Akastor is a provider of products, systems and services to the oil and gas industry. Co. has three reportable segments: Engineering Solutions, which provides concept and front-end studies to oil companies; Product Solutions, which delivers oilfield products for the entire upstream value chain, from reservoir through processing and also includes Subsea, Drilling, Umbilicals and Process Systems; and Field-Life Solutions, which provides a range of services to increase oil and gas recovery from existing fields and extend the operating life of field assets. This segment also consists of two business areas: Maintenance, Modifications and Operations and Oilfield Services and Marine Assets.

Aker is an industrial investment company that exercises active ownership. Co. organizes its business activities in two segments: Industrial holdings and Financial investments. The industrial holdings comprise Co.'s ownership interests in Aker Solutions ASA, Kvaerner ASA, Det norske oljeselskap ASA, Ocean Yield ASA, Aker BioMarine ASA and Havfisk ASA. The financial investments comprise cash, real estate, investments in funds and other financial assets of Co. and holding companies, with the exception of industrial equity investments. Co.'s ownership interests are concentrated in the oil and gas, fisheries/marine biotechnology, maritime assets and finance sectors.

Awilco Drilling is engaged in the ownership of offshore drilling rigs for use in offshore drilling operations, and to provide drilling services for oil and gas companies using these rigs. As of Dec 31 2016, Co. owned and operated two semi-submersible drilling rigs, the WilPhoenix and WilHunter, which both rigs used in the drilling of oil and gas wells in the U.K. sector of the North Sea.

CGG is a global participant in the geophysical seismic industry. Co. manufactures geophysical equipment and provides marine, land, and airborne data acquisition services. Co. also provides geosciences services, including data imaging, seismic data characterization, geosciences and petroleum engineering consulting services, and collecting, developing and licensing geological data. Co.'s clients are in oil and gas exploration and production industies. Co. divides its activities into four segments: Equipment, Contractual Data Acquisition, Geology, Geophysics and Reservoir (GGR), and Non-Operated Resources, including eight business lines, six Corporate functions, and four Group Departments.

Diamond Offshore Drilling provides contract drilling services to the energy industry around the globe. The company's fleet enables it to provide services in the floater market on a worldwide basis. The company's contracts to provide offshore drilling services vary in their terms and provisions. The principal markets for the company's offshore contract drilling services are: the Gulf of Mexico, including the U.S., and Mexico; South America, principally offshore Brazil, and Trinidad and Tobago; Australia and Southeast Asia, including Malaysia, Indonesia, Myanmar and Vietnam; Europe, principally offshore the U.K., and Norway; East and West Africa; and the Mediterranean.

DOF is the parent company in DOF's group of companies which owns and operates a fleet of supply and subsea vessels as well as having the engineering capacity to service the subsea market. Co. operates worldwide and provides services to the global oil and gas industry. Co. operates in three segments of the offshore service market. These are defined by types of activities and vessel types: Platform Supply Vessels, Anchor Handling Tug Supply Vessels and Subsea Vessels and Subsea Engineering. The subsea engineering activities among others comprise Survey and Positioning, Inspection, Repair and Maintenance Services, Construction Support, Diving Services and Mooring Projects.

Fred Olsen Energy is engaged in offshore drilling as well as engineering and fabrication services. Co. provides services and operates within the two segments; offshore drilling and engineering and fabrication. The Offshore Drilling segment provides services to the offshore oil and gas industry. The Engineering and Fabrication segment provides engineering, fabrication, ship building and repair services for various offshore and onshore industries.

