X0609 4 2026-07-13 0001362004 ICF International, Inc. ICFI 0001376437 Wasson John false 1902 RESTON METRO PLAZA RESTON VA 20190 1 1 CEO & President 1 Common 2026-07-13 4 S 0 12411.0000 80.0836 D 27511.0000 I John M. Wasson Rev. Trust Common 21582.0000 D Common 716.0000 I By Spouse Common 12739.0000 I John M. Wasson Remainder Trust 2022 Common 39212.0000 I JW 26 GRAT The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 7, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $80.00 to $80.28, 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. /s/ James E. Daniel, Attorney-in-fact 2026-07-14