X0306 4 2020-12-31 0001362004 ICF International, Inc. ICFI 0001376429 Kesavan Sudhakar 9300 LEE HIGHWAY FAIRFAX VA 22031 1 1 Executive Chairman Common 2020-12-31 4 M 0 52098.0000 40.6800 A 283926.0000 D Common 2020-12-31 4 M 0 42900.0000 0 A 326826.0000 D Common 2020-12-31 4 M 0 13801.0000 27.0300 A 340627.0000 D Common 2020-12-31 4 M 0 7918.0000 0 A 348545.0000 D Common 2020-12-31 4 M 0 2891.0000 40.6800 A 351436.0000 D Common 2020-12-31 4 M 0 211.0000 27.0300 A 351647.0000 D Common 2020-12-31 4 S 0 211.0000 74.1471 D 351436.0000 D Common 2020-12-31 4 S 0 2891.0000 74.0858 D 348545.0000 D Common 2020-12-31 4 F 0 3825.0000 74.3300 D 344720.0000 D Common 2020-12-31 4 S 0 13801.0000 73.4068 D 330919.0000 D Common 2020-12-31 4 F 0 20725.0000 74.3300 D 310194.0000 D Common 2020-12-31 4 S 0 52098.0000 73.3713 D 258096.0000 D Nonqualified Stock Options 40.6800 2020-12-31 4 M 0 2891.0000 0.0000 D 2024-03-17 Common 2891.0000 52098.0000 D Nonqualified Stock Options 40.6800 2020-12-31 4 M 0 52098.0000 0.0000 D 2024-03-17 Common 52098.0000 0.0000 D Nonqualified Stock Options 27.0300 2020-12-31 4 M 0 211.0000 0.0000 D 2023-03-18 Common 211.0000 13801.0000 D Nonqualified Stock Options 27.0300 2020-12-31 4 M 0 13801.0000 0.0000 D 2023-03-18 Common 13801.0000 0.0000 D Restricted Stock Units 2020-12-31 4 M 0 7918.0000 D Common 7918.0000 42900.0000 D Restricted Stock Units 2020-12-31 4 M 0 42900.0000 D Common 42900.0000 0.0000 D The exercise price for the restricted stock unit exercise was $74.33. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 10/5/2020. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $74.04 to $74.51, 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 footnotes (1) and (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.90 to $74.68, 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 footnotes (1) and (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $72.92 to $73.91, 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 footnotes (1) and (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $72.89 to $73.87, 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 footnotes (1) and (2) to this Form 4. Represents options under the terms of the 2010 Omnibus Incentive Plan of which the options vested in three equal annual installments beginning on March 17, 2015. Represents options under the terms of the 2010 Omnibus Incentive Plan of which the options vested in three equal annual installments beginning on March 18, 2014. Represents accelerated vesting, due to retirement, of restricted stock units granted pursuant to the 2010 Omnibus Incentive Plan, as amended. Represents accelerated vesting, due to retirement, of restricted stock units granted pursuant to the 2018 Omnibus Incentive Plan, as amended. /s/ James E. Daniel, Attorney-in-fact 2021-01-05