X0203 3 2010-07-01 0 0000314808 Ensco plc ESV 0001495170 Knowlton John Stokes 500 N. AKARD STREET SUITE 4300 DALLAS TX 75201-3331 0 1 0 0 Vice President - Engineering American Depositary Shares 54959 D American Depositary Shares 155.1 I Ensco Savings and Retirement Plans Employee Stock Option (Right to Buy) 33.545 2006-06-01 2012-06-01 American Depositary Shares 3000 D Employee Stock Option (Right to Buy) 46.36 2007-07-03 2013-07-03 American Depositary Shares 24000 D Amount includes an Employee Restricted American Depositary Shares Grant of 11,665, which was granted effective July 1, 2010. The Employee Restricted American Depositary Shares Grant vest at a rate of 20% per annum on the anniversary date of the grant and is fully vested in five (5) years. The Employee Stock Option (Right to Buy) was granted June 1, 2005 and is fully vested. Amount is representative of the number of unexercised options remaining out of a total grant of 12,000. The Employee Stock Option (Right to Buy) was granted July 3, 2006 and is fully vested. Amount is representative of the number of unexercised options remaining out of a total grant of 32,000. /s/ Cary A. Moomjian, Jr., by Power of Attorney 2010-07-06