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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

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For the quarterly period ended March 31, 2022

or

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For the transition period from to

Commission file number: 001-34475

OMEROS CORPORATION

(Exact name of registrant as specified in its charter)

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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 ⌧ No ◻

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ⌧ No ◻

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ⌧

As of May 6, 2022, the number of outstanding shares of the registrant’s common stock, par value $0.01 per share, was 62,730,015.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934 (the “Exchange Act”), which are subject to the “safe harbor” created by those sections for such statements. Forward-looking statements are based on our management’s beliefs and assumptions and on currently available information. All statements other than statements of historical fact are “forward-looking statements.” Terms such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “goal,” “intend,” “likely,” “may,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “target,” “will,” “would,” and similar expressions and variations thereof are intended to identify forward-looking statements, but these terms are not the exclusive means of identifying such statements. Examples of these statements include, but are not limited to, statements regarding:

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Our actual results could differ materially from those anticipated in these forward-looking statements for many reasons, including the risks, uncertainties and other factors described in this Quarterly Report on Form 10-Q under the headings “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in our other filings with the U.S. Securities and Exchange Commission (the “SEC”). Given these risks, uncertainties and other factors, actual results or anticipated developments may not be realized or, even if substantially realized, may not have the expected consequences to or effects on our company, business or operations. Accordingly, you should not place undue reliance on these forward-looking statements, which represent our estimates and assumptions only as of the date of the filing of this Quarterly Report on Form 10-Q. You should read this Quarterly Report on Form 10-Q completely and with the understanding that our actual results in subsequent periods may materially differ from current expectations. Except as required by applicable law, we assume no obligation to update or revise any forward-looking statements contained herein, whether as a result of any new information, future events or otherwise.

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OMEROS CORPORATION

FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2022

INDEX

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See accompanying Notes to Condensed Consolidated Financial Statements

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See accompanying Notes to Condensed Consolidated Financial Statements

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See accompanying Notes to Condensed Consolidated Financial Statements

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OMEROS CORPORATION

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(“GAAP”). Certain prior year amounts in the condensed consolidated balance sheets, statements of operations, statements of stockholders’ equity (deficit) and statements of cash flows and the notes to the condensed consolidated financial statements have been reclassified in the condensed consolidated financial statements to conform to the current year presentation.

Risks and Uncertainties

As of March 31, 2022, we had cash, cash equivalents and short-term investments of $142.2 million and outstanding accounts receivable of $16.3 million. Our loss for the quarter ended March 31, 2022 was $33.0 million and included $4.2 million of noncash operating expenses.

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We plan to continue to fund our operations for the next twelve months with our existing cash and investments, our current accounts receivable, and OMIDRIA royalties. There is also the potential for us to receive a $200.0 million milestone related to achievement of long-term OMIDRIA separate payment. If FDA approval is granted for narsoplimab for HSCT-TMA within the next twelve months, we expect that sales of narsoplimab will also provide funds for our operations. We have a sales agreement to sell shares of our common stock, from time to time, in an “at the market” equity offering facility through which we may offer and sell shares of our common stock equaling an aggregate amount up to $150.0 million. Should it be determined to be strategically advantageous, we could pursue debt financings as well as public and private offerings of our equity securities, similar to those we have previously completed, or other strategic transactions, which may include licensing a portion of our existing technology.

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Management believes the assets on hand along with expected royalties received are adequate to finance our operations at least through May 10, 2023. Accordingly, the accompanying condensed consolidated financial statements have been prepared on a going-concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business.

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Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant items subject to such estimates include OMIDRIA contract royalty asset valuation, stock-based compensation expense, and accruals for clinical trials and manufacturing of drug product. We base our estimates on historical experience and on various other factors, including the impact of the COVID-19 pandemic, that we believe are reasonable under the circumstances; however, actual results could differ from these estimates.

Note 2—Significant Accounting Policies

Discontinued Operations

We review the presentation of planned or completed business dispositions in the condensed consolidated financial statements based on the available information and events that have occurred. The review consists of evaluating whether the business meets the definition of a component for which the operations and cash flows are clearly distinguishable from the other components of the business and, if so, whether it is anticipated that after the disposal the cash flows of the component would be eliminated from continuing operations and whether the disposition represents a strategic shift that has a major effect on operations and financial results.

