ITEM 1.    BUSINESS

Unless the context otherwise requires, references in this Form 10-K to "RenaissanceRe" refers to RenaissanceRe Holdings Ltd. (the parent company) and the "Company" refers to RenaissanceRe Holdings Ltd. and its subsidiaries, which principally include, but are not limited to, Renaissance Reinsurance, Glencoe Insurance Ltd. ("Glencoe"), Renaissance Reinsurance of Europe ("ROE"), Renaissance Trading Ltd. ("Renaissance Trading"), RenRe Energy Advisors Ltd. ("REAL") and the Company's Lloyd's syndicate, RenaissanceRe Syndicate 1458 ("Syndicate 1458").

We also underwrite reinsurance on behalf of joint ventures, principally including Top Layer Reinsurance Ltd. ("Top Layer Re"), recorded under the equity method of accounting, and DaVinci Reinsurance Ltd. ("DaVinci"). The financial results of DaVinci and DaVinci's parent company, DaVinciRe Holdings Ltd. ("DaVinciRe"), are consolidated in our financial statements. For your convenience, we have included a "Glossary of Selected Insurance and Reinsurance Terms". All dollar amounts referred to in this Form 10-K are in U.S. dollars unless otherwise indicated. Any discrepancies in the tables included herein between the amounts listed and the totals thereof are due to rounding.

OVERVIEW

RenaissanceRe was established in Bermuda in 1993 to write principally property catastrophe reinsurance and today is a leading global provider of reinsurance and insurance coverages and related services. Our aspiration is to be the world's best underwriter of high-severity, low frequency risks. Through our operating subsidiaries, we seek to produce superior returns for our shareholders by being a trusted, long-term partner to our customers for assessing and managing risk, delivering responsive solutions, and keeping our promises. We accomplish this by leveraging our core capabilities of risk assessment and information management, and by investing in our capabilities to serve our customers across the cycles that have historically characterized our markets. Overall, our strategy focuses on superior risk selection, superior customer relationships and superior capital management. We provide value to our customers and joint venture partners in the form of financial security, innovative products, and responsive service. We are known as a leader in paying valid reinsurance claims promptly. We principally measure our financial success through long-term growth in tangible book value per common share plus the change in accumulated dividends, which we believe is the most appropriate measure of our Company's financial performance, and believe we have delivered superior performance in respect of this measure over time.

Our core products include property catastrophe reinsurance, which we primarily write through our principal operating subsidiary Renaissance Reinsurance, Syndicate 1458, and joint ventures, principally DaVinci and Top Layer Re; specialty reinsurance risks written through Renaissance Reinsurance, Glencoe, Syndicate 1458 and DaVinci; and other insurance products primarily written through Syndicate 1458. We believe that we are one of the world's leading providers of property catastrophe reinsurance. We also believe we have a strong position in certain specialty reinsurance lines of business and a growing presence in the Lloyd's marketplace. Our reinsurance and insurance products are principally distributed through intermediaries, with whom we seek to cultivate strong long-term relationships. We continually explore appropriate and efficient ways to address the risk needs of our clients. We have created and managed several alternative capital vehicles in the past and may create additional shorter duration or other risk bearing vehicles in the future.

Since a substantial portion of the reinsurance and insurance we write provides protection from damages relating to natural and man-made catastrophes, our results depend to a large extent on the frequency and severity of such catastrophic events, and the coverages we offer to customers affected by these events. We are exposed to significant losses from these catastrophic events and other exposures that we cover. Accordingly, we expect a significant degree of volatility in our financial results and our financial results may vary significantly from quarter-to-quarter or from year-to-year, based on the level of insured catastrophic losses occurring around the world.

Our revenues are principally derived from three sources: 1) net premiums earned from the reinsurance and insurance policies we sell; 2) net investment income and realized and unrealized gains from the investment of our capital funds and the investment of the cash we receive on the policies which we sell; and 3) other

income received from our joint ventures, advisory services, weather and energy risk management operations and various other items.

Our expenses primarily consist of: 1) net claims and claim expenses incurred on the policies of reinsurance and insurance we sell; 2) acquisition costs which typically represent a percentage of the premiums we write; 3) operating expenses which primarily consist of personnel expenses, rent and other operating expenses; 4) corporate expenses which include certain executive, legal and consulting expenses, costs for research and development, and other miscellaneous costs, including those associated with operating as a publicly traded company; 5) redeemable noncontrolling interest - DaVinciRe, which represents the interest of third parties with respect to the net income (loss) of DaVinciRe; and 6) interest and dividend costs related to our debt and preference shares. We are also subject to taxes in certain jurisdictions in which we operate; however, since the majority of our income is currently earned in Bermuda, a non-taxable jurisdiction, the tax impact to our operations has historically been minimal.

The operating results, also known as the underwriting results, of an insurance or reinsurance company are discussed frequently by reference to its net claims and claim expense ratio, underwriting expense ratio, and combined ratio. The net claims and claim expense ratio is calculated by dividing net claims and claim expenses incurred by net premiums earned. The underwriting expense ratio is calculated by dividing underwriting expenses (acquisition expenses and operational expenses) by net premiums earned. The combined ratio is the sum of the net claims and claim expense ratio and the underwriting expense ratio. A combined ratio below 100% generally indicates profitable underwriting prior to the consideration of investment income. A combined ratio over 100% generally indicates unprofitable underwriting prior to the consideration of investment income. We also discuss our net claims and claim expense ratio on an accident year basis. This ratio is calculated by taking net claims and claim expenses, excluding development on net claims and claim expenses from events that took place in prior fiscal years, divided by net premiums earned.

As described in more detail below under "Segments", our reportable segments currently include: (1) Reinsurance, which includes catastrophe reinsurance, specialty reinsurance and certain property catastrophe and specialty joint ventures and (2) Lloyd's, which includes reinsurance and insurance business written through Syndicate 1458. As of December 31, 2012, we undertook a review of our reportable segments and concluded that our former Insurance segment no longer met the quantitative thresholds defined in Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic Segment Reporting. These operations are not actively involved in pursuing business opportunities and are in run-off; therefore we determined they no longer require, nor warrant, separate disclosure as a reportable segment. As such, the results of operations of the former Insurance segment have been included in our Other category as noted below, and all prior periods presented herein have been reclassified to conform with the current year presentation. Our Other category primarily reflects our: strategic investments; weather and energy risk management operations; investments unit; corporate expenses, capital servicing costs and noncontrolling interests; results of our discontinued operations; and now, in addition, the remnants of our Bermuda-based insurance operations not sold pursuant to the Stock Purchase Agreement, as defined herein, with QBE Holdings, Inc. ("QBE").

CORPORATE STRATEGY

Our mission is to produce superior returns for our shareholders by being a trusted, long-term partner to our customers for assessing and managing risk, delivering responsive solutions, and keeping our promises. Our aspiration is to be the world's best underwriter of high-severity, low frequency risks. Our vision is to be a leader in select financial services through our people and culture, expertise in risk, and passion for exceeding customers' expectations.

Since our inception, we have cultivated and endeavor to preserve certain competitive advantages that position us to fulfill our strategic objectives. We believe these competitive advantages include:

Superior Risk Selection .  We seek to build a portfolio of risks that produces an attractive return on utilized capital.  We develop a perspective of the risk in each business opportunity using both our underwriters' expertise and sophisticated risk selection techniques including computer models and databases, such as Renaissance Exposure Management System ("REMS©").  We pursue a disciplined approach to underwriting and select only those risks that we believe will produce a portfolio with an attractive return,

subject to prudent risk constraints.  We manage our portfolio of risks dynamically, both within sub-portfolios and across the Company.

