| Southon Fabrications Limited | Construction | 2011 |
| Sparkline Commercial Supplies Ltd | Wholesale & retail | 2025 |
| Speed Cartrans Limited | Transport & logistics | 2023 |
| Sphinx Wear Limited | Manufacturing | 2015 |
| Spring Landscapes Ltd | Professional & scientific | 2026 |
| Squad PT Limited | Arts & recreation | 2019 |
| SR GAS Services Limited | Construction | 2018 |
| SR2 Ltd | Information & communication | 2022 |
| Sree Annapoorna Foods Limited | Wholesale & retail | 2018 |
| SRH Waste Management Ltd | Water & waste | 2018 |
| SRK Wing Ltd | Information & communication | 2025 |
| SSA Electrical Services Ltd | Construction | 2022 |
| Ssiron Ltd | Construction | 2021 |
| SSP Golf Limited | Hospitality | 2009 |
| SST Builders Ltd | Construction | 2026 |
| ST James Haven Ltd | Health & social care | 2025 |
| Sta-Nik Limited | Construction | 2022 |
| Stand&Delivermilitaria Ltd | Wholesale & retail | 2024 |
| Stanlucsolution Ltd | Transport & logistics | 2023 |
| Staples Shipping Ltd | Transport & logistics | 2025 |
| Starbrooke Care Ltd. | Extraterritorial | 2014 |
| Starbrooke Care Services Limited | Health & social care | 2012 |
| Status-Lux Ltd | Construction | 2017 |
| Stefan ST Limited | Construction | 2012 |
| Steff-Annie Limited | Health & social care | 2022 |
| Steffin Fiscal Services Ltd | Professional & scientific | 2024 |
| Sterlingclean Ltd | Administrative & support | 2025 |
| STK Building Contractors Ltd | Construction | 2017 |
| Strand and Style Limited | Transport & logistics | 2025 |
| Strata Property Solutions Ltd | Real estate | 2024 |
| Strategy Glow Limited | Other services | 2026 |
| Stratos Consulting Ltd | Information & communication | 2026 |
| Strong Girl CIC | Education | 2025 |
| Strong Will Ltd | Transport & logistics | 2014 |
| Stroybat Ltd | Construction | 2017 |
| Structuresec Ltd | Administrative & support | 2026 |
| Stuart Layton Golf Ranges Limited | Arts & recreation | 2019 |
| Studio Elvo Limited | Construction | 2024 |
| STV Solutions Limited | Construction | 2014 |
| Stylists' Choice Ltd | Wholesale & retail | 2020 |
| SUE Moxley Beauty & Health Ltd | Health & social care | 2023 |
| Sumit Contractors Limited | Professional & scientific | 2013 |
| Summer Sky Property Ltd | Construction | 2026 |
| Summit Hospitality Group Ltd | Hospitality | 2026 |
| Sumo Analytics Limited | Information & communication | 2023 |
| Sun and Moon Playcare Scheme Limited | Education | 2016 |
| Sunvill Services Limited | Transport & logistics | 2025 |
| SUPERLED28 Limited | Manufacturing | 2025 |
| Supsec UK Ltd | Administrative & support | 2021 |
| Surrey Propco Limited | Real estate | 2020 |
| Surrey Steel Architectural (London) Limited | Manufacturing | 2020 |
| Surrey Steel Installations Limited | Construction | 2021 |
| Sussed Online Ltd | Information & communication | 2019 |
| SVB Retail Consulting Ltd | Professional & scientific | 2024 |
| SVR Interior Ltd | Construction | 2026 |
| Swift Glide Logistics Ltd | Transport & logistics | 2025 |
| Swift Run Ltd | Construction | 2025 |
| Swiftmove Logistics Ltd | Transport & logistics | 2025 |
| Synergic Impact Incorporated Ltd | Professional & scientific | 2022 |
| Szytula Cleaning Ltd | Administrative & support | 2019 |
| T S Assets Ltd | Real estate | 2019 |
| T&T Plumbing and Heating Ltd | Construction | 2024 |
| T-Line Technology Limited | Information & communication | 2017 |
| T. Trusler Electrical Services Ltd | Construction | 2026 |
| T.S.G Scaffolding Ltd | Construction | 2013 |
| T.W.Leach Limited | Wholesale & retail | 1959 |
| T3MIE Consultants Limited | Professional & scientific | 2017 |
| TA BUI Group Ltd | Real estate | 2026 |
| Talent INK Ltd | Professional & scientific | 2018 |
| TAO Resources Limited | Health & social care | 2013 |
| Tardmus Limited | Health & social care | 2016 |
| Tasnim Link Ltd | Transport & logistics | 2024 |
| Taste Afrique Limited | Hospitality | 2020 |
| TAT Bbabal Limited | Health & social care | 2015 |
| Tatenda. S . Limited | Health & social care | 2008 |
| Tauri Royale Ltd | Wholesale & retail | 2025 |
| Taxfolio Ltd | Professional & scientific | 2025 |
| Taylor Tutors and Consultancy Limited | Professional & scientific | 2016 |
| Taylorsoneandco Limited | Transport & logistics | 2024 |
| Tayos Security Services Ltd | Financial services | 2024 |
| TB Trailer Rentals Limited | Administrative & support | 2017 |
| TCD Dylan Ltd | Transport & logistics | 2026 |
| Tech Acumen Ltd | Information & communication | 2022 |
| TECH4LESS Ltd | Wholesale & retail | 2025 |
| Teddy's Carpentry Limited | Other services | 2015 |
| Tejroop Transport Limited | Transport & logistics | 2025 |
| Temstar Cleaning Services Ltd | Administrative & support | 2018 |
| TENTWENTYNINE25 Limited | Professional & scientific | 2025 |
| Tenx Partners Limited | Professional & scientific | 2025 |
| Teo's Transport Ltd | Transport & logistics | 2025 |
| Tessy Trans Limited | Transport & logistics | 2026 |
| TF Leisure Ltd | Hospitality | 2025 |
| TGC Holdco Limited | Financial services | 2025 |
| TGV Ltd | Transport & logistics | 2026 |
| Thames Sofa and Furniture Ltd | Wholesale & retail | 2020 |
| Thames Gateway Edequity CIC | Education | 2026 |
| Thames Mooring Services Limited | Manufacturing | 2023 |
| Thameside Logistics Solutions Ltd | Transport & logistics | 2024 |
| Thazin Limited | Wholesale & retail | 2018 |
| THE Aesthetical Nurse Ltd | Other services | 2024 |