X0306 4 2017-03-20 0001362004 ICF International, Inc. ICFI 0001376429 Kesavan Sudhakar 9300 LEE HIGHWAY FAIRFAX VA 22031 1 1 Chairman & CEO Common 2017-03-20 4 S 0 3.0000 41.5000 D 146716.0000 D Common 2017-03-20 4 S 0 100.0000 41.9000 D 146616.0000 D Common 2017-03-20 4 S 0 100.0000 41.8000 D 146516.0000 D Common 2017-03-20 4 S 0 100.0000 41.6500 D 146416.0000 D Common 2017-03-20 4 S 0 100.0000 41.6250 D 146316.0000 D Common 2017-03-20 4 S 0 100.0000 41.6000 D 146216.0000 D Common 2017-03-20 4 S 0 100.0000 41.5500 D 146116.0000 D Common 2017-03-20 4 S 0 100.0000 41.4000 D 146016.0000 D Common 2017-03-20 4 S 0 188.0000 41.4250 D 145828.0000 D Common 2017-03-20 4 S 0 200.0000 41.7000 D 145628.0000 D Common 2017-03-21 4 M 0 5681.0000 40.6000 A 151309.0000 D Common 2017-03-21 4 M 0 4034.0000 40.6000 A 155343.0000 D Common 2017-03-21 4 F 0 2054.0000 40.6000 D 153289.0000 D Common 2017-03-21 4 F 0 2892.0000 40.6000 D 150397.0000 D Restricted Stock Units 2017-03-20 4 A 0 19944.0000 0.0000 A Common 19944.0000 104712.0000 D Restricted Stock Units 2017-03-20 4 A 0 14742.0000 0.0000 A Common 14742.0000 119454.0000 D Restricted Stock Units 2017-03-21 4 M 0 4034.0000 D Common 4034.0000 115420.0000 D Restricted Stock Units 2017-03-21 4 M 0 5681.0000 D Common 5681.0000 109739.0000 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 10, 2014. Each restricted stock unit is the economic equivalent of one share of ICF International, Inc.'s Common Stock. These acquired restricted stock units were granted pursuant to ICF International, Inc.'s 2010 Omnibus Incentive Plan, as amended. These restricted stock units vest over a period of three (3) years, at 25% on each of the first two anniversaries of the grant and 50% on the third anniversary from the day of grant. The exercise price for the restricted stock unit exercise was $40.60. Represents the first vesting anniversary (25%) of acquired restricted stock units granted pursuant to the 2010 Omnibus Incentive Plan, as amended. /s/ James E. Daniel, Attorney-in-fact 2017-03-22