Superior Customer Relationships.   We believe our modeling and technical expertise, and the risk management products that we provide our customers, has enabled us to become a provider of first choice in many lines of business to our customers worldwide.  We seek to offer stable, predictable, and consistent risk-based pricing and a prompt turnaround on our claims.

Superior Capital Management.   We seek to write as much attractively priced business as is available to us and then manage our capital accordingly.  We generally seek to raise capital when we forecast an increased demand in the market, at times by accessing capital through joint ventures or other structures, and seek to return capital to our shareholders or joint venture investors when the demand for our coverages appears to decline and when we believe a return of capital would be beneficial to our shareholders or joint venture investors.  In using joint ventures, we intend to leverage our access to business and our underwriting capabilities on an efficient capital base, develop fee income, generate profit commissions and diversify our portfolio. We routinely evaluate and review potential joint venture opportunities and strategic investments.

We believe we are well positioned to fulfill these objectives by virtue of the experience and skill of our management team, our significant financial strength, and our strong relationships with brokers and customers. In addition, we believe our superior service, our proprietary modeling technology, and our extensive business relationships, which have enabled us to become a leader in the property catastrophe reinsurance market, will be instrumental in allowing us to achieve our strategic objectives. In particular, we believe our strategy, high performance culture, and commitment to our customers and joint venture partners help us to differentiate ourselves by offering specialized services and products at times and in markets where capacity and alternatives may be limited.

SEGMENTS

As discussed above, our reportable segments currently include: (1) Reinsurance, which includes catastrophe reinsurance, specialty reinsurance and certain property catastrophe and specialty joint ventures and (2) Lloyd's, which includes reinsurance and insurance business written through Syndicate 1458. In addition, our Other category primarily reflects our: strategic investments; weather and energy risk management operations; investments unit; corporate expenses, capital servicing costs and noncontrolling interests; results of our discontinued operations; and now, in addition, the remnants of our Bermuda-based insurance operations not sold pursuant to the Stock Purchase Agreement with QBE.

For the year ended December 31, 2012 , our Reinsurance and Lloyd's segment accounted for 89.8% and 10.2% , respectively, of our total consolidated gross premiums written. We currently expect contributions from our Lloyd's segment to increase over time, on both an absolute and relative basis, although we cannot assure you we will succeed in meeting this goal. Operating results relating to our segments is included in "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations."

Reinsurance

Our Reinsurance segment has two main units and is managed by our President and Global Chief Underwriting Officer, who leads a team of underwriters, risk modelers and other industry professionals, who have access to our proprietary risk management, underwriting and modeling resources and tools.

exposed workers' compensation, surety, terrorism, energy, aviation, crop, political risk, trade credit, financial, mortgage guarantee, catastrophe-exposed personal lines property, casualty clash, certain other casualty lines and other specialty lines of reinsurance that we collectively refer to as specialty reinsurance. We believe that we are seen as a market leader in certain of these classes of business. We are seeking to expand our specialty reinsurance operations over time, although we cannot assure you that we will do so, particularly in light of current and forecasted market conditions. Our specialty reinsurance business is typically significantly impacted by a comparably small number of relatively large transactions.

We believe the expertise of our underwriting and modeling team and our proprietary analytic tools, together with superior customer service, provide us with a significant competitive advantage.

Our portfolio of business has continued to be increasingly characterized by relatively large transactions with ceding companies with whom we do business, although no current relationship exceeds 10% of our gross premiums written. Accordingly, our gross premiums written are subject to significant fluctuations depending on our success in maintaining or expanding our relationships with these large customers. We market our reinsurance products worldwide exclusively through brokers, whose market has become extremely consolidated in recent years.  In 2012 , three brokerage firms accounted for 84.6% of our Reinsurance segment gross premiums written.  We believe that recent market dynamics, and trends in our industry in respect of potential future consolidation, have increased our exposure to the risks of broker, client and counterparty concentration.

The following table shows our total Reinsurance segment gross premiums written split between catastrophe and specialty reinsurance, respectively:

	Year ended December 31,	2012				2011				2010
	(in thousands)
	Renaissance catastrophe premiums	$	733,963			$	742,236			$	630,080
	Renaissance specialty premiums	207,387				144,192				126,848
	Total Renaissance premiums	941,350				886,428				756,928
	DaVinci catastrophe premiums	448,244				435,060				364,153
	DaVinci specialty premiums	2,500				1,699				2,538
	Total DaVinci premiums	450,744				436,759				366,691
	Total catastrophe unit premiums (1)	1,182,207				1,177,296				994,233
	Total specialty unit premiums	209,887				145,891				129,386
	Total Reinsurance segment premiums	$	1,392,094			$	1,323,187			$	1,123,619

Property Catastrophe Reinsurance

We believe we are one of the largest providers of property catastrophe reinsurance in the world, based on our total catastrophe gross premiums written. Our principal property catastrophe reinsurance products include catastrophe excess of loss reinsurance and excess of loss retrocessional reinsurance as described below.

Catastrophe Excess of Loss Reinsurance .  We principally write catastrophe reinsurance on an excess of loss basis, which means we provide coverage to our insureds when aggregate claims and claim expenses from a single occurrence of a covered peril exceed the attachment point specified in a particular contract. Under these contracts, we indemnify an insurer for all or a specified portion of the losses on underlying insurance policies in excess of a specified amount, and up to an amount per loss specified in the contract. The coverage provided under excess of loss reinsurance contracts may be on a worldwide basis or limited in scope to selected geographic areas. Coverage can also vary from "all property" perils to limited coverage on selected perils, such as "earthquake only" coverage.

Excess of Loss Retrocessional Reinsurance.   We also write retrocessional reinsurance contracts that provide property catastrophe coverage to other reinsurers or retrocedants. In providing retrocessional reinsurance, we focus on property catastrophe retrocessional reinsurance, which covers the retrocedant on

an excess of loss basis when aggregate claims and claim expenses from a single occurrence of a covered peril and from a multiple number of reinsureds exceed a specified attachment point. The coverage provided under excess of loss retrocessional contracts may be on a worldwide basis or limited in scope to selected geographic areas. Coverage can also vary from "all property" perils to limited coverage on selected perils, such as "earthquake only" coverage. The information available to retrocessional underwriters concerning the original primary risk can be less precise than the information received from primary companies directly. Moreover, exposures from retrocessional business can change within a contract term as the underwriters of a retrocedant alter their book of business after retrocessional coverage has been bound.

Our property catastrophe reinsurance contracts are generally "all risk" in nature. Our most significant exposure is to losses from earthquakes and hurricanes and other windstorms, although we are also exposed to claims arising from other catastrophes, such as tsunamis, freezes, floods, fires, tornadoes, explosions and acts of terrorism in connection with the coverages we provide. Our predominant exposure under such coverage is to property damage. However, other risks, including business interruption and other non-property losses, may also be covered under our property reinsurance contracts when arising from a covered peril. We offer our coverages on a worldwide basis. Because of the wide range of possible catastrophic events to which we are exposed, including the size of such events and because of the potential for multiple events to occur in the same time period, our catastrophe reinsurance business is volatile and our results of operations reflect this volatility. Further, our financial condition may be impacted by this volatility over time or at any point in time. The effects of claims from one or a number of severe catastrophic events could have a material adverse effect on us. We expect that increases in the values and concentrations of insured property and the effects of inflation will increase the severity of such occurrences in the future.

