensation
  $ 919     $ (47 )   $ 1,399     $ 2,184  
 
                               
The accompanying notes are an integral part of these unaudited interim consolidated financial statements.

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ALNYLAM PHARMACEUTICALS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
(Unaudited)
                 
    Six Months Ended June 30,
    2005   2004
Cash flows from operating activities:
               
Net loss
  $ (17,745 )   $ (20,538 )
Adjustments to reconcile net loss to net cash used in operating activities:
               
Depreciation and amortization
    1,627       965  
Gain on disposal of equipment
          (19 )
Non-cash stock-based compensation
    1,399       2,184  
Non-cash license expense
    2,093        
Realized foreign currency exchange gains
    (91 )      
Changes in operating assets and liabilities:
               
Collaboration and license receivables
    181       (3,000 )
Prepaid expenses and other current assets
    (265 )     (786 )
Accounts payable
    715       294  
Accrued liabilities
    (1,700 )     3,010  
Deferred revenue
    (103 )     2,948  
 
               
Net cash used in operating activities
    (13,889 )     (14,942 )
 
               
Cash flows from investing activities:
               
Purchases of property and equipment
    (975 )     (6,438 )
Proceeds from sale of equipment
          67  
Purchases of marketable securities
    (14,386 )     (15,457 )
Sales of marketable securities
    17,683       1,250  
 
               
Net cash provided by (used in) investing activities
    2,322       (20,578 )
 
               
Cash flows from financing activities:
               
Proceeds from issuance of common stock
    47       30,100  
Proceeds from issuance of Series D convertible preferred stock
          10,000  
Proceeds from note payable
    762       5,705  
Repayments of note payable
          (1,859 )
Decrease in restricted cash
          373  
Deferred financing costs incurred in connection with note payable
          (47 )
 
               
Net cash provided by financing activities
    809       44,272  
 
               
Effect of exchange rate on cash
    (349 )     (54 )
 
               
Net (decrease) increase in cash and cash equivalents
    (11,107 )     8,698  
Cash and cash equivalents, beginning of period
    20,272       23,193  
 
               
Cash and cash equivalents, end of period
  $ 9,165     $ 31,891  
 
               
 
               
Supplementary information:
               
Cash paid for interest
  $ 278     $ 155  
Fair value of warrant issued in connection with equipment line of credit included as deferred financing costs
          557  
Accretion of redeemable convertible preferred stock
          2,713  
Conversion of redeemable convertible preferred stock into common stock
          67,626  
The accompanying notes are an integral part of these unaudited interim consolidated financial statements.

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ALNYLAM PHARMACEUTICALS, INC.
NOTES TO UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation
     The accompanying condensed consolidated financial statements of Alnylam Pharmaceuticals, Inc. (the “Company” or “Alnylam”) are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States applicable to interim periods and, in the opinion of management, include all normal and recurring adjustments which are necessary to present fairly the results of operations for the reported periods. The Company’s condensed consolidated financial statements have also been prepared on a basis substantially consistent with, and should be read in conjunction with, the Company’s consolidated financial statements for the year ended December 31, 2004, which were filed in the Company’s Annual Report on Form 10-K with the Securities and Exchange Commission (the “SEC”) on March 30, 2005. The results of the Company’s operations for any interim period are not necessarily indicative of the results of the Company’s operations for any other interim period or for a full fiscal year.
Principles of Consolidation
     The accompanying condensed consolidated financial statements reflect the operations of the Company and its wholly-owned subsidiaries Alnylam U.S., Inc. and Alnylam Europe AG. All significant intercompany accounts and transactions have been eliminated.
Use of Estimates
     The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Accounting for Stock-Based Compensation
     Employee stock awards granted under the Company’s compensation plans are accounted for in accordance with Accounting Principles Board (“APB”) Opinion No. 25, “ Accounting for Stock Issued to Employees” (“APB 25”), and related interpretations. The Company has not adopted the fair value method of accounting for stock-based awards. All stock-based awards granted to non-employees are accounted for at their fair value in accordance with Financial Accounting Standards Board (“FASB”) Statement of Financial Accounting Standards (“SFAS”) No. 123 (“SFAS 123”), as amended, and Emerging Issues Task Force (“EITF”) Issue No. 96-18, “Accounting for Equity Instruments that are Issued to Other Than Employees for Acquiring, or in Conjunction with Selling, Goods or Services” (“EITF 96-18”) under which compensation expense is generally recognized over the vesting period of the award.
     Under the intrinsic value method, compensation associated with stock-based awards to employees is determined as the difference, if any, between the current fair value of the underlying common stock on the date compensation is measured and the price an employee must pay to exercise the award. The measurement date for employee awards is generally the grant date. Under the fair-value method, compensation associated with stock-based awards to non-employees is determined based on the estimated fair value of the award itself, measured using an established option pricing model. The measurement date for non-employee awards is generally the date performance of services is complete.

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ALNYLAM PHARMACEUTICALS, INC.
NOTES TO UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS (Continued)
     The Company provides the disclosure requirements of SFAS No. 148, “ Accounting for Stock Based Compensation — Transition and Disclosure, an amendment of FASB Statement No. 123” (“SFAS 148”). If compensation expense for the Company’s stock-based compensation plan had been determined based on the fair value at the grant dates as calculated in accordance with SFAS No. 123, the Company’s net loss attributable to common stockholders and net loss per common share would approximate the pro forma amounts below, in thousands, except per share amounts:
                                 
    Three Months Ended June 30,   Six Months Ended June 30,
    2005   2004   2005   2004
Net loss attributable to common stockholders
                               
Net loss, as reported
  $ (11,145 )   $ (7,707 )   $ (17,745 )   $ (23,251 )
Add employee stock-based compensation expense included in reported net loss
    441       852       956       1,605  
Deduct employee stock-based compensation expense determined under fair value method
    (1,004 )     (898 )     (1,812 )     (1,736 )
 
                               
 
                               
Net loss — pro forma
  $ (11,708 )   $ (7,753 )   $ (18,601 )   $ (23,382 )
 
                               
Net loss per common share (basic and diluted)
                               
As reported
  $ (0.54 )   $ (1.10 )   $ (0.86 )   $ (5.39 )
Pro forma
  $ (0.57 )   $ (1.11 )   $ (0.91 )   $ (5.42 )
     The effects of applying SFAS No. 123, as amended, are not necessarily representative of the effects on reported net income (loss) in future periods. Additional awards in future periods are anticipated, which will affect the amounts of stock-based compensation expense recorded when applying SFAS No. 123 in future periods.
Net Loss Per Common Share
     The Company accounts for and discloses net income (loss) per common share in accordance with SFAS No. 128 “Earnings per Share” . Basic net income (loss) per common share is computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding. Diluted net income (loss) per common share is computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares and dilutive potential common share equivalents then outstanding. Potential common shares consist of shares issuable upon the exercise of stock options and warrants (using the treasury stock method), unvested restricted stock awards and the weighted average conversion of the preferred stock into shares of common stock (using the if-converted method) for periods prior to the Company’s initial public offering, which was completed in June 2004. Because the inclusion of potential common stock would be anti-dilutive for all periods presented, diluted net loss per share is the same as basic net loss per share.
     The following table sets forth the potential common stock excluded from the calculation of net loss per share because their inclusion would be anti-dilutive:
                                 
    Three Months Ended June 30,   Six Months Ended June 30,
    2005   2004   2005   2004
Options to purchase common stock
    3,048,184       2,051,885       3,048,184       2,051,885  
Warrants to purchase common stock
    52,630       65,787       52,630       65,787  
Unvested restricted common stock
    181,011       524,003       181,011       524,003  
Common stock issued in connection with Garching amendment
    270,000             270,000        
Options that were exercised before vesting
    77,074       6,737       81,960       121,804  
 
                               
 
    3,628,899       2,648,412       3,633,785       2,763,479  
 
                               

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ALNYLAM PHARMACEUTICALS, INC.
NOTES TO UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS (Continued)
Segment Information
     Management uses consolidated financial information in determining how to allocate resources and assess financial performance. For this reason, the Company has determined that it is principally engaged in one industry segment.
     The following table presents total long-lived tangible assets by geographic area as of June 30, 2005 and December 31, 2004, in thousands:
                 
    June 30,   December 31,
    2005   2004
Long-lived tangible assets:
               
United States
  $ 8,606     $ 8,919  
Germany
    2,478       2,775  
 
               
Total long-lived tangible assets
  $ 11,084     $ 11,694  
 
               
Recent Accounting Pronouncements
     In December 2004, the FASB issued SFAS No. 123R, “ Share-Based Payment ” (“SFAS 123R”), which revises SFAS No. 123, “ Accounting for Stock-based Compensation” and requires companies to expense the fair value of employee stock options and other forms of stock-based compensation. Under SFAS 123R, the most significant change in practice would be treating the fair value of stock based payment awards that are within its scope as compensation expense in the income statement beginning on the date that a company grants the awards to employees. In April 2005, the SEC delayed the effective date of SFAS 123R to financial statements issued for the first annual period beginning after June 15, 2005. As a result, the Company will adopt and comply with the requirements of SFAS 123R in the three months ending March 31, 2006. The Company is currently assessing the impact that the adoption of this standard will have on its financial position and results of operations and the method by which the Company will implement this standard, however, the Company expects stock compensation expense to increase as a result of the adoption of this standard.
2. NOTE PAYABLE
     In December 2002, the Company entered into an agreement with Silicon Valley Bank to establish an equipment line of credit for $2.5 million. The Company drew down a total of $2.1 million on this line of credit. Under the terms of the agreement with Silicon Valley Bank, borrowings bore interest at prime rate plus 0.25 percent as well as additional interest of 8.0 percent of the original principal payable upon the maturity of each equipment advance under this line of credit. In March 2004, the Company repaid all amounts outstanding under this line of credit, which represented an early repayment and resulted in interest penalties totaling $0.2 million that were included as interest expense in the three months ended March 31, 2004.
     On March 26, 2004, the Company entered into an agreement with Lighthouse Capital Partners V, L.P. (“Lighthouse”) to establish an equipment line of credit for $10.0 million. On June 20, 2005, the parties amended the agreement to allow the Company the ability to draw down amounts under the line of credit through December 31, 2005 upon adherence to certain conditions. All borrowings under the line of credit are collateralized by the assets financed and the agreement contains certain provisions that restrict the Company’s ability to dispose of or transfer these assets. Borrowings bear interest at prime rate plus 3 percent (9.00% at June 30, 2005). The Company was required to make interest only payments on all draw-downs made during the period from March 26, 2004 through June 30, 2005 at which point all draw-downs made prior to June 30, 2005 will be repaid over 48 months. All draw-downs subsequent to June 30, 2005 will be repaid in equal installments over the period from the applicable draw-down date through June 2009. On the maturity of each equipment advance under the line of credit, the Company is required to pay, in addition to the paid principal and interest, an additional amount of 11.5 percent of the original principal. This amount is being accrued over the applicable borrowing period as additional interest expense. In connection with the agreement, the Company issued to Lighthouse and an affiliate of Lighthouse warrants to

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ALNYLAM PHARMACEUTICALS, INC.
NOTES TO UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS (Continued)
purchase redeemable convertible preferred stock, which were converted into warrants to purchase 52,630 shares of the Company’s common stock at an exercise price of $9.50 per share upon the closing of the Company’s initial public offering in June 2004. The Company recorded the fair value of these warrants of $0.6 million as a deferred financing cost which is being amortized to interest expense over the repayment term of the first advance of 63 months. The fair value of the warrants was calculated using the Black-Scholes option pricing model with the following assumptions: 100% volatility, risk-free interest rate of 3.49%, no dividend yield, and a seven-year term. In conjunction with entering into the agreement with Lighthouse in March 2004, Alnylam paid off the remaining balance of the loan with Silicon Valley Bank, of $1.9 million, via an initial draw in the amount of the payoff balance.
     As of June 30, 2005, future cash payments under the note payable to Lighthouse, including interest, are as follows in thousands:
         
Remainder of 2005
  $ 1,195  
2006
    2,389  
2007
    2,389  
2008
    2,389  
2009
    2,111  
 
       
Total
    10,473  
Less: portion representing interest
    2,510  
 
       
Principal
    7,963  
Less: current portion
    1,776  
 
       
Long-term portion
  $ 6,187  
 
       
3. SIGNIFICANT AGREEMENTS
Merck & Co., Inc.
Technology Collaboration and License Agreement
     In connection with an alliance with Merck & Co., Inc. (“Merck”) in September 2003, Merck made an upfront cash payment of $2.0 million and a $5.0 million equity investment in the Company during 2003. In addition, in connection with this agreement the Company received $1.0 million in additional license fee payments from Merck in September 2004 and $7.0 million in December 2004 upon the attainment of a pre-specified technology milestone. Of the $7.0 million received in December 2004, $5.0 million was from the sale of 710,273 shares of the Company’s common stock and $2.0 million represented a cash milestone. A further $1.0 million cash payment is due from Merck in September 2005, based upon the continuation of the alliance. The Company is recognizing the revenue related to the upfront and license payments ratably over the estimated period of performance under the agreement, which the Company has determined to be six years. In the three and six months ended June 30, 2005, the Company recognized revenue of $0.1 million and $0.3 million, respectively, under this agreement and has deferred revenue on its balance sheet of $2.1 million related to this agreement at June 30, 2005.

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ALNYLAM PHARMACEUTICALS, INC.
NOTES TO UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS (Continued)
      Ocular Collaboration Agreement
     In June 2004, the Company entered into a collaboration and license agreement with Merck. The agreement is a multi-year collaboration to develop and commercialize RNAi therapeutics for ocular diseases. This collaboration, the second strategic alliance between Merck and the Company, will focus on age-related macular degeneration (“AMD”) and other ocular diseases caused by abnormal growth or leakage of small blood vessels in the eye. The Company’s existing program to develop a Direct RNAi™ therapeutic for the treatment of AMD has been incorporated into this collaboration.
     Under the terms of the agreement, the Company received a $2.0 million license fee from Merck as well as $1.0 million representing reimbursement of prior research and development costs incurred by the Company. These up-front amounts have been deferred and will be recognized as revenue over the estimated period of performance under the collaboration agreement, which the Company has determined to be six years. In addition, the agreement provides for the Company to work on two additional mutually agreed ocular targets in addition to its vascular endothelial growth factor (“VEGF”) program with Merck. Merck and the Company will jointly fund the development of, and share the profits from, any RNAi therapeutics for the United States market that result from the collaboration. The Company will also have the option to co-promote these RNAi therapeutics in the United States. Marketing and sales outside of the United States will be conducted by Merck, with the Company receiving royalties. During the three and six months ended June 30, 2005, the Company recorded net cost reimbursement revenues of $0.6 million and $1.8 million, respectively, which represent $0.7 million and $2.0 million, respectively, of research and development costs to be reimbursed by Merck under the terms of the agreement less $0.1 million and $0.2 million, respectively, of research and development costs to be reimbursed by the Company to Merck. The Company also recorded revenues of $0.1 million and $0.3 million, respectively, in the three and six months ended June 30, 2005 from the amortization of the up-front payments received from Merck and has $2.5 million of deferred revenue on its balance sheet related to this agreement at June 30, 2005.
GeneCare Research Institute Co., Ltd.
     In January 2005, the Company entered into a license agreement with GeneCare Research Institute Co., Ltd. (“GeneCare”) whereby the Company licensed to GeneCare an exclusive license through the Company’s InterfeRx™ licensing program to discover, develop, and commercialize RNAi therapeutics directed against two DNA helicase genes associated with cancer. Under the terms of this agreement, GeneCare agreed to make an initial payment of $0.2 million and annual license fee payments of $0.1 million during each year of the research term, which is initially three years and can be extended to up to five years. In addition, GeneCare agreed to provide the Company with a payment of $0.4 million for each potential product that GeneCare chooses to begin development efforts as well as milestone payments of up to $6.0 million per product, in the event that development scientific milestones are achieved by GeneCare. The Company recorded $0.2 million of revenues related to this agreement in the three months ended March 31, 2005.
Cystic Fibrosis Foundation Therapeutics, Inc.
     In March 2005, the Company entered into a collaboration with Cystic Fibrosis Foundation Therapeutics, Inc. (“CFFT”) to investigate the potential for RNAi therapeutics to treat cystic fibrosis (“CF”). Under this collaboration, CFFT provided the Company with an initial payment of $0.5 million and will make additional payments totaling an aggregate of $1.0 million in the event that certain scientific milestones are achieved. In addition to funding, CFFT will provide the Company with access to certain scientific resources to support the Company’s siRNA discovery and development efforts. If the discovery and development efforts under this collaboration result in the identification of siRNAs that are candidates for further development, the parties may negotiate a mutually agreeable support arrangement for further phases of development. In the event that the Company develops a marketable therapeutic for the treatment of CF, the Company will be required to pay CFFT certain pre-determined royalties. The Company recorded revenues of $0.2 million in the three months ended June 30, 2005 commensurate with the work performed in the three months ended June 30, 2005 in relation to the overall effort expected to be expended under this collaboration. The Company has $0.3 million of deferred revenue on its balance sheet related to this agreement at June 30, 2005.

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ALNYLAM PHARMACEUTICALS, INC.
NOTES TO UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS (Continued)
Garching Innovation GmbH
     In June 2005, the Company entered into an amendment agreement with Garching Innovation GmbH (“Garching”). This amendment eliminated the requirement that the Company maintain operations in Germany that are comparable to its operations in the United States and replaced this provision with a requirement that the Company maintain a minimum level of employees in Germany until December 2007. This amendment ensures the Company’s exclusivity to use and sublicense certain patented technology to develop and commercialize therapeutic products and related applications. In connection with this amendment, the Company agreed to issue 270,000 shares of its common stock, which was valued at $2.1 million. The Company recorded the consideration as license fee expense in the three months ended June 30, 2005 as the technology had not reached technological feasibility and does not have any alternative future use.
4 . SUBSEQUENT EVENT
Shareholders’ Rights Agreement
     On July 13, 2005, the Board of Directors of the Company declared a dividend of one right (collectively, the “Rights”) to buy one one-thousandth of a share of newly designated Series A Junior Participating Preferred Stock (“Series A Junior Preferred Stock”) for each outstanding share of the Company’s common stock, $.01 par value per share (“Common Stock”), to stockholders of record at the close of business on July 26, 2005. Initially, the Rights are not exercisable and will be attached to all certificates representing outstanding shares of Common Stock, and no separate Rights Certificates will be distributed. The Rights will expire at the close of business on July 13, 2015 unless earlier redeemed or exchanged. Until a right is exercised, the holder thereof, as such, will have no rights as a stockholder of the Company, including the right to vote or to receive dividends. The rights are not immediately exercisable. Subject to the terms and conditions of the Rights Agreement entered into by the Company with EquiServe Trust Company, N.A., as Rights Agent (the “Rights Agreement”), the Rights will become exercisable upon the earlier of (1) 10 business days following the later of (a) the first date of a public announcement that a person or group (an “Acquiring Person”) acquires, or obtained the right to acquire, beneficial ownership of 20 percent or more of the outstanding shares of common stock of the Company or (b) the first date on which an executive officer of the Company has actual knowledge that an Acquiring Person has become such or (2) 10 business days following the commencement of a tender offer or exchange offer that would result in a person or group beneficially owning more than 20 percent of the outstanding shares of common stock of the Company. Each right entitles the holder to purchase one one-thousandth of a share of Series A Junior Preferred Stock at an initial purchase price of $80.00 in cash, subject to adjustment. In the event that any person or group becomes an Acquiring Person, unless the event causing the 20% threshold to be crossed is a Permitted Offer (as defined in the Rights Agreement), each Right not owned by the Acquiring Person will entitle its holder to receive, upon exercise, that number of shares of common stock of the Company (or in certain circumstances, cash, property or other securities of the Company) which equals the exercise price of the Right divided by 50% of the current market price (as defined in the Rights Agreement) per share of such common stock at the date of the occurrence of the event. In the event that, at any time after any person or group becomes an Acquiring Person, (i) the Company is consolidated with, or merged with and into, another entity and the Company is not the surviving entity of such consolidation or merger (other than a consolidation or merger which follows a Permitted Offer) or if the Company is the surviving entity, but shares of its outstanding Common Stock are changed or exchanged for stock or securities (of any other person) or cash or any other property, or (ii) more than 50% of the Company’s assets or earning power is sold or transferred, each holder of a Right (except Rights which previously have been voided as set forth in the Rights Agreement) shall thereafter have the right to receive, upon exercise, that number of shares of common stock of the acquiring company which equals the exercise price of the Right divided by 50% of the current market price of such common stock at the date of the occurrence of the event.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
      This Quarterly Report on Form 10-Q contains forward-looking statements that involve risks and uncertainties. The statements contained in this Quarterly Report on Form 10-Q that are not purely historical are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Without limiting the foregoing, the words “may,” “will,” “should,” “could,” “expects,” “plans,” “intends,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue,” “target” and similar expressions are intended to identify forward-looking statements. All forward-looking statements included in this Quarterly Report on Form 10-Q are based on information available to us up to, and including the date of this document, and we assume no obligation to update any such forward-looking statements. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of certain important factors, including those set forth below under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Certain Factors That May Affect Future Results” and elsewhere in this Quarterly Report on Form 10-Q. You should carefully review those factors and also carefully review the risks outlined in other documents that we file from time to time with the Securities and Exchange Commission.
Overview
     We are a biopharmaceutical company seeking to develop and commercialize new drugs that work through a recently discovered mechanism in cells known as RNA interference, or RNAi. We believe that RNAi therapeutics have the potential to become a major class of drugs with applications in a wide range of therapeutic areas. We have initiated programs to develop RNAi therapeutics that will be administered directly to diseased parts of the body, which we call Direct RNAi™. We are also working to extend our capabilities by investing in RNAi therapeutics that will be administered systemically in order to treat a broad range of diseases, which we call Systemic RNAi™. To realize the potential of RNAi therapeutics, we are developing capabilities that we can apply to any specific short interfering RNA, or siRNA, in a systematic way to endow it with drug-like properties. We use the term “product engine” to describe these capabilities because we believe they will enable us to develop many products across a variety of therapeutic areas.
     We commenced operations in June 2002. Since our inception, we have generated significant losses. As of June 30, 2005, we had an accumulated deficit of $80.8 million. We have funded our operations primarily through the net proceeds of $89.9 million from the sale of equity securities, including $29.9 million in net proceeds from the sale of 5.75 million shares of our common stock from our initial public offering in June 2004. Through June 30, 2005, a substantial portion of our total net revenues have been derived from our two strategic alliances with Merck and Co., Inc., or Merck. In September 2003, we began working with Merck under a collaboration agreement for the development of RNAi-based technology and therapeutics. In June 2004, we began working with Merck under a cost sharing collaboration agreement for the co-development of Direct RNAi therapeutics for the treatment of ocular diseases. We expect our revenues to continue to be derived primarily from strategic alliances and license fee revenues.
     We have yet to submit any drug applications to any regulatory authority. We have focused our efforts since inception primarily on business planning, research and development, acquiring intellectual property rights, recruiting management and technical staff, and raising capital. We currently have programs focused in a number of therapeutic areas, however, we are unable to predict when, if ever, we will be able to commence sales of any product. We have not achieved profitability on a quarterly or annual basis and we expect to incur significant additional losses over the next several years. We expect our net losses to increase primarily due to research and development activities relating to our collaborations, drug development programs and other general corporate activities. We anticipate that our operating results will fluctuate for the foreseeable future. Therefore, period-to-period comparisons should not be relied upon as predictive of the results in future periods. Our sources of potential funding for the next several years are expected to include proceeds from the sale of equity, license and other fees, funded research and development payments, proceeds from equipment lines of credit and milestone payments under existing and future collaborative arrangements.
      Research and Development
     Since our inception, we have focused on drug discovery and development programs. Research and development expenses represent a substantial percentage of our total operating expenses. We have initiated programs to identify specific RNAi therapeutics that will be administered directly to diseased parts of the body, which we refer to as Direct RNAi drug candidates, and we expect to initiate additional programs as the capabilities of our product engine evolve. Included in our current programs are development programs, those which we have established targeted timing for human clinical trials, and preclinical programs, those which we have

