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These shares were sold in multiple transactions at prices ranging from $88.44 to $89.42, inclusive.  The reporting person undertakes to provide to ICF International, Inc., any security holder of ICF International, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4."}],"balance_after":6339,"source":{"system":"sec-edgar","filing":"0001225208-26-007533","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1376437/000122520826007533/doc4.xml","form_type":"4"}},{"id":819,"issuer":{"id":740,"kind":"organization","name":"ICF International, Inc.","symbol":"ICFI"},"owners":[{"id":741,"kind":"person","name":"Wasson John","position":1,"cik":"0001376437","reported_name":"Wasson John","relationship":{"director":true,"officer":true,"officer_title":"CEO & President"}}],"security":"Common","published_at":"2026-09-02T20:42:45.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":585,"price":89.6822,"value":52464.087,"ownership":{"direct":false,"nature":"John M. Wasson Remainder Trust 2022"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on March 7, 2026. The spouse of the reporting person serves as trustee of the trust."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $89.49 to $89.85, inclusive.  The reporting person undertakes to provide to ICF International, Inc., any security holder of ICF International, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4."}],"balance_after":12154,"source":{"system":"sec-edgar","filing":"0001225208-26-007533","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1376437/000122520826007533/doc4.xml","form_type":"4"}},{"id":675000,"issuer":{"id":740,"kind":"organization","name":"ICF International, Inc.","symbol":"ICFI"},"owners":[{"id":19481,"kind":"person","name":"Ostria Sergio J","position":1,"cik":"0001652933","reported_name":"Ostria Sergio J","relationship":{"officer":true,"officer_title":"Executive Vice President"}}],"security":"Common","published_at":"2026-08-26T21:46:24.000Z","date":"2026-08-26","kind":"sale","planned":false,"acquired":false,"shares":2000,"price":88.5915,"value":177183.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $88.42 to $88.73, inclusive.  The reporting person undertakes to provide to ICF International, Inc., any security holder of ICF International, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4."}],"balance_after":24467,"source":{"system":"sec-edgar","filing":"0001225208-26-007331","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1652933/000122520826007331/doc4.xml","form_type":"4"}},{"id":709614,"issuer":{"id":740,"kind":"organization","name":"ICF International, Inc.","symbol":"ICFI"},"owners":[{"id":741,"kind":"person","name":"Wasson John","position":1,"cik":"0001376437","reported_name":"Wasson John","relationship":{"director":true,"officer":true,"officer_title":"CEO & President"}}],"security":"Common","published_at":"2026-07-14T20:13:28.000Z","date":"2026-07-13","kind":"sale","planned":true,"acquired":false,"shares":12411,"price":80.0836,"value":993917.5596,"ownership":{"direct":false,"nature":"John M. 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The reporting person undertakes to provide to ICF International, Inc., any security holder of ICF International, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4."}],"balance_after":27511,"source":{"system":"sec-edgar","filing":"0001225208-26-006600","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1362004/000122520826006600/doc4.xml","form_type":"4"}},{"id":718427,"issuer":{"id":740,"kind":"organization","name":"ICF International, Inc.","symbol":"ICFI"},"owners":[{"id":32983,"kind":"person","name":"Williams Michelle A","position":1,"cik":"0001894152","reported_name":"Williams Michelle A","relationship":{"director":true}}],"security":"Common","published_at":"2026-07-02T20:22:02.000Z","date":"2026-07-01","kind":"grant","planned":false,"acquired":true,"shares":2277,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This award of restricted stock units was granted pursuant to the ICF International, Inc. 2026 Omnibus Incentive Plan, and represents the Reporting Person's annual equity award.  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These restricted stock units will vest on the one year anniversary of the Date of Grant (July 1)."}],"balance_after":23851,"source":{"system":"sec-edgar","filing":"0001225208-26-006392","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1694310/000122520826006392/doc4.xml","form_type":"4"}},{"id":717471,"issuer":{"id":740,"kind":"organization","name":"ICF International, Inc.","symbol":"ICFI"},"owners":[{"id":741,"kind":"person","name":"Wasson John","position":1,"cik":"0001376437","reported_name":"Wasson John","relationship":{"director":true,"officer":true,"officer_title":"CEO & President"}}],"security":"Common","published_at":"2026-07-02T20:21:56.000Z","date":"2026-06-30","kind":"grant","planned":false,"acquired":true,"shares":279,"price":70.0625,"value":19547.4375,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"The reporting person is voluntarily reporting the acquisition of shares of the issuer's common stock pursuant to the ICF International, Inc. 2006 Employee Stock Purchase Plan (the ESPP), for the ESPP purchase period of January 2, 2026 through June 30, 2026.  This transaction is also exempt pursuant to Rule 16b-3(c)."},{"field":"date","element":"transactionDate","label":"F2","text":"The Offering Period (as defined in the ESPP) ended on June 30, 2026, and the shares were acquired on the last business day of the Offering Period."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"In accordance with the ESPP, these shares were purchase at a price not less than ninety-five percent (95%) of the per share fair market value of the Common Shares (as defined in the ESPP) as of June 30, 2026, the last trading day prior to the end of the Offering Period."}],"balance_after":21582,"source":{"system":"sec-edgar","filing":"0001225208-26-006396","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1362004/000122520826006396/doc4.xml","form_type":"4"}},{"id":717470,"issuer":{"id":740,"kind":"organization","name":"ICF International, Inc.","symbol":"ICFI"},"owners":[{"id":15301,"kind":"person","name":"Datar Srikant M.","position":1,"cik":"0001376436","reported_name":"Datar Srikant M.","relationship":{"director":true}}],"security":"Common","published_at":"2026-07-02T20:21:56.000Z","date":"2026-07-01","kind":"grant","planned":false,"acquired":true,"shares":2277,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This award of restricted stock units was granted pursuant to the ICF International, Inc. 2026 Omnibus Incentive Plan, and represents the Reporting Person's annual equity award.  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These shares were sold in multiple transactions at prices ranging from $61.45  to $61.65, inclusive.  The reporting person undertakes to provide to ICF International, Inc., any security holder of ICF International, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4."}],"balance_after":20254,"source":{"system":"sec-edgar","filing":"0001225208-26-005466","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1226090/000122520826005466/doc4.xml","form_type":"4"}},{"id":829080,"issuer":{"id":740,"kind":"organization","name":"ICF International, Inc.","symbol":"ICFI"},"owners":[{"id":741,"kind":"person","name":"Wasson John","position":1,"cik":"0001376437","reported_name":"Wasson John","relationship":{"director":true,"officer":true,"officer_title":"CEO & President"}}],"security":"Restricted Stock 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