| 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 Driller Ltd | Bermuda | Owner of Sevan Driller | ||||||
| Sevan Louisiana Hungary KFT | Hungary | Owner of Sevan Louisiana | ||||||
| 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 Gemini Ltd | Bermuda | Owner of West Gemini | ||||||
| Seadrill Jupiter Ltd. | Bermuda | Owner of West Jupiter | ||||||
| Seadrill Indonesia Ltd | Bermuda | Owner of West Leda | ||||||
| Seadrill Neptune Hungary KFT | Bermuda | Owner of West Neptune | ||||||
| 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 | ||||||
| Contracting and management companies | ||||||||
| Eastern Drilling AS | Norway | Onshore Services | ||||||
| Seadrill UK Operations Ltd | United Kingdom | Rig Operator | ||||||
| Seadrill Management Ltd | United Kingdom | Onshore Services | ||||||
| Seadrill Insurance Ltd | Bermuda | Onshore services | ||||||
| Seadrill Angola Lda | Angola | Onshore Services | ||||||
| Seadrill Gulf Operations Neptune LLC | USA | Rig Operator | ||||||
| Seadrill Treasury UK Ltd | United Kingdom | 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 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 | ||||||
| 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 Investment Holding Company 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 Sevan Holdings Ltd | Bermuda | Holding Company | ||||||
| Seadrill Seabras SP 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 | ||||||