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yet to establish targeted timing for human clinical trials. Our current development programs are focused on age-related macular degeneration, or AMD, and human respiratory syncytial virus infection, or RSV infection. Included as part of our preclinical programs are programs focused on Parkinson’s disease, or PD, spinal cord injury, or SCI, cystic fibrosis, or CF, and pandemic influenza, or pandemic flu.
     A significant component of our business strategy is to enter into strategic alliances and collaborations with pharmaceutical companies, academic institutions, research foundations and others, as appropriate, to gain access to funding, technical resources and intellectual property to further our development efforts and to generate revenues. We have entered into license agreements with Garching Innovation GmbH, or Garching, and Isis Pharmaceuticals, Inc., or Isis, as well as a number of other entities, to obtain rights to important intellectual property in the field of RNAi. We have entered into collaboration agreements with Merck for both the development of RNAi technology and therapeutics and the development of RNAi therapeutics for treatment of ocular diseases, both of which have provided us with significant funding and access to substantial technical resources, which has helped us further our development efforts in many areas. In particular, in conjunction with Merck we have begun evaluating RNAi therapeutics in animal models and expect to begin a clinical trial for an AMD product candidate in the second half of 2005. In addition, we have entered into an agreement with Cystic Fibrosis Foundation Therapeutics, Inc., or CFFT, to obtain funding and technical resources for our CF program. We also have a collaboration with Medtronic, Inc., a leading medical technology company, to focus on developing novel-drug device combinations incorporating RNAi therapeutics for the treatment of neurodegenerative diseases such as PD, Huntington’s and Alzheimer’s. In addition, we have collaborations with the Mayo Foundation for Medical Education and Research and the Mayo Clinic Jacksonville to explore the potential of an RNAi-based treatment for PD, and with researchers from the University of Georgia to discover and develop a Direct RNAi therapeutic for the treatment and prevention of respiratory infection related to pandemic flu as well as other collaborations in connection with our RSV program. Under both our PD and RSV programs we have begun evaluating RNAi therapeutics in animal models and expect to begin a clinical trial for an RSV product candidate in the first half of 2006.
     There is a risk that any drug discovery and development program may not produce revenue because of the risks inherent in drug discovery and development. Moreover, there are uncertainties specific to any new field of drug discovery, including RNAi. The successful development of any product candidate we develop is highly uncertain. Due to the numerous risks associated with developing drugs, we cannot reasonably estimate or know the nature, timing and estimated costs of the efforts necessary to complete the development of, or the period in which material net cash inflows are expected to commence from, any potential product candidate. These risks include the uncertainty of:
    our ability to progress any product candidates into preclinical and clinical trials;
 
    the scope, rate and progress of our preclinical trials and other research and development activities;
 
    the scope, rate of progress and cost of any clinical trials we commence;
 
    clinical trial results;
 
    the cost of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights;
 
    the terms and timing of any collaborative, licensing and other arrangements that we may establish;
 
    the cost and timing of regulatory approvals;
 
    the cost and timing of establishing sales, marketing and distribution capabilities;
 
    the cost of establishing clinical and commercial supplies of any products that we may develop; and
 
    the effect of competing technological and market developments.
     Any failure to complete any stage of the development of any potential products in a timely manner could have a material adverse effect on our operations, financial position and liquidity. A discussion of some of the risks and uncertainties associated with completing our projects on schedule, or at all, and the potential consequences of failing to do so, are set forth in “Certain Factors That May Affect Future Results” below.

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      Critical Accounting Policies and Estimates
     There have been no changes to our critical accounting policies and estimates, as described in the “Management Discussion and Analysis of Financial Condition and Results of Operations” section of our Annual Report on Form 10-K for the year ended December 31, 2004.
Results of Operations
     The following data summarizes the results of our operations for the periods indicated, in thousands:
                                 
    Three Months Ended June 30,   Six Months Ended June 30,
    2005   2004   2005   2004
Net revenues
  $ 1,108     $ 131     $ 2,751     $ 265  
Operating expenses
    12,312       7,106       20,636       20,572  
 
                               
Loss from operations
    (11,204 )     (6,975 )     (17,885 )     (20,307 )
 
                               
Net loss
  $ (11,145 )   $ (6,956 )   $ (17,745 )   $ (20,538 )
 
                               
      Discussion of Results of Operations for the Three and Six Months Ended June 30, 2005 and 2004
      Revenues
     The following table summarizes our total consolidated revenues in the periods indicated, in thousands:
                                 
    Three Months Ended June 30,   Six Months Ended June 30,
    2005   2004   2005   2004
Revenues recorded from the amortization of up-front and license payments
  $ 486     $ 131     $ 978     $ 265  
Revenues recorded from cost reimbursement research collaboration agreement
    709             1,960        
Cost reimbursements to Merck under collaboration agreement
    (87 )           (187 )      
 
                               
Total revenues recorded
  $ 1,108     $ 131     $ 2,751     $ 265  
 
                               
     Under our September 2003 collaboration and license agreement with Merck, we have received up-front and license payments which have been deferred and are being recognized as revenue over six years, the estimated period of performance under this agreement. In September 2003, we received a $2.0 million payment and in September 2004, we received an additional payment of $1.0 million from Merck related to this agreement. We recognized revenues of $0.1 million and $0.3 million from the amortization of these payments in the three and six months ended June 30, 2005, respectively, as compared to less than $0.1 million and $0.2 million in the three and six months ended June 30, 2004, respectively.
     In June 2004, we entered into an additional collaboration and license agreement with Merck for the co-development of RNAi therapeutics for the treatment of ocular diseases. Under the terms of the agreement, we received a $2.0 million license fee from Merck as well as $1.0 million representing reimbursement of prior research and development costs which we incurred on our AMD program targeting vascular endothelial growth factor, or VEGF. These amounts are being amortized into revenues over the estimated period of performance under the collaboration agreement of six years. As such, we recorded $0.1 million and $0.3 million of revenues in the three and six months ended June 30, 2005, respectively, from the amortization of these payments. In addition to up-front and milestone payments, this agreement provides for the sharing of research costs incurred under this agreement. In the three and six months ended June 30, 2005, we recorded net revenues of $0.6 million and $1.8 million, respectively, from these cost-sharing activities.
     In March 2005, we entered into a collaboration agreement with CFFT to investigate the potential for RNAi therapeutics to treat CF. Under this collaboration, CFFT provided us with an initial payment of $0.5 million and will make additional payments totaling an aggregate of $1.0 million in the event that certain

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scientific milestones are achieved. In addition to funding, CFFT will provide us with access to certain scientific resources to support our siRNA discovery and development efforts. If the discovery and development efforts under this collaboration result in the identification of siRNAs that are candidates for further development, the parties may negotiate a mutually agreeable support arrangement for further phases of development. In the event that we develop a marketable therapeutic for the treatment of CF, we will be required to pay CFFT certain pre-determined royalties. We recorded revenues of $0.2 million in the three months ended June 30, 2005 under this collaboration.
     In addition to our collaboration agreements, we have an InterfeRx program under which we license our intellectual property to others for the development and commercialization of RNAi therapeutics in narrowly defined therapeutic areas in which we are not currently engaged. We have also granted licenses to our intellectual property to others for the development and commercialization of research reagents and services. We expect these programs to provide revenues from license fees and royalties on sales by the licensees, such as our January 2005 license agreement with GeneCare Research Institute Co., Ltd., or GeneCare, a Japanese biotechnology firm. Under this agreement we received a license payment from GeneCare of $0.2 million, which was recorded as revenue in the three months ended March 31, 2005.
     For the foreseeable future, we expect our revenues to continue to be derived primarily from strategic alliances, collaborations and licensing activities.
Operating Expenses
     The following tables summarize our operating expenses for the periods indicated, in thousands and as a percentage of total expenses and provide the changes in thousands and percentages:
                                                 
    Three           Three        
    Months   % of   Months   % of    
    Ended   total   Ended   total    
    June 30,   operating   June 30,   operating   Increase
    2005   expenses   2004   expenses   $   %
Research and development
  $ 9,190       75 %   $ 4,159       59 %   $ 5,031       121 %
 
                                               
General and administrative
    3,122       25 %     2,947       41 %     175       6 %
 
                                               
 
                                               
Total operating expenses
  $ 12,312       100 %   $ 7,106       100 %   $ 5,206       73 %
 
                                               
                                                 
    Six           Six        
    Months   % of   Months   % of    
    Ended   total   Ended   total   Increase
    June 30,   operating   June 30,   operating   (Decrease)
    2005   expenses   2004   expenses   $   %
Research and development
  $ 14,562       71 %   $ 14,594       71 %   $ (32 )      
 
                                               
General and administrative
    6,074       29 %     5,978       29 %     96       2 %
 
                                               
 
                                               
Total operating expenses
  $ 20,636       100 %   $ 20,572       100 %   $ 64        
 
                                               

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      Research and development
     The following tables summarize the most significant components of our research and development expenses for the periods indicated, in thousands and as a percentage of total research and development expenses and provides the changes in thousands and percentages:
                                                 
    Three           Three        
    Months           Months        
    Ended   % of   Ended   % of    
    June 30,   expense   June 30,   expense   Increase (Decrease)
    2005   category   2004   category   $   %
Research and development
                                               
Compensation-related
  $ 1,681       18 %   $ 1,372       33 %   $ 309       23 %
External services
    2,518       28 %     840       20 %     1,678       200 %
License fees
    2,215       24 %     706       17 %     1,509       214 %
Lab supplies and materials
    759       8 %     803       20 %     (44 )     (5 %)
Facilities-related
    1,117       12 %     713       17 %     404       57 %
Stock-based compensation
    568       6 %     (531 )     (13 %)     1,099       207 %
Other
    332       4 %     256       6 %     76       30 %
 
                                               
 
                                               
Total research and development
  $ 9,190       100 %   $ 4,159       100 %   $ 5,031       121 %
 
                                               
     As indicated in the table above, the increase in research and development expenses in the three months ended June 30, 2005 as compared to the three months ended June 30, 2004 was primarily due to higher external service costs associated with consulting and contract research primarily in support of the stage of development of our RSV and AMD programs. Higher license fees, due to $2.1 million in non-cash license fees related to the amendment of our license agreement with Garching in June 2005 and higher non-cash stock based compensation, due primarily to increases in the fair value of stock options granted to non-employees, contributed significantly to the increase in research and development expenses in the three months ended June 30, 2005.
                                                 
                    Six        
    Six Months           Months        
    Ended   % of   Ended   % of   Increase
    June 30,   expense   June 30,   expense   (Decrease)
    2005   category   2004   category   $   %
Research and development
                                               
Compensation-related
  $ 3,199       22 %   $ 2,738       19 %   $ 461       17 %
External services
    3,544       24 %     1,580       11 %     1,964       124 %
License fees
    2,269       16 %     5,706       39 %     (3,437 )     (60 %)
Lab supplies and materials
    1,927       13 %     1,619       11 %     308       19 %
Facilities-related
    2,235       15 %     1,270       9 %     965       76 %
Stock-based compensation
    741       5 %     1,193       8 %     (452 )     (38 %)
Other
    647       5 %     488       3 %     159       33 %
 
                                               
 
                                               
Total research and development
  $ 14,562       100 %   $ 14,594       100 %   $ (32 )      
 
                                               
     As indicated in the table above, research and development expenses decreased slightly in the six months ended June 30, 2005 as compared to the six months ended June 30, 2004. The most significant items affecting this decrease were license fees, which were higher in the six months ended June 30, 2004 due to a $5.5 million charge associated with our March 2004 agreement with Isis and stock-based compensation, which decreased due to fluctuations in our stock price, the amount of options granted in the prior years at higher estimated values, and the accelerated method used to amortize the resulting deferred stock based compensation which records a higher percentage of the associated expense in the earlier years of the awards. These decreases were offset in part by increases in external services, including consulting and contracted research with third parties, as we continue to expand our research organization in support of the stage of development of our RSV and AMD programs.

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     We expect to continue to devote a substantial portion of our resources to research and development expenses. Compensation and related costs also increased in both the three and six months ended June 30, 2005 as compared to the three and six months ended June 30, 2004 due to the timing and size of the expansion of our research and development organization, which increased from 47 employees at June 30, 2004 to 58 at June 30, 2005. In addition to the increase in employees in our research organization, we improved our research infrastructure by moving into new corporate headquarters and research facilities in Cambridge, Massachusetts in April 2004, which resulted in increased facilities-related costs in both the three and six months ended June 30, 2005 as compared to the three months ended June 30, 2005.
     Prior to July 1, 2004, we did not track any of our research and development costs or our personnel and personnel-related costs on a project-by-project basis, because the majority of our efforts were focused on the development of capabilities associated with our product engine rather than on specific projects. In July 2004, we began work under our agreement with Merck for the co-development of RNAi ocular therapeutics. This agreement is a cost sharing arrangement whereby each party reimburses the other for 50% of the costs incurred under the project, as defined by the agreement. Costs reimbursed under the agreement include certain direct external costs and a negotiated full-time equivalent labor rate for the actual time worked on the project. As a result, we began tracking direct external costs attributable to this agreement and the actual time worked by our employees on this agreement in July 2004. However, a significant portion of our research and development expenses are not tracked on a project-by-project basis. Direct external costs incurred in the three and six months ended June 30, 2005 under our agreement with Merck for the co-development of RNAi ocular therapeutics were $0.2 million and $0.4 million, respectively, which includes $0.1 million and $0.2 million billed to us by Merck for the three and six months ended June 30, 2005, respectively, which is recorded as a reduction of revenue. In addition, all of our research programs are currently in the preclinical phase meaning that we are conducting formulation, efficacy, pharmacology and/or toxicology testing of compounds in animal models and/or biochemical assays.
      General and administrative
     The following tables summarize the most significant components of our general and administrative expenses for the periods indicated, in thousands and as a percentage of total general and administrative expenses and provides the changes in thousands and percentages:
                                                 
    Three           Three        
    Months           Months        
    Ended   % of   Ended   % of   Increase
    June 30,   expense   June 30,   expense   (Decrease)
    2005   category   2004   category   $   %
General and administrative
                                               
Compensation-related
  $ 873       28 %   $ 658       22 %   $ 215       33 %
Consulting and professional services
    905       29 %     820       28 %     85       10 %
Facilities-related
    476       15 %     568       19 %     (92 )     (16 %)
Stock-based compensation
    351       11 %     484       17 %     (133 )     (27 %)
Insurance
    147       5 %     66       2 %     81       123 %
Other
    370       12 %     351       12 %     19       5 %
 
                                               
 
                                               
Total general and administrative
  $ 3,122       100 %   $ 2,947       100 %   $ 175       6 %
 
                                               
     As indicated in the table above, general and administrative expenses increased in the three months ended June 30, 2005 versus the three months ended June 30, 2004 due to compensation and related costs associated with the hiring of additional employees, consulting and professional services and insurance costs associated with our operation as a publicly traded company beginning in June 2004. Partially offsetting these increases was a decrease in stock-based compensation as a result of the accelerated method used to amortize the associated deferred compensation, which records a higher percentage of the associated expense in the earlier years of the award.

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                    Six        
    Six Months           Months        
    Ended   % of   Ended   % of   Increase
    June 30,   expense   June 30,   expense   (Decrease)
    2005   category   2004   category   $   %
General and administrative
                                               
Compensation-related
  $ 1,631       27 %   $ 1,798       30 %   $ (167 )     (9 %)
Consulting and professional services
    1,719       28 %     1,672       28 %     47       3 %
Facilities-related
    984       16 %     839       14 %     145       17 %
Stock-based compensation
    658       11 %     991       17 %     (333 )     (34 %)
Insurance
    306       5 %     97       1 %     209       215 %
Other
    776       13 %     581       10 %     195       34 %
 
                                               
 
                                               
Total general and administrative
  $ 6,074       100 %   $ 5,978       100 %   $ 96       2 %
 
                                               
     As indicated in the table above, general and administrative expenses increased in the six months ended June 30, 2005 versus the three months ended June 30, 2004 due to insurance costs and consulting and professional services associated with our operation as a publicly traded company beginning in June 2004. Partially offsetting these increases were decreases in stock-based compensation as a result of the accelerated method used to amortize the associated deferred compensation, which records a higher percentage of the associated expense in the earlier years of the award compensation related costs, and compensation costs, which were higher in the six months ended June 30, 2004 as a result of costs associated with certain managerial changes incurred in the six months ended June 30, 2004.
      Interest income, interest expense and other
     Interest income increased to $0.3 million and $0.5 million for the three and six months ended June 30, 2005, respectively, compared to less than $0.1 million and $0.1 million for the three and six months ended June 30, 2004, respectively. These increases are due to our higher average cash, cash equivalent and marketable securities balances in the three and six months ended June 30, 2005 which were primarily a result of the net proceeds of $29.9 million from our initial public offering in June 2004, the issuance of $10.0 million of our Series D preferred stock in March 2004 and the issuance of $5.0 million of common stock to Merck in December 2004.
     Interest expense was $0.2 million and $0.5 million for the three and six months ended June 30, 2005, respectively, compared to $0.1 million and $0.3 million in the three and six months ended June 30, 2004, respectively. Interest expense for the three and six months ended June 30, 2004 is related to our borrowings for equipment purchases under our previous Silicon Valley Bank line of credit and the premium paid to pay off this line of credit in March 2004. Interest expense for the three and six months ended June 30, 2005 is the result of borrowings under our line of credit with Lighthouse Capital Partners V, L.P., or Lighthouse, used to finance capital equipment purchases. We expect that our interest expense will increase as we finance additional capital expenditures during the remainder of 2005 using our line of credit with Lighthouse.
     Other income (expense) increased to $49,000 and $91,000 in the three and six months ended June 30, 2005, respectively, from $42,000 and ($37,000) in the three and six months ended June 30, 2004, respectively. These increases are due primarily to realized foreign currency gains on intercompany transactions as a result of the decrease in the conversion rate of the Euro versus the U.S. Dollar in the three months and six months ended June 30, 2005.

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Liquidity and Capital Resources
     The following table summarizes our cash flow activities for the periods indicated, in thousands:
                 
    Six Months Ended June 30,
    2005   2004
Net loss
  $ (17,745 )   $ (20,538 )
Adjustments to reconcile net loss to net cash used in operating activities
    5,028       3,130  
Changes in operating assets and liabilities
    (1,172 )     2,466  
 
               
Net cash used in operating activities
    (13,889 )     (14,942 )
Net cash provided by (used in) investing activities
    2,322       (20,578 )
Net cash provided by financing activities
    809       44,272  
Effect of exchange rate on cash
    (349 )     (54 )
 
               
Net increase (decrease) in cash and cash equivalents
    (11,107 )     8,698  
Cash and cash equivalents, beginning of period
    20,272       23,193  
 
               
Cash and cash equivalents, end of period
  $ 9,165     $ 31,891  
 
               
     We commenced operations in June 2002 and since our inception, we have generated significant losses. As of June 30, 2005, we had an accumulated deficit of $80.8 million. As of June 30, 2005, we had cash,cash equivalents and marketable securities of $31.6 million, compared to cash, cash equivalents and marketable securities of $46.0 million as of December 31, 2004. We invest primarily in cash equivalents, U.S. government obligations, high-grade corporate notes and commercial paper. Our investment objectives are primarily, to assure liquidity and preservation of capital and, secondarily, to obtain investment income. All of our investments in debt securities are recorded at fair value and are available for sale. Fair value is determined based on quoted market prices.
      Operating activities
     We have required significant amounts of cash to fund our operating activities as a result of net losses since our inception. Although this trend has continued in the six months ended June 30, 2005, our use of cash in our operating activities declined as compared to the six months ended June 30, 2004 due to our lower net loss and cash receipts in connection with our June 2004 collaboration with Merck, our January 2005 license agreement with GeneCare and our March 2005 collaboration with CFFT. Cash used in operating activities is adjusted for non-cash items to reconcile net loss to net cash used in operating activities. These non-cash adjustments primarily consist of stock-based compensation, depreciation, amortization and, in the six months ended June 30, 2005, non-cash license expense. Non-cash stock-based compensation has decreased due to fluctuations in our stock price directly impacting the fair values of options granted to non-employees and the accelerated method used to amortize deferred compensation recorded in connection with our issuance of stock options to employees and non-employees. A $2.1 million non-cash license expense recorded in the six months ended June 30, 2005 is related to the June 2005 amendment of our license agreement with Garching, which resulted in the issuance of 270,000 shares of our common stock in July 2005. Depreciation expense has increased as a result of additional property and equipment we have acquired to expand our research capacity and support the growth of our infrastructure, mainly in our new corporate headquarters and research facilities in Cambridge, Massachusetts, which we moved into in April 2004. Amortization expense is associated with intangible assets recorded in connection with our acquisition of Ribopharma AG, now Alnylam Europe AG, in July 2003. In addition, changes in our operating assets and liabilities have affected our net cash used in operating activities since our inception. The decrease in these changes is primarily due to decreases in accrued liabilities due primarily to our January 2005 payment of $2.0 million to Isis under our March 2004 license agreement.
      Investing activities
     In the six months ended June 30, 2004 we began investing the proceeds from our initial public offering and other equity financing proceeds in marketable securities which was our most significant investing activity during this period. In addition, we made significant investments in property and equipment during the six months ended June 30, 2004 due to the expansion of our operations into new corporate headquarters and research facilities in Cambridge, Massachusetts in April 2004. These activities resulted in a significant use of our cash in the six months ended June 30, 2004. As our move into these facilities was completed in April 2004, we have experienced a significant decline in purchases of property and equipment. While we continue to purchase property and equipment to support the growth of our research and overall operations, these purchases were considerably lower in the six months