Planned or completed business dispositions are presented as discontinued operations when all the criteria described above are met. For those divestitures that qualify as discontinued operations, all comparative periods presented are reclassified in the consolidated balance sheets. Additionally, the results of operations of a discontinued operation are reclassified to income from discontinued operations, for all periods presented in the condensed consolidated statements of operations and comprehensive loss. Results of discontinued operations include all revenues and expenses directly derived from such businesses; general corporate overhead is not allocated to discontinued operations. The OMIDRIA asset sale to Rayner qualifies as a discontinued operation. The Company included information regarding cash flows from discontinued operations (see “Note 3 – Discontinued Operations”).

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OMIDRIA Royalties and OMIDRIA Contract Royalty Assets

We have rights to receive future royalties from Rayner on OMIDRIA net sales at rates that vary based on geography and certain regulatory contingencies. Therefore, future OMIDRIA royalties are treated as variable consideration. The sale of OMIDRIA qualified as an asset sale under GAAP. To measure the OMIDRIA contract royalty asset, we used the expected value approach which is the sum of the discounted probability-weighted royalty payments, net of tax, we would receive using a range of potential outcomes, to the extent that it is probable that a significant reversal in the amount of cumulative income recognized will not occur. Accordingly, the contract royalty asset excludes the achievement of the $200.0 million milestone payment and any foreign royalties to the extent it is probable that a significant reversal in the amount of cumulative income recognized will not occur. Royalties earned will primarily be recorded as a reduction to the OMIDRIA contract royalty asset. The amount recorded in discontinued operations will reflect interest earned on the outstanding OMIDRIA contract royalty asset and any amounts received that are different from the expected royalties recorded at closing. The OMIDRIA contract royalty asset will also be re-measured periodically using the expected value approach based on actual results and future expectations. Any required adjustment to the OMIDRIA contract royalty asset will be recorded into discontinued operations.

OMIDRIA Revenue Recognition

Prior to the sale of OMIDRIA on December 23, 2021, when we entered into a customer contract, we performed the following five steps: (i) identified the contract with a customer; (ii) identified the performance obligations in the contract; (iii) determined the transaction price; (iv) allocated the transaction price to the performance obligations in the contract; and (v) recognized revenue when (or as) we satisfy a performance obligation.

We generally recorded OMIDRIA product sales when the product was delivered to our wholesalers. OMIDRIA product sales were recorded net of wholesaler distribution fees and estimated chargebacks, rebates, returns and purchase-volume discounts. Accruals or allowances were established for these deductions in the same period when revenue was recognized, and actual amounts incurred were offset against the applicable accruals or allowances. We reflected each of these accruals or allowances as either a reduction in the related accounts receivable or as an accrued liability, depending on how the amount is expected to be settled.

Inventory

We expense inventory costs related to product candidates as research and development expenses until regulatory approval is reasonably assured in the U.S. or the European Union (the “EU”). Once approval is reasonably assured, costs including amounts related to third-party manufacturing, transportation and internal labor and overhead will be capitalized.

Right of Use Assets and Related Lease Liabilities

We record operating leases as right-of-use assets and recognize the related lease liabilities equal to the fair value of the lease payments using our incremental borrowing rate when the implicit rate in the lease agreement is not readily available. We recognize variable lease payments, when incurred. Costs associated with operating lease assets are recognized on a straight-line basis within operating expenses over the term of the lease.

We record finance leases as a component of property and equipment and amortize these assets within operating expenses on a straight-line basis to their residual values over the shorter of the term of the underlying lease or the estimated useful life of the equipment. The interest component of a finance lease is included in interest expense and recognized using the effective interest method over the lease term.

We account for leases with initial terms of 12 months or less as operating expenses on a straight-line basis over the lease term.

