Ocean Rig UDW Inc. was an operator of semi-submersible oil platforms and underwater drillships and was based in Athens. In 2018, the company was acquired by Transocean. The company owned 2 semi-submersibles and 4 ultra deepwater drillships. The company was majority owned by DryShips, controlled by George Economou. The company was established in 1996 as Ocean Rig ASA. Between 1997 and 2008, the company was listed on the Oslo Stock Exchange. In 2010, shares in the company were spun off by DryShips and the company was listed on NASDAQ. More information...
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