ICF International, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

For the fiscal year ended December 31, 2025

OR

Commission File Number:001-33045

ICF INTERNATIONAL, INC.

(Exact name of Registrant as specified in its charter)

Registrant’s telephone number, including area code:

(703)934-3000

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

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

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☐ No ☒

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No☐

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

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or 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.

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

Indicate by check mark whether the registrant 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.☐

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 Section 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☐ No☒

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of the last business day of the registrant’s most recently completed second fiscal quarter was approximately$1,538 million based upon the closing price per share of $84.71, as quoted on the Nasdaq Global Select Market on June 30, 2025. Shares of the outstanding common stock held by each executive officer and director have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

As of February 20, 2026,18,273,280 shares of the registrant’s common stock, $0.001 par value, were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Part III incorporates information by reference from the Proxy Statement for the 2026 Annual Meeting of Stockholders expected to be held in June 2026.

TABLE OF CONTENTS

FORWARD-LOOKING STATEMENTS

Some of the statements in this Annual Report on Form 10-K constitute forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995, as amended. These statements involve known and unknown risks, uncertainties, and other factors that may cause our actual results, levels of activity, performance, or achievements to be materially different from any future results, levels of activity, performance, or achievements expressed or implied by such forward-looking statements. In some cases, you can identify these statements by forward-looking words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “should,” “will,” “would,” or similar words. You should read statements that contain these words carefully. The risk factors described in Item 1A of Part I of this Annual Report on Form 10-K captioned “Risk Factors,” or otherwise described in our filings with the Securities and Exchange Commission (“SEC”), as well as any cautionary language in this Annual Report on Form 10-K, provide examples of risks, uncertainties, and events that may cause our actual results to differ materially from the expectations we describe in our forward-looking statements, including, but not limited to:

•

Failure by Congress or other governmental bodies to agree on spending priorities and approve budgets and debt ceiling increases in a timely fashion and related reductions in government spending, as well as the impact resulting from a lengthy federal government shutdown;

•

Uncertainties relating to the current Administration’s (the “Administration”) policy changes and failure of the Administration to spend Congressionally mandated appropriations;

•

Changes in federal government budgeting and spending priorities;

•

Our dependence on contracts with United States (“U.S.”) federal, state and local, and international governments, agencies, and departments for the majority of our revenue;

•

Risks resulting from expanding our service offerings and client base;

•

Our ability to maintain strong client relationships in order to successfully win new, or renew expired, contracts;

•

The potential for conflicts of interest to arise based on the diversity of the services we provide and the clients we serve;

•

The amount of revenue and profit we derive from contracts awarded through a competitive bidding process;

•

Our reliance on our U.S. General Services Administration (“GSA”) Multiple Award Schedule (“GSA Schedule”) and other Indefinite Delivery/Indefinite Quantity (“IDIQ”) contracts;

•

Failure to realize the full amount of our backlog;

•

Provisions in our contracts that permit our clients to partially or completely terminate the contracts prior to completion;

•

Our relationships with other contractors and our ability to enter into “teaming” arrangements;

•

The ability to accurately estimate or control costs in our fixed-price contracts;

•

Dependence of our commercial work on certain sectors of the global economy that are highly cyclical;

•

Our involvement in larger and more complex engagements;

•

Risks associated with protesting contract awards;

•

Results of routine and non-routine government audits and investigations, including the unpredictability of the Administration’s executive orders;

•

Cybersecurity and other information system and technology risks, including misuse of personal data and systems failures.

•

Risks related to our intellectual property;

•

Acquisitions we undertake presenting integration challenges, failing to perform as expected, increasing our liabilities, and/or reducing our earnings;

•

Goodwill impairment;

•

Risks related to our corporate structure and our outstanding and future indebtedness;

•

The risk that we may not pay dividends on our stock;

•

Failure to attract and retain talented employees;

•

Changes in U.S. tax laws;

•

Complex laws, rules, and regulations that may differ across the jurisdictions in which we operate;

•

Additional risks of having international operations, including foreign currency fluctuations, tariffs and other trade restrictions, and geopolitical uncertainties and hostilities; and

•

Health epidemics, pandemics, and similar outbreaks.

Our forward-looking statements are based on the beliefs and assumptions of our management and the information available to our management at the time these statements were prepared. Although we believe the expectations reflected in these statements are reasonable, we cannot guarantee future results, levels of activity, performance, or achievements. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this Annual Report on Form 10-K. We undertake no obligation to update these forward-looking statements, even if our situation changes in the future.

The terms “we,” “our,” “us,” and “the Company,” as used throughout this Annual Report on Form 10-K, refer to ICF International, Inc. and its consolidated subsidiaries, unless otherwise indicated. The term “federal” or “federal government” refers to the U.S. federal government, and “state and local” or “state and local government” refers to U.S. state (including U.S. territories) and local governments, unless otherwise indicated.