X0303 4 2010-09-30 0000314808 Ensco plc ESV 0001436960 Burns John Mark 6 CHESTERFIELD GARDENS 3RD FLOOR LONDON X0 W1J 5BQ UNITED KINGDOM 0 1 0 0 Senior Vice President American Depositary Shares 2010-09-30 4 F 0 3595 44.73 D 75544 D American Depositary Shares 2010-08-31 4 A 0 381.7482 35.88 A 2104.955 I Ensco Savings and Retirement Plans Amount is representative of American Depositary Shares surrendered for tax purposes upon vesting of restricted shares which took place on 09/30/2010. Amount is representative of Ensco American Depositary Shares acquired, and held indirectly, through normal payroll contributions to the Ensco Savings and Retirement Plans for the months of January through August 2010. Price of Securities dependent upon trading price applicable on date of future transactions. The average cost/price is representative of all benefically, indirectly owned securities acquired via normal payroll contributions to the Ensco Savings and Retirement Plans. Amount is representative of Ensco American Depositary Shares acquired, and held indirectly, via the Ensco Non-employee Director Deferred Compensation Plan as of 08/31/2010. /s/ Robert O. Isaac, by Power of Attorney 2010-10-01