OCR UDW Announces Commencement of "Regular Way" Trading

Nicosia, Cyprus –October 6, 2011 – Ocean Rig UDW Inc. (the “Company” or “Ocean Rig”) (Nasdaq:ORIG), a global provider of offshore deepwater drilling services, announced that its common shares are expected to commence “regular way” trading today on the Nasdaq Global Select Market under the ticker symbol “ORIG”.

About Ocean Rig
Ocean Rig is an international offshore drilling contractor providing oilfield services for offshore oil and gas exploration, development and production drilling, and specializing in the ultra-deepwater and harsh-environment segment of the offshore drilling industry. The company owns and operates 9 offshore ultra deepwater drilling units, comprising of 2 ultra deepwater semisubmersible drilling rigs and 7 ultra deepwater drillships, 3 of which remain to be delivered to the company during 2013. Visit the Company’s website at www.ocean-rig.com.

Ocean Rig press release