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Stock-Based Compensation

Stock-based compensation expense is recognized for all share-based payments based on estimated fair values. The fair value of our stock options is calculated using the Black-Scholes option-pricing model which requires judgmental assumptions around volatility, forfeiture rates and expected option term. Compensation expense is recognized over the optionees’ requisite service periods, which is generally the vesting period, using the straight-line method. Forfeiture expense is estimated at the time of grant and revised in subsequent periods if actual forfeitures differ from those estimates.

Income Taxes

Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their tax bases. Deferred tax assets and liabilities are measured using enacted tax rates applied to taxable income in the years in which those temporary differences are expected to be recovered or settled. We recognize the effect of income tax positions only if those positions are more likely than not of being sustained upon an examination. A valuation allowance is established when it is more likely than not that the deferred tax assets will not be realized.

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Note 3—Discontinued Operations

On December 23, 2021, we completed the sale of OMIDRIA and certain related assets including inventory and prepaid expenses. We retained the outstanding accounts receivable and all outstanding liabilities related to OMIDRIA as of the closing date.

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Upon closing, we received an up-front cash payment of $126.0 million. We receive a 50% royalty on OMIDRIA net sales in the U.S. until the earlier of January 1, 2025 or the payment of the $200.0 million milestone described below. After such date, we will receive a 30% royalty on OMIDRIA net sales in the U.S. (the “U.S. base royalty rate”) until the expiration or termination of the last issued and unexpired U.S. patent. The U.S. base royalty rate is reduced to 10% upon the occurrence of certain events described in the Asset Purchase Agreement, including during any specific period in which OMIDRIA is no longer eligible for separate payment. We will also receive a royalty of 15% on OMIDRIA net sales outside the U.S. on a country-by-country basis until the expiration or termination of the last issued and unexpired OMIDRIA patent in such country. We will receive a $200.0 million milestone payment if, prior to January 1, 2025, separate payment for OMIDRIA is secured in the U.S. for a continuous period of at least four years.

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During the three months ended March 31, 2022, we earned royalties of $13.8 million on sales of OMIDRIA which we recorded as a reduction to the OMIDRIA contract royalty asset. We also recorded $7.0 million of income in discontinued operations representing interest income and remeasurement adjustments to the OMIDRIA contract royalty asset. The following schedule presents a rollforward of the OMIDRIA contract royalty asset (in thousands):

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Net income from discontinued operations is as follows:

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Cash flow from discontinued operations is as follows:

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Note 4—Net Loss Per Share

Our potentially dilutive securities include potential common shares related to our stock options, warrants, restricted stock units (“RSUs”) and unsecured convertible senior notes. Diluted earnings per share (“Diluted EPS”) considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential common shares would have an anti-dilutive effect. Diluted EPS excludes the impact of potential common shares related to our stock options in periods in which the option exercise price is greater than the average market price of our common stock for the period.

Potentially dilutive securities excluded from Diluted EPS are as follows:

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Trade receivables are net of product return and chargeback allowances. Product returns and chargeback allowances were $2.0 million as of December 31, 2021.

For the three months ended March 31, 2022 and 2021, depreciation and amortization expense was $0.3 million and $0.4 million, respectively.

Note 6—Fair-Value Measurements

As of March 31, 2022, and December 31, 2021, all investments were classified as short-term and available-for-sale on the accompanying condensed consolidated balance sheets. Investment income, which was included as a component of other income, consists of interest earned.

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On a recurring basis, we measure certain financial assets at fair value. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability, an exit price, in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting standard establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs, where available. The following summarizes the three levels of inputs required:

Level 1—Observable inputs for identical assets or liabilities, such as quoted prices in active markets;

Level 2—Inputs other than quoted prices in active markets that are either directly or indirectly observable; and

Level 3—Unobservable inputs in which little or no market data exists, therefore they are developed using estimates and assumptions developed by us, which reflect those that a market participant would use.

Our fair value hierarchy for our financial assets and liabilities measured at fair value on a recurring basis are as follows:

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Cash held in demand deposit accounts of $9.0 million and $100.8 million is excluded from our fair-value hierarchy disclosure as of March 31, 2022 and December 31, 2021, respectively. There were no unrealized gains or losses associated with our investments as of March 31, 2022 or December 31, 2021. The carrying amounts reported in the accompanying condensed consolidated balance sheets for receivables, accounts payable, other current monetary assets and liabilities approximate fair value.