Insurance-Linked Securities.   We also invest in insurance-linked securities. Insurance-linked securities are generally privately placed fixed income securities as to which all or a portion of the repayment of the principal is linked to catastrophic events; for example, the occurrence of one or more hurricanes or earthquakes producing industry losses exceeding certain specified thresholds. We underwrite, model, evaluate and monitor these securities using similar tools and techniques used to evaluate our more traditional property catastrophe reinsurance business assumed. In addition, we may enter into derivative transactions, such as total return swaps, that are based on or referenced to underlying insurance-linked securities. Based on an evaluation of the specific features of each insurance-linked security, we account for these securities as reinsurance or at fair value, as applicable, in accordance with U.S. generally accepted accounting principles ("GAAP"). In addition, in future periods we may utilize the growing market for insurance-linked securities to expand our ceded reinsurance buying if we find the pricing and terms of such coverage attractive.

We seek to moderate the volatility of our risk portfolio through superior risk selection, diversification and the purchase of retrocessional coverages and other protections. In furtherance of our strategy, we may increase or decrease our presence in the catastrophe reinsurance business based on market conditions and our assessment of risk-adjusted pricing adequacy. We frequently seek to purchase reinsurance or other protection for our own account to further reduce the financial impact that a large catastrophe or a series of catastrophes could have on our results.

As a result of our position in the market and reputation for superior customer relationships, we believe we have superior access to reinsurance business we view as desirable compared to the market as a whole. As described above, we use our proprietary underwriting tools and guidelines to attempt to construct an attractive portfolio from these opportunities. We dynamically model policy submissions against our current in-force underwriting portfolio, comparing our estimate of the modeled expected returns of the contract against the amount of capital that we allocate to the contract, based on our estimate of its marginal impact on our overall risk portfolio. At times, our approach to portfolio management has resulted and may result in the future in our having a relatively large market share of catastrophe reinsurance exposure in a particular geographic region, such as Florida where we historically have had a relatively large percentage of coverage exposures, or to a particular peril, such as U.S. hurricane risk, where we believe our analytical skills, claims paying history, large capacity, strong ratings and other attributes offer a competitive advantage, or where the risks or class of risks otherwise adds efficiency to our portfolio. Conversely, from time to time we may have a disproportionately low market share in certain regions or perils where we believe our capital would be less effectively deployed.

Specialty Reinsurance

We write a number of lines of reinsurance other than property catastrophe, such as catastrophe exposed workers' compensation, surety, terrorism, energy, aviation, crop, political risk, trade credit, financial, mortgage guarantee, catastrophe-exposed personal lines property, casualty clash, certain other casualty lines and other specialty lines of reinsurance that we collectively refer to as specialty reinsurance. We believe that we are seen as a market leader in certain of these classes of business. As with our catastrophe business, our team of experienced professionals seeks to underwrite these lines using a disciplined underwriting approach and sophisticated analytical tools. We are seeking to expand our specialty reinsurance operations over time, although we cannot assure you that we will do so, particularly in light of current and forecasted market conditions.

We generally target lines of business where we believe we can adequately quantify the risks assumed and where potential losses could be characterized as low frequency and high severity, similar to our catastrophe reinsurance coverages. However, we also provide other coverage where we believe our underwriting is robust and the market is attractive, and may grow in these lines over time. We also seek to identify market dislocations and write new lines of business whose risk and return characteristics are estimated to exceed our hurdle rates. Furthermore, we also seek to manage the correlations of this business with our overall portfolio, including our aggregate exposure to single and aggregated catastrophe events. We believe that our underwriting and analytical capabilities have positioned us well to manage our specialty reinsurance business.

We offer our specialty reinsurance products principally on an excess of loss basis, as described above with respect to our catastrophe reinsurance products, and also provide some proportional coverage. In a proportional reinsurance arrangement (also referred to as quota share reinsurance and pro-rata reinsurance), the reinsurer shares a proportional part of the original premiums and losses of the reinsured. The reinsurer pays the cedant a commission which is generally based on the cedant's cost of acquiring the business being reinsured (including commissions, premium taxes, assessments and miscellaneous administrative expenses) and may also include a profit factor. Our proportional reinsurance product offerings have grown in recent periods and may continue to grow in the future. These products frequently include tailored features such as limits or sub-limits which we believe help us manage our exposures. Any liability exceeding, or otherwise not subject to, such limits reverts to the cedant. As with our catastrophe reinsurance business, our specialty reinsurance frequently provides coverage for relatively large limits or exposures, and thus we are subject to potential significant claims volatility.

We generally seek to write significant lines on our specialty reinsurance treaties. As a result of our financial strength, we have the ability to offer significant capacity and, for select risks, we have made available significant limits. We believe these capabilities, the strength of our specialty reinsurance underwriting team, and our demonstrated ability and willingness to pay valid claims are competitive advantages of our specialty reinsurance business. While we believe that these and other initiatives will support growth in our specialty reinsurance unit, we intend to continue to apply our disciplined underwriting approach which, together with currently prevailing market conditions, is likely to temper such growth in current and near term-term periods.

Ventures

We pursue a number of other opportunities through our ventures unit, which has responsibility for creating and managing our joint ventures, executing customized reinsurance transactions to assume or cede risk and managing certain investments directed at classes of risk other than catastrophe reinsurance. We also provide customized weather and energy risk management solutions to various customers on a worldwide basis.

Property Catastrophe Managed Joint Ventures.   We actively manage property catastrophe-oriented joint ventures, which provide us with an additional presence in the market, enhance our client relationships and generate fee income and profit commissions. These joint ventures allow us to leverage our access to business and our underwriting capabilities on a larger capital base. Currently, our principal joint ventures include Top Layer Re and DaVinci. Renaissance Underwriting Managers, Ltd. ("RUM"), a wholly owned subsidiary of the Company, acts as the exclusive underwriting manager for each of these joint ventures.

DaVinci was established in 2001 and principally writes property catastrophe reinsurance and certain low frequency, high severity specialty reinsurance lines of business on a global basis. In general, we seek to

construct for DaVinci a property catastrophe reinsurance portfolio with risk characteristics similar to those of Renaissance Reinsurance's property catastrophe reinsurance portfolio and a portfolio of certain lines of specialty reinsurance such as terrorism and catastrophe exposed workers' compensation. In accordance with DaVinci's underwriting guidelines, it can only participate in business that is underwritten by Renaissance Reinsurance. We maintain majority voting control of DaVinciRe and, accordingly, consolidate the results of DaVinciRe into our consolidated results of operations and financial position. We seek to manage DaVinci's capital efficiently over time in light of the market opportunities and needs we perceive and believe we are able to serve. Our ownership in DaVinciRe was 30.8% at December 31, 2012 ( 2011 - 42.8% ). During January 2013 DaVinciRe redeemed shares from certain DaVinciRe shareholders, including us, while certain other existing DaVinciRe shareholders purchased additional shares in DaVinciRe. Subsequent to the above transactions, our ownership in DaVinciRe increased to 32.9% effective January 1, 2013.

We expect our ownership in DaVinciRe to fluctuate over time. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Capital Resources" for additional information with respect of DaVinci.

