RENAISSANCERE HOLDINGS LTD

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

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

THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2025

OR

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

THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File No.001-14428

(Exact Name Of Registrant As Specified In Its Charter)

Renaissance House,12 Crow Lane, Pembroke HM 19 Bermuda

(Address of Principal Executive Offices) (Zip Code)

(441)295-4513

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Act. Yes x Noo

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

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 x Noo

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes x Noo

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Act. Large accelerated filer x, Accelerated filero, Non-accelerated filero, Smaller reporting company☐, Emerging growth company☐

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

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. o

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes☐ Nox

The aggregate market value of Common Shares held by nonaffiliates of the registrant at June 30, 2025 was $11.3 billion 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 6, 2026 was 43,488,908.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement for the 2026 Annual General Meeting of Shareholders are incorporated by reference into Part III of this report.

TABLE OF CONTENTS

NOTE ON FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K for the year ended December 31, 2025, of RenaissanceRe Holdings Ltd. contains forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. Forward-looking statements are necessarily based on estimates and assumptions that are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which, with respect to future business decisions, are subject to change. These uncertainties and contingencies can affect actual results and could cause actual results to differ materially from those expressed in any forward-looking statements made by, or on behalf of, us. In particular, statements using words such as “may,” “should,” “estimate,” “expect,” “anticipate,” “intend,” “believe,” “predict,” “potential,” or words of similar import generally involve forward-looking statements. For example, we may include certain forward-looking statements in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” with regard to trends in results, operations, underwriting performance, our segments or business units, reserves, market or economic conditions, investment results, margins, fees, risk management, and the consequences of our strategic decisions. This Form 10-K also contains forward-looking statements with respect to our business and industry, such as those relating to our strategy and management objectives, plans and expectations regarding our response and ability to adapt to changing economic conditions, market standing and product volumes, estimates of net negative impact and insured losses from loss events, competition in our industry, and government initiatives and regulatory matters affecting the (re)insurance industries.

The inclusion of forward-looking statements in this report should not be considered as a representation by us or any other person that our current objectives or plans will be achieved. Numerous factors could cause our actual results to differ materially from those addressed by the forward-looking statements, including the following:

•our exposure to natural and non-natural catastrophic events and circumstances and the variance they may cause in our financial results;

•the effect of climate change on our business, including the trend towards increasingly frequent and severe climate events;

•the effectiveness of our claims and claim expense reserving process;

•the effect of emerging claims and coverage issues;

•the performance of our investment portfolio and financial market volatility;

•the effects of inflation;

•our exposure to ceding companies and delegated authority counterparties and the risks they underwrite;

•our ability to maintain our financial strength ratings;

•our reliance on a small number of brokers;

•the highly competitive nature of our industry;

•the historically cyclical nature of the (re)insurance industries;

•collection on claimed retrocessional coverage and new retrocessional reinsurance being available;

•our ability to attract and retain key executives and employees;

•our ability to successfully implement our business, strategies and initiatives;

•our exposure to credit loss from counterparties;

•our need to make many estimates and judgments in the preparation of our financial statements;

•our exposure to risks associated with our management of capital on behalf of investors;

•changes to the accounting rules and regulatory systems applicable to our business, including changes in Bermuda and U.S. laws or regulations;

•the effect of current or future macroeconomic or geopolitical events or trends, including the ongoing conflicts globally;

•other political, regulatory or industry initiatives adversely impacting us;

•the impact of cybersecurity risks, including technology breaches or failure;

•our ability to comply with covenants in our debt agreements;

•the effect of adverse economic factors, including changes in the prevailing interest rates;

•the effects of new or possible future tax actions or reform legislation and regulations in the jurisdictions in which we operate;

•our ability to determine any impairments taken on our investments;

•our ability to raise capital on acceptable terms;

•our ability to comply with applicable sanctions and foreign corrupt practices laws; and

•our dependence on capital distributions from our operating subsidiaries.

As a consequence, our future financial condition and results may differ from those expressed in any forward-looking statements made by or on behalf of us. The factors listed above, as well as those discussed in more detail in “Part I, Item 1A. Risk Factors,” in this Form 10-K, should not be construed as exhaustive. Forward-looking statements speak only as of the date they are made, and we undertake no obligation to revise or update forward-looking statements to reflect new information, events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.