See “Note 8—Unsecured Convertible Senior Notes” for the carrying amount and estimated fair value of our outstanding convertible senior notes.

Note 7—Line of Credit

We have a Loan and Security Agreement with Silicon Valley Bank (“SVB”), which provides for a $50.0 million revolving line of credit facility (the “Line of Credit Agreement”) based on 85% of our eligible royalty and trade receivables, net. The Line of Credit Agreement is secured by all our assets excluding intellectual property and development program inventories and matures in August 2022.

As of March 31, 2022 and December 31, 2021, no amounts were outstanding under the Line of Credit Agreement.

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Note 8—Unsecured Convertible Senior Notes

In November 2018, we issued $210.0 million in aggregate principal amount of our 6.25% Convertible Senior Notes (the “2023 Notes”), and in August and September 2020, we issued $225.0 million in aggregate principal amount

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of our 5.25% Convertible Senior Notes (the “2026 Notes”). We used a portion of the proceeds from the 2026 Notes to repurchase $115.0 million principal amount of the 2023 Notes and terminate a corresponding portion of the related capped call for the 2023 Notes, as described below.

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Unsecured convertible senior notes outstanding at March 31, 2022 and December 31, 2021 are as follows:

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2023 Unsecured Convertible Senior Notes

Our 2023 Notes accrue interest at an annual rate of 6.25% per annum, payable semi-annually in arrears on May 15 and November 15 of each year. The 2023 Notes mature on November 15, 2023 unless earlier purchased, redeemed or converted in accordance with their terms.

As of March 31, 2022, the unamortized debt issuance costs of $1.1 million will be amortized to interest expense at an effective interest rate of 7.0% over the remaining term.

The 2023 Notes are convertible into cash, shares of our common stock or a combination thereof, as we elect at our sole discretion. The initial conversion rate is 52.0183 shares of our common stock per $1,000 of note principal (equivalent to an initial conversion price of approximately $19.22 per share of common stock), subject to adjustment in certain circumstances. To reduce the dilutive impact or potential cash expenditure associated with the conversion of the 2023 Notes, we entered into a capped call transaction (the “2023 Capped Call”), which covers the number of shares of our common stock underlying the 2023 Notes when our common stock share price is trading between the initial conversion price of $19.22 and $28.84. In connection with the partial repurchase of the 2023 Notes, we entered into a capped call termination contract to unwind a proportionate amount of the 2023 Capped Call. As of March 31, 2022, approximately 4.9 million shares remained outstanding on the 2023 Capped Call.

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The following table sets forth total interest expense recognized in connection with the 2023 Notes:

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2026 Unsecured Convertible Senior Notes

The 2026 Notes are unsecured and accrue interest at an annual rate of 5.25% per annum, payable semi-annually in arrears on February 15 and August 15 of each year. The 2026 Notes mature on February 15, 2026, unless earlier purchased, redeemed or converted in accordance with their terms.

As of March 31, 2022, the unamortized debt issuance costs of $5.0 million will be amortized to interest expense at an effective interest rate of 5.9% over the remaining term.

The initial conversion rate is 54.0906 shares of our common stock per $1,000 of note principal (equivalent to an initial conversion price of approximately $18.4875 per share of common stock), which equals approximately 12.2 million shares of common stock issuable upon conversion, subject to adjustment in certain circumstances.

To reduce the dilutive impact or potential cash expenditure associated with the conversion of the 2026 Notes, we entered into capped call transactions (the “2026 Capped Calls”). The 2026 Capped Calls will cover the number of shares of our common stock underlying the 2026 Notes when our common stock share price is trading between the initial conversion price of $18.49 and $26.10. However, should the market price of our common stock exceed the $26.10 cap, then the conversion of the 2026 Notes would have a dilutive impact or may require a cash expenditure to the extent the market price exceeds the cap price.

