Q   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF

For the fiscal year ended December 31, 2013

o  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF

For the transition period from to

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Act. Yes Q No o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o No Q

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 Q  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files). Yes Q  No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, as defined in Rule 12b-2 of the Act. Large accelerated filer Q, Accelerated filer o, Non-accelerated filer o, Smaller reporting company o

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

The aggregate market value of Common Shares held by nonaffiliates of the registrant at June 30, 2013 was $3,716.7 million based on the closing sale price of the Common Shares on the New York Stock Exchange on that date.

The number of Common Shares, par value US $1.00 per share, outstanding at February 19, 2014 was 41,665,815.

The information required by Part III of this report, to the extent not set forth herein, is incorporated by reference to the registrant’s Definitive Proxy Statement to be filed in respect of our 2014 Annual General Meeting of Shareholders.

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 by matching well-structured risks with efficient sources of capital. 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, and by delivering responsive solutions. We accomplish this by leveraging our core capabilities of risk assessment and information management, by investing in our capabilities to serve our customers across the cycles that have historically characterized our markets and by keeping our promises. 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.

On August 30, 2013, we entered into a purchase agreement with a subsidiary of Munich-American Holding Corporation (together with applicable affiliates, “Munich”) to sell our U.S.-based weather and weather-related energy risk management unit, which included RenRe Commodity Advisors LLC (“RRCA”), Renaissance Trading Ltd. (“Renaissance Trading”) and RenRe Energy Advisors Ltd. (collectively referred to as “REAL”). REAL offered certain derivative-based risk management products primarily to address weather and energy risk and engaged in hedging and trading activities related to those transactions. On October 1, 2013, we closed the sale of REAL to Munich. We have classified the assets and liabilities associated with this transaction as held for sale and, at December 31, 2013, there were no remaining assets or liabilities related to REAL included on our consolidated balance sheet, although we have certain ongoing commitments and obligations pursuant to the sale agreement. The financial results for these operations have been presented in our consolidated financial statements as “discontinued operations” for all periods presented. Consideration for the transaction was $60.0 million, paid in cash at closing, subject to post-closing adjustments for certain tax and other items. We recorded a loss on sale of $8.8 million in conjunction with the sale, including related direct expenses to date. Refer to “Note 3. Discontinued Operations in our Notes to Consolidated Financial Statements”, for additional information.

Our business consists of three reportable segments: (1) Catastrophe Reinsurance, which includes catastrophe reinsurance and certain property catastrophe joint ventures managed by our ventures unit; (2) Specialty Reinsurance, which includes specialty reinsurance and certain specialty joint ventures managed by our ventures unit; and (3) Lloyd’s, which includes reinsurance and insurance business written through Syndicate 1458. Previously, we disclosed Reinsurance and Lloyd’s as our reportable segments. In addition, our Other category primarily reflects our strategic investments; investments unit; corporate expenses; capital servicing costs; noncontrolling interests; results of our discontinued operations; and the remnants of our Bermuda-based insurance operations not sold pursuant to our stock purchase agreement with QBE Holdings, Inc. (“QBE”).

We seek to produce superior returns for our shareholders over the long-term.  We believe that market leadership is required to produce the best expected returns.  We pursue markets where leadership comes from seeking to be the best underwriter.  We define our pursuit of superior underwriting as the process of matching well-structured risk with capital whose owners would find the risk-return trade-off attractive. 

To support our mission to seek to be the best underwriter, our strategy is to operate an integrated system to match well structured risk and efficient capital.  Operating our business as an integrated system enables us to pursue three competitive advantages: superior customer relationships, superior risk selection and superior capital management.  We believe that all three competitive advantages are necessary simultaneously and that activity must be coordinated to deliver them seamlessly for the benefit of our ceding insurers, brokers, investors in our sidecars and joint ventures, and shareholders. The strategy is supported by our core values, our principles and our culture.

Superior Customer Relationships.  We seek to be a trusted long-term partner to our customers for assessing and managing risk and delivering responsive solutions. We believe our modeling and technical expertise, the risk management products that we provide our customers and keeping our promises, 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 Risk Selection.  We seek to build a portfolio of risks that produces an attractive risk-adjusted return on utilized capital.  We develop a perspective of the risk in each business 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 seek to 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 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, diversify our portfolio and provide attractive risk-adjusted returns to our capital providers. We routinely evaluate and review potential joint venture opportunities and strategic investments.

In conjunction with changes in our management structure during 2013, including the appointment of a new Chief Executive Officer, and changes in the mix of our reinsurance business, we revised our reportable segments to: (1) Catastrophe Reinsurance, which includes catastrophe reinsurance and certain property catastrophe joint ventures managed by our ventures unit; (2) Specialty Reinsurance, which includes specialty reinsurance and certain specialty joint ventures managed by our ventures unit; and (3) Lloyd’s, which includes reinsurance and insurance business written through Syndicate 1458. Previously, our Catastrophe Reinsurance and Specialty Reinsurance segments were aggregated and were reported as the Reinsurance segment. All prior periods presented have been reclassified to conform to this presentation.

In addition, our Other category primarily reflects our: strategic investments; investments unit; corporate expenses; capital servicing costs; noncontrolling interests; results of our discontinued operations; and the remnants of our Bermuda-based insurance operations not sold pursuant to our stock purchase agreement with QBE.

