| Sunset Property Holdings Limited | Real estate | 2026 |
| Sunset Sanctuary Ltd | Other services | 2025 |
| Sunshield Unique Louvres Ltd | Construction | 2024 |
| Supat Ltd | Other services | 2017 |
| Superclub Industries Ltd | Arts & recreation | 2020 |
| Superfoods Explorer Ltd | Hospitality | 2024 |
| Superior Healthcare Ltd | Health & social care | 2014 |
| Superior Interior Renovations Limited | Construction | 2011 |
| Superlewing Ltd | Information & communication | 2020 |
| Supernova Spectaculars Ltd | Arts & recreation | 2024 |
| Supply Chain Partners Ltd | Professional & scientific | 2026 |
| Supply Logistics Ltd | Transport & logistics | 2025 |
| Support Network Ltd | Health & social care | 2002 |
| Supported (Education) Consultants Limited | Education | 2017 |
| Supported Accommodation Partnership (SAP) CIC | Professional & scientific | 2025 |
| Supporticus Ltd | Other services | 2016 |
| Supreme Dwellings Ltd | Real estate | 2021 |
| Supreme Screens Ltd | Wholesale & retail | 2013 |
| Supreme Selections Ltd | Wholesale & retail | 2024 |
| Suraiya Comunello Advisory Ltd | Professional & scientific | 2025 |
| Sureable Limited | Real estate | 2000 |
| Surefire Sprinklers Ltd | Construction | 2019 |
| Suri's Driveways Ltd | Administrative & support | 2023 |
| Surplus Supplies Redistribution CIC | Wholesale & retail | 2024 |
| Surreal Systems Limited | Information & communication | 1996 |
| Surtr Consulting Ltd | Professional & scientific | 2024 |
| Surventrics Ltd | Information & communication | 2026 |
| Susan Purdue Education Consultancy Limited | Education | 2019 |
| Suspendisse Ltd | Construction | 2019 |
| Sustainable Ideas Ltd | Professional & scientific | 2021 |
| Sustainable Sauces Limited | Manufacturing | 2025 |
| Sustainable Vehicle Sales Ltd | Wholesale & retail | 2025 |
| Sutherland 14 Homes Ltd | Real estate | 2024 |
| Sutherland 14 Ltd | Real estate | 2022 |
| Sutherland F2 Ltd | Real estate | 2025 |
| Sutherland Flat 1 Ltd | Real estate | 2025 |
| Sutton Grange AD Limited | Energy | 2012 |
| SV Batcup Limited | Information & communication | 2018 |
| SV Projects Solutions (UK) Ltd | Construction | 2017 |
| SV Sankalp IT Ltd | Information & communication | 2026 |
| SV Wholesale Ltd | Agriculture & fishing | 2022 |
| SV Wine Ltd | Wholesale & retail | 2019 |
| SVA Medical Ltd | Health & social care | 2026 |
| SVA Properties Ltd | Real estate | 2024 |
| Svantek UK Ltd | Professional & scientific | 2010 |
| Sved Ltd | Extraterritorial | 2023 |
| Sven Autos Ltd | Wholesale & retail | 2020 |
| Sven Saunas Limited | Manufacturing | 1996 |
| Svictor Courier Limited | Transport & logistics | 2017 |
| Svjr Property Ltd | Real estate | 2020 |
| SVS Trading Limited | Wholesale & retail | 2023 |
| SVZ Medicare Ltd | Health & social care | 2014 |
| SW & H Limited | Professional & scientific | 2022 |
| SW & H Property Limited | Professional & scientific | 2022 |
| SW Euro Trans Ltd | Transport & logistics | 2015 |
| SW Furniture Ltd | Manufacturing | 2014 |
| SW Independent Ltd | Health & social care | 2023 |
| SW Nominees Limited | Financial services | 2025 |
| Swabey Lane Management Company Limited | Households | 2018 |
| Swachter Limited | Health & social care | 2017 |
| Swagger Box Limited | Wholesale & retail | 2020 |
| Swain Building Services Limited | Construction | 2025 |
| Swain FH Ltd | Real estate | 2024 |
| Swais Home and Property Ltd | Hospitality | 2025 |
| Swan Knight Distillery Ltd | Wholesale & retail | 2022 |
| Swan PL Holdings Ltd | Real estate | 2017 |
| Swanford Editorial Services Limited | Professional & scientific | 2015 |
| Swaran Chatha Limited | Transport & logistics | 2021 |
| Swarme Limited | Administrative & support | 2016 |
| SWC Accountancy and Management Limited | Professional & scientific | 2026 |
| Sweatynursie Ltd | Health & social care | 2022 |
| Sweet & Spicey Limited | Hospitality | 2019 |
| Sweet Creations 24 Ltd | Hospitality | 2024 |
| Sweet DEM Sugar Ltd | Wholesale & retail | 2023 |
| Sweet Heat Services Limited | Construction | 2021 |
| Sweet Ones Music Ltd | Arts & recreation | 2024 |
| Sweet Orawan Ltd | Wholesale & retail | 2026 |
| Sweet Street Solutions Limited | Construction | 2025 |
| Swift Autos and Transport Ltd | Wholesale & retail | 2025 |
| Swift JAY Ltd | Professional & scientific | 2011 |
| Swift Property Solvers Ltd | Real estate | 2024 |
| Swift Replacement Hire Ltd | Administrative & support | 2019 |
| Swift Send Ltd | Transport & logistics | 2024 |
| Swiftfin Ltd | Financial services | 2022 |
| Swiftford Limited | Real estate | 1996 |
| Swiigg Limited | Information & communication | 2024 |
| Swim Camp International Limited | Arts & recreation | 2017 |
| SWN Properties Limited | Real estate | 2023 |
| SY Financial Consultants Limited | Administrative & support | 2013 |
| Sycal Limited | Professional & scientific | 1984 |
| Sycal Umbrellas Print & Promotions Limited | Wholesale & retail | 1983 |
| Sycamore Homes (Bedford) Limited | Construction | 1998 |
| Sycamore Nine Limited | Information & communication | 2022 |
| Sydney Hudson Ltd. | Professional & scientific | 2018 |
| Sygne Ltd | Manufacturing | 2025 |
| Sylda Healthcare Services Ltd | Health & social care | 2022 |
| Sylgrav Limited | Hospitality | 2009 |
| Sylhet House Ltd | Real estate | 2023 |
| Sylva-Lily Flowers Ltd | Other services | 2025 |
| Symbiocal Ltd | Professional & scientific | 2023 |