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.

Aker Solutions is a provider of products, systems and services to the oil and gas industry. Through its subsidiaries, Co. is engaged in the field of engineering, design and technology aimed at improving production and recovery. Co. has 3 reportable segments which are the strategic business units of the group: Engineering Solutions (provides concept and front-end studies to oil companies), Product Solutions (delivers oilfield products for the entire upstream value chain, from reservoir through processing), and Field-Life Solutions (offers a range of services, which has the ultimate objective to increase oil and gas recovery from existing fields and extend the operating life of field assets).

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.

BW Offshore Limited. BW Offshore Limited is a Bermuda-based company. The Company, through its subsidiaries, owns and operates oil and gas floating production, storage and offloading vessels (FPSOs) and floating, storage and offloading vessels (FSOs). It also focuses on field developments of discovered oil and gas fields. The Company operates across Europe, Asia Pacific, West Africa and the Americas. The Company is comprised of BW Offshore, BW LPG, BW Pacific, BW LNG, BW VLCC, BW Chemical Tankers, BW Dry Cargo and BW Fleet Management. It owns a fleet of 15 FPSOs and one FSO, operating in West Africa, Brazil, Gulf of Mexico, Indonesia, New Zealand and in the North Sea. Its owned fleet includes the vessels, such as BW pioneer, , Yuum K'ak Naab, Pemex, BW Cidade De Sao Vicente, FPSO Polvo, Berge Helene, Abo FPSO, Sendje Berge, Espoir Ivoirien, Petroleo Nautipa, BW Athena, BW Catcher (Premier Oil), and BW Adolo( BW energy).

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.

Maersk Drilling A/S is a Denmark-based company, which provides integrated offshore drilling rig services to oil and gas companies around the world in support of their exploration and production of oil and gas. The Company's owns more than 20 rigs including environment jack-up rigs, as well as deepwater drillships and deepwater semi-submersible rigs. The Company operates in Africa and Middle East, the Americas, Asia-Pacific, Norway and the North Sea.

Magseis Fairfield ASA, formerly Magseis ASA, is a Norway-based company engaged in geophysical surveying and mapping. The Company specializes in Ocean Bottom Seismic (OBS) acquisition services dedicated to the oil and gas industry. The Company's Marine Autonomous Seismic System (MASS) consists of the in-sea cable and sensor capsules, automated handling and data download. Together with a range of miniaturized Fairfield Z-nodes, it enables operations in water depths to 3000 meters. The Company divides its operations into six regions, namely Barents Sea (Norway), Malaysia, Singapore, the Red Sea, United Kingdom and Sweden. It has offices in Norway, Sweden, the United Kingdom, Brazil, Singapore and the United States.

Northern Drilling Ltd is a Bermuda-based drilling contractor, which owns a semi-submersible rig, HHI HE Semi 1, previously known as West Mira. HHI HE Semi 1 possesses water depth capacity of 10,000 foot and drilling depth equipped for 40,000 foot. The Company's shareholders comprise Hemen Holding Ltd, Morgan Stanley & Co. Int. Plc and State Street Bank and Trust Comp.

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.

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.

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.

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.