Eidesvik Offshore ASA is a Norway-based company engaged in the maritime sector. It specializes in the offshore logistics, seismic and underwater operations. The Company owns and operates vessels under long-term contracts in three business segments: Platform Supply Vessels (PSV), managing Viking Athene, Viking Fighter, Viking Prince, and Viking Energy, among others; Seismic, such as Oceanic Sirius, Vantage and Viking Vision, which are commercially operated by CGG Eidesvik Ship Management AS; and Subsea, including Acergy Viking, Viking Poseidon, and Subsea Viking, among others. The Company operates worldwide through a number of subsidiaries, including Eidesvik AS, Eidesvik Shipping AS, Eidesvik Subsea Vessels AS, Norsk Rederihelsetjeneste AS, Hordaland Maritime Miljoselskap AS and Viking Surf AS. Furthermore, It participates also in a joint venture with Eidesvik Seven AS and Eidesvik Seven Chartering AS.

Kvaerner is an industrial investment company, consisting of various operational and non-operational interests. Through its controlling interest in Aker ASA, Co. is engaged in providing services related to design, construction, maintenance, modification and operation of both large and small industrial facilities. The business spans a number of industries, including oil and gas upstream and downstream, process, pharmaceuticals, metals, power, chemical, pulping, environmental technologies and shipbuilding. Co.'s indirect activities in are divided into three business areas: Oil & Gas, Engineering & Construction and Shipbuilding.

Sevan Marine and its subsidiaries provide technology, design and engineering services to customers in the offshore oil and gas markets. Co. provides the characteristic, proprietary cylindrical hull design known as the Sevan design. Co. continues to focus on the design, engineering and project execution of floating units for offshore applications, with a main focus on floating, production, storage and offloading units, as well as floating, storage and offloading units and floating, liquefied, natural gas units.

Ocean Rig UDW is an international offshore drilling contractor providing oilfield services for offshore oil and gas exploration, development and production drilling and specializing in ultra-deepwater and harsh-environment drilling. Co. owns and operates two modern, fifth generation ultra-deepwater semi-submersible offshore drilling rigs, the Leiv Eiriksson and the Eirik Raude, five sixth generation advanced capability ultra-deepwater drilling units, the Ocean Rig Corcovado, the Ocean Rig Olympia, the Ocean Rig Poseidon and the Ocean Rig Mykonos and four seventh generation drilling units, the Ocean Rig Mylos, the Ocean Rig Skyros, the Ocean Rig Athena and the Ocean Rig Apollo.

Ocean Yield provides investments in vessels within oil-service and industrial shipping industry. Co. is a ship-owning company with investments in vessels on long-term charters.

Odfjell Drilling Ltd. (Odfjell Drilling) is an integrated offshore drilling and oil service company. The Company operates through three segments: Mobile Offshore Drilling Units (MODU), Drilling & Technology, and Well Services. The Mobile Offshore Drilling Units is responsible for operations of mobile drilling units fully or partly owned by the Company and units owned by other companies. It operates mobile drilling units in Norway, United Kingdom, Angola, Vietnam and Brazil. The Drilling & Technology segment is providing platform drilling, project management and engineering services. Drilling & Technology operates from offices in Bergen, Stavanger and Aberdeen. The Well Services segment is a provider of casing and tubing running services (TRS), drill tool rental and well intervention services to the onshore and offshore oil and gas industry. The Well Services are provided to onshore and offshore drilling operations in the North Sea, mainland Europe and Black Sea, among others.

Pacific Drilling is an international offshore drilling company committed to providing drilling services to the oil and natural gas industry through the use of high-specification rigs. Co.'s primary business is to contract its high-specification rigs, related equipment and work crews, primarily on a dayrate basis, to drill wells for Co.'s customers. Co. operates five drillships under client contract and has three drillships available. All of Co.'s drillships are self-propelled and dynamically positioned and have large carrying capacity. Co.'s five existing drillships are committed to work in the deepwater regions of the Gulf of Mexico, Brazil and Nigeria.

Petroleum Geo-Services is engaged in providing geophysical services and oil and gas production services. As of Dec. 31, 2001, Co. operated six Ramform design vessels in its marine seismic data acquisition operations.

