Stein E. Giljarhus

Petroleum Services Group AS is a holding company, which engages in the construction and engineering project management. It also provides rig procurement, tailored training, software and consultancy manpower. The company was founded in 1987 and is headquartered in Oslo, Norway.

Jasper Offshore (Cyprus) Ltd. provides offshore drilling services. The company was founded in 2002 and is headquartered in Nicosia, Cyprus.

Sevan Drilling ASA operates as an offshore drilling contractor, which engages in building and operating ultra deepwater drill rigs. It operates through three business segments: Operations, Construction in Progress and Other. The company was founded on May 31, 2006 and is headquartered in Oslo, Norway.

Transocean, Inc. provides offshore contract drilling services for oil and gas wells. It offers engineering and project management services. The firm specializes in deepwater and harsh environment drilling solutions. The company was founded in 1953 and is headquartered in Houston, TX.

Greka Drilling Ltd. is an investment holding company, which through its subsidiaries, engages in the provision of drilling services. It operates through the Provision of Contract Drilling Services in the PRC, and India. The company was founded by Randeep S. Grewal in November 2007 and is headquartered in Zhengzhou, China.