The following table sets forth interest expense recognized related to the 2026 Notes:

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Future minimum payments for the 2023 Notes and 2026 Notes as of March 31, 2022 are as follows:

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Note 9—Leases

We have an operating lease for our office and laboratory facilities with an initial term that ends in 2027 with two options to extend the lease term by five years. On January 14, 2022, we entered into an agreement with our landlord to

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early terminate a portion of the rentable square footage of our office and laboratory facilities, which reduced the right of use asset by $4.7 million and related liability by $5.2 million. We recorded a non-cash gain of $0.5 million to early terminate the lease. In addition, we carry various finance leases for laboratory equipment.

Supplemental lease information is as follows:

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Note 10—Commitments and Contingencies

Contracts

We have various agreements with third parties that collectively require payment of termination fees totaling $31.0 million as of March 31, 2022 if we cancel the work within specific time frames, either prior to commencing or during performance of the contracted services.

Development Milestones and Product Royalties

We have licensed a variety of intellectual property from third parties that we are currently developing or may develop in the future. These licenses may require milestone payments during the clinical development processes or upon approval of commercial sale as well as low single- to low double-digit royalties on the net income or net sales of the product. For the three months ended March 31, 2022 and March 31, 2021, development milestone expenses were insignificant. Should narsoplimab be approved, we would owe milestone payments to development partners and be obligated to pay low single-digit royalties on net sales of the product.

Note 11—Shareholders’ Deficit

Common Stock and Warrants

On March 1, 2021, we entered into a sales agreement to sell shares of our common stock having an aggregate offering price of up to $150.0 million, from time to time, through an “at the market” equity offering program. As of March 31, 2022, we have not sold any shares under this program.

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In March 2021, a cashless exercise was executed for 43,115 warrants, resulting in the issuance of 24,901 shares of our common stock. As of March 31, 2022, 200,000 warrants remained outstanding with an exercise price of $23.00 per share. The warrants expire on April 12, 2023.

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The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model. The following assumptions were applied to all stock option grants:

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Stock option activity for all stock plans and related information is as follows:

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As of March 31, 2022, there were 2.8 million unvested options outstanding that will vest over a weighted-average period of 2.4 years. The total estimated compensation expense yet to be recognized on outstanding options is $23.0 million.

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The Company has 222,000 shares of unvested RSUs outstanding as of March 31, 2022 that vest 50% on December 1, 2022 and 50% on December 1, 2023.

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and the earlier of January 1, 2025 or the payment of the $200.0 million milestone described below. After such date, we will receive a royalty of 30% of the net revenue from sales of OMIDRIA in the U.S. until the expiration or termination of the last issued and unexpired patent with respect to OMIDRIA in the U.S. The U.S. base royalty rate is subject to a reduction down to 10% upon the occurrence of certain events described in the Asset Purchase Agreement, including during any specific period in which OMIDRIA is no longer eligible for separate payment (i.e., outside the packaged payment rate for the surgical procedure) under Medicare Part B. We will also will receive a royalty of 15% of the net revenue from sales of OMIDRIA outside the U.S. on a country-by-country basis between the closing date and the expiration or termination of the last issued and unexpired patent with respect to OMIDRIA in such country. In addition, we will receive a $200.0 million milestone payment if, prior to January 1, 2025, separate payment for OMIDRIA is secured under Medicare Part B for a continuous period of at least four years.

Clinical Development Programs

Our clinical stage development programs include:

In October 2020, we reported final clinical data from our pivotal trial of narsoplimab in HSCT-TMA, a frequently lethal complication of HSCT. In November 2020, we completed the rolling submission of our BLA for narsoplimab for the treatment of HSCT-TMA, and FDA accepted the BLA for filing in January 2021 under its Priority Review program. On October 18, 2021, we announced the receipt of a Complete Response Letter (“CRL”) from FDA regarding the BLA. In the CRL, FDA expressed difficulty in estimating the treatment effect of narsoplimab in HSCT-TMA and asserted that additional information will be needed to support regulatory approval. In February 2022, we had a Type A meeting with FDA to discuss the CRL, including each of the review issues that FDA identified as presenting difficulties interpreting the treatment response in the pivotal trial. Although we feel that we adequately addressed all of the issues noted in the CRL, the meeting minutes included a number of the review division’s critiques that we believe had already been addressed and/or were inaccurate. As a result, we currently plan to submit a Formal Dispute Resolution Request. Formal dispute resolution is an official pathway that enables a sponsor to appeal a decision by an FDA review division to a higher authority within FDA, in this case the Office of New Drugs. Our request is for regular approval based on the data in our existing BLA. We continue to believe that our BLA, as submitted, merits approval and that the data meet or exceed the threshold for substantial evidence of effectiveness; however, there can be no assurances that the Formal Dispute Resolution process will result in approval of our BLA, will provide a clear path to resubmission of our BLA, or that any identified path to BLA resubmission will be satisafactory in terms of the information, time and/or expenditure required.