Prosafe is a supplier of products and services in selected niches of the global oil and gas industry, specifically in the high end of the global offshore accommodation/service industry. Co.'s operations comprise a parent company and the business division Offshore Support Services, a global owner and operator of semi-sumbersible accommodation/service rigs. Co. owns 11 of 16 available units. These rigs serve charters with five units in the North Sea, five units in the Gulf of Mexico, and one unit in the Philippines. In addition, the division owns one jack-up accommodation/service rig.

Saipem is a global contractor with local presence in Africa, Central Asia, America, the Middle East and South East Asia. Co. provides engineering, procurement, construction and installation services; and engineering, procurement and construction services to the oil and gas industry, both onshore and offshore, with a focus on projects, including activities in remote areas, in deep waters and on projects that involve difficult gas or crude supplies.

Solstad Farstad is a holding company. Through its subsidiaries, Co. is engaged in the operation of offshore service and construction vessels. Co.'s business is divided into three segments based on the different types of vessels: Anchor-Handling Vessels delivering services related to rig moves and anchoring of rigs and other devices at sea, Platform Supply Vessels delivering services relating to transportation of material to offshore installations and Construction Service Vessels delivering services relating to development of both sub sea and floating installations. As of Dec 31 2009, Co. operated a fleet of 50 wholly owned, jointly owned and leased vessels.

Spectrum ASA is a Norway-based company, which provides seismic data and seismic imaging services to the global oil and gas industry. It operates within two divisions, namely Multi-Client services and Seismic Imaging. The Company's library of Multi-Client data specializes in regional coverage and includes projects from oil producing regions of the world. The Seismic Imaging offers data processing services, such as time imaging, velocity analysis, depth imaging and model building, among others. The Company is organized into four regions: North and South America, North West Europe and Africa, Mediterranean and Middle East, and Asia Pacific.The Company wholly owned six subsidiaries, such as Spectrum Geo Ltd, Fugro, Carmot Seismic AS, Carmot Processing AS, Spectrum Geo Inc and Spectrum Geo Pte Ltd, among others, as well as had two dormant joint ventures.

Subsea 7 is a provider of seabed-to-surface engineering, construction and services contractor to the offshore energy industry. Co. provides products and services required for subsea field development, including project management, design and engineering, procurement, fabrication, survey, installation, and commissioning of production facilities on the seabed and the tie-back of these facilities to fixed or floating platforms or to the shore. Co. also provides products and capabilities to deliver full Life of Field services to its clients. Through its i-Tech Division, Co. provides remotely operated vehicles and tooling services to support exploration, production and drilling activities.

TechnipFMC is global leader in oil and gas projects, technologies, systems, and services. Co. offers subsea, surface, onshore, and offshore solutions for oil and gas projects. Co. serves customers worldwide. With Co.'s technologies and production systems, integrated expertise, and comprehensive solutions, Co. is transforming Co.'s clients' project economics. Co. is uniquely positioned to deliver greater efficiency across project lifecycles from concept to project delivery and beyond. Through innovative technologies and improved efficiencies, Co.'s offering unlocks new possibilities for Co.'s clients in developing their oil and gas resources.

TGS Nopec Geophysical provides geoscience data to oil and gas exploration and production companies worldwide. In addition to global geophysical and geological data libraries that include seismic data, magnetic and gravity data, digital well logs, production data and directional surveys, Co. also provides advanced processing and imaging services, interpretation products, permanent reservoir monitoring and data integration solutions.

Ensco is an offshore contract drilling company engaged in providing offshore contract drilling services to the international oil and gas industry. As of Dec 31 2017, Co. owned and operated an offshore drilling rig fleet of 62 rigs. Co.'s rig fleet includes 12 drillships, 11 semisubmersible rigs, four moored semisubmersible rigs and 38 jackup rigs, including rigs under construction. Co.'s business consists of three operating segments: floaters, which includes its drillships and semisubmersible rigs; jackups; and other, which consists of management services on rigs owned by third-parties. Co.'s two reportable segments, floaters and jackups, provide one service, contract drilling.