| Supersized Ltd | Professional & scientific | 2022 |
| Suresafe Electrical & Compliance Ltd | Professional & scientific | 2022 |
| Surge Big Limited | Wholesale & retail | 2024 |
| Suri-Ogilvie Solutions Ltd | Information & communication | 2023 |
| Surtec Kent Limited | Professional & scientific | 2010 |
| Sushi Moto & Bento Ltd | Hospitality | 2023 |
| Sustainable Arts Collective Ltd | Manufacturing | 2024 |
| Sustainable Environmental Systems Limited | Administrative & support | 1998 |
| Swaffield Bros. (Furnishers) Limited | Wholesale & retail | 1972 |
| Swain European Limited | Transport & logistics | 2021 |
| Swain Logistics Solutions Limited | Wholesale & retail | 2002 |
| Swanley Computers (Kent) Ltd | Wholesale & retail | 2020 |
| Swanley Computers Ltd | Other services | 2022 |
| Swann Consulting Ltd | Professional & scientific | 2024 |
| Swanscombe Auto Centre Limited | Administrative & support | 2005 |
| Sway Scientific Limited | Professional & scientific | 2024 |
| Sweet Guest House Ltd | Hospitality | 2017 |
| Sweet One Caribbean Cuisine Ltd | Hospitality | 2024 |
| Sweet Setts Ltd | Real estate | 2022 |
| Sweetbw Ltd | Wholesale & retail | 2024 |
| Swift Energy Group Limited | Extraterritorial | 2014 |
| Swift Energy Ltd | Extraterritorial | 2014 |
| Swiftsure Electrical Ltd | Construction | 2018 |
| Swisscare Innovations Limited | Construction | 2024 |
| Sword Civils Limited | Construction | 2024 |
| Sword Logistics Limited | Construction | 2015 |
| Syanu Homes Ltd | Real estate | 2025 |
| Syoptic Ltd | Manufacturing | 2022 |
| Syroco Services Ltd | Information & communication | 2022 |
| SYS Global Group Ltd | Financial services | 2022 |
| Syscia Ltd | Information & communication | 2024 |
| Syshomes Ltd | Real estate | 2021 |
| Sysnetworks Ltd | Information & communication | 2012 |
| SZR Ltd | Transport & logistics | 2017 |
| SZS Holdings Limited | Real estate | 2019 |
| T & J Capell Limited | Financial services | 2013 |
| T & J Catering Services Limited | Hospitality | 2023 |
| T B Doherty Ltd | Construction | 2023 |
| T D Services South East Ltd | Professional & scientific | 2018 |
| T Elliott Carpentry Limited | Construction | 2013 |
| T H Flooring Ltd | Construction | 2014 |
| T J Barnes Autos Ltd | Wholesale & retail | 2022 |
| T L EKE Limited | Construction | 2015 |
| T Menditta Ltd | Construction | 2015 |
| T S (MCR) Limited | Health & social care | 2020 |
| T&B Commissioning Services Limited | Construction | 2013 |
| T&J Logistics Ltd | Transport & logistics | 2020 |
| T&K Investment Ltd | Real estate | 2023 |
| T&Lw Ltd | Wholesale & retail | 2019 |
| T&M Coffee Supplies Limited | Wholesale & retail | 2019 |
| T&W Medical Limited | Health & social care | 2019 |
| T-Square OIL and GAS Ltd | Extraterritorial | 2025 |
| T. & S. Acoustic Contracts Ltd. | Construction | 1993 |
| T. Carpentry Ltd | Construction | 2004 |
| T.A. Edwards Ltd | Information & communication | 2018 |
| T.B. Financial Service Ltd | Professional & scientific | 2019 |
| T.Bonard Electrical Ltd | Construction | 2021 |
| T.H. Agency Limited | Financial services | 2024 |
| T.K. Property Developments Limited | Construction | 2002 |
| T.Ryan Limited | Energy | 2006 |
| T.W.O Taxi World Order Medway Ltd | Transport & logistics | 2024 |
| TAC Assets UK Ltd | Real estate | 2025 |
| TAC Perfumes & Cosmetics (UK) Ltd | Manufacturing | 2018 |
| Tac-Asset & Investment UK Ltd. | Financial services | 2017 |
| Tagaluci Ltd | Transport & logistics | 2020 |
| Taguard Limited | Administrative & support | 2001 |
| Tahrims VISION2050 Ltd | Hospitality | 2024 |
| Taihirion Properties Limited | Professional & scientific | 2003 |
| Tailtime Therapy Ltd | Other services | 2025 |
| Taitai Allied Limited | Real estate | 2020 |
| TAJ Cuisine Ltd | Hospitality | 2003 |
| TAJ Property Services Limited | Real estate | 2018 |
| TAK Associates Limited | Real estate | 2015 |
| Take Care (South East) Ltd | Public administration | 2007 |
| Talaska Development Limited | Real estate | 2017 |
| Talentbasket Limited | Information & communication | 2025 |
| Talk and Resolve Mediation Limited | Professional & scientific | 2017 |
| Tall Order Entertainments Ltd | Arts & recreation | 2016 |
| Tall Trees Events Limited | Arts & recreation | 2021 |
| Tamac Properties Limited | Real estate | 2016 |
| Tamngrove Limited | Wholesale & retail | 2007 |
| Tamoria Group Ltd | Wholesale & retail | 2026 |
| Tannis Elizabeth Limited | Wholesale & retail | 2025 |
| Tans Global Services Ltd | Transport & logistics | 2025 |
| Tansley Ceramics Limited | Construction | 2026 |
| Tantash Consultancy Limited | Information & communication | 2011 |
| Tanton Contracts Limited | Other services | 2015 |
| Tantri Properties Limited | Real estate | 2022 |
| Tantri Trading Services Ltd | Administrative & support | 2017 |
| Tantrixx Limited | Extraterritorial | 2019 |
| Tanzania Delicious Cashews Ltd | Manufacturing | 2026 |
| TAO Operations Limited | Mining & quarrying | 2019 |
| Tapas & Tacos Limited | Hospitality | 2024 |
| Tappan Properties Limited | Real estate | 2025 |
| Tapsnat Trading Limited | Health & social care | 2020 |
| Tara Lancaster Virtual Assistant Services Ltd | Administrative & support | 2024 |
| Tara Martins Community Project CIC | Hospitality | 2016 |
| Target Buildings Services Limited | Construction | 2020 |
| Targetventure Limited | Professional & scientific | 1998 |
| Tarkan Mobile Barbers Ltd | Other services | 2019 |