| Sussex Fitness Limited | Arts & recreation | 2023 |
| Sussex Garage Conversions Ltd | Construction | 2020 |
| Sussex Pharmacies Ltd | Wholesale & retail | 2019 |
| Sussex Properties Maintenance Limited | Real estate | 2022 |
| Sussex Vision International Limited | Manufacturing | 2003 |
| Sustainability Works Limited | Professional & scientific | 2001 |
| Sustainable Change With Purpose Limited | Professional & scientific | 2023 |
| Sustainable Transactions Ltd | Water & waste | 1993 |
| Sutcliffe House (London Road,Bath) Management Company Limited | Households | 2006 |
| Sutherland House Commercial LLP | | 2015 |
| Sutherland House Crawley LLP | | 2015 |
| Sutherland House Crawley Resi LLP | | 2019 |
| Sutri Nutrition and Wellbeing Ltd | Health & social care | 2020 |
| Sutsare Consultants Limited | Information & communication | 2012 |
| Sutton Aparthotel Ltd | Hospitality | 2015 |
| Sutton House (Penrose Park) Biggleswade Residents Company Limited | Households | 2014 |
| Sutton Place (Sutton Coldfield) Management Company Limited | Households | 2014 |
| Sutton Woods Management Company Limited | Households | 2009 |
| Suvai Ltd | Hospitality | 2025 |
| Suwanee (UK) Limited | Real estate | 2015 |
| SV Croydon Limited | Hospitality | 2013 |
| SV Gym Limited | Arts & recreation | 2022 |
| SV UK Services Limited | Health & social care | 2020 |
| Svap Shipping UK Ltd | Transport & logistics | 2025 |
| Svdr Ltd | Real estate | 2020 |
| Svecfix Ltd | Construction | 2024 |
| Svetlin & Viktor Decorating Ltd | Construction | 2020 |
| Svsdd Holdings Limited | Financial services | 2025 |
| SW Account Technician Ltd | Professional & scientific | 2014 |
| SW Haulage & Recycling Limited | Water & waste | 2025 |
| SW London Services Ltd | Wholesale & retail | 2021 |
| SW7RL Limited | Extraterritorial | 2019 |
| SW8 London Limited | Real estate | 2021 |
| SWA Foods Limited | Extraterritorial | 2013 |
| Swaad India Ltd | Manufacturing | 2024 |
| Swaf Limited | Real estate | 2006 |
| Swaffield Close (Ampthill) Residents Association Limited | Households | 2013 |
| Swaftech Limited | Extraterritorial | 2013 |
| Swag London Limited | Manufacturing | 2015 |
| Swallowfield House Management Co.Limited | Households | 1967 |
| Swallows Croft Management Limited | Real estate | 2001 |
| Swami Tiles and Bathrooms Merchants Limited | Wholesale & retail | 2025 |
| Swan Court (Pulborough) Management Ltd | Households | 2003 |
| Swanbrook House Management Limited | Households | 1990 |
| Swanson Plumbing and Heating Ltd | Construction | 2013 |
| Swanyard Lancaster Limited | Households | 1989 |
| Swap Cote Mews Management Company Limited | Households | 1989 |
| Swarn Investments Limited | Real estate | 2020 |
| Swarnakamal Ltd | Information & communication | 2025 |
| Swastik Limited | Wholesale & retail | 2022 |
| Swathee a Properties Ltd | Real estate | 2025 |
| Swavovski Ltd | Construction | 2012 |
| Swaylands House Remediation Project Limited | Construction | 2020 |
| SWD Business Link Ltd | Other services | 2012 |
| Sweeeeeetz Limited | Wholesale & retail | 2021 |
| Sweet After Meals Ltd | Hospitality | 2026 |
| Sweet Box Croydon Ltd | Wholesale & retail | 2018 |
| Sweet Dough Ltd | Wholesale & retail | 2025 |
| Sweet MUM Day Nursery Ltd | Health & social care | 2025 |
| Sweet Nightingale Productions Ltd | Arts & recreation | 2019 |
| Sweet Scoops Desserts Ltd | Hospitality | 2022 |
| Sweetbean Croydon Limited | Hospitality | 2017 |
| Sweetness Gracious ME Ltd | Wholesale & retail | 2022 |
| Sweetsop Bakery Ltd | Hospitality | 2025 |
| Swera International Ltd | Wholesale & retail | 2014 |
| Swift Booze Express Limited | Wholesale & retail | 2024 |
| Swift Global Services Ltd | Wholesale & retail | 2023 |
| Swift Global Ventures Ltd | Wholesale & retail | 2025 |
| Swift Software Solutions Ltd | Information & communication | 2025 |
| Swift Sweep Ltd | Wholesale & retail | 2022 |
| Swiftcore Group Limited | Professional & scientific | 2026 |
| Swiftfix London Ltd | Construction | 2024 |
| Swiftstorm Limited | Hospitality | 2006 |
| Swiss Bubble Ltd | Hospitality | 2020 |
| Swiss Fashion & Lifestyle (UK) Ltd | Manufacturing | 2024 |
| Switchboard Group Ltd | Financial services | 2022 |
| Switched on UK Limited | Construction | 1991 |
| Switherland Lodge Residents Management Company Limited | Households | 2021 |
| SWL Care Haven Ltd | Health & social care | 2023 |
| SWP Service Charge Accountants Limited | Professional & scientific | 2024 |
| Swwift Ltd. | Transport & logistics | 2012 |
| SYA Trades Ltd | Wholesale & retail | 2020 |
| Syaet Limited | Mining & quarrying | 2016 |
| Syberg Ltd | Administrative & support | 2016 |
| SYC Executive Protection Limited | Other services | 2014 |
| Sycamore Gardens II (Epsom) Management Company Limited | Real estate | 2018 |
| Sydney Court (Stretford) Management Company Limited | Households | 2003 |
| Sydney Lawn Management Company Limited | Households | 2014 |
| Sydney Place Freehold Management Limited | Real estate | 1998 |
| Syed Hasnain Raza Ltd | Wholesale & retail | 2024 |
| Syed Motors Ltd | Wholesale & retail | 2024 |
| Syeda Decor Services Ltd | Other services | 2026 |
| Sylvan Place Management Company Limited | Households | 1999 |
| Sylvia Trading Ltd | Wholesale & retail | 2024 |
| Symbiosis Group Limited | Real estate | 2025 |
| Symtech Limited | Professional & scientific | 2025 |
| Symvision Ltd | Information & communication | 2019 |
| Synapsenergy Ltd | Professional & scientific | 2023 |
| Syncratic AI Ltd | Professional & scientific | 2023 |
| Syndek Ltd | Wholesale & retail | 2025 |