Top Layer Re was established in 1999 and writes high excess non-U.S. property catastrophe reinsurance. Top Layer Re is owned 50% by State Farm Mutual Automobile Insurance Company ("State Farm") and 50% by Renaissance Reinsurance. State Farm provides $3.9 billion of stop loss reinsurance coverage to Top Layer Re. We account for our equity ownership in Top Layer Re under the equity method of accounting and our proportionate share of its results is reflected in equity in earnings (losses) of other ventures in our consolidated statements of operations.

Effective January 1, 2012, we formed and launched a managed joint venture, Upsilon Reinsurance Ltd. ( " Upsilon Re " ), a Bermuda domiciled special purpose insurer ("SPI"), to provide additional capacity to the worldwide aggregate and per-occurrence retrocessional property catastrophe excess of loss market for the 2012 underwriting year. The original business was written by ROE, a wholly owned subsidiary of RenaissanceRe, and included $37.4 million of gross premiums written incepting between January 1, 2012 and June 1, 2012. A portion of this business was in turn ceded to Upsilon Re under a fully-collateralized retrocessional reinsurance contract, effective January 1, 2012. In conjunction with the formation and launch of Upsilon Re, $16.8 million of non-voting Class B shares were sold to external investors, and we invested $48.8 million in Upsilon Re's non-voting Class B shares, representing a 74.5% ownership interest in Upsilon Re. The Class B shareholders participate in substantially all of the profits or losses of Upsilon Re while the Class B shares remain outstanding. The holders of Class B shares indemnify Upsilon Re against losses relating to insurance risk. In addition, another third party investor supplied $17.6 million of capital through a reinsurance participation (a third party quota share agreement) with ROE alongside Upsilon Re. Inclusive of the reinsurance participation, we have a 61.4% participation in the original risks assumed by ROE related to Upsilon Re. During February 2013, Upsilon Re redeemed a portion of its outstanding third party non-voting Class B shares for $20.5 million as a result of the scheduled expiration of certain risks underwritten by Upsilon Re, subject to a holdback for development of claims and claim expenses.  Following the redemption, third-party non-voting Class B Shares with a GAAP book value of $2.2 million as at December 31, 2012 , remained outstanding.  In addition, the Company has authorized the release of $21.9 million of collateral to a third party investor who participated in risks underwritten by ROE related to Upsilon Re through a reinsurance participation. Both Upsilon Re and the reinsurance participation are managed by RUM in return for an expense override, as well as a potential underwriting profit commission. Upsilon Re is considered a variable interest entity ("VIE") and we are considered the primary beneficiary. As a result, Upsilon Re is consolidated by the Company and all significant inter-company transactions have been eliminated.

Effective June 1, 2012, we formed and launched a managed joint venture, Timicuan Reinsurance III Limited ( " Tim Re III " ), a Bermuda domiciled SPI, to provide collateralized reinsurance in respect of a portfolio of Florida reinstatement premium protection ("RPP") contracts. The original business was written by Renaissance Reinsurance and DaVinci, and included $41.1 million of gross premiums written incepting June 1, 2012, of which Renaissance Reinsurance and DaVinci ceded $37.7 million to Tim Re III under a fully-collateralized reinsurance contract. In conjunction with the formation and launch of Tim Re III, $44.8 million of Tim Re III's non-voting Class B shares were sold to external investors. Additionally, $10.3 million of the non-voting Class B shares were acquired by us, representing an 18.6% ownership interest in Tim Re III. The Class B shareholders participate in substantially all of the profits or losses of Tim Re III while the

Class B shares remain outstanding. The holders of Class B shares indemnify Tim Re III against losses relating to insurance risk. In addition, another third party investor supplied $5.2 million of capital through a reinsurance participation with Renaissance Reinsurance and DaVinci, alongside Tim Re III. Inclusive of the reinsurance participation, we have a 17.1% participation in the original risks assumed by Renaissance Reinsurance and DaVinci related to Tim Re III. Both Tim Re III and the reinsurance participation are managed by RUM in return for a potential underwriting profit commission. Tim Re III is considered a VIE and we are considered the primary beneficiary. As a result, Tim Re III is consolidated by the Company and all significant inter-company transactions have been eliminated.

Effective January 1, 2013, we formed and launched a managed joint venture, Upsilon Reinsurance II Ltd. ( " Upsilon Re II " ), a Bermuda domiciled SPI, to provide additional capacity to the worldwide aggregate and per-occurrence retrocessional property catastrophe excess of loss market for the 2013 underwriting year. Original business was written directly by Upsilon Re II and included $53.5 million of gross premiums written incepting January 1, 2013 under fully-collateralized reinsurance contracts. In conjunction with the formation and launch of Upsilon Re II, $61.0 million of Upsilon Re II non-voting Class B shares were sold to external investors. Additionally, $76.4 million of the non-voting Class B shares were acquired by us, representing a 55.6% ownership interest in Upsilon Re II. The Class B shareholders participate in substantially all of the profits or losses of Upsilon Re II while the Class B shares remain outstanding. The holders of Class B shares indemnify Upsilon Re II against losses relating to insurance risk. In addition, another third party investor supplied $17.5 million of capital through an insurance contract with the Company related to Upsilon Re II's reinsurance portfolio. Inclusive of the insurance contract, we have a 42.9% participation in the original risks assumed by Upsilon Re II. Both Upsilon Re II and the insurance contract are managed by RUM in return for an expense override, as well as a potential underwriting profit commission. Upsilon Re II is considered a VIE and we are considered the primary beneficiary. As a result, Upsilon Re II will be consolidated by the Company and all significant inter-company transactions will be eliminated.

We currently have an ownership interest in Upsilon Re, Tim Re III and Upsilon Re II which we expect will change over time, perhaps materially so, and we may also elect to underwrite additional risks within Upsilon Re II and utilize this entity, or newly formed joint ventures, to write business in future periods. We cannot assure you that additional opportunities to grow the business we have accessed through these joint ventures, will be realized.

Ventures works on a range of other customized reinsurance and financing transactions. For example, we have participated in and continuously analyze other attractive opportunities in the market for insurance-linked securities and derivatives. We believe our products contain a number of customized features designed to fit the needs of our partners, as well as our risk management objectives.

Weather and Energy Risk Management Operations.   We provide weather and energy related risk management solutions and financial products primarily through Renaissance Trading and REAL. Renaissance Trading sells financial products primarily to address weather risks, and engage in certain weather, energy and commodity derivatives trading activities, including trading securities and derivatives linked to energy, commodities, weather, other natural phenomena, and/or products or indices linked in part to such phenomena. Certain of these trading activities require the physical delivery of energy-related commodities, including natural gas. While our activities focus on products that allow various energy, utility and other customers to manage their exposures to energy related commodities, we expect our own results in this area to be volatile over time. We continually seek new markets and relationships for our weather and energy risk products, including continued leveraging of strategic affiliations and ceding risk through similar arrangements where we deem appropriate. Although there can be no assurances, it is possible that our results from these activities will increase on an absolute or relative basis over time, or in respect of any other period. As with our reinsurance operations, we seek to obtain capital support, volatility protection and other enhancements to the capital we deploy in respect of this business. However, we cannot assure you we will succeed in these initiatives in the future, or in maintaining the capital support and other related transactions currently in effect.

Strategic Investments.   Ventures also pursues strategic investments where, rather than assuming exclusive management responsibilities ourselves, we instead partner with other market participants. These investments are directed at classes of risk other than catastrophe, and at times may also be directed at non-insurance risks. We find these investments attractive both for their expected returns, and also because they provide us diversification benefits and information and exposure to other aspects of the market.

