| Sparkle Consulting Limited | Administrative & support | 2002 |
| Sparkle Flower (Holdings) Limited | Financial services | 2024 |
| Sparklife Marketing Ltd | Professional & scientific | 2023 |
| Sparkling Creativity Ltd | Professional & scientific | 2024 |
| Sparrow Bidco Limited | Financial services | 2025 |
| Sparrow Topco Limited | Financial services | 2025 |
| Speak OUT Speech Therapy Ltd | Health & social care | 2022 |
| Specialist Dental London Limited | Health & social care | 2026 |
| Specifix Consulting Ltd | Information & communication | 2008 |
| Specimen Cave Ltd | Wholesale & retail | 2024 |
| Spectrum Care Limited | Health & social care | 2002 |
| Spectrum Recordings Ltd | Information & communication | 2020 |
| Spenser Consulting Ltd | Information & communication | 2016 |
| Sphere International Limited | Professional & scientific | 1996 |
| SPI-7 Ltd | Professional & scientific | 2015 |
| Splash Global UK | Other services | 2026 |
| Sponge Cleaning Ltd | Administrative & support | 2025 |
| Spore Agency Ltd | Professional & scientific | 2025 |
| Sportac 76 Limited | Arts & recreation | 1997 |
| Sports Fusion Limited | Information & communication | 1998 |
| Sportsforce International Limited | Administrative & support | 1990 |
| Spring Building Consultancy Limited | Professional & scientific | 2012 |
| Spring Literary Ltd | Administrative & support | 2022 |
| Springfield Road Management (NO.8) RTM Company Limited | Households | 2006 |
| Springhill O&A Properties Limited | Real estate | 2026 |
| Sprp (1) Ltd | Construction | 2018 |
| Sprp Limited | Construction | 2017 |
| Sputnik Music Ltd | Information & communication | 2012 |
| Spytree Studios Limited | Administrative & support | 2014 |
| Squirky Music Library Ltd | Information & communication | 2013 |
| Squirky Music Ltd | Information & communication | 2001 |
| Squirrel Tail Limited | Real estate | 2014 |
| SR1011 Ltd | Real estate | 2025 |
| SR1012 Ltd | Real estate | 2025 |
| SR1013 Ltd | Real estate | 2025 |
| SR1014 Ltd | Real estate | 2025 |
| SR1015 Ltd | Real estate | 2025 |
| SR16 Management Limited | Households | 2021 |
| Srishti - Nina Rajarani Dance Creations | Education | 2008 |
| Srishti Yuva Culture | Arts & recreation | 2006 |
| Srjb Legalfield Ltd | Professional & scientific | 2024 |
| Srota Advisory Ltd | Professional & scientific | 2024 |
| Srve Ltd | Wholesale & retail | 2025 |
| SS Elite Ltd | Real estate | 2025 |
| SS Management Ltd | Households | 2025 |
| SS Sunshine Properties Ltd | Real estate | 2024 |
| SSA United Ltd | Real estate | 2022 |
| SSN Investments Limited | Real estate | 2021 |
| SSQ Property Holdings Limited | Real estate | 2026 |
| ST Burnham Ltd | Real estate | 2024 |
| ST Charles Homes Ltd | Real estate | 2009 |
| ST Cosmeticare Ltd | Extraterritorial | 2023 |
| ST James Park (Long Ditton) Estate Company Limited | Households | 1998 |
| ST James Park (Long Ditton) Residents Company Limited | Households | 1998 |
| ST Johns Mews (Hampton Wick) Ltd | Administrative & support | 2002 |
| ST Leonards House Ltd | Real estate | 2018 |
| ST Leonards House RE Limited | Real estate | 2026 |
| ST Marys 106 Limited | Real estate | 2026 |
| ST Marys Manarcad Limited | Health & social care | 2018 |
| ST Philips Gate Management Company Limited | Households | 1999 |
| ST Saviours Wharf Co. Limited | Real estate | 2008 |
| ST. Andrew's Court (New Malden) NO. 2 Residents Company Limited | Households | 1997 |
| ST. Georges Day Nursery (Hanworth Park) Limited | Education | 2003 |
| ST. Mary's (NO. 1) (Weybridge) Residents Association Limited | Households | 1968 |
| STA Developments Limited | Other services | 2014 |
| Stack & Bonner (Lettings) Limited | Real estate | 1999 |
| Stack Computing Limited | Professional & scientific | 2012 |
| Stafford House (Whitelands) Management Limited | Households | 2006 |
| Staged Payments Limited | Professional & scientific | 2020 |
| Stal Roofing Ltd | Construction | 2026 |
| Stanalyse Ltd | Information & communication | 2026 |
| Standby Television & New Media Limited | Other services | 2008 |
| Staniford Associates Limited | Professional & scientific | 2018 |
| Stanley House Management Limited | Households | 1994 |
| Stanton Marris Limited | Professional & scientific | 2013 |
| Stapeley's Engineering Ltd | Professional & scientific | 2019 |
| Star Chain Sourcing Limited | Wholesale & retail | 2022 |
| Star Shopfront &Windows Ltd | Administrative & support | 2018 |
| Starbarks Ltd | Wholesale & retail | 2023 |
| Stare Decisis Ltd | Professional & scientific | 2018 |
| Starkmann Books Limited | Wholesale & retail | 2013 |
| Starkmann Limited | Wholesale & retail | 1974 |
| Starlight Europe Ltd | Wholesale & retail | 2010 |
| Start Logistics Ltd | Transport & logistics | 2018 |
| Static Autos Limited | Wholesale & retail | 2022 |
| Statim Consulting Limited | Professional & scientific | 2003 |
| Station Approach (Epsom) Management Company Limited | Households | 2006 |
| Station Road Hampton Wick Ltd | Households | 2014 |
| Staywell Estates Ltd | Real estate | 2025 |
| Staywood Limited | Health & social care | 2002 |
| STDL100D Ltd | Information & communication | 2015 |
| Steadi-Mike Limited | Information & communication | 2023 |
| Steadtree Finance & Properties Ltd | Financial services | 2014 |
| Steadtree Investments Ltd | Real estate | 2017 |
| Steampunk Consulting Ltd | Professional & scientific | 2020 |
| Stefano Prestige Trade Ltd | Wholesale & retail | 2025 |
| Steinert Investments Ltd | Real estate | 2021 |
| Stellar&Co Ltd | Extraterritorial | 2025 |
| Step UP Property Solutions Ltd | Real estate | 2021 |
| Stephanie Marques Ltd | Information & communication | 2019 |