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ended June 30, 2005 as compared to purchases made in the six months ended June 30, 2004. In the six months ended June 30, 2005, we increased our sales of marketable securities to fund our operating activities, which resulted in a net inflow of cash from investing activities during the six months ended June 30, 2005.
      Financing activities
     Since our inception, we have funded our operations primarily through the sale of equity securities. Through June 30, 2005, we raised approximately $54.8 million in net proceeds from the sale of redeemable convertible preferred stock and approximately $35.3 million from the sale of common stock, including $29.9 million from the sale of 5.75 million shares of our common stock in our initial public offering, which was completed in June 2004.
     Certain of our sales of equity securities have been in connection with our strategic collaboration and licensing agreements. In connection with our March 2004 collaboration and license agreement with Isis, Isis purchased 1,666,667 shares of our Series D preferred stock for $10.0 million, in March 2004, which were converted into 877,193 shares of our common stock upon the closing of our initial public offering in June 2004. In September 2003, we entered into a collaboration and license agreement with Merck for the development of RNAi-based technology and therapeutics. In connection with this agreement, Merck purchased 1,000,000 shares of our Series C preferred stock for $5.0 million, in September 2003, which were converted into 526,315 shares of our common stock upon the closing of our initial public offering and 710,273 shares of our common stock for $5.0 million in December 2004.
     In addition to sales of equity securities, we have financed a portion of our property and equipment purchases through the establishment of equipment lines of credit. In December 2002, we established a $2.5 million equipment line of credit under which we drew down approximately $2.1 million in 2003, of which $1.8 million was repaid in March 2004. In March 2004, we entered into an equipment line of credit with Lighthouse to finance leasehold improvements and equipment purchases of up to $10.0 million. The borrowings bear interest at 3% over the prime rate of interest (9.00% at June 30, 2005) plus an additional 11.5% due in July 2009. We were required to make interest-only payments on all draw-downs through June 30, 2005, at which point all draw-downs made prior to June 30, 2005 will be repaid over 48 months. All draw-downs subsequent to June 30, 2005 will be repaid in equal installments over the period from the applicable draw-down date through June 2009. The borrowings are collateralized by the assets financed. At June 30, 2005, we had an outstanding balance of $8.0 million under this facility. The terms of the Lighthouse agreement include covenants which limit our ability to sell or transfer certain assets or businesses. In June 2005, we entered into an amendment to our agreement with Lighthouse to extend the drawdown period of the loan through December 31, 2005.
     Based on our current operating plan, we believe that our existing resources, together with the cash we expect to generate under our current alliances, will be sufficient to fund our planned operations through the end of 2006, during which time we expect to extend the capabilities of our technology platform, further the development of our products and continue to prosecute patent applications and otherwise build and maintain our patent portfolio. However, we may require significant additional funds earlier than we currently expect in order to develop and commence clinical trials for any product candidates we identify.
     We expect to seek additional funding through collaborative arrangements and public or private financings. Additional funding may not be available to us on acceptable terms or at all. In addition, the terms of any financing may adversely affect the holdings or the rights of our stockholders. For example, if we raise additional funds by issuing equity securities, further dilution to our existing stockholders may result. If we are unable to obtain funding on a timely basis, we may be required to significantly curtail one or more of our research or development programs. We also could be required to seek funds through arrangements with collaborators or others that may require us to relinquish rights to some of our technologies or product candidates that we would otherwise pursue.
     Even if we are able to raise additional funds in a timely manner, our future capital requirements may vary from what we expect and will depend on many factors, including the following:
    our progress in demonstrating that siRNAs can be active as drugs;
 
    our ability to develop relatively standard procedures for selecting and modifying siRNA drug candidates;
 
    progress in our research and development programs, as well as the magnitude of these programs;
 
    the timing, receipt, and amount of milestone and other payments, if any, from present and future collaborators, if any;

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    our ability to establish and maintain additional collaborative arrangements;
 
    the resources, time and costs required to successfully initiate and complete our preclinical and clinical trials, obtain regulatory approvals, protect our intellectual property and obtain and maintain licenses to third-party intellectual property;
 
    the cost of preparing, filing, prosecuting, maintaining, and enforcing patent claims; and
 
    the timing, receipt and amount of sales and royalties, if any, from our potential products.
      Off-Balance Sheet Arrangements
     We do not have any off-balance sheet arrangements or relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities.
      Contractual Obligations and Commitments
     The disclosure of our contractual obligations and commitments is set forth under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources” in our 2004 Annual Report on Form 10-K. Except as described below, there have been no material changes in our contractual obligations and commitments since December 31, 2004.
     In June 2005, we entered into an amendment agreement with Garching. This amendment eliminated the requirement that we maintain operations in Germany that are comparable to our operations in the United States and replaced this provision with a requirement that we maintain a minimum level of employees in Germany until December 2007. This amendment ensures our continued exclusivity to use and sublicense certain patented technology to develop and commercialize therapeutic products and related applications. In consideration for the rights to continue the exclusivity, we agreed to issue 270,000 shares of our common stock, which was valued at $2.1 million. We recorded this transaction as license fee expense in June 2005 as the technology had not reached technological feasibility and does not have any alternative future use.
      Recently Issued Accounting Pronouncements
     In December 2004, the Financial Accounting Standards Board (“FASB”) issued Statement of Financial Accounting Standard (“SFAS”) No. 123R, “ Share-Based Payment ” (“SFAS 123R”), which revises SFAS No. 123, “ Accounting for Stock-based Compensation” and requires companies to expense the fair value of employee stock options and other forms of stock-based compensation. Under SFAS 123R, the most significant change in practice would be treating the fair value of stock based payment awards that are within its scope as compensation expense in the income statement beginning on the date that a company grants the awards to employees. In April 2005, the SEC delayed the effective date of SFAS 123R to financial statements issued for the first annual period beginning after June 15, 2005. As a result, we will adopt and comply with the requirements of SFAS 123R in the three months ending March 31, 2006. We are currently assessing the impact that the adoption of this standard will have on our financial position and results of operations and the method by which we will implement this standard, however, we expect stock compensation expense to increase as a result of the adoption of this standard.

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CERTAIN FACTORS THAT MAY AFFECT FUTURE RESULTS
          We caution you that the following important factors, among others, could cause our actual results to differ materially from those expressed in forward-looking statements made by us or on our behalf in filings with the SEC, press releases, communications with investors and oral statements. Any or all of our forward-looking statements in this Quarterly Report on Form 10-Q and in any other public statements we make may turn out to be wrong. They can be affected by inaccurate assumptions we might make or by known or unknown risks and uncertainties. Many factors mentioned in the discussion below will be important in determining future results. Consequently, no forward-looking statement can be guaranteed. Actual future results may vary materially. We undertake no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise. You are advised, however, to consult any further disclosure we make in our reports filed with the SEC.
Risks Related to Our Business
Risks Related to Being an Early Stage Company
Because we have a short operating history, there is a limited amount of information about us upon which you can evaluate our business and prospects.
          Our operations began in June 2002 and we have only a limited operating history upon which you can evaluate our business and prospects. In addition, as an early stage company, we have limited experience and have not yet demonstrated an ability to successfully overcome many of the risks and uncertainties frequently encountered by companies in new and rapidly evolving fields, particularly in the biopharmaceutical area. For example, to execute our business plan, we will need to successfully:
    execute product development activities using an unproven technology;
 
    build and maintain a strong intellectual property portfolio;
 
    gain acceptance for the development and commercialization of our products;
 
    develop and maintain successful strategic relationships; and
 
    manage our spending as costs and expenses increase due to clinical trials, regulatory approvals and commercialization.
          If we are unsuccessful in accomplishing these objectives, we may not be able to develop product candidates, raise capital, expand our business or continue our operations.
The approach we are taking to discover and develop novel drugs is unproven and may never lead to marketable products.
          We have concentrated our efforts and therapeutic product research on RNAi technology, and our future success depends on the successful development of this technology and products based on RNAi technology. Neither we nor any other company has received regulatory approval to market therapeutics utilizing siRNAs. The scientific discoveries that form the basis for our efforts to discover and develop new drugs are relatively new. The scientific evidence to support the feasibility of developing drugs based on these discoveries is both preliminary and limited . Skepticism as to the feasibility of developing RNAi therapeutics has been expressed in scientific literature. For example, there are potential challenges to achieving safe RNAi therapeutics based on the so-called off-target effects and activation of the interferon response. There are also potential challenges to achieving effective RNAi therapeutics based on the need to achieve efficient delivery into cells and tissues in a clinically relevant manner and at doses that are cost-effective.
          Very few drug candidates based on these discoveries have ever been tested in animals or humans. siRNAs, the class of molecule we are trying to develop into drugs, do not naturally possess the inherent properties typically required of drugs, such as the ability to be stable in the body long enough to reach the tissues in which their effects are required, nor the ability to enter cells within these tissues in order to exert their effects. We currently have only limited data, and no conclusive evidence, to suggest that we can introduce these drug-like properties into siRNAs. We may spend large amounts of money trying to introduce these properties, and may never succeed in doing so. In addition, these compounds may not demonstrate in patients the chemical and pharmacological properties ascribed to them in laboratory studies, and they may interact with human biological systems in unforeseen, ineffective or harmful ways. As a result, we may never succeed in developing a marketable product. If we do not successfully develop and

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commercialize drugs based upon our technological approach, we will not become profitable and the value of our common stock will decline.
          Further, our focus solely on RNAi technology for developing drugs as opposed to multiple, more proven technologies for drug development increases the risks associated with the ownership of our common stock. If we are not successful in developing a product candidate using RNAi technology, we may be required to change the scope and direction of our product development activities. In that case, we may not be able to identify and implement successfully an alternative product development strategy.
Risks Related to Our Financial Results and Need for Financing
We have a history of losses and may never be profitable.
          We have experienced significant operating losses since our inception. As of June 30, 2005, we had an accumulated deficit of $80.8 million. To date, we have not developed any products nor generated any revenues from the sale of products. Further, we do not expect to generate any such revenues in the foreseeable future. We expect to continue to incur annual net operating losses over the next several years as we expand our efforts to discover, develop and commercialize RNAi therapeutics. We anticipate that the majority of any revenue we generate over the next several years will be from collaborations with pharmaceutical companies, but cannot be certain that we will be able to secure these collaborations or to meet the obligations or achieve any milestones that we may be required to meet or achieve to receive payments. To date, our collaboration and license agreements have provided us with minimal revenue. If we are unable to secure revenue from collaborations, we may be unable to continue our efforts to discover, develop and commercialize RNAi therapeutics without raising financing from other sources.
          To become and remain profitable, we must succeed in developing and commercializing novel drugs with significant market potential. This will require us to be successful in a range of challenging activities that we have yet to perform, including preclinical testing and clinical trial stages of development, obtaining regulatory approval for these novel drugs, and manufacturing, marketing and selling them. We may never succeed in these activities, and may never generate revenues that are significant enough to achieve profitability. Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. If we cannot become and remain profitable, the market price of our common stock could decline. In addition, we may be unable to raise capital, expand our business, diversify our product offerings or continue our operations.
We will require substantial additional funds to complete our research and development activities and if additional funds are not available we may need to critically limit, significantly scale back or cease our operations.
          We have used substantial funds to develop our RNAi technologies and will require substantial funds to conduct further research and development, including preclinical testing and clinical trials of any product candidates, and to manufacture and market any products that are approved for commercial sale. Because the successful development of our products is uncertain, we are unable to estimate the actual funds we will require to develop and commercialize them.
          Our future capital requirements and the period for which we expect our existing resources to support our operations may vary from what we expect. We have based our expectations on a number of factors, many of which are difficult to predict or are outside of our control, including:
    our progress in demonstrating that siRNAs can be active as drugs;
 
    our ability to develop relatively standard procedures for selecting and modifying siRNA drug candidates;
 
    progress in our research and development programs, as well as the magnitude of these programs;
 
    the timing, receipt, and amount of milestone and other payments, if any, from present and future collaborators, if any;
 
    our ability to establish and maintain additional collaborative arrangements;
 
    the resources, time and costs required to initiate and complete our preclinical and clinical trials, obtain regulatory approvals, protect our intellectual property and obtain and maintain licenses to third-party intellectual property; and

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    the timing, receipt and amount of sales and royalties, if any, from our potential products.
          If our estimates and predictions relating to these factors are incorrect, we may need to modify our operating plan.
          We will be required to seek additional funding in the future and intend to do so through either collaborative arrangements, public or private equity offerings or debt financings, or a combination of one or more of these funding sources. Additional funds may not be available to us on acceptable terms or at all. In addition, the terms of any financing may adversely affect the holdings or the rights of our stockholders. For example, if we raise additional funds by issuing equity securities, further dilution to our stockholders will result. Debt financing, if available, may involve restrictive covenants that could limit our flexibility in conducting future business activities. If we are unable to obtain funding on a timely basis, we may be required to significantly curtail one or more of our research or development programs. We also could be required to seek funds through arrangements with collaborators or others that may require us to relinquish rights to some of our technologies, product candidates or products that we would otherwise pursue on our own.
Risks Related to Our Dependence on Third Parties
We may not be able to execute our business strategy if we are unable to enter into alliances with other companies that can provide capabilities and funds for the development and commercialization of our drug candidates. If we are unsuccessful in forming or maintaining these alliances on favorable terms, our business may not succeed.
          We do not have any capability for sales, marketing or distribution and have limited capabilities for drug development. Accordingly, we must enter into alliances with other companies that can provide such capabilities. For example, we may enter into alliances with major pharmaceutical companies to jointly develop specific drug candidates and to jointly commercialize them if they are approved. In such alliances, we would expect our pharmaceutical collaborators to provide substantial capabilities in clinical development, regulatory affairs, marketing and sales. We may not be successful in entering into any such alliances on favorable terms. Even if we do succeed in securing such alliances, we may not be able to maintain them if, for example, development or approval of a drug candidate is delayed or sales of an approved drug are disappointing. Furthermore, any delay in entering into collaboration agreements could delay the development and commercialization of our drug candidates and reduce their competitiveness even if they reach the market. Any such delay related to our collaborations could adversely affect our business.
          In addition, we expect that we will need to enter into alliances with other companies to provide substantial additional cash for development and potential commercialization of our drug candidates. We entered into a collaboration agreement with Merck in September 2003, under which Merck may elect to pay a portion of the costs to develop and market certain drug candidates that we may initially develop based on information and materials provided by Merck. Merck is under no obligation to pay any of the development and commercialization costs for any of these drug candidates, and they may elect not to do so. For drug candidates from our Merck collaboration that Merck does not elect to fund, and for drug candidates we may develop outside of this collaboration, we expect to seek additional collaborations with other pharmaceutical companies to fund all or part of the costs of drug development and commercialization, such as the second collaboration and license agreement we entered into with Merck for ocular disease, including our current VEGF program. We may not, however, be able to enter into additional collaborations, and the terms of any collaboration agreement we do secure may not be favorable to us. If we are not successful in our efforts to enter into future collaboration arrangements with respect to a particular drug candidate, we may not have sufficient funds to develop this or any other drug candidate internally, or to bring any drug candidates to market. If we do not have sufficient funds to develop and bring our drug candidates to market, we will not be able to generate sales revenues from these drug candidates, and this will substantially harm our business.
          Our collaboration with Medtronic was established to pursue development of drug-device combinations incorporating RNAi therapeutics. We will engage in a joint technology development program for two years. After completion of this initial two-year period, we and Medtronic must jointly determine whether to initiate product development. Neither party is obligated to do so. We may not be successful in the joint technology development program, in initiating any product development under our collaboration with Medtronic, or in completing any such product development.
          Our collaboration with CFFT was established to research the potential development of RNAi-based therapeutics for the treatment of CF. Under this collaboration, CFFT will provide us with funding and scientific guidance to assist in our efforts to develop siRNAs for evaluation as potential therapeutic treatments for CF. The funding by CFFT is comprised of an up-front payment and milestone payments upon our successful achievement of certain scientific milestones, as defined by the agreement. We may not be successful in meeting the defined milestones and receiving the associated milestone payments.

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If any collaborator terminates or fails to perform its obligations under agreements with us, the development and commercialization of our drug candidates could be delayed or terminated.
          Our expected dependence on collaborators for capabilities and funding means that our business would be adversely affected if any collaborator terminates its collaboration agreement with us or fails to perform its obligations under that agreement. Our current or future collaborations, if any, may not be scientifically or commercially successful. Disputes may arise in the future with respect to the ownership of rights to technology or products developed with collaborators, which could have an adverse effect on our ability to develop and commercialize any affected product candidate.
          Our current collaborations allow, and we expect that any future collaborations will allow, either party to terminate the collaboration for a material breach by the other party. If a collaborator terminates its collaboration with us, for breach or otherwise, it would be difficult for us to attract new collaborators and could adversely affect how we are perceived in the business and financial communities. In addition, a collaborator could determine that it is in its financial interest to:
    pursue alternative technologies or develop alternative products, either on its own or jointly with others, that may be competitive with the products on which it is collaborating with us or which could affect its commitment to the collaboration with us;
 
    pursue higher-priority programs or change the focus of its development programs, which could affect the collaborator’s commitment to us; or
 
    if it has marketing rights, choose to devote fewer resources to the marketing of our product candidates, if any are approved for marketing, than it does for product candidates of its own development.
          If any of these occur, the development and commercialization of one or more drug candidates could be delayed, curtailed or terminated because we may not have sufficient financial resources or capabilities to continue such development and commercialization on our own.
We have very limited manufacturing experience or resources and we must incur significant costs to develop this expertise or rely on third parties to manufacture our products.
          We have very limited manufacturing experience. Our internal manufacturing experience is limited to small-scale production of non-GMP material for use in in vitro and in vivo experiments. In order to develop products, apply for regulatory approvals and commercialize our products, we will need to develop, contract for, or otherwise arrange for the necessary manufacturing capabilities. We may manufacture clinical trial materials ourselves or we may rely on others to manufacture the materials we will require for any clinical trials that we initiate. Only a limited number of manufacturers can supply synthetic RNAi. We have contracted with Dowpharma, a division of The Dow Chemical Company, for supply of certain amounts of material to meet our testing needs for toxicology and clinical testing. There are risks inherent in pharmaceutical manufacturing that could affect Dowpharma’s ability to meet our delivery time requirements or provide adequate amounts of material to meet our needs. Included in these risks are synthesis failures and contamination during the manufacturing process, both of which could result in unusable product and cause delays in our development process. The manufacturing process for any products that we may develop is an element of the FDA approval process and we will need to contract with manufacturers who can meet the FDA requirements on an ongoing basis. In addition, if we receive the necessary regulatory approval for any product candidate, we also expect to rely on third parties, including our collaborators, to produce materials required for commercial production. We may experience difficulty in obtaining adequate manufacturing capacity for our needs. If we are unable to obtain or maintain contract manufacturing for these product candidates, or to do so on commercially reasonable terms, we may not be able to successfully develop and commercialize our products.
          To the extent that we enter into manufacturing arrangements with third parties, we will depend on these third parties to perform their obligations in a timely manner and consistent with regulatory requirements. The failure of a third-party manufacturer to perform its obligations as expected could adversely affect our business in a number of ways, including:
    we may not be able to initiate or continue clinical trials of products that are under development;
 
    we may be delayed in submitting applications for regulatory approvals for our products;
 
    we may lose the cooperation of our collaborators;

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    we may be required to cease distribution or recall some or all batches of our products; and
 
    ultimately, we may not be able to meet commercial demands for our products.
          If a third-party manufacturer with whom we contract fails to perform its obligations, we may be forced to manufacture the materials ourselves, for which we may not have the capabilities or resources, or enter into an agreement with a different third-party manufacturer, which we may not be able to do with reasonable terms, if at all. In addition, if we are required to change manufacturers for any reason, we will be required to verify that the new manufacturer maintains facilities and procedures that comply with quality standards and with all applicable regulations and guidelines. The delays associated with the verification of a new manufacturer could negatively affect our ability to develop product candidates in a timely manner or within budget. Furthermore, a manufacturer may possess technology related to the manufacture of our product candidate that such manufacturer owns independently. This would increase our reliance on such manufacturer or require us to obtain a license from such manufacturer in order to have another third party manufacture our products.
We have no sales, marketing or distribution experience and expect to depend significantly on third parties who may not successfully commercialize our products.
          We have no sales, marketing or distribution experience. We expect to rely heavily on third parties to launch and market certain of our product candidates, if approved. We may have limited or no control over the sales, marketing and distribution activities of these third parties. Our future revenues may depend heavily on the success of the efforts of these third parties.
          To develop internal sales, distribution and marketing capabilities, we will have to invest significant amounts of financial and management resources. For products where we decide to perform sales, marketing and distribution functions ourselves, we could face a number of additional risks, including:
    we may not be able to attract and build a significant marketing or sales force;
 
    the cost of establishing a marketing or sales force may not be justifiable in light of the revenues generated by any particular product; and
 
    our direct sales and marketing efforts may not be successful.
Risks Related to Managing Our Operations
If we are unable to attract and retain qualified key management and scientists, staff consultants and advisors, our ability to implement our business plan may be adversely affected.
          We are highly dependent upon our senior management and scientific staff. The loss of the service of any of the members of our senior management, including Dr. John Maraganore, our President and Chief Executive Officer, may significantly delay or prevent the achievement of product development and other business objectives. Our employment agreements with our key personnel are terminable without notice. We do not carry key man life insurance on any of our key employees.
          Although we have generally been successful in our recruiting efforts, we face intense competition for qualified individuals from numerous pharmaceutical and biotechnology companies, universities, governmental entities and other research institutions. We may be unable to attract and retain suitably qualified individuals, and our failure to do so could have an adverse effect on our ability to implement our business plan.
We may have difficulty managing our growth and expanding our operations successfully as we seek to evolve from a company primarily involved in discovery and preclinical testing into one that develops and commercializes drugs.
          Since we commenced operations in 2002, we have grown rapidly to over 75 full time employees, with offices and laboratory space in both Cambridge, Massachusetts and Kulmbach, Germany. This rapid and substantial growth, and the geographical separation of our sites, has placed a strain on our administrative and operational infrastructure, and we anticipate that our continued growth will have a similar impact. If drug candidates we develop enter and advance through clinical trials, we will need to expand our development, regulatory, manufacturing, marketing and sales capabilities or contract with other organizations to provide these

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capabilities for us. As our operations expand, we expect that we will need to manage additional relationships with various collaborators, suppliers and other organizations. Our ability to manage our operations and growth will require us to continue to improve our operational, financial and management controls, reporting systems and procedures in at least two different countries. We may not be able to implement improvements to our management information and control systems in an efficient or timely manner and may discover deficiencies in existing systems and controls.
If we are unable to manage the challenges associated with our international operations, the growth of our business could be limited.
          In addition to our operations in Cambridge, Massachusetts, we operate an office and laboratory in Kulmbach, Germany. We are subject to a number of risks and challenges that specifically relate to these international operations. Our international operations may not be successful if we are unable to meet and overcome these challenges, which could limit the growth of our business and may have an adverse effect on our business and operating results. These risks include:
    fluctuations in foreign currency exchange rates that may increase the U.S. dollar cost of our international operations;
 
    difficulty managing operations in multiple locations, which could adversely affect the progress of our product candidate development program and business prospects;
 
    local regulations that may restrict or impair our ability to conduct biotechnology-based research and development;
 
    foreign protectionist laws and business practices that favor local competition; and
 
    failure of local laws to provide the same degree of protection against infringement of our intellectual property, which could adversely affect our ability to develop product candidates or reduce future product or royalty revenues, if any, from product candidates we may develop.
Risks Related to Our Industry
Risks Related to Development, Clinical Testing and Regulatory Approval of Our Drug Candidates
Any drug candidates we develop may fail in development or be delayed to a point where they do not become commercially viable.
          Preclinical testing and clinical trials of new drug candidates are lengthy and expensive and the historical failure rate for drug candidates is high. We may not be able to advance any product candidates into clinical trials. Even if we do successfully enter into clinical studies, the results from preclinical testing of a drug candidate may not predict the results that will be obtained in human clinical trials. We, the FDA or other applicable regulatory authorities may suspend clinical trials of a drug candidate at any time if we or they believe the subjects or patients participating in such trials are being exposed to unacceptable health risks, or for other reasons. Among other reasons, adverse side effects of a drug candidate on subjects or patients in a clinical trial could result in the FDA or foreign regulatory authorities suspending or terminating the trial and refusing to approve a particular drug candidate for any or all indications of use.
          Clinical trials of a new drug candidate require the enrollment of a sufficient number of patients, including patients who are suffering from the disease the drug candidate is intended to treat and who meet other eligibility criteria. Rates of patient enrollment are affected by many factors, including the size of the patient population, the nature of the protocol, the proximity of patients to clinical sites, the availability of effective treatments for the relevant disease and the eligibility criteria for the clinical trial. Delays in patient enrollment can result in increased costs and longer development times.
          Clinical trials also require the review and oversight of institutional review boards, referred to as IRBs, which approve and continually review clinical investigations and protect the rights and welfare of human subjects. Inability to obtain or delay in obtaining IRB approval can prevent or delay the initiation and completion of clinical trials, and the FDA may decide not to consider any data or information derived from a clinical investigation not subject to initial and continuing IRB review and approval in support of a marketing application.
          Our drug candidates that we develop may encounter problems during clinical trials that will cause us or regulatory authorities to delay or suspend these trials, or that will delay the analysis of data from these trials. If we experience any such problems, we may not have the financial resources to continue development of the drug candidate that is affected, or development of any of our other

