Ensco plc (Ensco) is a provider of offshore contract drilling services to the international oil and gas industry. As of December 31, 2011, the Company owned and operated an offshore drilling rig fleet of 77 rigs, including rigs under construction. As of December 31, 2011, its rig fleet included seven drillships, 13 dynamically positioned semisubmersible rigs, seven moored semisubmersible rigs, 49 jackup rigs and one barge rig. Its customers include national and international oil companies. On May 31, 2011, the Company completed a merger transaction (the Merger) with Pride International, Inc., (Pride), ENSCO International Incorporated, an indirect, wholly owned subsidiary and predecessor of Ensco plc (Ensco Delaware), and ENSCO Ventures LLC, an indirect, wholly owned subsidiary of Ensco plc (Merger Sub). Pursuant to the Agreement and Plan of Merger, Merger Sub merged with and into Pride, with Pride as the surviving entity and an indirect, wholly owned subsidiary of Ensco plc.