Donaldson Duncan

Altera Infrastructure LP engages in the provision of marine transportation, oil production and storage services to the offshore oil industry. It operates through the following segments: FPSO, Shuttle Tanker, FSO, UMS, and Towage and Offshore Installation Vessels. The FPSO segment involves the offshore production facilities that are ship-shaped or cylindrical-shaped and store processed crude oil in tanks located in the hull of the vessel. The Shuttle Tanker segment offers ships designed to transport crude oil and condensates from offshore oil field installations to onshore terminals and refineries. The FSO segment provides on-site storage for oil field installations that have no storage facilities or that require supplemental storage. The UMS segment includes maintenance and safety used for offshore accommodation, storage and support for maintenance and modification projects on existing offshore installations. The Towage & Offshore Installation Vessels segment comprises of towing and offshore installation vessels used for the towage, station-keeping, installation and decommissioning of large floating objects such as exploration, production and storage units. The company was founded on August 31, 2006 and is headquartered in Westhill, the United Kingdom.

Maersk Drilling, Inc. provides drilling services to oil companies. The private company is based in Houston.