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drug candidates. We may also lose, or be unable to enter into, collaborative arrangements for the affected drug candidate and for other drug candidates we are developing.
          Delays in clinical trials could reduce the commercial viability of our drug candidates. Any of the following could delay our clinical trials:
    discussions with the FDA or comparable foreign authorities regarding the scope or design of our clinical trials;
 
    problems in engaging IRBs to oversee trials or problems in obtaining IRB approval of studies;
 
    delays in enrolling patients and volunteers into clinical trials;
 
    high drop-out rates for patients and volunteers in clinical trials;
 
    negative results of clinical trials;
 
    inadequate supply or quality of drug candidate materials or other materials necessary for the conduct of our clinical trials;
 
    serious and unexpected drug-related side effects experienced by participants in our clinical trials; or
 
    unfavorable FDA inspection and review of a clinical trial site or records of any clinical or preclinical investigation.
The FDA approval process may be delayed for any drugs we develop that require the use of specialized drug delivery devices.
          Some drug candidates that we develop may need to be administered using specialized drug delivery devices. We believe that any product candidate we develop for PD, or other central nervous system diseases will need to be administered using such a device. For neurodegenerative diseases, we have entered into a collaboration agreement with Medtronic to pursue potential development of drug-device combinations incorporating RNAi therapeutics. We may not achieve successful development results under this collaboration and may need to seek other collaboration partners to develop alternative drug delivery systems, or utilize existing drug delivery systems, for the delivery of Direct RNAi therapeutics for these diseases. While we expect to rely on drug delivery systems that have been approved by the FDA or other regulatory agencies to deliver drugs like ours to similar physiological sites, we, or our collaborator, may need to modify the design or labeling of such delivery device for some products we may develop. In such an event, the FDA may regulate the product as a combination product or require additional approvals or clearances for the modified delivery device. Further, to the extent the specialized delivery device is owned by another company, we would need that company’s cooperation to implement the necessary changes to the device, or its labeling, and to obtain any additional approvals or clearances. In cases where we do not have an ongoing collaboration with the company that makes the device, obtaining such additional approvals or clearances and the cooperation of such other company could significantly delay and increase the cost of obtaining marketing approval, which could reduce the commercial viability of our drug candidate. In summary, we may be unable to find, or experience delays in finding, suitable drug delivery systems to administer Direct RNAi therapeutics, which could negatively affect our ability to successfully commercialize certain Direct RNAi therapeutics.
We may be unable to obtain U.S. or foreign regulatory approval and, as a result, be unable to commercialize our drug candidates.
          Our drug candidates are subject to extensive governmental regulations relating to development, clinical trials, manufacturing and commercialization. Rigorous preclinical testing and clinical trials and an extensive regulatory approval process are required to be successfully completed in the United States and in many foreign jurisdictions before a new drug can be sold. Satisfaction of these and other regulatory requirements is costly, time consuming, uncertain and subject to unanticipated delays. It is possible that none of the drug candidates we may develop will obtain the appropriate regulatory approvals necessary for us or our collaborators to begin selling them.
          We have no experience in conducting and managing the clinical trials necessary to obtain regulatory approvals, including approval by the FDA. The time required to obtain FDA and other approvals is unpredictable but typically exceeds five years following the commencement of clinical trials, depending upon the complexity of the drug candidate. Any analysis we perform of data from preclinical and clinical activities is subject to confirmation and interpretation by regulatory authorities, which could delay,

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limit or prevent regulatory approval. We may also encounter unexpected delays or increased costs due to new government regulations, for example, from future legislation or administrative action, or from changes in FDA policy during the period of product development, clinical trials and FDA regulatory review.
          Because the drugs we are intending to develop may represent a new class of drug, the FDA has not yet established any definitive policies, practices or guidelines in relation to these drugs. While we expect any AMD, RSV, PD, SCI, CF or pandemic flu product candidates we develop will be regulated as a new drug under the Federal Food, Drug, and Cosmetic Act, the FDA could decide to regulate them or other products we may develop as biologics under the Public Health Service Act. The lack of policies, practices or guidelines may hinder or slow review by the FDA of any regulatory filings that we may submit. Moreover, the FDA may respond to these submissions by defining requirements we may not have anticipated. Such responses could lead to significant delays in the clinical development of our product candidates. In addition, because there are approved treatments for AMD, RSV and PD, in order to receive regulatory approval, we will need to demonstrate through clinical trials that the product candidates we develop to treat these diseases, if any, are not only safe and effective, but safer or more effective than existing products.
          Any delay or failure in obtaining required approvals could have a material adverse effect on our ability to generate revenues from the particular drug candidate. Furthermore, any regulatory approval to market a product may be subject to limitations on the indicated uses for which we may market the product. These limitations may limit the size of the market for the product.
          We are also subject to numerous foreign regulatory requirements governing the conduct of clinical trials, manufacturing and marketing authorization, pricing and third-party reimbursement. The foreign regulatory approval process includes all of the risks associated with FDA approval described above as well as risks attributable to the satisfaction of local regulations in foreign jurisdictions. Approval by the FDA does not assure approval by regulatory authorities outside the United States.
Even if we obtain regulatory approvals, our marketed drugs will be subject to ongoing regulatory review. If we fail to comply with continuing U.S. and foreign regulations, we could lose our approvals to market drugs and our business would be seriously harmed.
          Following any initial regulatory approval of any drugs we may develop, we will also be subject to continuing regulatory review, including the review of adverse drug experiences and clinical results that are reported after our drug products are made commercially available. This would include results from any post-marketing tests or vigilance required as a condition of approval. The manufacturer and manufacturing facilities we use to make any of our drug candidates will also be subject to periodic review and inspection by the FDA. The discovery of any previously unknown problems with the product, manufacturer or facility may result in restrictions on the drug or manufacturer or facility, including withdrawal of the drug from the market. We do not have, and currently do not intend to develop, the ability to manufacture material for our clinical trials or on a commercial scale. We may manufacture clinical trial materials or we may contract a third-party to manufacture these materials for us. Reliance on third-party manufacturers entails risks to which we would not be subject if we manufactured products ourselves, including reliance on the third-party manufacturer for regulatory compliance. Our product promotion and advertising is also subject to regulatory requirements and continuing FDA review.
          If we fail to comply with applicable continuing regulatory requirements, we may be subject to fines, suspension or withdrawal of regulatory approval, product recalls and seizures, operating restrictions and criminal prosecutions.
Even if we receive regulatory approval to market our product candidates, the market may not be receptive to our product candidates upon their commercial introduction, which will prevent us from becoming profitable.
          The product candidates that we are developing are based upon new technologies or therapeutic approaches. Key participants in pharmaceutical marketplaces, such as physicians, third-party payors and consumers, may not accept a product intended to improve therapeutic results based on RNAi technology. As a result, it may be more difficult for us to convince the medical community and third-party payors to accept and use our products.
          Other factors that we believe will materially affect market acceptance of our product candidates include:
    the timing of our receipt of any marketing approvals, the terms of any approvals and the countries in which approvals are obtained;
 
    the safety, efficacy and ease of administration;

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    the willingness of patients to accept relatively new routes of administration such as injection into the eye;
 
    the success of our physician education programs;
 
    the availability of government and third-party payor reimbursement;
 
    the pricing of our products, particularly as compared to alternative treatments; and
 
    the availability of alternative effective treatments for the diseases that product candidates we develop are intended to treat.
If we or our collaborators, manufacturers or service providers fail to comply with regulatory laws and regulations, we or they could be subject to enforcement actions, which could affect our ability to market and sell our products and may harm our reputation.
          If we or our collaborators, manufacturers or service providers fail to comply with applicable federal, state or foreign laws or regulations, we could be subject to enforcement actions, which could affect our ability to develop, market and sell our products under development successfully and could harm our reputation and lead to reduced acceptance of our products by the market. These enforcement actions include:
    warning letters;
 
    recalls or public notification or medical product safety alerts;
 
    restrictions on, or prohibitions against, marketing our products;
 
    restrictions on importation of our products;
 
    suspension of review or refusal to approve pending applications;
 
    suspension or withdrawal of product approvals;
 
    product seizures;
 
    injunctions; and
 
    civil and criminal penalties and fines.
Any drugs we develop may become subject to unfavorable pricing regulations, third-party reimbursement practices or healthcare reform initiatives, thereby harming our business.
          The regulations that govern marketing approvals, pricing and reimbursement for new drugs vary widely from country to country. Some countries require approval of the sale price of a drug before it can be marketed. In many countries, the pricing review period begins after marketing or product licensing approval is granted. In some foreign markets, prescription pharmaceutical pricing remains subject to continuing governmental control even after initial approval is granted. Although we intend to monitor these regulations, our programs are currently in the early stages of development and we will not be able to assess the impact of price regulations for a number of years. As a result, we might obtain regulatory approval for a product in a particular country, but then be subject to price regulations that delay our commercial launch of the product and negatively impact the revenues we are able to generate from the sale of the product in that country.
          Our ability to commercialize any products successfully also will depend in part on the extent to which reimbursement for these products and related treatments will be available from government health administration authorities, private health insurers and other organizations. Even if we succeed in bringing one or more products to the market, these products may not be considered cost-effective, and the amount reimbursed for any products may be insufficient to allow us to sell our products on a competitive basis. Because our programs are in the early stages of development, we are unable at this time to determine their cost effectiveness and the

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level or method of reimbursement. Increasingly, the third-party payors who reimburse patients, such as government and private insurance plans, are requiring that drug companies provide them with predetermined discounts from list prices, and are challenging the prices charged for medical products. If the price we are able to charge for any products we develop is inadequate in light of our development and other costs, our profitability could be adversely affected.
          We currently expect that any drugs we develop may need to be administered under the supervision of a physician. Under currently applicable law, drugs that are not usually self-administered may be eligible for coverage by the Medicare program if:
    they are incident to a physician’s services;
 
    they are “reasonable and necessary” for the diagnosis or treatment of the illness or injury for which they are administered according to accepted standard of medical practice;
 
    they are not excluded as immunizations; and
 
    they have been approved by the FDA.
          There may be significant delays in obtaining coverage for newly-approved drugs, and coverage may be more limited than the purposes for which the drug is approved by the FDA. Moreover, eligibility for coverage does not imply that any drug will be reimbursed in all cases or at a rate that covers our costs, including research, development, manufacture, sale and distribution. Interim payments for new drugs, if applicable, may also not be sufficient to cover our costs and may not be made permanent. Reimbursement may be based on payments allowed for lower-cost drugs that are already reimbursed, may be incorporated into existing payments for other services and may reflect budgetary constraints or imperfections in Medicare data. Net prices for drugs may be reduced by mandatory discounts or rebates required by government health care programs or private payors and by any future relaxation of laws that presently restrict imports of drugs from countries where they may be sold at lower prices than in the United States. Third party payors often rely upon Medicare coverage policy and payment limitations in setting their own reimbursement rates. Our inability to promptly obtain coverage and profitable reimbursement rates from both government-funded and private payors for new drugs that we develop could have a material adverse effect on our operating results, our ability to raise capital needed to commercialize products, and our overall financial condition.
          We believe that the efforts of governments and third-party payors to contain or reduce the cost of healthcare will continue to affect the business and financial condition of pharmaceutical and biopharmaceutical companies. A number of legislative and regulatory proposals to change the healthcare system in the United States and other major healthcare markets have been proposed in recent years. These proposals have included prescription drug benefit legislation recently enacted in the United States and healthcare reform legislation recently enacted by certain states. Further federal and state legislative and regulatory developments are possible and we expect ongoing initiatives in the United States to increase pressure on drug pricing. Such reforms could have an adverse effect on anticipated revenues from drug candidates that we may successfully develop.
          Another development that may affect the pricing of drugs is Congressional action regarding drug reimportation into the United States. The Medicare Prescription Drug Plan legislation, which became law in December 2003, requires the Secretary of Health and Human Services to promulgate regulations for drug reimportation from Canada into the United States under some circumstances, including when the drugs are sold at a lower price than in the United States. The Secretary retains the discretion not to implement a drug reimportation plan if he finds that the benefits do not outweigh the cost. Proponents of drug reimportation may attempt to pass legislation that would directly allow reimportation under certain circumstances. If legislation or regulations were passed allowing the reimportation of drugs, they could decrease the price we receive for any products that we may develop, negatively affecting our anticipated revenues and prospects for profitability.
          Some states and localities have established drug importation programs for their citizens. So far, these programs have not led to a large proportion of prescription orders to be placed for foreign purchase. The FDA has warned that importing drugs is illegal and in December 2004 began to take action to halt the use of these programs by filing a civil complaint against an importer of foreign prescription drugs. If such programs were to become more substantial and were not to be encumbered by the federal government, they could also decrease the price we receive for any products that we may develop, negatively affecting our anticipated revenues and prospects for profitability.
There is a substantial risk of product liability claims in our business. If we are unable to obtain sufficient insurance, a product liability claim against us could adversely affect our business.

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          Our business exposes us to significant potential product liability risks that are inherent in the development, manufacturing and marketing of human therapeutic products. Product liability claims could delay or prevent completion of our clinical development programs. If we succeed in marketing products, such claims could result in an FDA investigation of the safety and effectiveness of our products, our manufacturing processes and facilities or our marketing programs, and potentially a recall of our products or more serious enforcement action, or limitations on the indications for which they may be used, or suspension or withdrawal of approval. We currently do not have any product liability insurance, but plan to obtain such insurance at appropriate levels prior to initiating clinical trials and at higher levels prior to marketing any of our drug candidates. Any insurance we obtain may not provide sufficient coverage against potential liabilities. Furthermore, clinical trial and product liability insurance is becoming increasingly expensive. As a result, we may be unable to obtain sufficient insurance at a reasonable cost to protect us against losses caused by product liability claims that could have a material adverse effect on our business.
If we do not comply with laws regulating the protection of the environment and health and human safety, our business could be adversely affected.
          Our research and development involves the use of hazardous materials, chemicals and various radioactive compounds. We maintain quantities of various flammable and toxic chemicals in our facilities in Cambridge and Germany that are required for our research and development activities. We believe our procedures for storing, handling and disposing these materials in our Cambridge facility comply with the relevant guidelines of the City of Cambridge and the Commonwealth of Massachusetts and the procedures we employ in our German facility comply with the standards mandated by applicable German laws and guidelines. Although we believe that our safety procedures for handling and disposing of these materials comply with the standards mandated by applicable regulations, the risk of accidental contamination or injury from these materials cannot be eliminated. If an accident occurs, we could be held liable for resulting damages, which could be substantial. We are also subject to numerous environmental, health and workplace safety laws and regulations, including those governing laboratory procedures, exposure to blood-borne pathogens and the handling of biohazardous materials.
          Although we maintain workers’ compensation insurance to cover us for costs and expenses we may incur due to injuries to our employees resulting from the use of these materials, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for environmental liability or toxic tort claims that may be asserted against us in connection with our storage or disposal of biological, hazardous or radioactive materials. Additional federal, state and local laws and regulations affecting our operations may be adopted in the future. We may incur substantial costs to comply with, and substantial fines or penalties if we violate any of these laws or regulations.
Risks Related to Competition
The pharmaceutical market is intensely competitive. If we are unable to compete effectively with existing drugs, new treatment methods and new technologies, we may be unable to commercialize any drugs that we develop.
          The pharmaceutical market is intensely competitive and rapidly changing. Many large pharmaceutical and biotechnology companies, academic institutions, governmental agencies and other public and private research organizations are pursuing the development of novel drugs for the same diseases that we are targeting or expect to target. Many of our competitors have:
    much greater financial, technical and human resources than we have at every stage of the discovery, development, manufacture and commercialization of products;
 
    more extensive experience in preclinical testing, conducting clinical trials, obtaining regulatory approvals, and in manufacturing and marketing pharmaceutical products;
 
    product candidates that are based on previously tested or accepted technologies;
 
    products that have been approved or are in late stages of development; and
 
    collaborative arrangements in our target markets with leading companies and research institutions.
          We will face intense competition from drugs that have already been approved and accepted by the medical community for the treatment of the conditions for which we may develop drugs. We also expect to face competition from new drugs that enter the

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market. We believe a significant number of drugs are currently under development, and may become commercially available in the future, for the treatment of conditions for which we may try to develop drugs. For instance, we are currently evaluating RNAi therapeutics to suppress VEGF gene activity as a potential drug candidate for the treatment of wet AMD and we are currently evaluating the potential of RNAi therapeutics for the treatment of RSV, PD and CF. Two drugs, Visudyne and Macugen, are already marketed for the treatment of wet AMD, Virazole is currently marketed for the treatment of certain RSV patients, numerous drugs are currently marketed for the treatment of PD and two drugs, TOBI and Pulmozyme, are currently marketed for the treatment of CF. In addition, we are aware of a number of experimental drugs for the treatment of wet AMD that, unlike our product candidate, are in advanced stages of clinical development. These experimental drugs include Lucentis, which is being developed by Genentech, Inc. in collaboration with Novartis for which positive phase III clinical trial data were announced in May 2005. Lucentis, and potentially others of these drug candidates may be approved for marketing before our product candidate receives approval and may yield clinical trial results that may be hard to improve upon. In addition, our competitors’ products may be more effective, or marketed and sold more effectively, than any products we develop.
          If we successfully develop drug candidates, and obtain approval for them, we will face competition based on many different factors, including:
    the safety and effectiveness of our products;
 
    the ease with which our products can be administered and the extent to which patients accept relatively new routes of administration such as injection into the eye;
 
    the timing and scope of regulatory approvals for these products;
 
    the availability and cost of manufacturing, marketing and sales capabilities;
 
    price;
 
    reimbursement coverage; and
 
    patent position.
          Our competitors may develop or commercialize products with significant advantages over any products we develop based on any of the factors listed above or on other factors. Our competitors may therefore be more successful in commercializing their products than we are, which could adversely affect our competitive position and business. Competitive products may make any products we develop obsolete or noncompetitive before we can recover the expenses of developing and commercializing our drug candidates. Furthermore, we also face competition from existing and new treatment methods that reduce or eliminate the need for drugs, such as the use of advanced medical devices. The development of new medical devices or other treatment methods for the diseases we are targeting could make our drug candidates noncompetitive, obsolete or uneconomical.
We face competition from other companies that are working to develop novel drugs using technology similar to ours. If these companies develop drugs more rapidly than we do or their technologies are more effective, our ability to successfully commercialize drugs will be adversely affected.
          In addition to the competition we face from competing drugs in general, we also face competition from other companies working to develop novel drugs using technology that competes more directly with our own. We are aware of several other companies that are working in the field of RNAi, including Sirna Therapeutics, Inc., Acuity Pharmaceuticals, Inc., Nucleonics, Inc., and CytRx Corporation. In addition, we granted licenses to Isis, GeneCare Research Institute Co., Ltd., Benitec Ltd, Nastech Pharmaceutical Company Inc. as well as others under which these companies may independently develop RNAi therapeutics against a limited number of targets. Any of these companies may develop its RNAi technology more rapidly and more effectively than us.
          We also compete with companies working to develop antisense-based drugs. Like RNAi product candidates, antisense drugs target mRNAs in order to suppress the activity of specific genes. Isis is currently marketing an antisense drug and has several antisense drug candidates in clinical trials, and another company, Genta Inc., has multiple antisense drug candidates in late-stage clinical trials. The development of antisense drugs is more advanced than that of RNAi therapeutics and antisense technology may become the preferred technology for drugs that target mRNAs to silence specific genes.

