Ocean Rig UDW Inc. is an international offshore drilling contractor operating solely in the ultra-deep water and harsh-environment segments of the offshore drilling industry. The company owns and operates a total of 9 ultra-deep water offshore drilling units including two 5th generation ultra-deep water semi-submersible drilling rigs, four 6th generation ultra-deep water drill-ships, and three 7th generation ultra-deep water drill-ships which will be delivered to the company and made operational during 2013. Ocean Rig’s common stock is listed on the NASDAQ Global Select Market where it trades under the symbol “ORIG.”