X0303 4 2011-03-01 0000314808 Ensco plc ESV 0001443266 Lowe Patrick Carey 6 CHESTERFIELD GARDENS 3RD FLOOR LONDON X0 W1J 5BQ UNITED KINGDOM 0 1 0 0 Senior Vice President American Depositary Shares 2011-03-01 4 A 0 7350 55.34 A 92886 D Employee American Depositary Shares Option (Right to Buy) 55.34 2011-03-01 4 A 0 10530 0 A 2012-03-01 2015-03-01 American Depositary Shares 10530 10530 D Amount is representative of an Employee Restricted American Depositary Shares Grant with an effective date of 03/01/2011. The Employee Restricted American Depositary Shares Grant vest at a rate of 33.3% per annum on the anniversary date of the grant and is fully vested in three (3) years. Amount is representative of an Employee American Depositary Shares Option Grant with an effective date of 03/01/2011. The Employee American Depositary Shares Option Grant vest at a rate of 33.3% per annum on the anniversary date of the grant and is fully vested in three (3) years. /s/ Robert O. Isaac, by Power of Attorney 2011-03-03