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Risks Related to Patents, Licenses and Trade Secrets
If we are not able to obtain and enforce patent protection for our discoveries, our ability to develop and commercialize our product candidates will be harmed.
          Our success depends, in part, on our ability to protect proprietary methods and technologies that we develop under the patent and other intellectual property laws of the United States and other countries, so that we can prevent others from unlawfully using our inventions and proprietary information. However, we may not hold proprietary rights to some patents required for us to commercialize our proposed products. Because certain U.S. patent applications are confidential until patents issue, such as applications filed prior to November 29, 2000, or applications filed after such date which will not be filed in foreign countries, third parties may have filed patent applications for technology covered by our pending patent applications without our being aware of those applications, and our patent applications may not have priority over those applications. For this and other reasons, we may be unable to secure desired patent rights, thereby losing desired exclusivity. Further, we may be required to obtain licenses under third-party patents to market our proposed products or conduct our research and development or other activities. If licenses are not available to us on acceptable terms, we will not be able to market the affected products or conduct the desired activities.
          Our strategy depends on our ability to rapidly identify and seek patent protection for our discoveries. In addition, we will rely on third-party collaborators to file patent applications relating to proprietary technology that we develop jointly during certain collaborations. The process of obtaining patent protection is expensive and time-consuming. If our present or future collaborators fail to file and prosecute all necessary and desirable patent applications at a reasonable cost and in a timely manner, our business will be adversely affected. Despite our efforts and the efforts of our collaborators to protect our proprietary rights, unauthorized parties may be able to obtain and use information that we regard as proprietary. The mere issuance of a patent does not guarantee that it is valid or enforceable, so even if we obtain patents, they may not be valid or enforceable against third parties.
          Our pending patent applications may not result in issued patents. The patent position of pharmaceutical or biotechnology companies, including ours, is generally uncertain and involves complex legal and factual considerations. The standards that the United States Patent and Trademark Office and its foreign counterparts use to grant patents are not always applied predictably or uniformly and can change. There is also no uniform, worldwide policy regarding the subject matter and scope of claims granted or allowable in pharmaceutical or biotechnology patents. Accordingly, we do not know the degree of future protection for our proprietary rights or the breadth of claims that will be allowed in any patents issued to us or to others.
          We also rely on trade secrets, know-how and technology, which are not protected by patents, to maintain our competitive position. If any trade secret, know-how or other technology not protected by a patent were to be disclosed to or independently developed by a competitor, our business and financial condition could be materially adversely affected.
We license patent rights from third party owners. If such owners do not properly maintain or enforce the patents underlying such licenses, our competitive position and business prospects will be harmed.
          We are a party to a number of licenses that give us rights to third party intellectual property that is necessary or useful for our business. In particular, we have obtained licenses from Isis, Hybridon, Carnegie Institution of Washington, Cancer Research Technology Limited, the Massachusetts Institute of Technology, the Whitehead Institute, Garching Innovation GmbH, representing the Max Planck Gesellschaft zur Förderung der Wissenschaften e.V., referred to as the Max Planck organization, Stanford University, Cold Spring Harbor Laboratory and the University of South Alabama. We also intend to enter into additional licenses to third party intellectual property in the future.
          Our success will depend in part on the ability of our licensors to obtain, maintain and enforce patent protection for our licensed intellectual property, in particular, those patents to which we have secured exclusive rights. Our licensors may not successfully prosecute the patent applications to which we are licensed. Even if patents issue in respect of these patent applications, our licensors may fail to maintain these patents, may determine not to pursue litigation against other companies that are infringing these patents, or may pursue such litigation less aggressively than we would. Without protection for the intellectual property we license, other companies might be able to offer substantially identical products for sale, which could adversely affect our competitive business position and harm our business prospects.
Two patents from one of our key patent families, the so-called Kreutzer-Limmer patent series of patents are the subjects of

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opposition proceedings in the European Patent Office and the Australian Patent Office, which could result in the invalidation of these patents.
          A German Utility Model covering RNAi composition was registered in 2003, and a patent covering RNAi compositions and their use was granted by the European Patent Office, or EPO, in 2002, in South Africa in 2003 and accepted for grant in Australia in 2004. Related patent applications are pending in other countries, including the United States. A German Utility Model is a form of patent that is directed only to physical matter, such as medicines, and does not cover methods. The maximum period of protection afforded by the German Utility Model ends in 2010. After the grant by the EPO of the Kreutzer-Limmer patent, published under publication number EP 1144623B9, several oppositions to the issuance of the European patent were filed with the EPO, a practice that is allowed under the European Patent Convention. Each of the oppositions raises a number of grounds for the invalidation of the patent, including the use of disclaimer practice. The EPO opposition division in charge of the opposition proceedings may agree with one or more of the grounds and could revoke the patent in whole or restrict the scope of the claims. In May 2005 the EPO granted us a new patent covering short interfering RNAs, or siRNAs, including therapeutic compositions, methods, and uses of siRNAs and derivatives with a length between 15 and 49 nucleotides. This patent was published on June 8, 2005 under publication number EP 1214945. However, this patent may also become the subject of opposition, which could result in its invalidation. It may be several years before the outcome of any opposition proceeding is decided by the EPO.
          In addition, the Enlarged Board of Appeal at the EPO rendered a decision in an unrelated case covering what is known as “disclaimer practice”. With a disclaimer, a patent applicant gives up, or disclaims, part of the originally claimed invention in a patent application in order to overcome prior art and adds a limitation to the claims which may have no basis in the original disclosure. The Enlarged Board determined that disclaimer practice is allowed under the European Patent Convention under a defined set of circumstances. It now has to be determined as part of the opposition proceedings regarding the Kreutzer-Limmer patent whether the use of a disclaimer during the prosecution of this case falls within one of the allowable circumstances. Determination by the EPO opposition division that the use of the disclaimer in this case does not fall under one of the allowed circumstances could result in the invalidation of the Kreutzer-Limmer patent. Even if the EPO opposition division determines that the use of a disclaimer is permissible, the Kreutzer-Limmer patent would remain subject to the other issues raised in the opposition. If the Kreutzer-Limmer patent is invalidated or limited for any reason, other companies will be better able to develop products that compete with ours, which could adversely affect our competitive business position, business prospects and financial condition.
          Furthermore, one party has given notice to the Australian Patent Office, IP Australia, on March 9, 2005, that it opposes the grant of AU 778474. This Australian patent derives from the same parent international patent application that gave rise to EP 1144623B9, and is of similar, but not the same, scope. In particular, its claims do not rely upon a disclaimer. The opposing party recently furnished the grounds for its opposition, and has until September 9, 2005, to submit documents in support of the stated grounds. Like the proceedings in the EPO, these proceedings may take several years before an outcome becomes final.
Other companies or organizations may assert patent rights that prevent us from developing and commercializing our products.
          RNA interference is a relatively new scientific field that has generated many different patent applications from organizations and individuals seeking to obtain important patents in the field. These applications claim many different methods, compositions and processes relating to the discovery, development and commercialization of RNAi therapeutics. Because the field is so new, very few of these patent applications have been fully processed by government patent offices around the world, and there is a great deal of uncertainty about which patents will issue, when, to whom, and with what claims. It is likely that there will be significant litigation and other proceedings, such as interference and opposition proceedings in various patent offices, relating to patent rights in the RNAi field. Others may attempt to invalidate our intellectual property rights. Even if our rights are not directly challenged, disputes among third parties could lead to the weakening or invalidation of our intellectual property rights.
          In addition, there are many issued and pending patents that claim aspects of oligonucleotide chemistry that we may need to apply to our siRNA drug candidates. There are also many issued patents that claim genes or portions of genes that may be relevant for siRNA drugs we wish to develop.
          Thus, it is possible that one or more organizations will hold patent rights to which we will need a license. If those organizations refuse to grant us a license to such patent rights on reasonable terms, we will not be able to market products or perform research and development or other activities covered by these patents.
If we become involved in patent litigation or other proceedings related to a determination of rights, we could incur substantial costs

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and expenses, substantial liability for damages or be required to stop our product development and commercialization efforts.
          A third party may sue us for infringing its patent rights. Likewise, we may need to resort to litigation to enforce a patent issued or licensed to us or to determine the scope and validity of third-party proprietary rights. In addition, a third party may claim that we have improperly obtained or used its confidential or proprietary information. Furthermore, in connection with a license agreement, we have agreed to indemnify the licensor for costs incurred in connection with litigation relating to intellectual property rights. The cost to us of any litigation or other proceeding relating to intellectual property rights, even if resolved in our favor, could be substantial, and the litigation would divert our management’s efforts. Some of our competitors may be able to sustain the costs of complex patent litigation more effectively than we can because they have substantially greater resources. Uncertainties resulting from the initiation and continuation of any litigation could limit our ability to continue our operations.
          If any parties successfully claim that our creation or use of proprietary technologies infringes upon their intellectual property rights, we might be forced to pay damages, potentially including treble damages, if we are found to have willfully infringed on such parties’ patent rights. In addition to any damages we might have to pay, a court could require us to stop the infringing activity or obtain a license. Any license required under any patent may not be made available on commercially acceptable terms, if at all. In addition, such licenses are likely to be non-exclusive and, therefore, our competitors may have access to the same technology licensed to us. If we fail to obtain a required license and are unable to design around a patent, we may be unable to effectively market some of our technology and products, which could limit our ability to generate revenues or achieve profitability and possibly prevent us from generating revenue sufficient to sustain our operations. Moreover, we expect that a number of our collaborations will provide that royalties payable to us for licenses to our intellectual property may be offset by amounts paid by our collaborators to third parties who have competing or superior intellectual property positions in the relevant fields, which could result in significant reductions in our revenues from products developed through collaborations.
If we fail to comply with our obligations under any licenses or related agreements, we could lose license rights that are necessary for developing and protecting our RNAi technology and any related product candidates that we develop, or we could lose certain exclusive rights to grant sublicenses.
          Our current licenses impose, and any future licenses we enter into are likely to impose, various development, commercialization, funding, royalty, diligence, sublicensing, insurance and other obligations on us. If we breach any of these obligations, the licensor may have the right to terminate the license or render the license non-exclusive, which could result in us being unable to develop, manufacture and sell products that are covered by the licensed technology or enable a competitor to gain access to the licensed technology. In addition, while we cannot currently determine the amount of the royalty obligations we will be required to pay on sales of future products, if any, the amounts may be significant. The amount of our future royalty obligations will depend on the technology and intellectual property we use in products that we successfully develop and commercialize, if any. Therefore, even if we successfully develop and commercialize products, we may be unable to achieve or maintain profitability.
          For two important pending patent applications, owned in part or solely by the Max Planck organization of Germany, our amended licenses with Garching, a related entity to Max Planck require us to maintain a minimum level of employees in Germany. If we fail to comply with this condition, the owners of the patent applications that are the subject of these licenses may have the right to grant a similar license to one other company. We regard these pending patent applications as significant because they relate to important aspects of the structure of siRNA molecules and their use as therapeutics.
          We have an agreement with Isis under which we were granted licenses to over 150 patents and patent applications that we believe will be useful to the development of RNAi therapeutics. If, by January 1, 2008, we or a collaborator have not completed the studies required for an investigational new drug application filing or similar foreign filing for at least one product candidate involving these patent rights, Isis would have the right to grant licenses to third parties for these patents and patent applications, thereby making our rights non-exclusive.
Confidentiality agreements with employees and others may not adequately prevent disclosure of trade secrets and other proprietary information.
          In order to protect our proprietary technology and processes, we rely in part on confidentiality agreements with our collaborators, employees, consultants, outside scientific collaborators and sponsored researchers and other advisors. These agreements may not effectively prevent disclosure of confidential information and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. In addition, others may independently discover trade secrets and proprietary

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information, and in such cases we could not assert any trade secret rights against such party. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our proprietary rights, and failure to obtain or maintain trade secret protection could adversely affect our competitive business position.
Risks Related to Our Common Stock
If our stock price fluctuates, purchasers of our common stock could incur substantial losses.
          The market price of our common stock may fluctuate significantly in response to factors that are beyond our control. The stock market in general has recently experienced extreme price and volume fluctuations. The market prices of securities of pharmaceutical and biotechnology companies have been extremely volatile, and have experienced fluctuations that often have been unrelated or disproportionate to the operating performance of these companies. These broad market fluctuations could result in extreme fluctuations in the price of our common stock, which could cause purchasers of our common stock to incur substantial losses.
We may incur significant costs from class action litigation due to our expected stock volatility.
          Our stock price may fluctuate for many reasons, including as a result of public announcements regarding the progress of our development efforts, the addition or departure of our key personnel, variations in our quarterly operating results and changes in market valuations of pharmaceutical and biotechnology companies. Recently, when the market price of a stock has been volatile as our stock price may be, holders of that stock have occasionally brought securities class action litigation against the company that issued the stock. If any of our stockholders were to bring a lawsuit of this type against us, even if the lawsuit is without merit, we could incur substantial costs defending the lawsuit. The lawsuit could also divert the time and attention of our management.
If there are substantial sales of our common stock, the price of our common stock could decline.
          If our existing stockholders sell a large number of shares of our common stock or the public market perceives that existing stockholders might sell shares of common stock, the market price of our common stock could decline significantly.
          The holders of approximately 11.4 million shares of our common stock have rights to require us to file registration statements under the Securities Act or to include their shares in registration statements that we may file in the future for ourselves or other stockholders.
Insiders have substantial influence over Alnylam and could delay or prevent a change in corporate control.
          Our directors and executive officers, together with their affiliates, beneficially own, in the aggregate, approximately 22% of our outstanding common stock as of June 30, 2005. As a result, these stockholders, if acting together, may have the ability to significantly affect the outcome of matters submitted to our stockholders for approval, including the election of directors and any merger, consolidation or sale of all or substantially all of our assets. Accordingly, this concentration of ownership may harm the market price of our common stock by:
    delaying, deferring or preventing a change in control of our company;
 
    impeding a merger, consolidation, takeover or other business combination involving our company; or
 
    discouraging a potential acquirer from making a tender offer or otherwise attempting to obtain control of our company.
Anti-takeover provisions in our charter documents and under Delaware law and our shareholder rights plan could make an acquisition of us, which may be beneficial to our stockholders, more difficult and may prevent attempts by our stockholders to replace or remove our current management.
          Provisions in our certificate of incorporation and our bylaws may delay or prevent an acquisition of us or a change in our management. In addition, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our board of directors. Because our board of directors is responsible for appointing the members of our management team, these provisions could in turn affect any attempt by our stockholders to replace current members of our management team. These provisions include:

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    a classified board of directors;
 
    a prohibition on actions by our stockholders by written consent;
 
    limitations on the removal of directors; and
 
    advance notice requirements for election to our board of directors and for proposing matters that can be acted upon at stockholder meetings.
          In addition, in July 2005, our board of directors adopted a shareholder rights plan, the provisions of which could make it more difficult for a potential acquirer of Alnylam to consummate an acquisition transaction.
          Moreover, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which prohibits a person who owns in excess of 15% of our outstanding voting stock from merging or combining with us for a period of three years after the date of the transaction in which the person acquired in excess of 15% of our outstanding voting stock, unless the merger or combination is approved in a prescribed manner. These provisions would apply even if the proposed merger or acquisition could be considered beneficial by some stockholders.
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
          As part of our investment portfolio we own financial instruments that are sensitive to market risks. The investment portfolio is used to preserve our capital until it is required to fund operations, including our research and development activities. Our marketable securities consist of U.S. government obligations, corporate debt, and commercial paper. All of our investments in debt securities are classified as “available-for-sale” and are recorded at fair value. Our “available-for-sale” investments are sensitive to changes in interest rates. Interest rate changes would result in a change in the net fair value of these financial instruments due to the difference between the market interest rate and the market interest rate at the date of purchase of the financial instrument. A 10% decrease in market interest rates would impact the net fair value of such interest-sensitive financial instruments by less than $50,000.
          Our $10.0 million equipment line of credit with Lighthouse Capital Partners V, L.P. bears an interest rate of prime plus 3% (9.00% at June 30, 2005). The interest rate on each draw that we make under this line of credit is fixed at the time the draw is made. As a result, any changes in the prime rate will not affect our future payments for existing debt outstanding under this line of credit.
           Foreign Currency Exchange Rate Risk
          We are exposed to foreign currency exchange rate risk. Our European operations are based in Kulmbach, Germany and the functional currency of these operations is the Euro. We provide periodic funding to support these operations. The amount of this funding is based upon actual expenditures incurred by our European operations and is calculated in Euros. Because of the frequency with which these operations are funded, we record amounts payable to fund these operations as current liabilities, which eliminate upon consolidation. The effect that fluctuations in the exchange rate between the Euro and the United States Dollar have on the amounts payable to fund our European operations are recorded in our consolidated statements of operations as other income or expense. We do not enter into any foreign exchange hedge contracts.
          Assuming the amount of expenditures by our European operations were consistent with 2004 and the timing of the funding of these operations were to remain consistent during the remainder of 2005, a constant increase or decrease in the exchange rate between the Euro and the United States Dollar during the remainder of 2005 of 10% would result in a foreign exchange gain or loss of between $50,000 and $100,000.
          The amount of our foreign currency exchange rate risk is based on many factors including the timing and size of fluctuations in the currency exchange rate between the Euro and the United States Dollar, the amount of actual expenditures incurred by our European operations and the timing and size of funding provided to our European operations from the United States.

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ITEM 4. CONTROLS AND PROCEDURES
          Our management, with the participation of our chief executive officer and chief operating officer and treasurer, evaluated the effectiveness of our disclosure controls and procedures as of June 30, 2005. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of June 30, 2005, our chief executive officer and chief operating officer and treasurer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.
          No change in our internal control over financial reporting occurred during the fiscal quarter ended June 30, 2005 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION
ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS
(b) Initial Public Offering and Use of Proceeds from Sales of Registered Securities
          We registered shares of our common stock in connection with our initial public offering under the Securities Act. Our Registration Statement on Form S-1 (Reg. No. 333-113162) in connection with our initial public offering was declared effective by the SEC on May 27, 2004. The offering commenced as of May 27, 2004. The offering did not terminate before any securities were sold. As of the date of the filing of this report, the offering has terminated and 5,000,000 shares of our common stock registered were sold in the initial public offering and an additional 750,000 shares of our common stock registered were sold in connection with the exercise of an over-allotment option by the underwriters. The underwriters of the offering were Banc of America Securities LLC, Citigroup Global Markets Inc., Piper Jaffray & Co. and ThinkEquity Partners LLC.
          All 5,750,000 shares of our common stock registered in the offering were sold at the initial public offering price per share of $6.00. The aggregate purchase price of the offering was $34,500,000. The net offering proceeds to us after deducting total expenses were $29,884,000. We incurred total expenses in connection with the offering of $4,616,000, which consisted of direct payments of:
  (i)   $1,929,000 in legal, accounting and printing fees;
 
  (ii)   $2,415,000 in underwriters discounts, fees and commissions; and
 
  (iii)   $272,000 in miscellaneous expenses.
          No payments for such expenses were made directly or indirectly to (i) any of our directors, officers or their associates, (ii) any person(s) owning 10% or more of any class of our equity securities or (iii) any of our affiliates.
          We completed our initial public offering on May 28, 2004.
          There has been no material change in the planned use of proceeds from our initial public offering as described in our final prospectus filed with the SEC pursuant to Rule 424(b).
          From the effective date of our Registration Statement on Form S-1, May 27, 2004, through June 30, 2005, we have utilized approximately $16.8 million of the net proceeds of our initial public offering to fund our operations, approximately $0.8 million to fund capital equipment purchases and approximately $0.4 million to make interest payments on our note payable. The net unused offering proceeds have been invested into short-term investment-grade securities and money market accounts.
ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
          Our annual meeting of stockholders was held on June 8, 2005. At the annual meeting, the following matters were voted upon:
  1.   Our stockholders elected the three persons listed below as Class I directors, each to serve until our 2008 annual meeting of stockholders and until their successors are duly elected and qualified. The table set forth below lists the number of shares of our common stock voted in favor of the election of each such person, as well as the number of votes withheld from such person.
                 
    Number of Shares     Number of Shares  
    For     Withheld  
John M. Maraganore, Ph.D.
    19,579,380       36,628  
Paul R. Schimmel, Ph.D.
    18,466,061       1,149,947  
Phillip A. Sharp, Ph.D.
    18,566,561       1,049,447  

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  2.   Our stockholders approved the compensation to be paid to members of our board of directors, as described in the proxy statement relating to the annual meeting. The holders of 18,199,997 shares of our common stock voted in favor of this proposal. The holders of 1,368,397 shares of our commons stock voted against this proposal. The holders of 47,614 shares of our common stock abstained from voting on this matter.
 
  3.   Our stockholders ratified the appointment by our board of directors of PricewaterhouseCoopers LLP as our independent auditors for the fiscal year ending December 31, 2005. The holders of 19,595,931 shares of our common stock voted in favor of this proposal. The holders of 13,977 shares voted against this proposal. The holders of 6,100 shares abstained from voting on this matter.
ITEM 6. EXHIBITS
     
3.1
  Restated Certificate of Incorporation of the Registrant
 
   
4.1
  Right Agreement dated as of July 13, 2005 between the Registrant and EquiServe Trust Company, N.A., as Rights Agent, which includes as Exhibit A the Form of Certificate of Designations of Series A Junior Participating Preferred Stock, as Exhibit B the Form of Rights Certificate and as Exhibit C the Summary of Rights to Purchase Preferred Stock (filed with the Securities and Exchange Commission as an Exhibit to the Registrant’s Current Report on Form 8-K filed on July 14, 2005 (File No. 000-50743) and incorporated herein by reference).
 
   
10.1
  Summary of Cash Compensation for Directors (filed with the Securities and Exchange Commission as an Exhibit to the Registrant’s Current Report on Form 8-K filed on June 10, 2005 (File No. 000-50743) and incorporated herein by reference).
 
   
10.2
  2004 Stock Incentive Plan, as amended (filed with the Securities and Exchange Commission as an Exhibit to the Registrant’s Current Report on Form 8-K filed on June 10, 2005 (File No. 000-50743) and incorporated herein by reference).
 
   
10.3
  Forms of Incentive Stock Option Agreement and Nonstatutory Stock Option Agreement under 2004 Stock Incentive Plan, as amended.
 
   
10.4
  Form of Nonstatutory Stock Option Agreement under 2004 Stock Incentive Plan Granted to James L. Vincent on July 12, 2005 (filed with the Securities and Exchange Commission as an Exhibit to the Registrant’s Current Report on Form 8-K filed on July 13, 2005 (File No. 000-50743) and incorporated herein by reference).
 
   
10.5
  Form of Restricted Stock Agreement under 2004 Stock Incentive Plan Issued to James L. Vincent on July 12, 2005 (filed with the Securities and Exchange Commission as an Exhibit to the Registrant’s Current Report on Form 8-K filed on July 13, 2005 (File No. 000-50743) and incorporated herein by reference).
 
   
10.6
  Amendment No. 1 to dated August 2, 2004 to Loan and Security Agreement dated as of March 26, 2004 by and between the Registrant and Lighthouse Capital Partners V, L.P.
 
   
10.7
  Amendment No. 02 dated June 20, 2005 to Loan and Security Agreement dated as of March 26, 2004, as amended, by and between the Registrant and Lighthouse Capital Partners V, L.P. (filed with the Securities and Exchange Commission as an Exhibit to the Registrant’s Current Report on Form 8-K filed on June 24, 2005 (File No. 000-50743) and incorporated herein by reference).

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10.8
  Agreement between the Registrant, Garching Innovation GmbH, Alnylam U.S., Inc., a wholly-owned subsidiary of the Registrant, and Alnylam Europe AG, a wholly-owned subsidiary of the Registrant, dated June 14, 2005.
 
   
31.1
  Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, Rule 13a-14(a)/15d-14(a), by Principal Executive Officer.
 
   
31.2
  Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, Rule 13a-14(a)/15d-14(a), by Principal Financial Officer.
 
   
32.1
  Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by Principal Executive Officer.
 
   
32.2
  Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by Principal Financial Officer.

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SIGNATURES
     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized, on August 11, 2005.
         
    ALNYLAM PHARMACEUTICALS, INC.
 
       
 
  By:   /s/ John M. Maraganore
 
       
 
      John M. Maraganore
 
      President and Chief Executive Officer
 
       
 
  By:   /s/ Barry E. Greene
 
       
 
      Barry E. Greene
 
      Chief Operating Officer and Treasurer
 
      (Principal Financial and Accounting Officer)

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EXHIBIT 3.1

RESTATED CERTIFICATE OF INCORPORATION

OF

ALNYLAM PHARMACEUTICALS, INC.

(originally incorporated under the name Alnylam Holding Co. on May 8, 2003)

FIRST: The name of the Corporation is Alnylam Pharmaceuticals, Inc.

SECOND: The address of the Corporation's registered office in the State of Delaware is Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County of New Castle. The name of its registered agent at such address is The Corporation Trust Company.

THIRD: The nature of the business or purposes to be conducted or promoted by the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of Delaware.

FOURTH: The total number of shares of all classes of stock which the Corporation shall have authority to issue is One Hundred Thirty Million (130,000,000) shares, consisting of (i) One Hundred Twenty-Five Million (125,000,000) shares of Common Stock, par value $.01 per share (the "Common Stock"), and (ii) Five Million (5,000,000) shares of Preferred Stock, par value $.01 per share (the "Preferred Stock").

The following is a statement of the designations and the powers, privileges and rights, and the qualifications, limitations or restrictions thereof in respect of each class of capital stock of the Corporation.

A COMMON STOCK.

1. General. The voting, dividend and liquidation rights of the holders of the Common Stock are subject to and qualified by the rights of the holders of the Preferred Stock of any series as may be designated by the Board of Directors upon any issuance of the Preferred Stock of any series.

2. Voting. The holders of the Common Stock shall have voting rights at all meetings of stockholders, each such holder being entitled to one vote for each share thereof held by such holder; provided, however, that, except as otherwise required by law, holders of Common Stock shall not be entitled to vote on any amendment to this Certificate of Incorporation (which, as used herein, shall mean the certificate of incorporation of the Corporation, as amended from time to time, including the terms of any certificate of designation of any series of Preferred Stock) that relates solely to the terms of one or more outstanding series of Preferred Stock if the holders of such affected series are entitled, either separately or together


as a class with the holders of one or more other such series, to vote thereon pursuant to this Certificate of Incorporation. There shall be no cumulative voting.

