MFA FINANCIAL, INC.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

(Mark One)

☒ 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 Number:1-13991

(Exact name of registrant as specified in its charter)

(212)207-6400

(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 Securities 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 Exchange 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 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 Exchange Act. (Check one):

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. x

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.☐

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).☐

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

On June 30, 2025, the aggregate market value of the registrant’s common stock held by non-affiliates of the registrant was $966 million based on the closing sales price of our common stock on such date as reported on the New York Stock Exchange.

On February 17, 2026, the registrant had a total of 102,093,862 shares of Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s proxy statement to be filed with the Securities and Exchange Commission in connection with the Annual Meeting of Stockholders scheduled to be held on or about June 3, 2026, are incorporated by reference into Part III of this Annual Report on Form 10-K.

TABLE OF CONTENTS

All other financial statement schedules are omitted because the required information is not applicable or deemed not material, or the required information is included in the consolidated financial statements and/or notes thereto.

In this Annual Report on Form 10-K, references to “we,” “us,” “our” or “the Company” refer to MFA Financial, Inc. and its subsidiaries unless specifically stated otherwise or the context otherwise indicates. The following defines certain of the commonly used terms in this Annual Report on Form 10-K: Residential whole loans refer to loans that may include: (i) loans to finance (or refinance) one-to-four family residential properties that are not considered to meet the definition of a “Qualified Mortgage” in accordance with guidelines adopted by the Consumer Financial Protection Bureau (“Non-QM loans”), (ii) short-term business purpose loans collateralized by residential properties made to non-occupant borrowers that generally intend to rehabilitate or construct residential housing and then refinance or sell the properties (“Single-family transitional loans”); (iii) short-term business purpose loans collateralized by multifamily properties, typically with a loan balance below $10 million, made to non-occupant borrowers that generally intend to rehabilitate or stabilize and then refinance or sell the properties (“Multifamily transitional loans”) (collectively, “Transitional loans,” also sometimes referred to as “Rehabilitation loans” or “Fix and Flip loans”), (iv) business purpose loans to finance (or refinance) non-owner occupied one-to four-family residential properties that are rented to one or more tenants (“Single-family rental loans” and, collectively with Transitional loans, “Business purpose loans”), (v) loans primarily secured by residential real estate that were generally either non-performing or re-performing at acquisition (“Legacy RPL/NPL”) and (vi) loans on investor properties that conform to the standards for purchase by a federally chartered corporation, such as the Federal National Mortgage Association (“Fannie Mae”) or the Federal Home Loan Mortgage Corporation (“Freddie Mac”) (“Agency eligible investor loans”, which are included in “Other loans”). MBS generally refers to mortgage-backed securities secured by pools of residential mortgage loans; Agency MBS refers to MBS that are issued or guaranteed by a federally chartered corporation, such as the Fannie Mae or Freddie Mac, or an agency of the U.S. Government, such as the Government National Mortgage Association (“Ginnie Mae”); Non-Agency MBS refers to MBS that are not guaranteed by any agency of the U.S. Government or any federally chartered corporation and include (i) Legacy Non-Agency MBS, which are MBS issued prior to 2008, and (ii) RPL/NPL MBS, which refers to MBS backed primarily by securitized re-performing and non-performing loans. Hybrids refer to hybrid mortgage loans that have interest rates that are fixed for a specified period of time and, thereafter, generally adjust annually to an increment over a specified interest rate index; ARMs refer to adjustable-rate mortgage loans which have interest rates that reset annually or more frequently; CRT securities refer to credit risk transfer securities, that are debt obligations issued by or sponsored by Fannie Mae and Freddie Mac; and Real Estate Owned (“REO”) refers to real estate acquired by us, including through foreclosure, deed in lieu of foreclosure, or purchased in connection with the acquisition of residential whole loans.

CAUTIONARY NOTE REGARDING FORWARD LOOKING STATEMENTS

This Annual Report on Form 10-K includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, which are subject to risks and uncertainties. The forward-looking statements contain words such as “will,” “believe,” “expect,” “anticipate,” “estimate,” “plan,” “continue,” “intend,” “should,” “could,” “would,” “may,” the negative of these words or similar expressions.

