| Sellex UK Limited | London | 2025 |
| Seloch Energy Ltd | Aberdeen | 2019 |
| Seltrust Associates Limited | London | 1986 |
| Semacol Enterprises Limited | Cardiff | 2011 |
| Sempil Capital Limited | Bicester | 2026 |
| Senergy OIL & GAS Limited | Westhill | 2008 |
| Senergy Wells Limited | Westhill | 2002 |
| Senlim Oilfield Logistics Limited | Liverpool | 2018 |
| Sentinel Offshore Vessels 2 Limited | Aberdeen | 2013 |
| Sentinel Offshore Vessels 54 Limited | Aberdeen | 2015 |
| Sentinel Offshore Vessels Limited | Aberdeen | 2013 |
| Sentinel Subsea (Middle East) Limited | Elgin | 2025 |
| Sentinel Subsea Ltd | Elgin | 2018 |
| Seplat Energy UK Limited | London | 2013 |
| Serabi Gold Nominee Limited | London | 2019 |
| Serabi Gold PLC | | 2004 |
| Serafim Ltd. | Aberdeen | 2000 |
| Seremaci Ltd | Rochdale | 2022 |
| Serica Energy (UK) Limited | London | 2000 |
| Serica Energy Chinook Limited | Aberdeen | 2007 |
| Serica Energy Gead & Catcher Limited | London | 2025 |
| Serica Energy Meltemi Limited | London | 2011 |
| Serica Energy Mistral Limited | London | 2002 |
| Serica Energy Norte Limited | Aberdeen | 2011 |
| Serica Energy PLC | London | 2005 |
| Serica GBA Limited | London | 2023 |
| Serica Holdings UK Limited | London | 1984 |
| Serica UK Exploration Limited | London | 2012 |
| Serinus Petroleum Consultants Limited | London | 2016 |
| Serlby Quarry Limited | Doncaster | 2007 |
| Servatec Holdings Limited | Newark | 2020 |
| Servtec Limited | Lockerbie | 2002 |
| SET Drilling Company Limited | Portlethen | 1996 |
| Seth Hill & SON Limited | Pontyclun | 1952 |
| Seven Seas Auto Limited | Windsor | 2021 |
| Seven Seven Resource Advisors Limited | Covent Garden | 2017 |
| Several Solutions Ltd | Broughty Ferry | 2026 |
| Severn Crushing Limited | Liverpool | 2018 |
| Severn Sands Limited | Derby | 1982 |
| Sewa Coti Ltd. | Henfield | 2014 |
| Sewells Reservoir Construction Limited | Colchester | 1989 |
| SF Rope Access Services Ltd | Hartlepool | 2021 |
| SGB Services Limited | Great Yarmouth | 2015 |
| SGC Inspection Ltd | Dumbarton | 2022 |
| SGH Investments Limited | Tetbury | 2014 |
| SGR Energy Services Limited | Buckie | 2023 |
| SGS GAS Analysis Services Scotland Limited | Aberdeen | 2016 |
| SGW OIL and GAS Limited | Peterhead | 2019 |
| SGZ Cononish Limited | Aberdeen | 2017 |
| SGZ Grampian Limited | Aberdeen | 2006 |
| SH Plant (Chesterfield) Limited | Chesterfield | 2008 |
| Shaba Metals UK Limited | London | 2026 |
| Shadwell Park Estates Ltd | Shifnal | 2019 |
| Shaftesbury Stone Ltd | Sturminster Newton | 2019 |
| Shalco Energy Limited | London | 2011 |
| Shane Bibby Training Services Limited | Arbroath | 2010 |
| Shanlieve Stone Ltd | Newry | 1997 |
| Shar International Ltd | Harrow | 2025 |
| Shaughan Quarries Limited | Newry | 1996 |
| Shaun.C.Petrie Ltd | Buckie | 2022 |
| Shaw Pipeline Services UK Limited | Great Yarmouth | 2022 |
| Sheed Services Ltd | Dundee | 2006 |
| Sheikh Sons Limited | Horsham | 2025 |
| Shelf Drilling (UK), Ltd. | Dyce, Aberdeen | 2022 |
| Shell China Exploration and Production Company Limited | | 1974 |
| Shell Clair UK Limited | London | 2009 |
| Shell EP Offshore Ventures Limited | | 1982 |
| Shell Exploration and Production Limited | London | 1999 |
| Shell Global LNG Limited | London | 1976 |
| Shell South Asia LNG Limited | London | 2014 |
| Shell Trinidad 5(A) Limited | London | 2005 |
| Shell Trinidad and Tobago Limited | London | 1989 |
| Shell Trinidad Block 22 Limited | London | 1994 |
| Shell Trinidad Block E Limited | London | 2014 |
| Shell Trinidad Ncma 4 Limited | London | 2025 |
| Shell Tunisia Upstream Limited | London | 1992 |
| Shell U.K. Limited | | 1915 |
| Shell U.K. North Atlantic Limited | | 2003 |
| Shell Upstream Overseas Services (I) Limited | London | 2011 |
| Shellchildxshell Limited | Beckton | 2017 |
| Shelterstone Petroleum Limited | West Malling | 2017 |
| Shen Marine Ltd | Westhill | 2024 |
| Shengzhidao (UK) Biotechnology Co., Ltd | Beckenham | 2024 |
| Shenko Inspection Services Ltd | Blackpool | 2018 |
| Shepherd Hill Petroleum Development Ltd. | Dartford | 2015 |
| Sherborne Stone Limited | Sherborne | 2002 |
| Sherrard (Bros) Sand & Gravel Ltd | Limavady | 2005 |
| Shields & Sons International Ltd | Ashford | 2019 |
| Shijiazhuang Runfeng Ltd | Gillingham | 2022 |
| Shikra Global Ltd | High Wycombe | 2025 |
| Shimmeringrays Int'L Limited | London | 2025 |
| Shimu (UK) Crop Nutrition Co., Limited | Cambridge | 2026 |
| Shinestone State Capital Ltd | London | 2025 |
| Ship-Inspect Ltd | Blackburn | 2009 |
| Shipton Limited | Marlborough | 2011 |
| Shipwreck Industries Ltd | Northolt | 2026 |
| Shire Aggregates Bulk Limited | Middlesbrough | 2003 |
| Shire Hill Quarries (Operations) Ltd | Stockport | 2020 |
| Shire Oak Quarries Limited | Gloucester | 2014 |
| Shires Developments (Engine) Limited | Rushyford | 2007 |