The number of authorized shares of Common Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority of the stock of the Corporation entitled to vote, irrespective of the provisions of Section 242(b)(2) of the General Corporation Law of Delaware.

3. Dividends. Dividends may be declared and paid on the Common Stock from funds lawfully available therefor as and when determined by the Board of Directors and subject to any preferential dividend or other rights of any then outstanding Preferred Stock.

4. Liquidation. Upon the dissolution or liquidation of the Corporation, whether voluntary or involuntary, holders of Common Stock will be entitled to receive all assets of the Corporation available for distribution to its stockholders, subject to any preferential or other rights of any then outstanding Preferred Stock.

B PREFERRED STOCK.

Preferred Stock may be issued from time to time in one or more series, each of such series to have such terms as stated or expressed herein and in the resolution or resolutions providing for the issue of such series adopted by the Board of Directors of the Corporation as hereinafter provided. Any shares of Preferred Stock which may be redeemed, purchased or acquired by the Corporation may be reissued except as otherwise provided by law. Different series of Preferred Stock shall not be construed to constitute different classes of shares for the purposes of voting by classes unless expressly provided.

Authority is hereby expressly granted to the Board of Directors from time to time to issue the Preferred Stock in one or more series, and in connection with the creation of any such series, by resolution or resolutions providing for the issuance of the shares thereof, to determine and fix the number of shares of such series and such voting powers, full or limited, or no voting powers, and such designations, preferences and relative participating, optional or other special rights, and qualifications, limitations or restrictions thereof, including without limitation thereof, dividend rights, conversion rights, redemption privileges and liquidation preferences, as shall be stated and expressed in such resolutions, all to the full extent now or hereafter permitted by the General Corporation Law of Delaware. Without limiting the generality of the foregoing, the resolutions providing for issuance of any series of Preferred Stock may provide that such series shall be superior or rank equally or be junior to the Preferred Stock of any other series to the extent permitted by law.

The number of authorized shares of Preferred Stock may be increased or decreased (but not below the number of shares then outstanding) by the affirmative vote of the holders of a majority of the stock of the Corporation entitled to vote, irrespective of the provisions of Section 242(b)(2) of the General Corporation Law of Delaware.

FIFTH: Except as otherwise provided herein, the Corporation reserves the right to amend, alter, change or repeal any provision contained in this Certificate of Incorporation, in the

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manner now or hereafter prescribed by statute and this Certificate of Incorporation, and all rights conferred upon stockholders herein are granted subject to this reservation.

SIXTH: In furtherance and not in limitation of the powers conferred upon it by the laws of the State of Delaware, and subject to the terms of any series of Preferred Stock, the Board of Directors shall have the power to adopt, amend, alter or repeal the Corporation's Bylaws. The affirmative vote of a majority of the directors present at any regular or special meeting of the Board of Directors at which a quorum is present shall be required to adopt, amend, alter or repeal the Corporation's Bylaws. The Corporation's Bylaws also may be adopted, amended, altered or repealed by the affirmative vote of the holders of at least seventy-five percent (75%) of the votes which all the stockholders would be entitled to cast in any annual election of directors or class of directors, in addition to any other vote required by this Certificate of Incorporation. Notwithstanding any other provisions of law, this Certificate of Incorporation or the Bylaws of the Corporation, and notwithstanding the fact that a lesser percentage may be specified by law, the affirmative vote of the holders of at least seventy-five percent (75%) of the votes which all the stockholders would be entitled to cast in any annual election of directors or class of directors shall be required to amend or repeal, or to adopt any provision inconsistent with, this Article SIXTH.

SEVENTH: Except to the extent that the General Corporation Law of Delaware prohibits the elimination or limitation of liability of directors for breaches of fiduciary duty, no director of the Corporation shall be personally liable to the Corporation or its stockholders for monetary damages for any breach of fiduciary duty as a director, notwithstanding any provision of law imposing such liability. No amendment to or repeal of this provision shall apply to or have any effect on the liability or alleged liability of any director of the Corporation for or with respect to any acts or omissions of such director occurring prior to such amendment or repeal.

EIGHTH: The Corporation shall provide indemnification as follows:

1. Actions, Suits and Proceedings Other than by or in the Right of the Corporation. The Corporation shall indemnify each person who was or is a party or threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of the Corporation) by reason of the fact that he or she is or was, or has agreed to become, a director or officer of the Corporation, or is or was serving, or has agreed to serve, at the request of the Corporation, as a director, officer, partner, employee or trustee of, or in a similar capacity with, another corporation, partnership, joint venture, trust or other enterprise (including any employee benefit plan) (all such persons being referred to hereafter as an "Indemnitee"), or by reason of any action alleged to have been taken or omitted in such capacity, against all expenses (including attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by or on behalf of Indemnitee in connection with such action, suit or proceeding and any appeal therefrom, if Indemnitee acted in good faith and in a manner which Indemnitee reasonably believed to be in, or not opposed to, the best interests of the Corporation, and, with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful. The termination of any action, suit or proceeding by judgment, order, settlement, conviction or upon a plea of nolo contendere or its equivalent, shall not, of itself, create a presumption that Indemnitee did not act in good faith and in a manner which Indemnitee

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reasonably believed to be in, or not opposed to, the best interests of the Corporation, and, with respect to any criminal action or proceeding, had reasonable cause to believe that his or her conduct was unlawful.

2. Actions or Suits by or in the Right of the Corporation. The Corporation shall indemnify any Indemnitee who was or is a party to or threatened to be made a party to any threatened, pending or completed action or suit by or in the right of the Corporation to procure a judgment in its favor by reason of the fact that Indemnitee is or was, or has agreed to become, a director or officer of the Corporation, or is or was serving, or has agreed to serve, at the request of the Corporation, as a director, officer, partner, employee or trustee of, or in a similar capacity with, another corporation, partnership, joint venture, trust or other enterprise (including any employee benefit plan), or by reason of any action alleged to have been taken or omitted in such capacity, against all expenses (including attorneys' fees) and, to the extent permitted by law, amounts paid in settlement actually and reasonably incurred by or on behalf of Indemnitee in connection with such action, suit or proceeding and any appeal therefrom, if Indemnitee acted in good faith and in a manner which Indemnitee reasonably believed to be in, or not opposed to, the best interests of the Corporation, except that no indemnification shall be made under this Section 2 in respect of any claim, issue or matter as to which Indemnitee shall have been adjudged to be liable to the Corporation, unless, and only to the extent, that the Court of Chancery of Delaware shall determine upon application that, despite the adjudication of such liability but in view of all the circumstances of the case, Indemnitee is fairly and reasonably entitled to indemnity for such expenses (including attorneys' fees) which the Court of Chancery of Delaware shall deem proper.

3. Indemnification for Expenses of Successful Party. Notwithstanding any other provisions of this Article, to the extent that an Indemnitee has been successful, on the merits or otherwise, in defense of any action, suit or proceeding referred to in Sections 1 and 2 of this Article EIGHTH, or in defense of any claim, issue or matter therein, or on appeal from any such action, suit or proceeding, Indemnitee shall be indemnified against all expenses (including attorneys' fees) actually and reasonably incurred by or on behalf of Indemnitee in connection therewith. Without limiting the foregoing, if any action, suit or proceeding is disposed of, on the merits or otherwise (including a disposition without prejudice), without (i) the disposition being adverse to Indemnitee,
(ii) an adjudication that Indemnitee was liable to the Corporation, (iii) a plea of guilty or nolo contendere by Indemnitee, (iv) an adjudication that Indemnitee did not act in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of the Corporation, and (v) with respect to any criminal proceeding, an adjudication that Indemnitee had reasonable cause to believe his conduct was unlawful, Indemnitee shall be considered for the purposes hereof to have been wholly successful with respect thereto.

4. Notification and Defense of Claim. As a condition precedent to an Indemnitee's right to be indemnified, such Indemnitee must notify the Corporation in writing as soon as practicable of any action, suit, proceeding or investigation involving such Indemnitee for which indemnity will or could be sought. With respect to any action, suit, proceeding or investigation of which the Corporation is so notified, the Corporation will be entitled to participate therein at its own expense and/or to assume the defense thereof at its own expense, with legal counsel reasonably acceptable to Indemnitee. After notice from the Corporation to Indemnitee of its election so to assume such defense, the Corporation shall not be liable to Indemnitee for any

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legal or other expenses subsequently incurred by Indemnitee in connection with such action, suit, proceeding or investigation, other than as provided below in this Section 4. Indemnitee shall have the right to employ his or her own counsel in connection with such action, suit, proceeding or investigation, but the fees and expenses of such counsel incurred after notice from the Corporation of its assumption of the defense thereof shall be at the expense of Indemnitee unless
(i) the employment of counsel by Indemnitee has been authorized by the Corporation, (ii) counsel to Indemnitee shall have reasonably concluded that there may be a conflict of interest or position on any significant issue between the Corporation and Indemnitee in the conduct of the defense of such action, suit, proceeding or investigation or (iii) the Corporation shall not in fact have employed counsel to assume the defense of such action, suit, proceeding or investigation, in each of which cases the fees and expenses of counsel for Indemnitee shall be at the expense of the Corporation, except as otherwise expressly provided by this Article. The Corporation shall not be entitled, without the consent of Indemnitee, to assume the defense of any claim brought by or in the right of the Corporation or as to which counsel for Indemnitee shall have reasonably made the conclusion provided for in clause (ii) above. The Corporation shall not be required to indemnify Indemnitee under this Article EIGHTH for any amounts paid in settlement of any action, suit, proceeding or investigation effected without its written consent. The Corporation shall not settle any action, suit, proceeding or investigation in any manner which would impose any penalty or limitation on Indemnitee without Indemnitee's written consent. Neither the Corporation nor Indemnitee will unreasonably withhold or delay its consent to any proposed settlement.

5. Advance of Expenses. Subject to the provisions of Section 6 of this Article EIGHTH, in the event that the Corporation does not assume the defense pursuant to Section 4 of this Article EIGHTH of any action, suit, proceeding or investigation of which the Corporation receives notice under this Article, any expenses (including attorneys' fees) incurred by or on behalf of Indemnitee in defending an action, suit, proceeding or investigation or any appeal therefrom shall be paid by the Corporation in advance of the final disposition of such matter; provided, however, that the payment of such expenses incurred by or on behalf of Indemnitee in advance of the final disposition of such matter shall be made only upon receipt of an undertaking by or on behalf of Indemnitee to repay all amounts so advanced in the event that it shall ultimately be determined that Indemnitee is not entitled to be indemnified by the Corporation as authorized in this Article; and further provided that no such advancement of expenses shall be made under this Article EIGHTH if it is determined (in the manner described in
Section 6) that (i) Indemnitee did not act in good faith and in a manner he reasonably believed to be in, or not opposed to, the best interests of the Corporation, or (ii) with respect to any criminal action or proceeding, Indemnitee had reasonable cause to believe his conduct was unlawful. Such undertaking shall be accepted without reference to the financial ability of Indemnitee to make such repayment.

6. Procedure for Indemnification. In order to obtain indemnification or advancement of expenses pursuant to Section 1, 2, 3 or 5 of this Article EIGHTH, an Indemnitee shall submit to the Corporation a written request. Any such advancement of expenses shall be made promptly, and in any event within 30 days after receipt by the Corporation of the written request of Indemnitee, unless the Corporation determines within such 30-day period that Indemnitee did not meet the applicable standard of conduct set forth in Section 1, 2 or 5 of this Article EIGHTH, as the case may be. Any such indemnification, unless ordered by a court, shall

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be made with respect to requests under Section 1 or 2 only as authorized in the specific case upon a determination by the Corporation that the indemnification of Indemnitee is proper because Indemnitee has met the applicable standard of conduct set forth in Section 1 or 2, as the case may be. Such determination shall be made in each instance (a) by a majority vote of the directors of the Corporation consisting of persons who are not at that time parties to the action, suit or proceeding in question ("disinterested directors"), whether or not a quorum, (b) by a committee of disinterested directors designated by majority vote of disinterested directors, whether or not a quorum, (c) if there are no disinterested directors, or if the disinterested directors so direct, by independent legal counsel (who may, to the extent permitted by law, be regular legal counsel to the Corporation) in a written opinion, or (d) by the stockholders of the Corporation.

7. Remedies. The right to indemnification or advancement of expenses as granted by this Article shall be enforceable by Indemnitee in any court of competent jurisdiction. Neither the failure of the Corporation to have made a determination prior to the commencement of such action that indemnification is proper in the circumstances because Indemnitee has met the applicable standard of conduct, nor an actual determination by the Corporation pursuant to Section 6 of this Article EIGHTH that Indemnitee has not met such applicable standard of conduct, shall be a defense to the action or create a presumption that Indemnitee has not met the applicable standard of conduct. Indemnitee's expenses (including attorneys' fees) reasonably incurred in connection with successfully establishing Indemnitee's right to indemnification, in whole or in part, in any such proceeding shall also be indemnified by the Corporation.

8. Limitations. Notwithstanding anything to the contrary in this Article, except as set forth in Section 7 of this Article EIGHTH, the Corporation shall not indemnify an Indemnitee pursuant to this Article EIGHTH in connection with a proceeding (or part thereof) initiated by such Indemnitee unless the initiation thereof was approved by the Board of Directors of the Corporation. Notwithstanding anything to the contrary in this Article, the Corporation shall not indemnify an Indemnitee to the extent such Indemnitee is reimbursed from the proceeds of insurance, and in the event the Corporation makes any indemnification payments to an Indemnitee and such Indemnitee is subsequently reimbursed from the proceeds of insurance, such Indemnitee shall promptly refund indemnification payments to the Corporation to the extent of such insurance reimbursement; provided, however, that nothing contained in this Section 8 shall be construed to require any Indemnitee to seek reimbursement under any insurance policy.

9. Subsequent Amendment. No amendment, termination or repeal of this Article or of the relevant provisions of the General Corporation Law of Delaware or any other applicable laws shall affect or diminish in any way the rights of any Indemnitee to indemnification under the provisions hereof with respect to any action, suit, proceeding or investigation arising out of or relating to any actions, transactions or facts occurring prior to the final adoption of such amendment, termination or repeal.

10. Other Rights. The indemnification and advancement of expenses provided by this Article shall not be deemed exclusive of any other rights to which an Indemnitee seeking indemnification or advancement of expenses may be entitled under any law (common or statutory), agreement or vote of stockholders or disinterested directors or otherwise, both as to action in Indemnitee's official capacity and as to action in any other capacity while holding

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office for the Corporation, and shall continue as to an Indemnitee who has ceased to be a director or officer, and shall inure to the benefit of the estate, heirs, executors and administrators of Indemnitee. Nothing contained in this Article shall be deemed to prohibit, and the Corporation is specifically authorized to enter into, agreements with officers and directors providing indemnification rights and procedures different from those set forth in this Article. In addition, the Corporation may, to the extent authorized from time to time by its Board of Directors, grant indemnification rights to other employees or agents of the Corporation or other persons serving the Corporation and such rights may be equivalent to, or greater or less than, those set forth in this Article.

11. Partial Indemnification. If an Indemnitee is entitled under any provision of this Article to indemnification by the Corporation for some or a portion of the expenses (including attorneys' fees), judgments, fines or amounts paid in settlement actually and reasonably incurred by or on behalf of Indemnitee in connection with any action, suit, proceeding or investigation and any appeal therefrom but not, however, for the total amount thereof, the Corporation shall nevertheless indemnify Indemnitee for the portion of such expenses (including attorneys' fees), judgments, fines or amounts paid in settlement to which Indemnitee is entitled.

12. Insurance. The Corporation may purchase and maintain insurance, at its expense, to protect itself and any director, officer, employee or agent of the Corporation or another corporation, partnership, joint venture, trust or other enterprise (including any employee benefit plan) against any expense, liability or loss incurred by him in any such capacity, or arising out of his status as such, whether or not the Corporation would have the power to indemnify such person against such expense, liability or loss under the General Corporation Law of Delaware.

13. Savings Clause. If this Article or any portion hereof shall be invalidated on any ground by any court of competent jurisdiction, then the Corporation shall nevertheless indemnify each Indemnitee as to any expenses (including attorneys' fees), judgments, fines and amounts paid in settlement in connection with any action, suit, proceeding or investigation, whether civil, criminal or administrative, including an action by or in the right of the Corporation, to the fullest extent permitted by any applicable portion of this Article that shall not have been invalidated and to the fullest extent permitted by applicable law.

14. Definitions. Terms used herein and defined in Section 145(h) and
Section 145(i) of the General Corporation Law of Delaware shall have the respective meanings assigned to such terms in such Section 145(h) and Section 145(i).

NINTH: This Article is inserted for the management of the business and for the conduct of the affairs of the Corporation.

1. General Powers. The business and affairs of the Corporation shall be managed by or under the direction of the Corporation's Board of Directors.

2. Number of Directors; Election of Directors. Subject to the rights of holders of any series of Preferred Stock to elect directors, the number of directors of the Corporation shall be established by the Board of Directors. Election of directors need not be by written ballot, except as and to the extent provided in the Bylaws of the Corporation.

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3. Classes of Directors. Subject to the rights of holders of any series of Preferred Stock to elect directors, the Board of Directors shall be and is divided into three classes: Class I, Class II and Class III.

4. Terms of Office. Subject to the rights of holders of any series of Preferred Stock to elect directors, each director shall serve for a term ending on the date of the third annual meeting following the annual meeting at which such director was elected; provided, that each director initially appointed to Class I shall serve for a term expiring at the Corporation's annual meeting of stockholders held in 2005; each director initially appointed to Class II shall serve for a term expiring at the Corporation's annual meeting of stockholders held in 2006; and each director initially appointed to Class III shall serve for a term expiring at the Corporation's annual meeting of stockholders held in 2007; provided further, that the term of each director shall continue until the election and qualification of his successor and be subject to his earlier death, resignation or removal.

5. Quorum. The greater of (a) a majority of the directors at any time in office and (b) one-third of the number of directors fixed pursuant to Section 2 of this Article NINTH shall constitute a quorum. If at any meeting of the Board of Directors there shall be less than such a quorum, a majority of the directors present may adjourn the meeting from time to time without further notice other than announcement at the meeting, until a quorum shall be present.

6. Action at Meeting. Every act or decision done or made by a majority of the directors present at a meeting duly held at which a quorum is present shall be regarded as the act of the Board of Directors unless a greater number is required by law or by this Certificate of Incorporation.

7. Removal. Subject to the rights of holders of any series of Preferred Stock, directors of the Corporation may be removed only for cause and only by the affirmative vote of the holders of at least seventy-five percent (75%) of the votes which all the stockholders would be entitled to cast in any annual election of directors or class of directors.

8. Vacancies. Subject to the rights of holders of any series of Preferred Stock, any vacancy or newly created directorships in the Board of Directors, however occurring, shall be filled only by vote of a majority of the directors then in office, although less than a quorum, or by a sole remaining director and shall not be filled by the stockholders. A director elected to fill a vacancy shall hold office until the next election of the class for which such director shall have been chosen, subject to the election and qualification of a successor and to such director's earlier death, resignation or removal.

9. Stockholder Nominations and Introduction of Business, Etc. Advance notice of stockholder nominations for election of directors and other business to be brought by stockholders before a meeting of stockholders shall be given in the manner provided by the Bylaws of the Corporation.

10. Amendments to Article. Notwithstanding any other provisions of law, this Certificate of Incorporation or the Bylaws of the Corporation, and notwithstanding the fact that a lesser percentage may be specified by law, the affirmative vote of the holders of at least seventy-

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five percent (75%) of the votes which all the stockholders would be entitled to cast in any annual election of directors or class of directors shall be required to amend or repeal, or to adopt any provision inconsistent with, this Article NINTH.

TENTH: Stockholders of the Corporation may not take any action by written consent in lieu of a meeting. Notwithstanding any other provisions of law, this Certificate of Incorporation or the Bylaws of the Corporation, and notwithstanding the fact that a lesser percentage may be specified by law, the affirmative vote of the holders of at least seventy-five percent (75%) of the votes which all the stockholders would be entitled to cast in any annual election of directors or class of directors shall be required to amend or repeal, or to adopt any provision inconsistent with, this Article TENTH.

ELEVENTH: Special meetings of stockholders for any purpose or purposes may be called at any time by the Board of Directors, the Chairman of the Board or the Chief Executive Officer, but such special meetings may not be called by any other person or persons. Business transacted at any special meeting of stockholders shall be limited to matters relating to the purpose or purposes stated in the notice of meeting. Notwithstanding any other provision of law, this Certificate of Incorporation or the Bylaws of the Corporation, and notwithstanding the fact that a lesser percentage may be specified by law, the affirmative vote of the holders of at least seventy-five percent (75%) of the votes which all the stockholders would be entitled to cast in any annual election of directors or class of directors shall be required to amend or repeal, or to adopt any provision inconsistent with, this Article ELEVENTH.

IN WITNESS WHEREOF, this Restated Certificate of Incorporation, which restates, integrates and amends the certificate of incorporation of the Corporation, and which has been duly adopted in accordance with Sections 228, 242 and 245 of the Delaware General Corporation Code, has been executed by its duly authorized officer this 3rd day of June, 2004.

ALNYLAM PHARMACEUTICALS, INC.

By: /s/ John M. Maraganore
    ------------------------------------
    John M. Maraganore
    President and Chief Executive Officer

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CERTIFICATE OF DESIGNATIONS

OF

SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

OF

ALNYLAM PHARMACEUTICALS, INC.


Alnylam Pharmaceuticals, Inc., a corporation organized and existing under the laws of the State of Delaware (hereinafter called the "Corporation"), hereby certifies that the following resolution was adopted by the Board of Directors of the Corporation at a meeting duly called and held on July 13, 2005:

RESOLVED: That pursuant to the authority granted to and vested in the Board of Directors of the Corporation (hereinafter called the "Board") in accordance with the provisions of the Certificate of Incorporation, as amended, the Board hereby creates a series of Preferred Stock, $.01 par value per share (the "Preferred Stock"), of the Corporation and hereby states the designation and number of shares, and fixes the relative rights, preferences and limitations thereof as follows:

SERIES A JUNIOR PARTICIPATING PREFERRED STOCK:

Section 1. Designation and Amount. The shares of such series shall be designated as "Series A Junior Participating Preferred Stock" (the "Series A Preferred Stock") and the number of shares constituting the Series A Preferred Stock shall be one hundred twenty-five thousand (125,000). Such number of shares may be increased or decreased by resolution of the Board prior to issuance; provided, that no decrease shall reduce the number of shares of Series A Preferred Stock to a number less than the number of shares then outstanding plus the number of shares reserved for issuance upon the exercise of outstanding options, rights or warrants or upon the conversion of any outstanding securities issued by the Corporation convertible into Series A Preferred Stock.

Section 2. Dividends and Distributions.

