X0306 4 2013-05-16 0001509991 Kosmos Energy Ltd. KOS 0001517321 Dailly Paul A C/O KOSMOS ENERGY, LLC 8176 PARK LANE, SUITE 500 DALLAS TX 75231 0 1 0 0 SVP, Chief Geoscientist Common Shares 2013-05-16 4 F 0 150162 11.52 D 5409580 D Common Shares 1514666 I See footnote These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted shares granted to the reporting person under the Issuer's Long Term Incentive Plan. These shares are directly owned by Dailly-Simmie Ventures, Ltd., an entity controlled by the reporting person. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. /s/ Phillip Feiner, as Attorney-in-Fact 2013-05-20