On the Record · Transocean
Transocean subsidiaries, as it lists them
The subsidiaries Transocean lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| 15375 Memorial Corporation | Delaware |
| Aguas Profundas, Limitada | Angola |
| Deepwater Drilling Company (Offshore Services) Ltd | Bermuda |
| AngoSantaFe - Prestacao de Servicos Petroliferos, Limitada | Angola |
| Arcade Drilling AS | Norway |
| Asie Sonat Offshore Sdn. Bhd. | Malaysia |
| Challenger Minerals Inc. | California |
| Deepwater Drilling (Transocean Ghana) LTD | Ghana |
| Deepwater Drilling North Africa LLC - Free Zone | Egypt |
| Deepwater Pacific 1 Limited | Bermuda |
| Deepwater Supply Inc. | Delaware |
| Drillship Alonissos Owners Limited | Bermuda |
| Drillship Paros Owners Limited | Bermuda |
| Drillship Skyros Owners Limited | Bermuda |
| Entities Holdings, Inc. | Delaware |
| Global Marine Inc. | Delaware |
| Global Offshore Drilling Limited | Nigeria |
| GlobalSantaFe B.V. | Netherlands |
| GlobalSantaFe Denmark Holdings ApS | Denmark |
| GlobalSantaFe Drilling (N.A.) N.V. | Netherlands Antilles |
| GlobalSantaFe Drilling Company | Delaware |
| GlobalSantaFe Drilling Mexico, S. de R.L. de C.V. | Mexico |
| GlobalSantaFe Drilling Trinidad LLC | Delaware |
| GlobalSantaFe Drilling Venezuela, C.A. | Venezuela |
| GlobalSantaFe Financial Services (Luxembourg) S.a.r.l. | Luxembourg |
| GlobalSantaFe Group Financing Limited Liability Company | Hungary |
| GlobalSantaFe Hungary Services Limited Liability Company | Hungary |
| GlobalSantaFe International Drilling Corporation Limited | Bermuda |
| GlobalSantaFe International Drilling Limited | Bermuda |
| GlobalSantaFe International Services Limited | Bermuda |
| GlobalSantaFe Nederland B.V. | Netherlands |
| GlobalSantaFe Offshore Services Limited | Bermuda |
| GlobalSantaFe Operations (Mexico) LLC | Delaware |
| GlobalSantaFe Saudi Arabia Ltd. | Bermuda |
| GlobalSantaFe Services (BVI) Limited | Bermuda |
| GlobalSantaFe Services Netherlands B.V. | Netherlands |
| GlobalSantaFe Servicios de Venezuela, C.A. | Venezuela |
| GlobalSantaFe South America LLC | Delaware |
| GlobalSantaFe U.S. Holdings Inc. | Delaware |
| GSF Leasing Services GmbH | Switzerland |
| Indigo Drilling Limited | Nigeria |
| Inteliwell Limited | England & Wales |
| Liquila DWA LLC | Hungary |
| Ocean Rig Management Limited | Bermuda |
| Ocean Rig Operations Limited | Bermuda |
| Ocean Rig UDW Limited | Bermuda |
| Offshore Ghana Transocean LTD | Ghana |
| Olympia Rig Angola Holding, S.A. | Angola |
| Olympia Rig Angola, Limitada | Angola |
| OR Norge Operations Inc. | Marshall Islands |
| Platform Capital N.V. | Netherlands Antilles |
| Platform Financial N.V. | Netherlands Antilles |
| Primelead Limited | Cyprus |
| PT SantaFe Subsea Indonesia | Indonesia |
| PT. Transocean Indonesia | Indonesia |
| R&B Falcon (A) Pty Ltd | Western Australia |
| R&B Falcon (Caledonia) Limited | England & Wales |
| R&B Falcon (U.K.) Limited | England & Wales |
| R&B Falcon Exploration Co., LLC | Oklahoma |
| Ranger Insurance Limited | Bermuda |
| RBF Rig Corporation, LLC | Delaware |
| Reading & Bates Coal Co., LLC | Nevada |
| Santa Fe Braun Inc. | Delaware |
| Santa Fe Construction Company | Delaware |
| Santa Fe Drilling Company of Venezuela, C.A. | California |
| Saudi Drilling Company Limited | Saudi Arabia |
| Sedco Forex International Limited | Bermuda |
| Servicios Petroleros Santa Fe, S.A. | Venezuela |
| Songa Offshore Delta Limited | Cyprus |
| Songa Offshore Drilling Limited | Cyprus |
| Songa Offshore Enabler Limited | Cyprus |
| Songa Offshore Encourage Limited | Cyprus |
| Songa Offshore Endurance Limited | Cyprus |
| Songa Offshore Equinox Limited | Cyprus |
| Songa Offshore Management Limited | Cyprus |
| Songa Offshore Pte. Ltd. | Singapore |
| Songa Offshore Rig 2 AS | Norway |