(A) Subject to the rights of the holders of any shares of any series of Preferred Stock (or any similar stock) ranking prior and superior to the Series A Preferred Stock with respect to dividends, the holders of shares of Series A Preferred Stock, in preference to the holders of Common Stock, par value $.01 per share (the "Common Stock"), of the Corporation, and of any other junior stock, shall be entitled to receive, when, as and if declared by the Board out of funds of the Corporation legally available for the payment of dividends, quarterly dividends payable in cash on the last day of each fiscal quarter of the Corporation in each year (each such date being referred to herein as a "Quarterly Dividend Payment Date"), commencing on the first Quarterly


Dividend Payment Date after the first issuance of a share or fraction of a share of Series A Preferred Stock, in an amount per share (rounded to the nearest cent) equal to the greater of (a) $10 or (b) subject to the provision for adjustment hereinafter set forth, 1000 times the aggregate per share amount of all cash dividends, and 1000 times the aggregate per share amount (payable in kind) of all non-cash dividends or other distributions, other than a dividend payable in shares of Common Stock or a subdivision of the outstanding shares of Common Stock (by reclassification or otherwise), declared on the Common Stock since the immediately preceding Quarterly Dividend Payment Date or, with respect to the first Quarterly Dividend Payment Date, since the first issuance of any share or fraction of a share of Series A Preferred Stock. In the event the Corporation shall at any time declare or pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision, combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the amount to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event under clause (b) of the preceding sentence shall be adjusted by multiplying such amount by a fraction, the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event. In the event the Corporation shall at any time declare or pay any dividend on the Series A Preferred Stock payable in shares of Series A Preferred Stock, or effect a subdivision, combination or consolidation of the outstanding shares of Series A Preferred Stock (by reclassification or otherwise than by payment of a dividend in shares of Series A Preferred Stock) into a greater or lesser number of shares of Series A Preferred Stock, then in each such case the amount to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event under clause (b) of the first sentence of this Section 2(A) shall be adjusted by multiplying such amount by a fraction, the numerator of which is the number of shares of Series A Preferred Stock that were outstanding immediately prior to such event and the denominator of which is the number of shares of Series A Preferred Stock outstanding immediately after such event.

(B) The Corporation shall declare a dividend or distribution on the Series A Preferred Stock as provided in paragraph (A) of this Section immediately after it declares a dividend or distribution on the Common Stock (other than a dividend payable in shares of Common Stock) and the Corporation shall pay such dividend or distribution on the Series A Preferred Stock before the dividend or distribution declared on the Common Stock is paid or set apart; provided that, in the event no dividend or distribution shall have been declared on the Common Stock during the period between any Quarterly Dividend Payment Date and the next subsequent Quarterly Dividend Payment Date, a dividend of $10 per share on the Series A Preferred Stock shall nevertheless be payable on such subsequent Quarterly Dividend Payment Date.

(C) Dividends shall begin to accrue and be cumulative on outstanding shares of Series A Preferred Stock from the Quarterly Dividend Payment Date next preceding the date of issue of such shares, unless the date of issue of such shares is prior to the record date for the first Quarterly Dividend Payment Date, in which case dividends on such shares shall begin to accrue from the date of issue of such shares, or unless the date of issue is a Quarterly Dividend Payment Date or is a date after the record date for the determination of holders of shares of Series A Preferred Stock entitled to receive a quarterly dividend and before such Quarterly Dividend

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Payment Date, in either of which events such dividends shall begin to accrue and be cumulative from such Quarterly Dividend Payment Date. Accrued but unpaid dividends shall not bear interest. Dividends paid on the shares of Series A Preferred Stock in an amount less than the total amount of such dividends at the time accrued and payable on such shares shall be allocated pro rata on a share-by-share basis among all such shares at the time outstanding. The Board may fix a record date for the determination of holders of shares of Series A Preferred Stock entitled to receive payment of a dividend or distribution declared thereon, which record date shall be not more than 60 days prior to the date fixed for the payment thereof.

Section 3. Voting Rights. The holders of shares of Series A Preferred Stock shall have the following voting rights:

(A) Subject to the provision for adjustment hereinafter set forth, each share of Series A Preferred Stock shall entitle the holder thereof to 1000 votes on all matters submitted to a vote of the stockholders of the Corporation. In the event the Corporation shall at any time declare or pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision, combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the number of votes per share to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event shall be adjusted by multiplying such number by a fraction, the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event. In the event the Corporation shall at any time declare or pay any dividend on the Series A Preferred Stock payable in shares of Series A Preferred Stock, or effect a subdivision, combination or consolidation of the outstanding shares of Series A Preferred Stock (by reclassification or otherwise than by payment of a dividend in shares of Series A Preferred Stock) into a greater or lesser number of shares of Series A Preferred Stock, then in each such case the number of votes per share to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event shall be adjusted by multiplying such amount by a fraction, the numerator of which is the number of shares of Series A Preferred Stock that were outstanding immediately prior to such event and the denominator of which is the number of shares of Series A Preferred Stock outstanding immediately after such event.

(B) Except as otherwise provided herein, in the Certificate of Incorporation or by law, the holders of shares of Series A Preferred Stock and the holders of shares of Common Stock and any other capital stock of the Corporation having general voting rights shall vote together as one class on all matters submitted to a vote of stockholders of the Corporation.

(C) (i) If at any time dividends on any Series A Preferred Stock shall be in arrears in an amount equal to six quarterly dividends thereon, the holders of the Series A Preferred Stock, voting as a separate series from all other series of Preferred Stock and classes of capital stock, shall be entitled to elect two members of the Board in addition to any Directors elected by any other series, class or classes of securities and the authorized number of Directors will automatically be increased by two. Promptly thereafter, the Board of the Corporation shall, as soon as may be practicable, call a special meeting of holders of Series A Preferred Stock for the

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purpose of electing such members of the Board. Such special meeting shall in any event be held within 45 days of the occurrence of such arrearage.

(ii) During any period when the holders of Series A Preferred Stock, voting as a separate series, shall be entitled and shall have exercised their right to elect two Directors, then, and during such time as such right continues, (a) the then authorized number of Directors shall be increased by two, and the holders of Series A Preferred Stock, voting as a separate series, shall be entitled to elect the additional Directors so provided for, and (b) each such additional Director shall not be a member of any existing class of the Board, but shall serve until the next annual meeting of stockholders for the election of Directors, or until his successor shall be elected and shall qualify, or until his right to hold such office terminates pursuant to the provisions of this Section 3(C).

(iii) A Director elected pursuant to the terms hereof may be removed with or without cause by the holders of Series A Preferred Stock entitled to vote in an election of such Director.

(iv) If, during any interval between annual meetings of stockholders for the election of Directors and while the holders of Series A Preferred Stock shall be entitled to elect two Directors, there is no such Director in office by reason of resignation, death or removal, then, promptly thereafter, the Board shall call a special meeting of the holders of Series A Preferred Stock for the purpose of filling such vacancy and such vacancy shall be filled at such special meeting. Such special meeting shall in any event be held within 45 days of the occurrence of such vacancy.

(v) At such time as the arrearage is fully cured, and all dividends accumulated and unpaid on any shares of Series A Preferred Stock outstanding are paid, and, in addition thereto, at least one regular dividend has been paid subsequent to curing such arrearage, the term of office of any Director elected pursuant to this Section 3(C), or his successor, shall automatically terminate, and the authorized number of Directors shall automatically decrease by two, the rights of the holders of the shares of the Series A Preferred Stock to vote as provided in this Section 3(C) shall cease, subject to renewal from time to time upon the same terms and conditions, and the holders of shares of the Series A Preferred Stock shall have only the limited voting rights elsewhere herein set forth.

(D) Except as set forth herein, or as otherwise provided by law, holders of Series A Preferred Stock shall have no special voting rights and their consent shall not be required (except to the extent they are entitled to vote with holders of Common Stock as set forth herein) for taking any corporate action.

Section 4. Certain Restrictions.

(A) Whenever quarterly dividends or other dividends or distributions payable on the Series A Preferred Stock as provided in Section 2 are in arrears, thereafter and until all accrued and unpaid dividends and distributions, whether or not declared, on shares of Series A Preferred Stock outstanding shall have been paid in full, the Corporation shall not:

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(i) declare or pay dividends, or make any other distributions, on any shares of stock ranking junior (either as to dividends or upon liquidation, dissolution or winding up) to the Series A Preferred Stock;

(ii) declare or pay dividends, or make any other distributions, on any shares of stock ranking on a parity (either as to dividends or upon liquidation, dissolution or winding up) with the Series A Preferred Stock, except dividends paid ratably on the Series A Preferred Stock and all such parity stock on which dividends are payable or in arrears in proportion to the total amounts to which the holders of all such shares are then entitled;

(iii) redeem or purchase or otherwise acquire for consideration shares of any stock ranking junior (either as to dividends or upon liquidation, dissolution or winding up) to the Series A Preferred Stock, provided that the Corporation may at any time redeem, purchase or otherwise acquire shares of any such junior stock in exchange for shares of any stock of the Corporation ranking junior (either as to dividends or upon dissolution, liquidation or winding up) to the Series A Preferred Stock; or

(iv) redeem or purchase or otherwise acquire for consideration any shares of Series A Preferred Stock, or any shares of stock ranking on a parity with the Series A Preferred Stock, except in accordance with a purchase offer made in writing or by publication (as determined by the Board) to all holders of such shares upon such terms as the Board, after consideration of the respective annual dividend rates and other relative rights and preferences of the respective series and classes, shall determine in good faith will result in fair and equitable treatment among the respective series or classes.

(B) The Corporation shall not permit any subsidiary of the Corporation to purchase or otherwise acquire for consideration any shares of stock of the Corporation unless the Corporation could, under paragraph (A) of this Section 4, purchase or otherwise acquire such shares at such time and in such manner.

Section 5. Reacquired Shares. Any shares of Series A Preferred Stock purchased or otherwise acquired by the Corporation in any manner whatsoever shall be retired and cancelled promptly after the acquisition thereof. All such shares shall upon their cancellation become authorized but unissued shares of Preferred Stock and may be reissued as part of a new series of Preferred Stock subject to the conditions and restrictions on issuance set forth herein, in the Certificate of Incorporation, or in any other Certificate of Designations creating a series of Preferred Stock or any similar stock or as otherwise required by law.

Section 6. Liquidation, Dissolution or Winding Up.

(A) Upon any liquidation, dissolution or winding up of the Corporation, no distribution shall be made (1) to the holders of shares of stock ranking junior (either as to dividends or upon liquidation, dissolution or winding up) to the Series A Preferred Stock unless, prior thereto, the holders of shares of Series A Preferred Stock shall have received $1000 per share, plus an amount equal to accrued and unpaid dividends and distributions thereon, whether or not declared, to the date of such payment, provided that the holders of shares of Series A Preferred Stock shall be entitled to receive an aggregate amount per share, subject to the

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provision for adjustment hereinafter set forth, equal to 1000 times the aggregate amount to be distributed per share to holders of shares of Common Stock, or (2) to the holders of shares of stock ranking on a parity (either as to dividends or upon liquidation, dissolution or winding up) with the Series A Preferred Stock, except distributions made ratably on the Series A Preferred Stock and all such parity stock in proportion to the total amounts to which the holders of all such shares are entitled upon such liquidation, dissolution or winding up.

(B) Neither the consolidation, merger or other business combination of the Corporation with or into any other corporation nor the sale, lease, exchange or conveyance of all or any part of the property, assets or business of the Corporation shall be deemed to be a liquidation, dissolution or winding up of the Corporation for purposes of this Section 6.

(C) In the event the Corporation shall at any time declare or pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision, combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the aggregate amount to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event under the proviso in clause (1) of paragraph (A) of this Section 6 shall be adjusted by multiplying such amount by a fraction, the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event. In the event the Corporation shall at any time declare or pay any dividend on the Series A Preferred Stock payable in shares of Series A Preferred Stock, or effect a subdivision, combination or consolidation of the outstanding shares of Series A Preferred Stock (by reclassification or otherwise than by payment of a dividend in shares of Series A Preferred Stock) into a greater or lesser number of shares of Series A Preferred Stock, then in each such case the aggregate amount to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event under the proviso in clause (1) of paragraph (A) of this Section 6 shall be adjusted by multiplying such amount by a fraction, the numerator of which is the number of shares of Series A Preferred Stock that were outstanding immediately prior to such event and the denominator of which is the number of shares of Series A Preferred Stock outstanding immediately after such event.

Section 7. Consolidation, Merger, etc. Notwithstanding anything to the contrary contained herein, in case the Corporation shall enter into any consolidation, merger, combination or other transaction in which the shares of Common Stock are exchanged for or changed into other stock or securities, cash and/or any other property, then in any such case each share of Series A Preferred Stock shall at the same time be similarly exchanged or changed into an amount per share, subject to the provision for adjustment hereinafter set forth, equal to 1,000 times the aggregate amount of stock, securities, cash and/or any other property (payable in kind), as the case may be, into which or for which each share of Common Stock is changed or exchanged. In the event the Corporation shall at any time declare or pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision, combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the amount set forth in the preceding sentence with respect to the exchange or change of shares of Series A Preferred Stock shall be adjusted by

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multiplying such amount by a fraction, the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event. In the event the Corporation shall at any time declare or pay any dividend on the Series A Preferred Stock payable in shares of Series A Preferred Stock, or effect a subdivision, combination or consolidation of the outstanding shares of Series A Preferred Stock (by reclassification or otherwise than by payment of a dividend in shares of Series A Preferred Stock) into a greater or lesser number of shares of Series A Preferred Stock, then in each such case the amount set forth in the first sentence of this Section 7 with respect to the exchange or change of shares of Series A Preferred Stock shall be adjusted by multiplying such amount by a fraction, the numerator of which is the number of shares of Series A Preferred Stock that were outstanding immediately prior to such event and the denominator of which is the number of shares of Series A Preferred Stock outstanding immediately after such event.

Section 8. No Redemption. The shares of Series A Preferred Stock shall not be redeemable.

Section 9. Rank. The Series A Preferred Stock shall rank, with respect to the payment of dividends and the distribution of assets, junior to all series of any other class of the Preferred Stock issued either before or after the issuance of the Series A Preferred Stock, unless the terms of any such series shall provide otherwise.

Section 10. Amendment. At such time as any shares of Series A Preferred Stock are outstanding, the Certificate of Incorporation, as amended, of the Corporation shall not be amended in any manner which would materially alter or change the powers, preferences or special rights of the Series A Preferred Stock so as to affect them adversely without the affirmative vote of the holders of at least two-thirds of the outstanding shares of Series A Preferred Stock, voting together as a single class.

Section 11. Fractional Shares. Series A Preferred Stock may be issued in fractions of a share which shall entitle the holder, in proportion to such holder's fractional shares, to exercise voting rights, receive dividends, participate in distributions and have the benefit of all other rights of holders of Series A Preferred Stock.

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IN WITNESS WHEREOF, this Certificate of Designations is executed on behalf of the Corporation by its Chief Executive Officer this 14th day of July, 2005.

ALNYLAM PHARMACEUTICALS, INC.

By: /s/ John M. Maraganore
    ----------------------------------------
Name: John M. Maraganore
Title: President and Chief Executive Officer


EXHIBIT 10.3

ALNYLAM PHARMACEUTICALS, INC.

Incentive Stock Option Agreement
Granted Under 2004 Stock Incentive Plan

1. Grant of Option.

This agreement evidences the grant by Alnylam Pharmaceuticals, Inc., a Delaware corporation (the "Company"), on ________, 200[ ] (the "Grant Date") to
[______], an employee of the Company (the "Participant"), of an option to purchase, in whole or in part, on the terms provided herein and in the Company's 2004 Stock Incentive Plan (the "Plan"), a total of [__] shares (the "Shares") of common stock, $.01 par value per share, of the Company ("Common Stock") at $[__] per Share. Unless earlier terminated, this option shall expire at 5:00 p.m., Eastern time, on [the date that is ten years from the Grant Date] (the "Final Exercise Date").

It is intended that the option evidenced by this agreement shall be an incentive stock option as defined in Section 422 of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the "Code"). Except as otherwise indicated by the context, the term "Participant", as used in this option, shall be deemed to include any person who acquires the right to exercise this option validly under its terms.

2. Vesting Schedule.

This option will become exercisable ("vest") as to [____________________].

The right of exercise shall be cumulative so that to the extent the option is not exercised in any period to the maximum extent permissible it shall continue to be exercisable, in whole or in part, with respect to all Shares for which it is vested until the earlier of the Final Exercise Date or the termination of this option under Section 3 hereof or the Plan.

3. Exercise of Option.

(a) Form of Exercise. Each election to exercise this option shall be in writing, signed by the Participant, and received by the Company at its principal office, accompanied by this agreement, and payment in full in the manner provided in the Plan. The Participant may purchase less than the number of shares covered hereby, provided that no partial exercise of this option may be for any fractional share or for fewer than ten whole shares.

(b) Continuous Relationship with the Company Required. Except as otherwise provided in this Section 3, this option may not be exercised unless the Participant, at the time he or she exercises this option, is, and has been at all times since the Grant Date, an employee or officer of, or consultant or advisor to, the Company or any parent or subsidiary of the Company as defined in
Section 424(e) or (f) of the Code (an "Eligible Participant").


(c) Termination of Relationship with the Company. If the Participant ceases to be an Eligible Participant for any reason, then, except as provided in paragraphs (d) and (e) below, the right to exercise this option shall terminate three months after such cessation (but in no event after the Final Exercise Date), provided that this option shall be exercisable only to the extent that the Participant was entitled to exercise this option on the date of such cessation. Notwithstanding the foregoing, if the Participant, prior to the Final Exercise Date, violates the non-competition or confidentiality provisions of any employment contract, confidentiality and nondisclosure agreement or other agreement between the Participant and the Company, the right to exercise this option shall terminate immediately upon such violation.

(d) Exercise Period Upon Death or Disability. If the Participant dies or becomes disabled (within the meaning of Section 22(e)(3) of the Code) prior to the Final Exercise Date while he or she is an Eligible Participant and the Company has not terminated such relationship for "cause" as specified in paragraph (e) below, this option shall be exercisable, within the period of one year following the date of death or disability of the Participant, by the Participant (or in the case of death by an authorized transferee), provided that this option shall be exercisable only to the extent that this option was exercisable by the Participant on the date of his or her death or disability, and further provided that this option shall not be exercisable after the Final Exercise Date.

(e) Discharge for Cause. If the Participant, prior to the Final Exercise Date, is discharged by the Company for "cause" (as defined below), the right to exercise this option shall terminate immediately upon the effective date of such discharge. "Cause" shall mean willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, breach by the Participant of any provision of any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), as determined by the Company, which determination shall be conclusive. The Participant shall be considered to have been discharged for "Cause" if the Company determines, within 30 days after the Participant's resignation, that discharge for cause was warranted.

4. Tax Matters.

(a) Withholding. No Shares will be issued pursuant to the exercise of this option unless and until the Participant pays to the Company, or makes provision satisfactory to the Company for payment of, any federal, state or local withholding taxes required by law to be withheld in respect of this option.

(b) Disqualifying Disposition. If the Participant disposes of Shares acquired upon exercise of this option within two years from the Grant Date or one year after such Shares were acquired pursuant to exercise of this option, the Participant shall notify the Company in writing of such disposition.

5. Nontransferability of Option.

This option may not be sold, assigned, transferred, pledged or otherwise encumbered by the Participant, either voluntarily or by operation of law, except by will or the laws of descent

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and distribution, and, during the lifetime of the Participant, this option shall be exercisable only by the Participant.

6. Provisions of the Plan.

This option is subject to the provisions of the Plan, a copy of which is furnished to the Participant with this option.

IN WITNESS WHEREOF, the Company has caused this option to be executed under its corporate seal by its duly authorized officer. This option shall take effect as a sealed instrument.

ALNYLAM PHARMACEUTICALS, INC.

Dated: _________                     By: ____________________________________

                                          Name: _____________________________
                                          Title: ____________________________

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PARTICIPANT'S ACCEPTANCE

The undersigned hereby accepts the foregoing option and agrees to the terms and conditions thereof. The undersigned hereby acknowledges receipt of a copy of the Company's 2004 Stock Incentive Plan.

PARTICIPANT:

Address: _________________________


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ALNYLAM PHARMACEUTICALS, INC.

Nonstatutory Stock Option Agreement
Granted Under 2004 Stock Incentive Plan

1. Grant of Option.

This agreement evidences the grant by Alnylam Pharmaceuticals, Inc., a Delaware corporation (the "Company"), on ________, 200[ ] (the "Grant Date") to
[________], an [employee], [consultant], [director] of the Company (the "Participant"), of an option to purchase, in whole or in part, on the terms provided herein and in the Company's 2004 Stock Incentive Plan (the "Plan"), a total of [____] shares (the "Shares") of common stock, $.01 par value per share, of the Company ("Common Stock") at $[_____] per Share. Unless earlier terminated, this option shall expire at 5:00 p.m., Eastern time, on [the date that is ten years from the Grant Date] (the "Final Exercise Date").

It is intended that the option evidenced by this agreement shall not be an incentive stock option as defined in Section 422 of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the "Code"). Except as otherwise indicated by the context, the term "Participant", as used in this option, shall be deemed to include any person who acquires the right to exercise this option validly under its terms.

2. Vesting Schedule.

This option will become exercisable ("vest") as to [____________________].

The right of exercise shall be cumulative so that to the extent the option is not exercised in any period to the maximum extent permissible it shall continue to be exercisable, in whole or in part, with respect to all Shares for which it is vested until the earlier of the Final Exercise Date or the termination of this option under Section 3 hereof or the Plan.

3. Exercise of Option.

(a) Form of Exercise. Each election to exercise this option shall be in writing, signed by the Participant, and received by the Company at its principal office, accompanied by this agreement, and payment in full in the manner provided in the Plan. The Participant may purchase less than the number of shares covered hereby, provided that no partial exercise of this option may be for any fractional share or for fewer than ten whole shares.

(b) Continuous Relationship with the Company Required. Except as otherwise provided in this Section 3, this option may not be exercised unless the Participant, at the time he or she exercises this option, is, and has been at all times since the Grant Date, an [employee or officer of], or consultant or advisor to, the Company or any other entity the employees, officers, directors, consultants, or advisors of which are eligible to receive option grants under the Plan (an "Eligible Participant").

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(c) Termination of Relationship with the Company. If the Participant ceases to be an Eligible Participant for any reason, then, except as provided in paragraphs (d) and (e) below, the right to exercise this option shall terminate three months after such cessation (but in no event after the Final Exercise Date), provided that this option shall be exercisable only to the extent that the Participant was entitled to exercise this option on the date of such cessation. Notwithstanding the foregoing, if the Participant, prior to the Final Exercise Date, violates the non-competition or confidentiality provisions of any employment contract, confidentiality and nondisclosure agreement or other agreement between the Participant and the Company, the right to exercise this option shall terminate immediately upon such violation.

(d) Exercise Period Upon Death or Disability. If the Participant dies or becomes disabled (within the meaning of Section 22(e)(3) of the Code) prior to the Final Exercise Date while he or she is an Eligible Participant and the Company has not terminated such relationship for "cause" as specified in paragraph (e) below, this option shall be exercisable, within the period of one year following the date of death or disability of the Participant, by the Participant (or in the case of death by an authorized transferee), provided that this option shall be exercisable only to the extent that this option was exercisable by the Participant on the date of his or her death or disability, and further provided that this option shall not be exercisable after the Final Exercise Date.

(e) Discharge for Cause. If the Participant, prior to the Final Exercise Date, is discharged by the Company for "cause" (as defined below), the right to exercise this option shall terminate immediately upon the effective date of such discharge. "Cause" shall mean willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, breach by the Participant of any provision of any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), as determined by the Company, which determination shall be conclusive. The Participant shall be considered to have been discharged for "Cause" if the Company determines, within 30 days after the Participant's resignation, that discharge for cause was warranted.

