| SS Management Consulting Services Ltd | Professional & scientific | 2013 |
| Ssangeul Ltd | Wholesale & retail | 2025 |
| Ssit Capital Limited | Real estate | 2023 |
| SSK (London) Limited | Wholesale & retail | 2019 |
| Ssoei Ltd | Information & communication | 2025 |
| ST Andrews Yard Ltd | Construction | 2018 |
| ST Bernards Residents Company Limited | Households | 1999 |
| ST Clair Drive Limited | Real estate | 2025 |
| ST James Park Mews Residents Management Company Limited | Households | 2011 |
| ST James's Place Management Company Limited | Administrative & support | 1994 |
| ST Louis Court Management Company Limited | Households | 2005 |
| ST Marks Court (Surbiton) Residents Management Company Ltd | Households | 2012 |
| ST Mary's Court Residents Company Limited | Households | 1993 |
| ST. Andrews Square (40) Limited | Households | 2005 |
| ST. Bernard's House (Surbiton) Limited | Households | 1966 |
| Stagecraft International Limited | Arts & recreation | 2019 |
| Stakeholderz Limited | Extraterritorial | 2024 |
| Stallion Consultancy Limited | Information & communication | 2022 |
| Stallion Corporation Limited | Financial services | 2022 |
| Stallion Jeans Limited | Wholesale & retail | 2019 |
| Stand Back Productions Limited | Information & communication | 2023 |
| Standaway Ltd | Health & social care | 2020 |
| Stanhill Hotel Limited | Hospitality | 2025 |
| Stanislav SGG Ltd | Transport & logistics | 2018 |
| Stanley Road DRY Cleaners Ltd | Other services | 2023 |
| Stanton House Residents Association Limited | Households | 1981 |
| Stapor Estates Limited | Real estate | 2017 |
| Stapor Property Management Limited | Households | 2017 |
| Star of Molesey Ltd | Hospitality | 2021 |
| Star Vintage Jewellery Ltd | Other services | 2023 |
| Star Wardrobe Limited | Wholesale & retail | 2025 |
| Stark Creative Limited | Professional & scientific | 2011 |
| Stark Services Ltd | Professional & scientific | 2025 |
| Starlings Consultancy Limited | Real estate | 2020 |
| Starmai Invest Ltd | Real estate | 2025 |
| Starmai Ltd | Wholesale & retail | 2015 |
| Stars Fortune Limited | Hospitality | 2014 |
| State Change Ltd | Information & communication | 2025 |
| Station Property Management Ltd | Real estate | 2022 |
| Statushigh Limited | Administrative & support | 1990 |
| Stave Strategy & Design Ltd | Professional & scientific | 2026 |
| Stay and Away Ltd | Real estate | 2019 |
| Stedham House Ltd | Health & social care | 2011 |
| Steel Alloys Ltd | Wholesale & retail | 2024 |
| Stef Holding Ltd | Construction | 2021 |
| Stefan Craciun Limited | Wholesale & retail | 2018 |
| Stefan Mitchell Lighting Ltd | Information & communication | 2019 |
| Stephen Dalton & Co Limited | Real estate | 2009 |
| Stepping Stone Property Investments Ltd | Real estate | 2024 |
| Steren Consulting Limited | Professional & scientific | 2025 |
| Steriwave (Hungary) Ltd | Professional & scientific | 2009 |
| Steriwave Ltd | Professional & scientific | 2005 |
| Sterling Grace Homecare Ltd | Health & social care | 2026 |
| Sterling UK Homes Ltd | Real estate | 2020 |
| Stern Lion Ltd | Hospitality | 2013 |
| Stevdel Investments Ltd | Construction | 2021 |
| Steven Hughes Waste Management Ltd | Water & waste | 2012 |
| Stockwing Consulting Ltd | Arts & recreation | 2022 |
| Stoilov Limited | Professional & scientific | 2025 |
| Stonebridge International Services Ltd | Administrative & support | 2017 |
| Stonebridge Support Ltd | Wholesale & retail | 2024 |
| Stonegate Brickwork & Scaffolding Ltd | Construction | 2023 |
| Storage in Surbiton Limited | Administrative & support | 2012 |
| Storm Agency Ltd | Administrative & support | 2016 |
| Storm Global Holdings Ltd | Administrative & support | 2016 |
| Storm Global Ltd | Administrative & support | 2009 |
| Storm People Ltd | Administrative & support | 2020 |
| Storybox Marketing Ltd | Professional & scientific | 2025 |
| Stradlings Ltd | Wholesale & retail | 2021 |
| Stratarch Systems Ltd | Information & communication | 2025 |
| Stratinis Limited | Information & communication | 2006 |
| STRATUM42 Ltd | Professional & scientific | 2021 |
| Street Behaviour Surveys Ltd | Professional & scientific | 2021 |
| Street Space Designs Limited | Professional & scientific | 2020 |
| Strong 2020 Ltd | Transport & logistics | 2020 |
| Strong Management Services Limited | Professional & scientific | 1990 |
| Structural and Building Restorations Ltd | Construction | 2025 |
| Studio Casa Ltd | Professional & scientific | 2023 |
| Studio DEM Ltd | Professional & scientific | 2026 |
| Studio DT Ltd | Professional & scientific | 2019 |
| Studio Hopp Ltd | Professional & scientific | 2017 |
| Studio Nicholas Ltd | Information & communication | 2023 |
| Studio SIX Hairdressing Ltd | Other services | 2025 |
| Studio Witt Advanced Aesthetics Ltd | Other services | 2024 |
| Suave Consultants Limited | Information & communication | 2015 |
| Subbros Consulting Limited | Professional & scientific | 2025 |
| Subsonic Equilibrium Ltd | Wholesale & retail | 2025 |
| Sucklings Bakery Limited | Hospitality | 2017 |
| SUE Beer Consultants Limited | Health & social care | 1997 |
| Sullivan’S Craft Brewery (1702) UK Limited | Wholesale & retail | 2022 |
| Summerfield Lane Residents Limited | Households | 2015 |
| Summit Learning Ltd | Professional & scientific | 2025 |
| Sumone Limited | Other services | 2021 |
| Sun Hotel Limited | Hospitality | 2004 |
| Sun Light EU Trading Ltd | Wholesale & retail | 2018 |
| Sun TV UK Limited | Hospitality | 2003 |
| Suna Supplies Limited | Manufacturing | 1987 |
| Sunflower Creations Ltd | Information & communication | 2017 |
| Sunny Health Ltd | Wholesale & retail | 2024 |
| Sunnylease Property Management Limited | Households | 2000 |