In the EU, the EMA has confirmed narsoplimab’s eligibility for EMA’s centralized review of a single marketing authorization application (“MAA”) that, if approved, would authorize the product to be marketed in all EU member states and EEA countries. Although our resources are currently focused primarily on BLA approval in the U.S., we continue to advance toward submission of our MAA.

Phase 3 clinical programs are also ongoing for narsoplimab in IgA nephropathy and aHUS. In addition, narsoplimab is the only complement inhibitor included in a nationwide, late-stage adaptive platform trial evaluating multiple agents as potential treatments for COVID-19. Narsoplimab also has been administered under compassionate use to treat COVID-19 patients in Italy and in the U.S.

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Narsoplimab has received multiple designations from FDA and from the EMA across three current indications. These include:

In our IgA nephropathy program, patient enrollment continues in the narsoplimab Phase 3 clinical trial, ARTEMIS-IGAN. The single Phase 3 trial design is a randomized, double-blind, placebo-controlled multicenter trial in patients at least 18 years of age with biopsy-confirmed IgA nephropathy and 24-hour urine protein excretion greater than 1 g/day at baseline on optimized renin-angiotensin system blockade. This trial includes a run-in period. Initially, patients are expected to receive an IV dose of study drug each week for 12 weeks; additional weekly dosing can be administered to achieve optimal response. The primary endpoint, which could suffice for full or accelerated approval depending on the effect size, is reduction in proteinuria at 36 weeks after the start of dosing. The trial is designed to allow intra-trial adjustment in sample size. For the purposes of safety and efficacy assessments, the initial sample size for the proteinuria endpoint is estimated at 140 patients in each of the treatment and placebo groups. This will include a subset of patients with high levels of proteinuria (i.e., equal to or greater than 2 g/day) at baseline, and a substantial improvement at 36 weeks in this subset of patients alone could potentially form the basis for approval. We believe that the trial design will allow assessment for either full or accelerated approval at 36 weeks based on proteinuria results either (1) across the general population of study patients or (2) in the high-proteinuria subset of patients. In the event of full approval, estimated glomerular filtration rate (“eGFR”) becomes a safety endpoint only. In the event that the primary endpoint at 36 weeks results in accelerated approval from FDA, change in eGFR is expected to be assessed at approximately two years after the start of dosing. These eGFR data, if satisfactory, would then likely form the basis for full approval. In response to investigators’ concerns about extended withholding of narsoplimab treatment from any high-proteinuria patient initially randomized to the placebo-treated group, FDA will allow patients in that sub-population open-label treatment with narsoplimab after at least one year of blinded treatment.

The Phase 3 clinical program in patients with aHUS, in which patient recruitment is ongoing, consists of one Phase 3 clinical trial – a single-arm (i.e., no control arm), open-label trial in patients with newly diagnosed or ongoing aHUS. This trial is targeting approximately 40 patients for full approval in the EU and accelerated approval in the U.S. and, as required by FDA, approximately 80 total patients for full approval in the U.S. The trial includes multiple sites in the U.S., Asia and Europe; however, enrollment has been slow in part due to prioritizing the use of resources within our narsoplimab programs on HSCT-TMA, COVID-19 and IgA nephropathy.

