Seadrill Limited is an offshore drilling contractor providing offshore drilling services to the oil and gas industry. The Company's primary business is the ownership and operation of drillships, semi-submersible rigs and jack-up rigs for operations in shallow and deep water areas, as well as benign and harsh environments. The Company has three operating segments: Floaters, Jack-ups rigs and Other. The Company's Floaters segment includes drillships and semi-submersible rigs. The Company's Jack-ups rigs segment includes jack-up rigs. The Company's Other segment consists primarily of rig management services. The Company, through its subsidiaries, owns and operates its offshore drilling units and makes investments in other offshore drilling and oil services companies. Its subsidiaries include North Atlantic Drilling Ltd, Sevan Drilling ASA and Asia Offshore Drilling. It owns and operates approximately 43 offshore drilling units and has 16 offshore drilling units under construction.