Examples of these investments include our investments in Tower Hill Insurance Group, LLC. ("THIG"), Tower Hill Holdings, Inc. ("Tower Hill") and Tower Hill Signature Insurance Holdings, Inc. ("Tower Hill Signature"), (collectively, the "Tower Hill Companies"), Angus Partners, LLC. ("Angus"), Angus Fund L.P. (the "Angus Fund") and Essent Group Ltd. ("Essent"). THIG is a managing general agency specializing in insurance coverage for site built and manufactured homes. Subsidiaries of THIG, namely Tower Hill Claims Services, LLC, and Tower Hill Claims Management, LLC, provide claim adjustment services through exclusive agreements with THIG. Tower Hill is an insurance holding company. The subsidiaries of Tower Hill, along with Tower Hill Signature, write residential property insurance. We invested in the Tower Hill Companies, which operate primarily in the State of Florida, to expand our core platforms by obtaining ownership in an additional distribution channel for the Florida homeowners market and to enhance our relationships with other stakeholders. Angus and entities in the Angus Fund's investment portfolio provide commodity related risk management products to third party customers. Renaissance Trading is the primary counterparty to Angus Partner's energy risk management hedging activities. Essent provides mortgage insurance and reinsurance coverage for mortgages located in the U.S.

Business activities that appear in our consolidated underwriting results, such as DaVinci and certain reinsurance transactions, are included in our Reinsurance segment results; the results of our investments, such as Top Layer Re, our weather and energy related activities and other ventures are included in the Other category of our segment results.

Lloyd's Segment

Our Lloyd's segment includes insurance and reinsurance business written for our own account through Syndicate 1458. Syndicate 1458 commenced business by writing certain lines of insurance and reinsurance business incepting on or after June 1, 2009. The syndicate was established to enhance our underwriting platform by providing access to Lloyd's extensive distribution network and worldwide licenses. RenaissanceRe Corporate Capital (UK) Limited ("RenaissanceRe CCL"), an indirect wholly owned subsidiary of the Company, is the sole corporate member of Syndicate 1458. RenaissanceRe Syndicate Management Ltd. ("RSML " ), a wholly owned subsidiary of RenaissanceRe, is the managing agent for Syndicate 1458. We anticipate that Syndicate 1458's absolute and relative contributions to our consolidated results of operations will have a meaningful impact over time, although we cannot assure you we will succeed in executing our growth strategy in respect of Syndicate 1458, or that its results will be favorable.

Syndicate 1458 generally targets lines of business where we believe we can adequately quantify the risks assumed. We also seek to identify market dislocations and to write new lines of business whose risk and return characteristics are attractive and add to our portfolio of risks. Furthermore, we seek to manage the correlations of this business with our overall portfolio, including our aggregate exposure to single and aggregated catastrophe events. We believe that our underwriting and analytical capabilities have positioned us well to manage this business.

We offer a range of property and casualty insurance and reinsurance products including, but not limited to, direct and facultative property, property catastrophe, agriculture, medical malpractice, general liability, professional indemnity, political risk and trade credit. We may seek to expand our coverages and capacity over time. As with our catastrophe and specialty reinsurance business, we frequently provide coverage for relatively large limits or exposures, and thus we are subject to potential significant claims volatility.

Other

Our Other category primarily includes the results of: (1) our share of strategic investments in certain markets we believe offer attractive risk-adjusted returns or where we believe our investment adds value, and where, rather than assuming exclusive management responsibilities ourselves, we partner with other market participants; (2) our weather and energy risk management operations primarily through Renaissance Trading and REAL; (3) our investment unit which manages and invests the funds generated by our consolidated operations; (4) corporate expenses, capital services costs and noncontrolling interests; (5) the results of our discontinued operations; and (6) as described in more details above, the remnants of our Bermuda-based insurance operations not sold pursuant to the Stock Purchase Agreement with QBE.

GEOGRAPHIC BREAKDOWN

Our exposures are generally diversified across geographic zones, but are also a function of market conditions and opportunities. Our largest exposure has historically been to the U.S. and Caribbean property catastrophe market, which represented 63.4% of the Company's gross premiums written for the year ended December 31, 2012 . A significant amount of our U.S. and Caribbean premium provides coverage against windstorms, mainly U.S. Atlantic hurricanes, as well as earthquakes and other natural and man-made catastrophes. The following table sets forth the percentage of our gross premiums written allocated to the territory of coverage exposure:

		2012							2011							2010
	Year ended December 31,	Gross Premiums Written				Percentage of Gross Premiums Written			Gross Premiums Written				Percentage of Gross Premiums Written			Gross Premiums Written				Percentage of Gross Premiums Written
	(in thousands, except percentages)
	Catastrophe
	U.S. and Caribbean	$	857,740			55.3	%		$	786,721			54.8	%		$	720,250			61.8	%
	Worldwide (excluding U.S.) (1)	139,265				9.0	%		164,112				11.4	%		113,270				9.7	%
	Worldwide	81,595				5.3	%		124,797				8.7	%		65,500				5.6	%
	Japan	43,238				2.8	%		49,021				3.4	%		26,188				2.2	%
	Europe	37,113				2.4	%		31,888				2.2	%		59,480				5.1	%
	Australia and New Zealand	18,578				1.2	%		16,818				1.2	%		6,269				0.5	%
	Other	4,678				0.3	%		3,939				0.3	%		3,276				0.3	%
	Total catastrophe	1,182,207				76.3	%		1,177,296				82.0	%		994,233				85.2	%
	Specialty
	Worldwide	96,081				6.2	%		91,032				6.3	%		59,636				5.2	%
	U.S. and Caribbean	69,070				4.4	%		49,832				3.5	%		57,461				4.9	%
	Australia and New Zealand	28,307				1.8	%		792				0.1	%		8,934				0.8	%
	Europe	16,429				1.1	%		3,595				0.3	%		2,786				0.2	%
	Other	—				—	%		640				—	%		569				—	%
	Total specialty	209,887				13.5	%		145,891				10.2	%		129,386				11.1	%
	Total Reinsurance	1,392,094				89.8	%		1,323,187				92.2	%		1,123,619				96.3	%
	Lloyd's
	Worldwide	75,132				4.8	%		47,605				3.3	%		16,207				1.4	%
	U.S. and Caribbean	57,332				3.7	%		48,435				3.4	%		43,178				3.7	%
	Europe	14,456				0.9	%		8,044				0.6	%		3,174				0.3	%
	Worldwide (excluding U.S.) (1)	6,064				0.4	%		238				—	%		1,049				0.1	%
	Australia and New Zealand	2,152				0.1	%		2,060				0.1	%		91				—	%
	Other	4,851				0.3	%		5,202				0.4	%		2,510				0.2	%
	Total Lloyd's	159,987				10.2	%		111,584				7.8	%		66,209				5.7	%
	Other category (2)	—				—	%		282				—	%		2,585				0.3	%
	Eliminations (3)	(490		)		—	%		(77		)		—	%		(27,118		)		(2.3	)%
	Total gross premiums written	$	1,551,591			100.0	%		$	1,434,976			100.0	%		$	1,165,295			100.0	%

NEW BUSINESS

From time to time we consider diversification into new ventures, either through organic growth, the formation of new joint ventures, or the acquisition of or the investment in other companies or books of business of other companies. This potential diversification includes opportunities to write targeted, additional classes of risk-exposed business, both directly for our own account and through possible new joint venture opportunities. We also regularly evaluate potential strategic opportunities that we believe might utilize our skills, capabilities, proprietary technology and relationships to support possible expansion into further risk-related coverages, services and products. Generally, we focus on underwriting or trading risks where reasonably sufficient data may be available, and where our analytical abilities may provide us a competitive advantage, in order for us to seek to model estimated probabilities of losses and returns in accordance with our approach in respect of our then current portfolio of risks.