| Songa Offshore Rig 3 AS | Norway |
| Songa Offshore Saturn Limited | Cyprus |
| Songa Offshore SE | Cyprus |
| T. I. International Mexico, S. de R.L. de C.V. | Mexico |
| TILAM Holdings Limited | Bermuda |
| Transocean Africa Drilling Limited | Bermuda |
| Transocean Aquila Limited | Bermuda |
| Transocean Asia Services Sdn. Bhd. | Malaysia |
| Transocean Asset Holdings 1 Limited | Bermuda |
| Transocean Asset Holdings 2 Limited | Bermuda |
| Transocean Asset Holdings 3 Limited | Bermuda |
| Transocean Atlas Limited | Bermuda |
| Transocean Barents ASA | Norway |
| Transocean Brasil Ltda. | Brazil |
| Transocean Britannia Limited | Bermuda |
| Transocean Canada Drilling Services Ltd. | Nova Scotia |
| Transocean Cayman Management Services Limited | Cayman Islands |
| Transocean Conqueror Limited | Bermuda |
| Transocean Conqueror Opco LLC | Delaware |
| Transocean Corporate Services Limited | Cayman Islands |
| Transocean Cyprus Capital Management Public Limited | Cyprus |
| Transocean Deepwater Drilling Services Limited | Bermuda |
| Transocean Deepwater Holdings Limited | Bermuda |
| Transocean Deepwater Inc. | Delaware |
| Transocean Deepwater Mauritius | Mauritius |
| Transocean Deepwater Seafarer Services Limited | Bermuda |
| Transocean Discoverer 534 LLC | Delaware |
| Transocean Drilling Enterprises S.a r.l. | Luxembourg |
| Transocean Drilling Namibia Limited | Bermuda |
| Transocean Drilling Offshore S.a r.l. | Luxembourg |
| Transocean Drilling Sdn. Bhd. | Malaysia |
| Transocean Drilling Services (India) Private Limited | India |
| Transocean Drilling U.K. Limited | Scotland |
| Transocean Eastern Pte. Ltd. | Singapore |
| Transocean Employee Support Fund | Texas |
| Transocean Enabler Financing Limited | Bermuda |
| Transocean Enabler Limited | Bermuda |
| Transocean Encourage Financing Limited | Bermuda |
| Transocean Encourage Limited | Bermuda |
| Transocean Entities Holdings GmbH | Switzerland |
| Transocean Explorer Services, LLC | Delaware |
| Transocean Finance Limited | Bermuda |
| Transocean Financing (Cayman) Limited | Bermuda |
| Transocean Guardian Limited | Bermuda |
| Transocean Holdings 1 Limited | Bermuda |
| Transocean Holdings 2 Limited | Bermuda |
| Transocean Holdings 3 Limited | Bermuda |
| Transocean Hungary Holdings LLC | Hungary |
| Transocean Hungary Ventures LLC | Hungary |
| Transocean Innovation Labs Ltd. | Bermuda |
| Transocean International Holdings Limited | Bermuda |
| Transocean International Limited | Bermuda |
| Transocean International Resources, Limited | Bermuda |
| Transocean Investments Holdings LLC | Delaware |
| Transocean Investments S.a r.l. | Luxembourg |
| Transocean Ltd. | Switzerland |
| Transocean Management Services GmbH | Switzerland |
| Transocean Minerals Holdings Limited | Bermuda |
| Transocean Norway Operations AS | Norway |
| Transocean Offshore (North Sea) Ltd. | Bermuda |
| Transocean Offshore Deepwater Drilling Inc. | Delaware |
| Transocean Offshore Deepwater Holdings Limited | Bermuda |
| Transocean Offshore Gulf of Guinea II Limited | Bermuda |
| Transocean Offshore Gulf of Guinea VII Limited | Bermuda |
| Transocean Offshore Gulf of Guinea XIII Limited | Bermuda |
| Transocean Offshore International Limited | Bermuda |
| Transocean Offshore International Ventures Limited | Bermuda |
| Transocean Offshore Limited | Delaware |
| Transocean Offshore PR Limited | Bermuda |
| Transocean Offshore USA Inc. | Delaware |
| Transocean Onshore Support Services Limited | Scotland |
| Transocean Pontus Limited | Bermuda |
| Transocean Poseidon Limited | Bermuda |
The list is long; these are the first 150 as the company lists them. From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from Transocean’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-23. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.