X0303 4 2011-06-01 0000314808 Ensco plc ESV 0001443266 Lowe Patrick Carey 6 CHESTERFIELD GARDENS 3RD FLOOR LONDON X0 W1J 5BQ UNITED KINGDOM 0 1 0 0 Sr. VP - Eastern Hemisphere American Depositary Shares 2011-06-01 4 F 0 2632 54.30 D 90254 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