Seadrill Limited provides offshore drilling services to the oil and gas industry worldwide. The company owns and operates drill ships and semi-submersible rigs for operations in shallow and ultra-deep water in benign and harsh environments. It serves oil super-majors, state-owned national oil companies, and independent oil and gas companies. The company was formerly known as Seadrill 2021 Limited. Seadrill Limited was incorporated in 2005 and is based in Houston, Texas.