These forward-looking statements include information about possible or assumed future results with respect to our business, financial condition, liquidity, results of operations, plans and objectives. Among the important factors that could cause our actual results to differ materially from those projected in any forward-looking statements that we make are: general economic developments and trends, including the current tensions in international trade, a potential prolonged U.S. government shutdown, and the performance of the labor, housing, real estate, mortgage finance and broader financial markets; inflation, increases in interest rates and changes in the market (i.e., fair) value of our residential whole loans, MBS, securitized debt and other assets, as well as changes in the value of our liabilities accounted for at fair value through earnings; the effectiveness of hedging transactions; changes in the prepayment rates on residential mortgage assets, an increase of which could result in a reduction of the yield on certain investments in our portfolio and could require us to reinvest the proceeds received by us as a result of such prepayments in investments with lower coupons, while a decrease in which could result in an increase in the interest rate duration of certain investments in our portfolio making their valuation more sensitive to changes in interest rates and could result in lower forecasted cash flows; credit risks underlying our assets, including changes in the default rates and management’s assumptions regarding default rates and loss severities on the mortgage loans in our residential whole loan portfolio; our ability to borrow to finance our assets and the terms, including the cost, maturity and other terms, of any such borrowings; implementation of or changes in government regulations or programs affecting our business (including as a result of the current U.S. administration); our estimates regarding taxable income the actual amount of which is dependent on a number of factors, including, but not limited to, changes in the amount of interest income and financing costs, the method elected by us to accrete the market discount on residential whole loans and the extent of prepayments, realized losses and changes in the composition of our residential whole loan portfolios that may occur during the applicable tax period, including gain or loss on any MBS disposals or whole loan modifications, foreclosures and liquidations; the timing and amount of distributions to stockholders, which are declared and paid at the discretion of our Board and will depend on, among other things, our taxable income, our financial results and overall financial condition and liquidity, maintenance of our REIT qualification and such other factors as the Board deems relevant; our ability to maintain our qualification as a REIT for federal income tax purposes; our ability to maintain our exemption from registration under the Investment Company Act of 1940, as amended (or the Investment Company Act), including statements regarding the concept release issued by the SEC relating to interpretive issues under the Investment Company Act with respect to the status under the Investment Company Act of certain companies that are engaged in the business of acquiring mortgages and mortgage-related interests; our ability to continue growing our residential whole loan portfolio, which is dependent on, among other things, the supply of loans offered for sale in the market; targeted or expected returns on our investments in recently-originated mortgage loans, the performance of which is, similar to our other mortgage loan investments, subject to, among other things, differences in prepayment risk, credit risk and financing costs associated with such investments; risks associated with the ongoing operation of Lima One Holdings, LLC (including, without limitation, industry competition, unanticipated expenditures relating to or liabilities arising from its operation (including, among other things, a failure to realize management’s assumptions regarding expected growth in business purpose loan (BPL) origination volumes andcredit risks underlying BPLs, including changes in the default rates and management’s assumptions regarding default rates and loss severities on the BPLs originated by Lima One)); expected returns on our investments in nonperforming residential whole loans (or NPLs), which are affected by, among other things, the length of time required to foreclose upon, sell, liquidate or otherwise reach a resolution of the property underlying the NPL, home price values, amounts advanced to carry the asset (e.g., taxes, insurance, maintenance expenses, etc. on the underlying property) and the amount ultimately realized upon resolution of the asset; the failure to realize the expected expense savings resulting from the anticipated relocation of our corporate headquarters in New York City; risks associated with our investments in loan originators; risks associated with investing in real estate assets generally, including changes in business conditions and the general economy; and other risks, uncertainties and factors, including those described in the annual, quarterly and current reports that we file with the SEC. These forward-looking statements are based on beliefs, assumptions and expectations of our future performance, taking into account information currently available. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date on which they are made. New risks and uncertainties arise over time and it is not possible to predict those events or how they may affect us. Except as required by law, we are not obligated to, and do not intend to, update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. (See Part I, Item 1A. “Risk Factors” of this Annual Report on Form 10-K.)