We regularly review potential strategic transactions that might improve our portfolio of business, enhance or focus our strategies, expand our distribution or capabilities, or to seek other benefits. In evaluating potential new ventures or investments, we generally seek an attractive estimated return on equity, the ability to develop or capitalize on a competitive advantage, and opportunities which we believe will not detract from our core operations. While we regularly review potential strategic transactions and periodically engage in discussions regarding possible transactions, there can be no assurance that we will complete any such transactions or that any such transaction would be successful or materially enhance our results of operations or financial condition. We believe that our ability to potentially attract investment and operational opportunities is supported by our strong reputation and financial resources, and by the capabilities and track record of our ventures unit.

COMPETITION

The markets in which we operate are highly competitive, and we believe that competition is in general increasing and becoming more robust. Our competitors include independent reinsurance and insurance companies, subsidiaries and/or affiliates of globally recognized insurance companies, reinsurance divisions of certain insurance companies and domestic and international underwriting operations. As our business evolves over time we expect our competitors to change as well.

Hedge funds, investment banks, exchanges and other capital market participants have been increasingly active in the reinsurance market and the market for related risk. We expect competition from, or funded by, these sources to increase. In addition, we continue to anticipate further, and perhaps accelerating, growth in financial products such as exchange traded catastrophe options, insurance-linked securities, unrated privately held reinsurance companies providing collateralized reinsurance, catastrophe-linked derivative agreements and other financial products, intended to compete with traditional reinsurance. We believe that competition from non-traditional sources such as these has recently increased and will increase further in the future. It is possible that these changing dynamics will meaningfully impact the markets in which we participate, possibly adversely. Many of these competitors or their financial backers have greater financial, marketing and management resources than we do. Further, we believe new entrants or existing competitors may attempt to replicate all or part of our business model and provide further competition in the markets in which we participate. In addition, the tax policies of the countries where our customers operate, as well as government sponsored or backed catastrophe funds, affect demand for reinsurance, sometimes significantly. Moreover, explicitly or implicitly government-backed entities increasingly represent competition for the coverages that we provide directly, or for the business of our customers, reducing the potential amount of third party private protection our clients might need or desire. We are unable to predict the extent to which the foregoing new, proposed or potential initiatives may affect the demand for our products or the risks for which we seek to provide coverage.

UNDERWRITING AND ENTERPRISE RISK MANAGEMENT

Underwriting

Our primary underwriting goal is to construct a portfolio of reinsurance and insurance contracts and other financial risks that maximizes our return on shareholders' equity, subject to prudent risk constraints, and to generate long-term growth in tangible book value per common share plus the change in accumulated

dividends. We assess each new (re)insurance contract on the basis of the expected incremental return relative to the incremental contribution to portfolio risk.

We have developed a proprietary, computer-based pricing and exposure management system, REMS©. Since inception, we have continued to invest in and improve REMS©, incorporating our underwriting and modeling experience, adding proprietary software and a significant amount of new industry data. REMS© has analytic and modeling capabilities that help us to assess the risk and return of each incremental (re)insurance contract in relation to our overall portfolio of (re)insurance contracts. We combine the analyses generated by REMS© with other information available to us, including our own knowledge of the client submitting the proposed program, to assess the premium offered against the risk of loss and the cost of utilized capital which the program presents. The REMS© framework encompasses and facilitates risk capture, analysis, correlation, portfolio aggregation and capital allocation within a single system for all of our natural hazards and non-natural hazards (re)insurance contracts.

We generally utilize a multiple model approach combining both probabilistic and deterministic techniques. The underlying risk models integrated into our underwriting and REMS© framework are a combination of internally constructed and commercially available models. We use commercially available natural hazard catastrophe models to assist with validating and stress testing our base model and REMS© results. We continually strive to improve our analytical techniques for both natural hazard and non-natural hazard models in REMS© and while our experience is most developed for analyzing natural hazard catastrophe risks, we continue to make significant advances in our capabilities for assessing non-natural hazard catastrophe risks. In addition, multiple members of our underwriting and risk management team review the models, and their respective results.

We believe that REMS© is a robust underwriting and risk management system that has been successfully integrated into our business processes and culture. Before we bind a (re)insurance risk, exposure data, historical loss information and other risk data is gathered from customers. Using a combination of proprietary software, underwriting experience, actuarial techniques and engineering expertise where we deem appropriate, the exposure data is reviewed and augmented. We use this data as primary inputs into the REMS© modeling system as a base to create risk distributions to represent the risk being evaluated. We believe that the REMS© modeling system helps us to analyze each policy on a consistent basis, assisting our determination of what we believe to be an appropriate price to charge for each policy based upon the risk to be assumed. REMS© combines computer-generated statistical simulations that estimate loss and event probabilities with exposure and coverage information on each client's (re)insurance contract to produce expected claims for (re)insurance programs submitted to us. Operationally, on a deal-by-deal basis, our models employ simulation techniques that have the ability to generate 40,000 years of loss activity. When deemed necessary, we stress test the 40,000 year simulations with simulations of up to 1,000,000 years. At a consolidated level, we frequently utilize simulations of 500,000 years to incorporate reserve risk, investment risk, expenses, and operational and other risks at a portfolio and risk assuming entity level. For natural hazards, we simulate a large range of potential industry losses in respect of events by region and peril. For some regions and perils, the extreme tails of these simulations include industry losses in excess of $600 billion. From these simulations, we generate a probability distribution of potential outcomes for each policy in our portfolio and for our total portfolio. In part, through the process described above and the utilization of REMS©, we seek to compare our estimate of the expected returns in respect of a contract with the amount of capital that we notionally allocate to the contract based on our estimate of its marginal impact on our portfolio of risks. A key advantage of our REMS© framework is our ability to include additional perils, risks and geographic areas that may not be captured in commercially available natural hazards risk models.

We periodically review the estimates and assumptions that are reflected in REMS© and our other tools. For example, the 2011 and 2010 earthquake events in New Zealand and the Tohoku earthquake provided new insight on certain aspects of hazard and vulnerability to the global earthquake science community. Utilizing internal research capabilities from our team of scientists at Weather Predict Consulting Inc. ("Weather Predict") and new research from the global earthquake science community, we updated several of our internal regional representations of earthquake risk in advance of the commercially available models. In late 2012, storm Sandy gave rise to new data relating to storm surge, flood persistence and mid-Atlantic tropical storm meteorology.

Our underwriters use this combination of our risk assessment and underwriting process, REMS© and other tools in their pricing decisions, which we believe provides them with several competitive advantages. These include the ability to:

As part of our risk management process, we also use REMS© to assist us, as a retrocedant, with the purchase of reinsurance coverage for our own account.

