| Sports Media Africa Limited | Information & communication | 2022 |
| Spotless Homes Ltd | Real estate | 2025 |
| Spotlight Healthcare Properties Ltd | Real estate | 2020 |
| Spotlight Healthcare Services Limited | Administrative & support | 2014 |
| Sppc UK Limited | Professional & scientific | 2016 |
| Sprightly Global Staffing Limited | Administrative & support | 2019 |
| SPS Support Ltd | Real estate | 2022 |
| SPT Fitness Limited | Arts & recreation | 2013 |
| Spud on Sea Ltd | Hospitality | 2025 |
| Sqube Properties & Investments Ltd | Real estate | 2021 |
| Squeegee Board Limited | Professional & scientific | 2025 |
| Squidworx Studio Ltd | Manufacturing | 2025 |
| Srav Ltd | Education | 2025 |
| SS9 Beauty Ltd | Other services | 2020 |
| Sscap Ltd | Wholesale & retail | 2024 |
| Ssdcalibration Ltd | Manufacturing | 2021 |
| Ssshc Limited | Health & social care | 2023 |
| ST Bernard's High School | Education | 2011 |
| ST John's SW Ltd | Real estate | 2025 |
| ST Johns of Enfield Limited | Real estate | 2008 |
| Stacnnom Properties Limited | Real estate | 2020 |
| Stanley's Plumbing & Heating Limited | Construction | 2022 |
| Staple Tree LLP | | 2015 |
| Star Cabin Services Ltd | Administrative & support | 2025 |
| Star Gleam Education Essex Ltd | Education | 2025 |
| Starlian Limited | Hospitality | 2020 |
| Starlight Villas Ltd | Real estate | 2024 |
| Stelladam Ltd | Financial services | 2024 |
| Step Ahead Physiotherapy Ltd | Health & social care | 2019 |
| Stephen Joslin Ltd | Professional & scientific | 2002 |
| Stevens Security Solutions Ltd | Administrative & support | 2025 |
| Stockwood Valley Limited | Hospitality | 2026 |
| Storm & Galanz (UK) Limited | Wholesale & retail | 2006 |
| Storm Angel Properties Limited | Real estate | 2016 |
| Storm Business I.T. Limited | Information & communication | 2019 |
| Storm Commerce Ltd | Wholesale & retail | 2021 |
| Stormtech AI Limited | Information & communication | 2026 |
| Story Nest Collective CIC | Education | 2026 |
| Stratabay Limited | Hospitality | 2020 |
| Stratton-Heathfield House Residents Association Limited | Households | 1985 |
| Stubbington Creek Limited | Hospitality | 2026 |
| Studio Project Limited | Professional & scientific | 2018 |
| Stylean Ltd | Administrative & support | 2020 |
| Subflow Forecast Ltd | Professional & scientific | 2026 |
| Sun Lane Ltd | Administrative & support | 2000 |
| Sunniesky Limited | Hospitality | 2021 |
| Sunny Kitchen Limited | Hospitality | 2026 |
| Sunrise Finance Limited | Professional & scientific | 2019 |
| Super Healthcare Ltd | Administrative & support | 2017 |
| Super Prime Home Management Limited | Construction | 2020 |
| Superb Cleaning Services Ltd | Administrative & support | 2025 |
| Supermaple Limited | Hospitality | 2020 |
| Supplimart Ltd | Wholesale & retail | 2025 |
| Surabhi Property Limited | Real estate | 2021 |
| Surespeech Ltd | Education | 2012 |
| Surin Thai Limited | Hospitality | 2021 |
| Sutherland Risk International Limited | Administrative & support | 2016 |
| Suvai Eats Ltd | Hospitality | 2022 |
| SVS Investments PVT Ltd | Real estate | 2025 |
| Sweet Crush Limited | Hospitality | 2020 |
| SWF Management Co Ltd | Real estate | 2005 |
| Swinborne Management Limited | Real estate | 1997 |
| Swinton Limited | Administrative & support | 2007 |
| Swish Property Services Ltd | Other services | 2019 |
| Switch Bars Ltd | Hospitality | 2022 |
| SXP Group Ltd | Financial services | 2025 |
| Sytang Management Limited | Real estate | 2026 |
| T.A.M World Limited | Other services | 2014 |
| T.I.J Builders Ltd | Construction | 2025 |
| T.M. Shokai Limited | Hospitality | 1995 |
| T.M.E Permanent Way Services Ltd | Construction | 2023 |
| T.X. Services Limited | Information & communication | 2001 |
| Taaz London Ltd | Hospitality | 2024 |
| Taberer Plumbing Limited | Construction | 2023 |
| Tac-Com (UK) Ltd | Information & communication | 2021 |
| Tahnas Ltd | Wholesale & retail | 2025 |
| Talah JAW Ltd | Wholesale & retail | 2025 |
| Talkwave Ltd | Wholesale & retail | 2025 |
| Tamil Eelam | Education | 2016 |
| Tamili | Information & communication | 2023 |
| TAN & Family Property Limited | Real estate | 2025 |
| Tanman Consultants Ltd | Health & social care | 2014 |
| Tarayp Tuemond Ltd | Wholesale & retail | 2023 |
| Tarzandthecity Ltd | Transport & logistics | 2022 |
| Tashima Handmade Limited | Manufacturing | 2024 |
| Tata’S Kitchen Ltd | Hospitality | 2025 |
| Tavares Dias Limited | Professional & scientific | 2024 |
| Tawakkul Property Limited | Households | 2021 |
| Team Star Games Ltd | Arts & recreation | 2012 |
| Team Star Sports Ltd | Arts & recreation | 2012 |
| Tebbs Consultancy Limited | Professional & scientific | 2023 |
| Tebi Capital Limited | Real estate | 2015 |
| Telnwa Investment Limited | Information & communication | 2022 |
| Temi Accounts Limited | Professional & scientific | 2016 |
| Temple Gothard Ltd | Administrative & support | 2021 |
| Tendify Limited | Administrative & support | 2024 |
| Terra Cotta Warriors Isle of Dogs Ltd | Real estate | 2019 |
| Testwood TA Limited | Hospitality | 2026 |
| Texaco Car Wash Ltd | Other services | 2017 |
| Thandiebrowne Ltd | Administrative & support | 2024 |