Narsoplimab is also the only complement inhibitor included in the I-SPY COVID-19 adaptive platform trial sponsored by Quantum Leap Healthcare Collaborative, which is evaluating drugs and investigational products for the treatment of critically ill COVID-19 patients. To date, no drug investigated in the trial has been reported to show a benefit relative to the background therapy in the trial. Quantum is finalizing analyses of the narsoplimab data, and we look forward to sharing the outcome of the trial.

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In September 2020 we began enrollment and dosing in a placebo-controlled, double-blind, single-ascending-dose and multiple-ascending-dose Phase 1 clinical trial to evaluate the safety, tolerability, pharmacodynamics and pharmacokinetics of OMS906. We have dosed subjects across all dosing cohorts in the single-ascending dose study and reported preliminary data from the Phase 1 trial in June 2021. OMS906 has been well tolerated at all doses tested and preliminary human pharmacokinetic and pharmacodynamic data are consistent with once-monthly subcutaneous dosing and every-other-month or less frequent IV dosing. Recent data show high level suppression of alternative pathway activity. We have determined to forego the multiple-ascending dose portion of our Phase 1 trial in healthy subjects and plan to move directly into a Phase 1b clinical trial in patients with PNH who have an unsatisfactory response to the C5 inhibitor ravulizumab. We expect that this will accelerate our overall clinical development program for OMS906 in PNH. Preparations for the Phase 1b trial are underway and enrollment is expected to begin this summer.

In September 2019, we reported positive results from our completed Phase 1 clinical trial designed to assess the safety, tolerability and pharmacokinetics of the compound in healthy subjects. In the double blind, randomized Phase 1 study, the study drug, referred to as OMS182399, met the primary endpoints of safety and tolerability and showed a favorable and dose-proportional pharmacokinetic profile supporting once-daily dosing. There was no apparent food effect on plasma exposure to OMS182399. Continued clinical development in our PDE7 program is currently subject to allocation of internal financial and other resources, which are at present are prioritized for other programs, and/or accessing external funding.

Preclinical Development Programs and Platforms

Our preclinical programs and platforms include:

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Additionally, we are advancing research on a technology that may improve the potency and durability of adoptive T cell therapies. We validated our novel approach – which enforces memory phenotypes in cultured T cells through a previously unexplored pathway – in an aggressive mouse tumor model and are building a broad and exclusive intellectual property position around our platform. We believe that our novel approach has the potential to improve response rates for patients receiving either engineered or native T-cell therapies for liquid or solid tumors and are continuing to explore the application of this technology to human CAR-T and adoptive T cell therapy systems.

Financial Summary

On December 23, 2021, we completed the sale of our commercial product OMIDRIA and certain related assets, including inventory and prepaid expenses, to Rayner. We received $126.0 million in cash at closing, and we retained all outstanding accounts receivable as of the closing date. We will receive a royalty on world-wide sales of OMIDRIA and potentially a $200.0 million milestone payment if separate payment for OMIDRIA is secured in the U.S. for a continuous period of at least four years before January 1, 2025.

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As a result of the OMIDRIA divestiture, all the revenues and expenses related to OMIDRIA have been reclassified to net income from discontinued operations in our condensed consolidated statements of operations and comprehensive loss and excluded from continuing operations for all periods presented (see “Net Income from Discontinued Operations” below for additional information).

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As of March 31, 2022, we had $142.2 million in cash and cash equivalents and short-term investments available for general corporate use and $16.3 million in receivables.

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Results of Operations

Research and Development Expenses

Our research and development expenses can be divided into three categories: direct external expenses, which include clinical research and development and preclinical research and development activities; internal, overhead and other expenses; and stock-based compensation expense. Direct external expenses consist primarily of expenses incurred pursuant to agreements with third-party manufacturing organizations prior to receiving regulatory approval for a drug candidate, contract research organizations (“CROs”), clinical trial sites, collaborators, and licensors and consultants. Costs are reported in preclinical research and development until the program enters the clinic. Internal, overhead and other expenses consist of personnel costs, overhead costs such as rent, utilities and depreciation and other miscellaneous

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costs. The discontinued operations of OMIDRIA relate to the costs of drug manufacturing stability and quality control testing and costs of employees and consultants. The following table illustrates our expenses associated with these activities: