EX-8.1 6 exhibit812020.htm EX-8.1
Exhibit 8.1
SIGNIFICANT SUBSIDIARIES
The table below lists the Company's significant subsidiaries as of December 31, 2020:

Name of company | Country of Incorporation | Principal activities |
Drilling unit owning companies |  |  |
Asia Offshore Rig 1 Ltd | Bermuda | Owner of AOD 1 |
Asia Offshore Rig 2 Ltd | Bermuda | Owner of AOD 2 |
Asia Offshore Rig 3 Ltd | Bermuda | Owner of AOD 3 |
Sevan Brasil Ltd | Bermuda | Owner of Sevan Brasil |
Sevan Drilling Rig VI Pte Ltd | Singapore | Owner of Sevan Developer |
Sevan Driller Ltd | Bermuda | Owner of Sevan Driller |
Sevan Louisiana Hungary KFT | Hungary | Owner of Sevan Louisiana |
North Atlantic Alpha Ltd | Bermuda | Owner of West Alpha |
Seadrill Ariel Ltd. | Liberia | Owner of West Ariel |
Seadrill Callisto Ltd | Bermuda | Owner of West Callisto |
Seadrill Carina Ltd | Bermuda | Owner of West Carina |
Seadrill Castor Pte Ltd | Bermuda | Owner of West Castor |
Seadrill Cressida Ltd | Bermuda | Owner of West Cressida |
Seadrill Eclipse Ltd | Bermuda | Owner of West Eclipse |
Seadrill Elara Ltd | Bermuda | Owner of West Elara |
Seadrill Eminence Ltd | Bermuda | Owner of West Eminence |
Seadrill Freedom Ltd | Bermuda | Owner of West Freedom |
Seadrill Gemini Ltd | Bermuda | Owner of West Gemini |
Seadrill Jupiter Ltd. | Bermuda | Owner of West Jupiter |
Seadrill Indonesia Ltd | Bermuda | Owner of West Leda |
North Atlantic Navigator Ltd | Bermuda | Owner of West Navigator |
Seadrill Neptune Hungary KFT | Bermuda | Owner of West Neptune |
Seadrill Orion Ltd | Bermuda | Owner of West Orion |
Seadrill Pegasus Pte Ltd | Singapore | Owner of West Pegasus |
North Atlantic Phoenix Ltd | Bermuda | Owner of West Phoenix |
Seadrill Prospero Ltd | Bermuda | Owner of the West Prospero |
Seadrill Saturn Ltd | Bermuda | Owner of West Saturn |
Seadrill Telesto Ltd | Bermuda | Owner of West Telesto |
Seadrill Tellus Ltd | Bermuda | Owner of West Tellus |
Seadrill Tucana Ltd | Bermuda | Owner of West Tucana |
North Atlantic Venture Ltd | Bermuda | Owner of West Venture |
Scorpion Vigilant Ltd | Bermuda | Owner of West Vigilant |
Contracting and management companies |  |  |
Seadrill Offshore AS - Europe operations | Norway | Finance Lessee |
Eastern Drilling AS | Norway | Onshore Services |
Seadrill UK Operations Ltd | United Kingdom | Rig Operator |
Seadrill Management Ltd | United Kingdom | Onshore Services |
Seadrill Deepwater Charterer Ltd | Bermuda | Finance Lessee |
Seadrill Insurance Ltd | Bermuda | Onshore services |
Seadrill Angola Lda | Angola | Onshore Services |
Seadrill Gulf Operations Neptune LLC | USA | Rig Operator |
Seadrill SeaMex SC Holdco Ltd | Bermuda | Onshore Finance |
Seadrill Treasury UK Ltd | United Kingdom | Onshore Finance |
Seadrill SeaMex 2 de Mexico S de RL de CV | Mexico | Onshore Finance |

Seadrill International Resourcing DMCC | UAE | Onshore Services |
Seadrill Global Services Ltd | Bermuda | Onshore Services |
Seadrill Management (S) Pte Ltd | Singapore | Onshore Services |
Seadrill Nigeria Operations Ltd | Nigeria | Onshore Services |
Seadrill Deepwater Units Pte Ltd | Singapore | Onshore Services |
Seadrill (Dalian) Consulting Co Ltd | China | Onshore Services |
Seadrill Americas INC | USA | Onshore Services |
Seadrill Serviços de Petróleo Ltda | Brasil | Rig Operator |
Seadrill Operations de Mexico S. de R.L. de C.V | Mexico | Onshore Services |
Seadrill Offshore Malaysia Sdn Bhd | Malaysia | Rig Operator |
Seadrill Labuan Ltd | Labuan | Intra-charterer |
Seadrill Newfoundland Operations Ltd | Canada | Onshore Services |
Seadrill UK Support Services Ltd | United Kingdom | Onshore Services |
North Atlantic Linus Charterer Ltd | Bermuda | Finance Lessee |
Seadrill Norway Crew AS | Norway | Onshore Services |
Seadrill North Sea Crewing Ltd | Bermuda | Onshore Services |
Seadrill Europe Management AS | Norway | Onshore Services |
Sevan Drilling North America LLC | USA | Rig Operator |
Seadrill Jack-ups Contracting Ltd | Suriname | Rig Operator |
Holding Companies |  |  |
Seadrill North Atlantic Holdings Ltd | Bermuda | Holding Company |
Seadrill Common Holdings Ltd | Bermuda | Holding Company |
Seadrill Deepwater Holdings Ltd | Bermuda | Holding Company |
Seadrill Jack Up Holding Ltd | Bermuda | Holding Company |
Seadrill Member LLC | Marshall Islands | Holding Company |
Seadrill Investment Holding Company Ltd | Bermuda | Holding Company |
Seadrill New Finance Ltd | Bermuda | Holding Company |
Seadrill Norway Operations Ltd | Bermuda | Holding Company |
Seadrill Rig Holding Company Ltd | Bermuda | Holding Company |
Seadrill Ltd | Bermuda | Holding Company |
Seadrill UK Ltd | United Kingdom | Holding Company |
Seadrill Partners LLC Holdco Ltd | Bermuda | Holding Company |
Seadrill Seabras UK Ltd | United Kingdom | Holding Company |
Seadrill Sevan Holdings Ltd | Bermuda | Holding Company |
Seadrill Seabras SP UK Ltd | United Kingdom | Holding Company |
Seadrill Mobile Units UK Ltd | United Kingdom | Holding Company |
Seadrill Seadragon UK Ltd | United Kingdom | Holding Company |
Seadrill Holdings Singapore Pte Ltd | Singapore | Holding Company |
Asia Offshore Drilling Ltd | Bermuda | Holding Company |
Scorpion Deepwater Ltd | Bermuda | Holding Company |
Scorpion International Ltd | Bermuda | Holding Company |
Seadrill GCC Operations Ltd | Bermuda | Holding Company |
Scorpion Drilling Ltd | Bermuda | Holding Company |
Seadrill Far East Ltd | Hong Kong | Holding Company |
Sevan Investimentos do Brasil Ltda | Brasil | Holding Company |
Sevan Drilling Rig IX Pte Ltd | Singapore | Holding Company |
Sevan Drilling Rig VI AS | Norway | Holding Company |
Seabras Serviços de Petróleo S.A. | Brasil | Holding Company |
Seabras Holdings GmbH | Austria | Holding Company |
Seabras Rig Holdings GmbH | Austria | Holding Company |