For the year ended December 31, 2013, our Catastrophe Reinsurance, Specialty Reinsurance and Lloyd’s segments accounted for 69.7%, 16.2% and 14.1%, respectively, of our total consolidated gross premiums written. We currently expect contributions from our Specialty and Lloyd’s segments to increase over time, on both an absolute and relative basis, although we cannot assure you we will succeed in meeting this objective. Operating results relating to our segments is included in “Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Our portfolio of business continues to be 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 customers. We market our reinsurance products worldwide exclusively through brokers, whose market has become extremely consolidated in recent years.  In 2013, three brokerage firms accounted for 88.2% of our Catastrophe Reinsurance and Specialty Reinsurance segments’ 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 gross premiums written split between our Catastrophe Reinsurance, Specialty Reinsurance and Lloyd’s segment, respectively:

(1) Included in gross premiums written in the Other category is inter-segment gross premiums written of $1.0 million for the year ended December 31, 2013 (2012 - $0.5 million, 2011 - $0.1 million).

Catastrophe Reinsurance Segment

Mona Lisa Re meets the definition of a VIE as it does not have sufficient equity capital to finance its activities. We do not have a variable interest in Mona Lisa Re and as a result, the financial position and results of operations of Mona Lisa Re are not consolidated by the Company. The only transactions related to Mona Lisa Re that are recorded in the Company’s consolidated financial statements are the ceded reinsurance agreements entered into by Renaissance Reinsurance and DaVinci. During 2013, Renaissance Reinsurance and DaVinci have together entered into ceded reinsurance contracts with Mona Lisa Re with gross premiums ceded of $9.2 million and $6.5 million, respectively. We have not provided any financial or other support to Mona Lisa Re that was not contractually required to be provided.

Specialty Reinsurance Segment

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 segment, 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 periods.

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 noncontrolling economic ownership in DaVinciRe was 27.3% at December 31, 2013 (2012 - 30.8%). During January 2014, DaVinciRe redeemed a portion of its outstanding shares from all existing DaVinciRe shareholders, including us, while a new DaVinciRe shareholder purchased new shares in DaVinciRe. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions is 26.5%, effective January 1, 2014.

Effective January 1, 2013, we formed and launched a managed joint venture, Upsilon RFO, a Bermuda domiciled SPI (formerly known as Upsilon Reinsurance II Ltd.), to provide additional capacity to the worldwide aggregate and per-occurrence primary and retrocessional property catastrophe excess of loss market. Upsilon RFO’s creation further enhances our efforts to match desirable reinsurance risk with efficient capital through a strategic capital structure. Original business was written directly by Upsilon RFO and included $53.5 million of gross premiums written incepting January 1, 2013 under fully-collateralized reinsurance contracts capitalized through the sale of non-voting shares to investors and an insurance contract issued by a third party investor to the Company related to Upsilon RFO’s reinsurance portfolio. Both Upsilon RFO and the insurance participation are managed by RUM in return for an expense override. Through RUM, we are eligible to receive a potential underwriting profit commission in respect of Upsilon RFO. The Company’s participation in the original risks assumed by Upsilon RFO prior to January 1, 2014 was 25.8%, inclusive of the related insurance contract, effective December 31, 2013.

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” and, collectively, the “Tower Hill Companies”), Universal Holdings Inc. (“Universal”), Angus Partners, LLC. (“Angus”) 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. Universal is an integrated insurance holding company performing all aspects of insurance underwriting, distribution and claims, primarily in the Florida homeowners market. Angus provides commodity related risk management products to third party customers. Essent provides mortgage insurance and reinsurance coverage for mortgages located in the U.S. On October 31, 2013, Essent’s common shares began publicly trading on the NYSE. At December 31, 2013, the fair value of our investment in Essent was $121.1 million and we have agreed, subject to certain exceptions, not to dispose of or hedge any of the common shares of Essent we hold prior to April 28, 2014. See “Part II, Item 7. Managements Discussion and Analysis, Net Investment Income” for additional information with respect to our investment in Essent. The carrying value of these investments on our consolidated balance sheet, individually or in the aggregate, may differ from the realized value we may ultimately attain, perhaps significantly so. Other than Essent and Universal, none of the securities we hold in respect of these investments are publicly traded.

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

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 investment unit which manages and invests the funds generated by our consolidated operations; (3) corporate expenses, capital services costs and noncontrolling interests; (4) the results of our discontinued operations; and (5) the remnants of our Bermuda-based insurance operations.

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 market, which represented 59.9% of the Company’s gross premiums written for the year ended December 31, 2013. 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:

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, domestic and international underwriting operations, and a range of entities offering forms of risk transfer protection on a collateralized or other non-traditional basis. As our business evolves over time we expect our competitors to change as well.

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, Head of Internal Audit, 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 striving to ensure 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.

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 “Part II, 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 “Very Strong”, which is the highest rating assigned by S&P, and indicates that S&P believes RenaissanceRe has very strong capabilities to consistently identify, measure, and manage risk exposures and losses within RenaissanceRe’s predetermined tolerance guidelines.

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

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 2013, changes to prior year estimated claims reserves increased our net income by $144.0 million (2012 - increased our net income by $158.0 million, 2011 - decreased our net loss by $132.0 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:

Our reserving techniques, assumptions and processes differ among our Catastrophe Reinsurance, Specialty Reinsurance and Lloyd’s segments, and Other category. Refer to “Part II, 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, 2003 through December 31, 2013. 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.