X0303 4 2011-06-01 0000314808 Ensco plc ESV 0001445438 Manko Douglas John 500 N. AKARD STREET SUITE 4300 DALLAS TX 75201-3331 0 1 0 0 Controller American Depositary Shares 2011-06-01 4 A 0 3225 0 A 24481 D American Depositary Shares 2011-06-01 4 F 0 604 54.30 D 23877 D The reporting person disposed of these shares directly to the issuer upon the vesting of previously awarded restricted stock. The purpose of the disposition was to enable the reporting person to satisfy tax withholding obligations that arose upon such vesting, which will be paid by the issuer to the Internal Revenue Service in cash. /s/ Cary A. Moomjian, Jr., by Power of Attorney 2011-06-03