Exhibit 21
SUBSIDIARIES OF TRANSOCEAN LTD.
(as of December 31, 2025)
Name | Jurisdiction |
|---|---|
15375 Memorial Corporation | Delaware |
Aguas Profundas, Limitada | Angola |
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 |
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Exhibit 21
Name | Jurisdiction |
|---|---|
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 |
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Exhibit 21
Name | Jurisdiction |
|---|---|
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 |
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Exhibit 21
Name | Jurisdiction |
|---|---|
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 |
Transocean Poseidon Opco, Inc. | Delaware |
Transocean Proteus Limited | Bermuda |
Transocean Proteus Opco LLC | Delaware |
Transocean Quantum Management Limited | Bermuda |
Transocean Rig 140 Limited | Bermuda |
Transocean Sedco Forex Ventures Limited | Bermuda |
Transocean Sentry Limited | Bermuda |
Transocean Services (India) Private Limited | India |
Transocean Services AS | Norway |
Transocean Skyros Limited | Bermuda |
Transocean Spitsbergen ASA | Norway |
Transocean SPSF Holdings Limited | Bermuda |
Transocean Sub Asset Holdings 1 Limited | Bermuda |
Transocean Sub Asset Holdings 2 Limited | Bermuda |
Transocean Sub Asset Holdings 3 Limited | Bermuda |
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Exhibit 21
Name | Jurisdiction |
|---|---|
Transocean Support Services Limited | Bermuda |
Transocean Support Services Nigeria Limited | Nigeria |
Transocean Support Services Private Limited | India |
Transocean Technical Services Egypt LLC | Egypt |
Transocean Titan Financing Limited | Bermuda |
Transocean U.S. Holdings LLC | Delaware |
Transocean UK Limited | England & Wales |
Transocean Voyager 1 Limited | Bermuda |
Transocean Worldwide Limited | Bermuda |
Triton Aquila GmbH | Switzerland |
Triton Atlas GmbH | Switzerland |
Triton Capital I GmbH | Switzerland |
Triton Capital II GmbH | Switzerland |
Triton Capital Mexico GmbH | Switzerland |
Triton Corcovado LLC | Hungary |
Triton Financing LLC | Hungary |
Triton Gemini GmbH | Switzerland |
Triton Holdings Limited | Bermuda |
Triton Hungary Asset Management LLC | Hungary |
Triton Hungary Investments 1 Limited Liability Company | Hungary |
Triton Industries Limited | Bermuda |
Triton KG2 GmbH | Switzerland |
Triton Management Services LLC | Hungary |
Triton Mykonos LLC | Hungary |
Triton Nautilus Asset Leasing GmbH | Switzerland |
Triton Nautilus Asset Management LLC | Hungary |
Triton Poseidon GmbH | Switzerland |
Triton Quantum I GmbH | Switzerland |
Triton Quantum II GmbH | Switzerland |
Triton Quantum Rig Holdings GmbH | Switzerland |
Triton Titan GmbH | Switzerland |
Triton Voyager Asset Leasing GmbH | Switzerland |
TRM Holdings Limited | Bermuda |
TSSA - Servicos de Apoio, Lda. | Angola |
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