| SMB Engineering Limited | Professional & scientific | 2025 |
| Smile Kent Ltd | Administrative & support | 2015 |
| SMR Property Holdings Limited | Real estate | 2020 |
| Sonya Sanzullo Ltd | Health & social care | 2017 |
| Sophisticate Limited | Wholesale & retail | 2023 |
| Sortacc and Co Ltd | Professional & scientific | 2022 |
| Sortacc Fellows Ltd | Professional & scientific | 2021 |
| Soulprime Services Ltd | Construction | 2026 |
| Soulsync Ltd | Wholesale & retail | 2025 |
| Spark Car Ltd | Wholesale & retail | 2023 |
| Springboard Health Limited | Health & social care | 2016 |
| Srinivasa Estates Limited | Real estate | 2025 |
| Srivalli Limited | Health & social care | 2024 |
| Srtby Ltd | Other services | 2018 |
| Ssik Limited | Arts & recreation | 2019 |
| Stacey Taylor Ltd | Extraterritorial | 2024 |
| Stairfix Direct Ltd | Construction | 2017 |
| Start Capital Limited | Professional & scientific | 2012 |
| Starwrick Limited | Administrative & support | 2012 |
| Starwrickhousing Limited | Hospitality | 2016 |
| Stephanie Boateng Ltd | Information & communication | 2019 |
| Stephenson & Ephgrave Limited | Transport & logistics | 1950 |
| Stone Healthcare Limited | Health & social care | 2017 |
| Strayfield Limited | Manufacturing | 2005 |
| Stuart RAY Limited | Manufacturing | 2014 |
| Studio T Ltd | Arts & recreation | 2018 |
| Style ID Limited | Wholesale & retail | 2012 |
| Styluxecloset Ltd | Wholesale & retail | 2025 |
| Summer Skies Ltd | Health & social care | 2020 |
| Supreme Childcare Services Limited | Administrative & support | 2021 |
| SVL Projects Ltd | Construction | 2025 |
| SVT Collisions Ltd | Professional & scientific | 2026 |
| Sward Communications Ltd | Other services | 2023 |
| Swift Holdings and Investments Limited | Financial services | 2021 |
| Swift Home and Window Improvements Ltd | Construction | 2025 |
| Swift Home Improvements Ltd | Construction | 1998 |
| Sync Recruitment Solutions Ltd | Administrative & support | 2022 |
| Synth Pro Group Ltd | Professional & scientific | 2025 |
| T and K Mortgages Limited | Financial services | 2024 |
| T&A Investment Studio Ltd | Real estate | 2026 |
| T'Unique Health Care and Services Ltd | Health & social care | 2017 |
| T4TADE Limited | Hospitality | 2023 |
| Talk & PAY Communications & Finance Limited | Information & communication | 2025 |
| Taskbuddys Ltd | Information & communication | 2026 |
| Tatar Engineering and Consulting Ltd | Construction | 2019 |
| Tavistock Properties Limited | Real estate | 2022 |
| Tax Solutions & Accounting Services LLP | | 2019 |
| Taxwise Wealth Management Ltd | Financial services | 2024 |
| Teal and Bloom Consultancy Ltd | Professional & scientific | 2018 |
| Tebanj UK Limited | Transport & logistics | 2020 |
| Techrim Ltd | Wholesale & retail | 2024 |
| Tenzile Wimpy Limited | Hospitality | 2024 |
| Teqnia Hub Ltd | Transport & logistics | 2023 |
| Test, Inspection and Certification Support Services Limited | Professional & scientific | 2023 |
| TFA Media Ltd | Wholesale & retail | 2022 |
| TG Logistic Solutions Ltd | Transport & logistics | 2012 |
| THE Adhd OT Ltd | Other services | 2023 |
| THE Apostolic Church (Lawna) London Limited | Other services | 2020 |
| THE ARK Global Education UK Ltd | Education | 2023 |
| THE ARK Global Fashion Limited | Wholesale & retail | 2024 |
| THE Black Book Guide Ltd | Administrative & support | 2020 |
| THE Bureau Accounting Ltd | Professional & scientific | 2008 |
| THE East Africa Company Limited | Transport & logistics | 1971 |
| THE Hollies Greenhithe (Management Company) Limited | Households | 1995 |
| THE Hundoshi Clothing Company Ltd | Education | 2015 |
| THE Kent Event Planner Ltd | Administrative & support | 2025 |
| THE London Tea Company Limited | Transport & logistics | 1983 |
| THE New Shepherds Limited | Health & social care | 2021 |
| THE Nile Tea Company Limited | Transport & logistics | 1987 |
| THE Well Brunch Ltd | Hospitality | 2025 |
| Thelawgarage Limited | Wholesale & retail | 2025 |
| Thianahs Kitchen Limited | Hospitality | 2022 |
| Think Big Improvements Limited | Construction | 2016 |
| Threetempos Ltd | Professional & scientific | 2025 |
| Tiadara Limited | Information & communication | 2025 |
| Tialis Essential IT Financing Limited | Professional & scientific | 2011 |
| Tialis Essential IT Manage Limited | Information & communication | 1992 |
| Tiam Limited | Wholesale & retail | 2019 |
| Tijari MA Limited | Construction | 2021 |
| Tile Flex Ltd | Manufacturing | 2015 |
| TIM Brix Engineering and General Service Ltd | Wholesale & retail | 2023 |
| Tiny Wonders Nurseries & Services Ltd | Education | 2010 |
| Tips 1 Limited | Construction | 2017 |
| TJ Horizon Ltd | Administrative & support | 2024 |
| TJD Logistics Limited | Transport & logistics | 2013 |
| Tkay Ltd | Professional & scientific | 2014 |
| TKT Carpentry Ltd | Construction | 2022 |
| TMR Contractors Ltd | Construction | 2025 |
| TMR Ventures Ltd | Real estate | 2024 |
| TNC Consulting Ltd | Administrative & support | 2022 |
| Tobiwani PVT Limited | Administrative & support | 2013 |
| Top Brand Outlet Ltd | Wholesale & retail | 2019 |
| Topnotch Management Limited | Other services | 2019 |
| Totemic Beauty Limited | Wholesale & retail | 2025 |
| Tower Fire Protection Ltd | Construction | 2021 |
| Tradertech Limited | Information & communication | 2015 |
| Trans Global Air Limited | Transport & logistics | 1981 |
| Trans Global Freight Limited | Transport & logistics | 1981 |
| Trans Global Freight Management Limited | Transport & logistics | 1976 |
| Trans Global Group Limited | Transport & logistics | 1970 |