Our underwriting and risk management process, in conjunction with REMS©, quantifies and manages our exposure to claims from single events and the exposure to losses from a series of events. As part of our pricing and underwriting process, we also assess a variety of other factors, including:

In order to estimate the risk profile of each line of non-natural hazard reinsurance (i.e., our specialty and casualty lines of business), we establish probability distributions and assess the correlations with the rest of our portfolio. In lines with catastrophe risk, such as excess workers' compensation and terrorism, we seek to directly leverage our skill in modeling for our property catastrophe reinsurance risks, and seek to appropriately estimate and manage the correlations between these specialty lines and our catastrophe reinsurance portfolio. For other classes of business, in which we believe we have little or no natural catastrophe exposure, and therefore less correlation with our property catastrophe reinsurance coverages, we derive probability distributions from a variety of underlying information sources, including recent historical experience, and the application of judgment as appropriate. The nature of some of these businesses lends itself less to the analysis that we use for our property catastrophe (re)insurance coverages, reflecting both the nature of available exposure information, and the impact of human factors such as tort exposure. We produce probability distributions to represent our estimates of the related underlying risks which our products cover, which we believe helps us to make consistent underwriting decisions and to manage our total risk portfolio.

In addition, we also produce, utilize and report on models which measure our utilization of capital in light of regulatory capital considerations and constraints.  Our position in respect of these regulatory capital models are reviewed by our risk management professional staff and periodically reported to and reviewed by senior underwriting personnel and executive management with responsibility for our regulated operating insurance entities.

Enterprise Risk Management ("ERM")

We believe that high-quality and effective risk management is best achieved through it being a shared cultural value throughout the organization. We have sought to develop and utilize a series of tools and processes that support a culture of risk management and to create a robust framework of ERM within our organization. We consider ERM to be a key process which is the responsibility of every individual within the Company. ERM is managed by our senior executive team under the oversight of our Board of Directors, and implemented by personnel from across our organization. We believe that ERM helps us to identify potential events that may affect us, to quantify, evaluate and manage the risks to which we are exposed, and to provide reasonable assurance regarding the achievement of our objectives. We believe that effective ERM can provide us with a significant competitive advantage. We also believe that effective ERM assists our efforts to minimize the likelihood of suffering financial outcomes in excess of the ranges which we have estimated in respect of specific investments, underwriting decisions, or other operating or business activities, although we do not believe this risk can be eliminated. We believe that our risk management tools support our strategy of pursuing opportunities and help us to identify opportunities that we believe to be the most attractive. In particular, we utilize our risk management tools to support our efforts to monitor our capital position, on a consolidated basis and for each of our major operating subsidiaries, and to allocate an appropriate amount of capital to support the risks that we have assumed in the aggregate and for each of our major operating subsidiaries. We believe that our risk management efforts are essential to our corporate strategy and our goal of achieving long-term growth in tangible book value per share plus the change in accumulated dividends for our shareholders.

Our ERM framework comprises three primary areas of focus, as set forth below:

and comply with the evolving requirements of business environment risk applicable to us.  In light of the rapid evolution of our markets, business environment, and business initiatives, we seek to continually invest in the tools, processes and procedures to mitigate our exposure to operational risk on a cost-effective basis. As with assumed risk and business environment risk, operational risk presents intrinsic uncertainties, and we may fail to appropriately identify or mitigate applicable operational risk.

Identification and monitoring of business environment risk and operational risk is coordinated by senior personnel including our Chief Financial Officer ("CFO"), General Counsel and Chief Compliance Officer ("CCO"), Corporate Controller and Chief Accounting Officer ("CAO"), Chief Administrative Officer, Chief Risk Officer ("CRO"), Chief Information Officer and Internal Audit, utilizing resources throughout the Company.

Although financial reporting is a key area of our focus, other operational risks are addressed through our disaster recovery program, human resource practices such as motivating and retaining top talent, our strict tax protocols and our legal and regulatory policies and procedures.

Controls and Compliance Committee.   We believe that a key component of our current operational risk management platform is our Controls and Compliance Committee. The Controls and Compliance Committee is comprised of our CFO, CCO, CAO, Chief Administrative Officer, CRO, staff compliance professionals and representatives from our business units. The purpose of the Controls and Compliance Committee is to establish, assess the effectiveness of, and enforce policies, procedures and practices relating to accounting, financial reporting, internal controls, regulatory, legal, compliance and related matters, and for ensuring compliance with applicable laws and regulations, the Company's Code of Ethics and Conduct (the "Code of Ethics"), and other relevant standards. In addition, the Controls and Compliance Committee is charged with reviewing certain transactions that potentially raise complex and/or significant tax, legal, accounting, regulatory, financial reporting, reputational or compliance issues.

Ongoing Development and Enhancement.   We seek to reflect and categorize risks we monitor in part through quantitative risk distributions, even where we believe that such quantitative analysis is not as robust or well developed as our tools and models for measuring and evaluating other risks, such as catastrophe and market risks. We also seek to improve the methods by which we measure risks. We believe effective risk management is a core attribute of our culture and is a continual process that requires ongoing improvement and development. We seek from time to time to identify effective new practices or additional developments both from within our industry and from other sectors. We believe that our ongoing efforts to embed ERM throughout our organization are important to our efforts to produce and maintain a competitive advantage to achieve our corporate goals.

RATINGS

Financial strength ratings are an important factor in respect of the competitive position of reinsurance and insurance companies. Rating organizations continually review the financial positions of our reinsurers and insurers. We continue to receive high claims-paying and financial strength ratings from A.M. Best Co. ("A.M. Best"), Standard and Poor's Rating Services ("S&P"), Moody's Investors Service ("Moody's") and Fitch Ratings Ltd. ("Fitch"). These ratings represent independent opinions of an insurer's financial strength, operating performance and ability to meet policyholder obligations, and are not an evaluation directed toward the protection of investors or a recommendation to buy, sell or hold any of our securities.

See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Capital Resources, Ratings" for the ratings of our principal operating subsidiaries and joint ventures by segment, and details of recent ratings actions. In addition, S&P assesses companies' ERM practices, which is an opinion on the many critical dimensions of risk that determine overall creditworthiness. RenaissanceRe has been assigned an ERM rating of "Excellent", which is the highest rating assigned by S&P, and indicates that S&P believes RenaissanceRe has extremely strong capabilities to consistently identify, measure, and manage risk exposures and losses within RenaissanceRe's predetermined tolerance guidelines.

RESERVES FOR CLAIMS AND CLAIM EXPENSES

We believe the most significant accounting judgment made by management is our estimate of claims and claim expense reserves. Claims and claim expense reserves represent estimates, including actuarial and statistical projections at a given point in time, of the ultimate settlement and administration costs for unpaid claims and claim expenses arising from the insurance and reinsurance contracts we sell. We establish our claims and claim expense reserves by taking claims reported to us by insureds and ceding companies, but which have not yet been paid ("case reserves"), adding the costs for additional case reserves ("additional case reserves") which represent our estimates for claims previously reported to us which we believe may not be adequately reserved as of that date, and adding estimates for the anticipated cost of claims incurred but not yet reported to us ("IBNR").