4. Withholding.

No Shares will be issued pursuant to the exercise of this option unless and until the Participant pays to the Company, or makes provision satisfactory to the Company for payment of, any federal, state or local withholding taxes required by law to be withheld in respect of this option.

5. Nontransferability of Option.

This option may not be sold, assigned, transferred, pledged or otherwise encumbered by the Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution, and, during the lifetime of the Participant, this option shall be exercisable only by the Participant.

6. Provisions of the Plan.

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This option is subject to the provisions of the Plan, a copy of which is furnished to the Participant with this option.

IN WITNESS WHEREOF, the Company has caused this option to be executed under its corporate seal by its duly authorized officer. This option shall take effect as a sealed instrument.

ALNYLAM PHARMACEUTICALS, INC.

Dated: _________                    By: ____________________________________

                                         Name: _____________________________
                                         Title: ____________________________

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PARTICIPANT'S ACCEPTANCE

The undersigned hereby accepts the foregoing option and agrees to the terms and conditions thereof. The undersigned hereby acknowledges receipt of a copy of the Company's 2004 Stock Incentive Plan.

PARTICIPANT:


Address: _________________________


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EXHIBIT 10.6

AMENDMENT NO. 01

Dated August 2, 2004

TO

that certain Loan and Security Agreement No. 3861 dated as of March 26, 2004 ("Loan Agreement") by and between LIGHTHOUSE CAPITAL PARTNERS V, L.P.
("Lender") and ALNYLAM PHARMACEUTICALS, INC., ("Borrower").

(All capitalized terms not otherwise defined herein shall have the meanings given to such terms in the Loan Agreement.)

Without limiting or amending any other provisions of the Loan Agreement, Lender and Borrower agree to the following:

SECTION 1.1 - The definition of "Basic Rate" shall be deleted and replaced with the following:

"Basic Rate" means a per annum rate of interest (based on a year of three hundred and sixty (360) days and actual days elapsed) equal to the Prime Rate as quoted in the western edition of The Wall Street Journal plus 300 basis points.

SECTION 2.3(b) - This section shall be deleted and replaced with the following:

LOAN INTEREST RATE. Borrower shall pay interest on each Loan from the Funding Date until such Loan has been paid in full, at a per annum rate of interest equal to the Basic Rate. The Basic Rate applicable to each Loan shall be initially determined on the Funding Date and will thereafter be recalculated (if necessary) on the first day of each month during the Interim Payment period. On the Loan Commencement Date, the Basic rate applicable to each Loan shall be fixed and shall not be subject to change in the absence of a manifest error. All computations of interest on each Loan shall be based on a year of three hundred and sixty (360) days for actual days elapsed. Notwithstanding any other provision hereof, the amount of interest payable hereunder shall not in any event exceed the maximum amount permitted by the law applicable to interest charged on commercial loans.

SECTION 11 - The addresses for notices to the Borrower shall be deleted and replaced with the following:

If to Borrower:       Alnylam Pharmaceuticals, Inc.
                      300 Third Street
                      Cambridge, MA 02142
                      Attention: Chief Financial Officer
                      FAX: (617) 551-8101

With a copy to:       Faber Daeufer & Rosenberg PC
                      One Broadway, 14th Floor
                      Cambridge, MA 02142
                      Attention: Joseph L. Faber
                      FAX: (617) 507-5858


Except as amended hereby, the Loan Agreement shall remain unmodified and unchanged.

BORROWER:                                LENDER:

ALNYLAM PHARMACEUTICALS, INC.            LIGHTHOUSE CAPITAL PARTNERS V, L.P.

By: /s/ David Neafus                     By: LIGHTHOUSE MANAGEMENT
    ----------------------------------       PARTNERS V, L.L.C., its general
                                             partner
Name: David Neafus

Title: Interim Vice President, Finance   By: /s/ Thomas Conneely
                                             ----------------------------------

                                         Name: Thomas Conneely

                                         Title: Vice President


EXHIBIT 10.8

AGREEMENT

(THE "REQUIREMENT AMENDMENT")

between

GARCHING INNOVATION GMBH MUNICH, GERMANY

("GI")

and

ALNYLAM PHARMACEUTICALS, INC., CAMBRIDGE, USA (FORMERLY KNOWN AS ALNYLAM HOLDING
CO., INC.)

("Alnylam Pharma")

and

ALNYLAM US, INC., CAMBRIDGE, USA (FORMERLY KNOWN AS ALNYLAM PHARMACEUTICALS,
INC.)

("Alnylam US")

and

ALNYLAM EUROPE AG, KULMBACH, GERMANY (FORMERLY KNOWN AS RIBOPHARMA AG)

("Alnylam Germany")

(GI, Alnylam Pharma, Alnylam US and Alnylam Germany are hereinafter referred to as the "Parties")


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PREAMBLE

WHEREAS, Alnylam US and GI are parties to the Alnylam Co-Exclusive License Agreement dated as of December 20, 2002 (the "Alnylam License Agreement"), pursuant to which Alnylam US received one of two proposed co-exclusive licenses from GI to the patents described therein;

WHEREAS, Max Planck Gesellschaft zur Foerderung der Wissenschaften e.V. ("MPG"), co-owner of the patents licensed under the Alnylam License Agreement (and only MPG but none of the other co-owners of the licensed patents), established the requirement to develop and commercialize the licensed patents also in Germany, due to the fact that Tom Tuschl, a main inventor of the licensed patents, made his inventions at a Max Planck Institute in Germany in the course of a project funded by the German government; MPG (and only MPG but none of the other co-owners of the licensed patents) requested from GI to negotiate and implement in the respective agreements a Comparability Requirement (as defined below) and a Split of Indications Requirement (as defined below);

WHEREAS, the Alnylam License Agreement provides for the grant of a second co-exclusive license to a European-based therapeutics company consisting of, among other things, a German company that must have comparable operational forces in terms of budget, employees, R&D and BD capacities as Alnylam US ("Europe RNAi") to be established by Alnylam US;

WHEREAS, Alnylam US and Alnylam Germany entered into a share exchange agreement dated as of July 3, 2003 (the "Share Exchange Agreement") pursuant to which both entities became wholly-owned subsidiaries of Alnylam Pharma;

WHEREAS, the equity ownership structure provided for under the Share Exchange Agreement did not comply with certain of the requirements set forth in Appendix C of the Alnylam License Agreement;

WHEREAS, under an Amendment to the Alnylam License Agreement dated as of July 2, 2003 (the "Garching Amendment"), GI agreed that Alnylam Germany qualifies as Europe RNAi as described in the Alnylam License Agreement, provided that, among other terms and conditions set forth in the Garching Amendment, for a period of 5 years after the effective date as defined in the Alnylam License Agreement (i) Alnylam Pharma is required to use reasonable commercial efforts to build for Alnylam Germany capabilities to develop, make, use, sell or import license products comparable to Alnylam US and (ii) Alnylam Germany must have comparable operational forces in Germany in terms of budget, employees, research and development and business development capabilities as Alnylam US (conditions (i) and (ii) above are hereinafter jointly referred to as the "Comparability Requirement");

Requirement Amendment
Execution Copy


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WHEREAS, GI and Alnylam Germany are parties to a Ribopharma Co-Exclusive License Agreement dated as of July 30, 2003 (the "Ribopharma License Agreement") pursuant to which GI granted a second co-exclusive license to Alnylam Germany (formerly known as Ribopharma AG);

WHEREAS, under Section 2.3 of each the Alnylam License Agreement and the Ribopharma License Agreement, Alnylam US, Alnylam Germany and GI have undertaken to mutually agree on a reasonable and equal split of indications and sub-indications according to the estimated market size and accessibility by RNAi within the field between Alnylam US and Alnylam Germany (hereinafter referred to as the "Split of Indications Requirement");

WHEREAS, Alnylam US and Alnylam Germany issued to GI a confidential report dated as of January 10, 2005, pursuant to which Alnylam US and Alnylam Germany asserted their compliance with the Comparability Requirement and the Split of Indications Requirement;

WHEREAS, on January 20, 2005 GI issued to Alnylam US and Alnylam Germany a deficiency notice regarding the Comparability Requirement, according to Section
C) 5.c) of the Garching Amendment (the "Deficiency Notice"), and an insufficiency notice regarding the Split of Indications Requirement according to
Section 2.3 of the Alnylam License Agreement and Section 2.3 of the Ribopharma License Agreement (the "Insufficiency Notice"); and

WHEREAS, without prejudice to, and/or acknowledging any default under, any of the contractual obligations described above, the Parties engaged into further discussions intended to reach amicable agreement with respect to the matters cited below and to settle any controversy arising out of the Comparability Requirement and the Split of Indications Requirement;

NOW THEREFORE, the Parties agree with respect to the foregoing as follows:

1. Alnylam Pharma, Alnylam US, Alnylam Germany and GI agree that with respect to the scope, content, reporting, failure, cure and termination procedure, and any other terms and conditions (including without limitation Sections
A) 1., A) 3. d), and C) 5. a) through c) of the Garching Amendment) in connection with the Comparability Requirement set forth in the Alnylam License Agreement, the Garching Amendment and the Ribopharma License Agreement as well as the requirements set out in Sec. 10.2 of the Share Exchange Agreement (collectively, the "Comparability Requirement Terms and Conditions"), the Comparability Requirement Terms and Conditions shall be amended as follows (the amended Comparability Requirement Terms and Conditions set forth in (i) through (vi) below collectively the "Amended Comparability Requirement Terms and Conditions"):

Requirement Amendment
Execution Copy


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(i) For a period until December 20, 2007 (the "Period"), Alnylam Pharma (or any successor or assignee of Alnylam Pharma) is obliged to maintain Alnylam Germany as an operating company in Germany with at least a number of employees collectively equal to 25 full-time equivalent employees ("FTEs") (such number may include the management of Alnylam Germany and incoming employees who have signed their employment contracts with Alnylam Germany but have not yet commenced their employment) having their legal and habitual residence in Germany and working at least 75% of their working time in Germany, and

(ii) Alnylam Pharma (or any successor or assignee of Alnylam Pharma) shall ensure for the Period that 10 of the 25 FTEs as defined under (i) above are scientists with at least a doctoral-level degree, and a further 4 of these 25 FTEs are diploma scientists ("Academic Quota"), unless the Parties have agreed on a different Academic Quota, it being understood that Alnylam Pharma may propose - at any time - adjustments to the Academic Quota subject to GI's approval, which approval shall not be unreasonably withheld by GI, provided that Alnylam Pharma has given sufficient reasons for its proposed adjustments.

(iii) Alnylam Pharma (or any successor or assignee of Alnylam Pharma) shall provide GI, within 30 days after the end of each calendar quarter, with calendar quarterly reports (the "Reports") showing in sufficient detail how Alnylam Pharma has fulfilled during the immediately preceding calendar quarter and intends to fulfil in the calendar quarter in which the respective Report is submitted, its obligations set forth in (i) and
(ii) above; the first Report shall be delivered to GI for the first calendar quarter 2005, and

(iv) In the event GI informs Alnylam Pharma in writing, within 30 (thirty) days after receipt of the respective Report, that Alnylam Pharma failed to comply with one or more of its obligations set forth in (i) and (ii) above (the "Failure Notice"), and Alnylam Pharma fails to cure that breach within 90 days after receiving the Failure Notice or, if such breach is the result of one or more employees leaving their employment with Alnylam Germany, within 180 days after the final date of employment of such employee, whichever period is longer ("Grace Period"), GI shall have the extraordinary right, but subject to the procedure set forth in clause 1(v) below, to terminate the Ribopharma License Agreement in writing with 30 days prior notice to Alnylam Pharma. In the event of such termination, Sections 11.7, 11.8 and 12.3 of the Ribopharma License Agreement shall not apply, and such termination of the Ribopharma License Agreement shall be GI's sole remedy under any or all of this Requirement Amendment, the Ribopharma License Agreement, the Alnylam License Agreement and the Garching Amendment for failure by Alnylam Pharma (or any successor or Assignee of Alnylam Pharma) to comply with the obligations set forth in 1(i) and 1(ii) above.

Requirement Amendment
Execution Copy


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(v) Within 30 days after the end of the Grace Period, Alnylam Pharma may provide written notice to GI in sufficient detail to demonstrate that the Amended Comparability Requirement Terms and Conditions were fulfilled within the Grace Period, or, despite diligent efforts to fulfill them, were not fulfilled within the Grace Period for reasons outside the reasonable control of Alnylam Pharma, e.g. because it has not been possible within such Grace Period to recruit an appropriate individual for a vacant position. In the event that, after giving reasonable consideration to such written notice from Alnylam, GI does not agree that Alnylam Pharma has fulfilled, or used diligent efforts to fulfill, the Amended Comparability Requirement Terms and Conditions within the Grace Period, GI shall have the right to seek termination of the Ribopharma License Agreement by initiating arbitration in accordance with Section 12.3 of the Ribopharma License Agreement, with the following modifications:

(a) the only matter on which the arbitrators will be asked to rule is whether Alnylam Pharma has met, or has used diligent efforts to meet, the Amended Comparability Requirement Terms and Conditions;

(b) if the arbitrators rule that Alnylam Pharma has met, or has used diligent efforts to meet, the Amended Comparability Requirement Terms and Conditions, GI shall not have the right to terminate the Ribopharma License Agreement and shall bear all costs of the arbitration; and

(c) if the arbitrators rule that Alnylam Pharma has not met, or has not used diligent efforts to meet, the Amended Comparability Requirement Terms and Conditions, GI shall have the right to terminate the Ribopharma License Agreement immediately, and Alnylam Pharma shall bear all costs of the arbitration.

(vi) GI shall herewith waive and Alnylam Pharma, Alnylam US and Alnylam Germany shall herewith accept such waiver of any and all rights including but not limited to any right of GI to terminate the Alnylam License Agreement and/or the Ribopharma License Agreement based on an asserted default under the Comparability Requirement Terms and Conditions.

2. Alnylam Pharma, Alnylam US, Alnylam Germany and GI agree that with respect to the Split of Indications Requirement set forth in the Alnylam License Agreement and the Ribopharma License Agreement (i) Alnylam US and Alnylam Germany shall be fully and irrevocably released from the Split of Indications Requirement and all and any pending, threatened or asserted claims arising out of any asserted default under the Split of Indications Requirement, and (ii) GI shall herewith waive and Alnylam Pharma, Alnylam US and Alnylam Germany shall herewith accept such waiver of any and all rights including but not limited to any

Requirement Amendment
Execution Copy


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right of GI to terminate the Alnylam License Agreement and/or the Ribopharma License Agreement based on an asserted default under the Split of Indications Requirement.

3. Alnylam Pharma, Alnylam US, Alnylam Germany and GI agree that in each of the Alnylam License Agreement and the Ribopharma License Agreement,
Section 4.2 shall be amended to read as follows:

"COMPANY shall furnish, and shall oblige its AFFILIATES and SUBLICENSEES to furnish to COMPANY for inclusion in its reports to GI, to GI in writing, within 30 (thirty) days after the end of each calendar year, with COMPANY's standard R&D report, on the progress of its efforts during the immediately preceding calendar year to develop and commercialize LICENSED PRODUCTS for each indication and sub-indication within the FIELD. The report shall also contain a discussion of intended R&D efforts for the calendar year in which the report is submitted."

4. Alnylam Pharma, Alnylam US, Alnylam Germany and GI agree that in each of the Alnylam License Agreement and the Ribopharma License Agreement, the final paragraph of Section 4.3 shall be amended to read as follows:

"If GI decides that COMPANY did not fulfill the requirements of (a) or (b), and/or that COMPANY's terms and conditions for the requested sublicense have been unreasonable (in either case, a "Sublicensing Deficiency"), GI may provide COMPANY with notice in writing ("Sublicensing Deficiency Notice") of such decision. Within thirty
(30) days of receiving such Sublicensing Deficiency Notice, COMPANY shall provide GI within a written reply proposing a plan to correct such Sublicensing Deficiency, and/or explaining COMPANY's reasonable belief that no such Sublicensing Deficiency exists. If COMPANY does not provide a written reply to GI within thirty (30) days after receiving such Sublicensing Deficiency Notice, or if after giving such reply due consideration, including discussing such reply with COMPANY, GI reasonably concludes that such Sublicensing Deficiency does exist and/or that COMPANY's proposed corrective plan is inadequate, GI may initiate the arbitration procedure according to
Section 12.3. If the award of the arbitration tribunal states a non-fulfillment of the requirements of (a) or (b), COMPANY shall immediately start negotiations with the third party; if the award of the arbitration tribunal states unreasonable terms and conditions, COMPANY shall immediately re-negotiate reasonable terms and conditions with the third party. In any such awards of the arbitration tribunal, the costs for the arbitration procedure shall be borne solely by COMPANY."

Requirement Amendment
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5. In consideration for the agreements of GI set out in paragraphs 1 through 4 above, Alnylam Pharma shall issue and transfer, within 30 days after the Amendment Execution Date, a total of 270,000 (two hundred seventy thousand) fully-paid shares of Alnylam Pharma Common Stock, such shares to be free of any restrictions on transfer other than any restrictions required under applicable U.S. securities laws (the "Compensation Shares"). The Compensation Shares shall be distributed in accordance with written instructions (the "Distribution Instructions") to be provided by GI to Alnylam Pharma within 5 days after the Amendment Execution Date, instructing Alnylam Pharma to issue and transfer such Compensation Shares either

(i) in total to MPG, in which case it shall be GI's sole and exclusive responsibility to split the Compensation Shares and to cause MPG to assign and transfer any part of the Compensation Shares to any of the Massachusetts Institute of Technology ("MIT") and/or the Whitehead Institute ("WI") (MIT, WI and MPG collectively the "Approving Owners" as defined in the Ribopharma License Agreement). In such case, however, Alnylam Pharma shall diligently assist and support MPG in connection with any further assignment and transfer of any portion of the Compensation Shares; in particular, Alnylam Pharma shall, and, as necessary or useful, shall instruct its respective consultants or agents (e.g., EquiServe Trust) to, execute any documents or take any other action required under applicable U.S. securities law in order to implement any further assignment and transfer of any portion of the Compensation Shares in the most expeditious manner;

or

(ii) in portions to the Approving Owners in accordance with a share distribution scheme set forth by GI in the Distribution Instructions.

The Distribution Instructions shall also include written confirmation from each Approving Owner that it approves this Requirement Amendment.

MPG (or any of its successors or assignees) and the Approving Owners shall be and remain the owner of the Compensation Shares, including without limitation in the event that this Requirement Amendment or any of the Alnylam License Agreement, the Garching Amendment or the Ribopharma License Agreement is terminated.

6. GI shall represent and warrant that it has the right and authority to enter into this Requirement Amendment and that such Requirement Agreement, in particular the Amended Comparability Requirement Terms and Conditions and the release from the Split of Indications Requirements as agreed in this Requirement Amendment, does not conflict with any rights and claims of third parties, in particular of the

Requirement Amendment
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Approving Owners. GI shall defend, indemnify and hold harmless Alnylam Pharma, Alnylam US and Alnylam Germany, as well as its directors and officers against any claims of third parties, in particular the Approving Owners, irrespective on what basis, against Alnylam Pharma, Alnylam US and/or Alnylam Germany because of this Requirement Amendment or any of the Amended Comparability Requirement Terms and Conditions or the release from the Split of Indications Requirement as agreed in this Requirement Amendment.

7. This Requirement Amendment shall come into effect on June 15, 2005 (the "Amendment Execution Date") and shall remain in effect for the term of the Alnylam License Agreement and the Ribopharma License Agreement. Until the Amendment Execution Date, GI herewith agreed to suspend the Deficiency Notice and the Insufficiency Notice.

8. This Requirement Amendment shall be governed by and construed in accordance with the laws of Federal Republic of Germany. Any controversy arising out of or in connection with this Requirement Amendment shall be subject to arbitration under the procedural Rules of the International Chamber of Commerce. The arbitration tribunal shall be appointed as follows: GI, on the one hand, and collectively Alnylam Pharma, Alnylam US and Alnylam Germany, on the other hand, shall each select, within 30 (thirty) days after receipt of notice that arbitration is initiated, an independent and experienced third party as arbitrator. Such two selected arbitrators shall mutually select an independent and experienced third party as third arbitrator. The venue for such arbitration procedure shall be Munich, Germany, the language shall be English. The award of the arbitration shall be final and binding for the parties. Notwithstanding the foregoing, each party may apply for interlocutory relief in court.

9. This Requirement Amendment may be executed in separate counterparts, each of which is deemed to be an original and all of which taken together constitute one and the same instrument.

In witness thereof the parties have caused this agreement to be executed by their duly authorized representatives.

Garching Innovation GmbH

By: /s/ Dr. Bernhard Hertel
    -------------------------------------
Name: Dr. Bernhard Hertel
Title: Geschaftsfuhrer/Managing Director
Date: June 14, 2005

Requirement Amendment
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Alnylam Pharmaceuticals, Inc.

By: /s/ Barry Greene
    ----------------------------
Name: Barry Greene
Title: Chief Operating Officer
Date: June 7, 2005

Alnylam US, Inc.

By: /s/ Vincent J. Miles
    ----------------------------
Name: Vincent J. Miles
Title: Sr. Vice President Business Development
Date: June 7, 2005

Alnylam Europe AG

By: /s/ Roland Kreutzer
    ------------------------------
Name: Roland Kreutzer
Title: Managing Director
Date: June 13, 2005

Alnylam Europe AG

By: /s/ Andreas Bossko
    -----------------------
Name: Andreas Bossko
Title: Vice President, Finance
Date: June 13, 2005

Requirement Amendment
Execution Copy


EXHIBIT 31.1

CERTIFICATION

I, John M. Maraganore, Ph.D., certify that:

1) I have reviewed this Quarterly Report on Form 10-Q of Alnylam Pharmaceuticals, Inc.;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) [Paragraph omitted in accordance with SEC transition instructions contained in SEC Release 34-47986]

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5) The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 11, 2005                    /s/  John M. Maraganore, Ph.D.
                                         --------------------------------------
                                         John M. Maraganore, Ph.D.
                                         President and Chief Executive Officer


EXHIBIT 31.2

CERTIFICATION

I, Barry E. Greene, certify that:

1) I have reviewed this Quarterly Report on Form 10-Q of Alnylam Pharmaceuticals, Inc.;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) [Paragraph omitted in accordance with SEC transition instructions contained in SEC Release 34-47986]

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5) The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 11, 2005                    /s/  Barry E. Greene
                                         ---------------------------------------
                                         Barry E. Greene
                                         Chief Operating Officer and Treasurer


EXHIBIT 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT
TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Alnylam Pharmaceuticals, Inc. (the "Company") for the fiscal quarter ended June 30, 2005 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), the undersigned, John M. Maraganore, Ph.D., President and Chief Executive Officer of the Company, hereby certifies, pursuant to Section 1350 of Chapter 63 of Title 18, United States Code, that:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: August 11, 2005                   /s/  John M. Maraganore, Ph.D.
                                         --------------------------------------
                                         John M. Maraganore, Ph.D.
                                         President and Chief Executive Officer


EXHIBIT 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT
TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Alnylam Pharmaceuticals, Inc. (the "Company") for the fiscal quarter ended June 30, 2005 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), the undersigned, Barry E. Greene, Chief Operating Officer and Treasurer of the Company, hereby certifies, pursuant to Section 1350 of Chapter 63 of Title 18, United States Code, that:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: August 11, 2005                   /s/  Barry E. Greene
                                         ---------------------------------------
                                         Barry E. Greene
                                         Chief Operating Officer and Treasurer