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( 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 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period From U UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K Delaware ( State or other jurisdiction of incorporation or organization ) ICF INTERNATIONAL , INC . ( Exact name of Registrant as specified in its charter ) 9300 Lee Highway Fairfax , VA ( Address of principal executive offices ) Large accelerated filer Non - accelerated filer Commission File Number : 001-33045 to Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , $ 0.001 par value Registrant's telephone number , including area code : ( 703 ) 934-3000 22-3661438 ( IRS Employer Identification Number ) Trading Symbols ( s ) ICFI Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes 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 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 No X U 22031 ( Zip Code ) 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 Name of each exchange on which registered The NASDAQ Stock Market LLC 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 . Accelerated filer 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 Ex - change 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 . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No > I | 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 $ 1,170 million based upon the closing price per share of $ 64.83 , as quoted on the NASDAQ Global Select Market on June 30 , 2020. 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 not necessarily a conclusive determination for other purposes . As of February 19 , 2021 , 18,874,883 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 2021 Annual Meeting of Stockholders expected to be held in May 2021 .