The following table summarizes our claims and claim expense reserves by line of business and split between case reserves, additional case reserves and IBNR:

	At December 31, 2012	Case Reserves				Additional Case Reserves				IBNR				Total
	(in thousands)
	Catastrophe	$	706,264			$	222,208			$	255,786			$	1,184,258
	Specialty	111,234				80,971				286,108				478,313
	Total Reinsurance	817,498				303,179				541,894				1,662,571
	Lloyd's	29,260				10,548				109,662				149,470
	Other	17,016				8,522				41,798				67,336
	Total	$	863,774			$	322,249			$	693,354			$	1,879,377
	At December 31, 2011
	(in thousands)
	Catastrophe	$	681,771			$	271,990			$	388,147			$	1,341,908
	Specialty	120,189				49,840				301,589				471,618
	Total Reinsurance	801,960				321,830				689,736				1,813,526
	Lloyd's	17,909				14,459				55,127				87,495
	Other	32,944				3,515				54,874				91,333
	Total	$	852,813			$	339,804			$	799,737			$	1,992,354

Our estimates of claims and claim expense reserves are not precise in that, among other matters, they are based on predictions of future developments and estimates of future trends and other variable factors. Some, but not all, of our reserves are further subject to the uncertainty inherent in actuarial methodologies and estimates. Because a reserve estimate is simply an insurer's estimate at a point in time of its ultimate liability, and because there are numerous factors which affect reserves and claims payments that cannot be determined with certainty in advance, our ultimate payments will vary, perhaps materially, from our estimates of reserves. If we determine in a subsequent period that adjustments to our previously established reserves are appropriate, such adjustments are recorded in the period in which they are identified. During the year ended December 31, 2012 , changes to prior year estimated claims reserves increased our net income by $158.0 million ( 2011 - decreased our net loss by $132.0 million , 2010 - increased our net income by $302.1 million ), excluding the consideration of changes in reinstatement premium, profit commissions, redeemable noncontrolling interest - DaVinciRe, equity in net claims and claim expenses of Top Layer Re and income tax.

The following table presents an analysis of our paid, unpaid and incurred losses and loss expenses and a reconciliation of beginning and ending reserves for claims and claim expenses for the years indicated:

	Year ended December 31,	2012				2011				2010
	(in thousands)
	Net reserves as of January 1	$	1,588,325			$	1,156,132			$	1,260,334
	Net incurred related to:
	Current year	483,180				993,168				431,476
	Prior years	(157,969		)		(131,989		)		(302,131		)
	Total net incurred	325,211				861,179				129,345
	Net paid related to:
	Current year	84,056				299,299				50,793
	Prior years	142,615				129,687				182,754
	Total net paid	226,671				428,986				233,547
	Total net reserves as of December 31	1,686,865				1,588,325				1,156,132
	Reinsurance recoverable as of December 31	192,512				404,029				101,711
	Total gross reserves as of December 31	$	1,879,377			$	1,992,354			$	1,257,843

Refer to "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Summary of Critical Accounting Estimates, Claims and Claim Expense Reserves" for additional discussion regarding the Company's reserving methodologies, including key assumptions and sensitivity analysis and a discussion regarding the Company's accounting treatment and favorable development on prior years net claims and claim expenses.

Our reserving methodology for each line of business uses a loss reserving process that calculates a point estimate for the Company's ultimate settlement and administration costs for claims and claim expenses. We do not calculate a range of estimates. We use this point estimate, along with paid claims and case reserves, to record our best estimate of additional case reserves and IBNR in our consolidated financial statements. Under GAAP, we are not permitted to establish estimates for catastrophe claims and claim expense reserves until an event occurs that gives rise to a loss.

Reserving for our reinsurance claims involves other uncertainties, such as the dependence on information from ceding companies, which among other matters, includes the time lag inherent in reporting information from the primary insurer to us or to our ceding companies and differing reserving practices among ceding companies. The information received from ceding companies is typically in the form of bordereaux, broker notifications of loss and/or discussions with ceding companies or their brokers. This information can be received on a monthly, quarterly or transactional basis and normally includes estimates of paid claims and case reserves. We sometimes also receive an estimate or provision for IBNR. This information is often updated and adjusted from time to time during the loss settlement period as new data or facts in respect of initial claims, client accounts, industry or event trends may be reported or emerge in addition to changes in applicable statutory and case laws.

Our estimates of losses from large events are based on factors including currently available information derived from the Company's claims information from certain customers and brokers, industry assessments of losses from the events, proprietary models, and the terms and conditions of our contracts. The uncertainty of our estimates for certain of these large events is additionally impacted by the preliminary nature of the information available, the magnitude and relative infrequency of the events, the expected duration of the respective claims development period, inadequacies in the data provided thus far by industry participants and the potential for further reporting lags or insufficiencies (particularly in respect of the Chilean, 2010 New Zealand, 2011 New Zealand and Tohoku earthquakes); and in the case of storm Sandy and the Thailand flooding, significant uncertainty as to the form of the claims and legal issues, under the relevant terms of insurance contracts and reinsurance treaties. In addition, a significant portion of the net claims and claim expenses associated with storm Sandy and the New Zealand and Tohoku earthquakes are concentrated with a few large clients and therefore the loss estimates for these events may vary significantly based on the claims experience of those clients. Loss reserve estimation in respect of our retrocessional contracts poses further challenges compared to directly assumed reinsurance. A significant

portion of our reinsurance recoverable relates to the New Zealand and Tohoku earthquakes. There is inherent uncertainty and complexity in evaluating loss reserve levels and reinsurance recoverable amounts, due to the nature of the losses relating to earthquake events, including that loss development time frames tend to take longer with respect to earthquake events. The contingent nature of business interruption and other exposures will also impact losses in a meaningful way, especially with regard to storm Sandy , the Tohoku earthquake and Thailand flooding, which we believe may give rise to significant complexity in respect of claims handling, claims adjustment and other coverage issues, over time. Given the magnitude and relatively recent occurrence of these large events, meaningful uncertainty remains regarding total covered losses for the insurance industry and, accordingly, several of the key assumptions underlying our loss estimates. In addition, our actual net losses from these events may increase if our reinsurers or other obligors fail to meet their obligations.

Because of the inherent uncertainties discussed above, we have developed a reserving philosophy which attempts to incorporate prudent assumptions and estimates, and we have generally experienced favorable net development on prior year reserves in the last several years. However, there is no assurance that this will occur in future periods.

Our reserving techniques, assumptions and processes differ between our property catastrophe reinsurance, specialty reinsurance and insurance businesses within our Reinsurance and Lloyd's segments, and Other category . Refer to our "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Summary of Critical Accounting Estimates, Claims and Claim Expense Reserves" for more information on the risks we insure and reinsure, the reserving techniques, assumptions and processes we follow to estimate our claims and claim expense reserves, and our current estimates versus our initial estimates of our claims reserves, for each of these units.

The following table represents the development of our GAAP balance sheet reserves for December 31, 2002 through December 31, 2012 . This table does not present accident or policy year development data. The top line of the table shows the gross reserves for claims and claim expenses at the balance sheet date for each of the indicated years. This represents the estimated amounts of claims and claim expenses arising in the current year and all prior years that are unpaid at the balance sheet date, including additional case reserves and IBNR reserves. The table also shows the re-estimated amount of the previously recorded reserves based on experience as of the end of each succeeding year. The estimate changes as more information becomes known about the frequency and severity of claims for individual years. The "cumulative redundancy on net reserves" represents the aggregate change to date from the indicated estimate of the gross reserve for claims and claim expenses, net of reinsurance recoverable on the second line of the table. The table also shows the cumulative net paid amounts as of successive years with respect to the net reserve liability. At the bottom of the table is a reconciliation of the gross reserve for claims and claim expenses to the net reserve for claims and claim expenses, the gross re-estimated liability to the net re-estimated liability for claims and claim expenses, and the cumulative redundancy on gross reserves.

With respect to the information in the table below, note that each amount includes the effects of all changes in amounts for prior periods, including the effect of foreign exchange rates.