Ensco plc and Atwood Oceanics, Inc. jointly announced that they have received notice from the Department of Justice and the Federal Trade Commission granting early termination of the waiting period under the U.S. Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (HSR Act), with respect to the proposed merger previously announced on 30 May 2017 pursuant to which Ensco will acquire Atwood in a stock transaction. Accordingly, the merger closing condition with respect to the expiration or termination of the waiting period under the HSR Act has been satisfied. Completion of the merger remains subject to satisfaction or waiver of certain other conditions, including approval by the shareholders of both Ensco and Atwood.

About Ensco

Ensco plc (NYSE: ESV) brings energy to the world as a global provider of offshore drilling services to the petroleum industry. For more than 30 years, the company has focused on operating safely and going beyond customer expectations. Ensco is ranked first in total customer satisfaction in the latest independent survey by EnergyPoint Research — the seventh consecutive year that Ensco has earned this distinction. Operating one of the newest ultra-deepwater rig fleets and a leading premium jackup fleet, Ensco has a major presence in the most strategic offshore basins across six continents. Ensco is an English limited company (England No. 7023598) with its corporate headquarters located at 6 Chesterfield Gardens, London W1J 5BQ. To learn more, visit our website at www.enscoplc.com.

About Atwood

Atwood Oceanics, Inc. (NYSE: ATW) is a leading offshore drilling company engaged in the drilling and completion of exploration and development wells for the global oil and gas industry. Atwood currently owns 10 mobile offshore drilling units and is constructing two ultra-deepwater drillships. Atwood was founded in 1968 and is headquartered in Houston, Texas.