| Titsey Taproom (Park Hub) Limited | Hospitality | 2025 |
| Titsey Taproom Limited | Hospitality | 2022 |
| TJB Contract Services Ltd. | Information & communication | 2017 |
| TJL Advisory Ltd | Information & communication | 2025 |
| TKY Champions Limited | Information & communication | 2011 |
| TL Glazing Ltd | Construction | 2019 |
| TLC Outdoor Spaces Ltd | Administrative & support | 2024 |
| TMC Construction (SE) Limited | Construction | 2016 |
| Tmcb Homes Limited | Real estate | 2026 |
| TMD Capital Limited | Financial services | 2018 |
| TML HR Consultants Ltd | Administrative & support | 2012 |
| TMZ Evolution Limited | Professional & scientific | 2025 |
| TNL Carpentry & Joinery Ltd | Construction | 2013 |
| TNR Real Estate Limited | Real estate | 2021 |
| TNT Cars Limited | Transport & logistics | 1999 |
| Tobias Murray Limited | Information & communication | 2011 |
| Tobinife Limited | Administrative & support | 2016 |
| Toby Phillips Photography Limited | Professional & scientific | 2011 |
| Today Convenience Store Limited | Hospitality | 2025 |
| TOG Engage Ltd | Administrative & support | 2025 |
| Toknce Limited | Information & communication | 2025 |
| Tollgate (Isle of Wight) Management Company Limited | Real estate | 2009 |
| Tomd Limited | Extraterritorial | 2018 |
| TON Clearance Limited | Wholesale & retail | 2026 |
| Tones by Salome Ltd | Information & communication | 2024 |
| Tones Platform Ltd | Information & communication | 2026 |
| Tontuu Ltd | Health & social care | 2025 |
| Too-Bright Design Limited | Information & communication | 2011 |
| Tool Shed London Limited | Professional & scientific | 2016 |
| Top Drawer Executive Resourcing Limited | Administrative & support | 2010 |
| Top Knotts Ltd | Other services | 2016 |
| Top Shelf Packaging Ltd | Administrative & support | 2017 |
| Top Track Ltd | Administrative & support | 2004 |
| Topas Mobility Limited | Wholesale & retail | 2026 |
| Topcliff Properties Limited | Real estate | 1988 |
| Topguard Boarding Ltd | Agriculture & fishing | 2024 |
| Topguard Feeds Ltd | Wholesale & retail | 2022 |
| Toplevelview Ltd | Information & communication | 2023 |
| Topset Staging Limited | Manufacturing | 2002 |
| Tora Holdings Limited | Financial services | 2024 |
| Torastan Limited | Professional & scientific | 2023 |
| Torbay Holiday Properties Ltd | Hospitality | 2022 |
| Torbay Leisure Services Limited | Arts & recreation | 2015 |
| Toren Properties Limited | Construction | 2013 |
| Tosmc UK Ltd | Administrative & support | 2022 |
| Total Caring Ltd | Administrative & support | 2020 |
| Total Hot Tubs Limited | Wholesale & retail | 2007 |
| Total Imaging Limited | Manufacturing | 2010 |
| Total Information Security Ltd | Information & communication | 2010 |
| Total Mobile Mechanics Ltd | Wholesale & retail | 2025 |
| Total Motion Events Limited | Information & communication | 2015 |
| Total Movers Ltd | Transport & logistics | 2022 |
| Total Peach Limited | Real estate | 2007 |
| Total Roofing & Building Ltd | Construction | 2022 |
| Total Therapy Studios Ltd | Health & social care | 2013 |
| Total Transformations Group Ltd | Construction | 2024 |
| Touch Creative Design Limited | Administrative & support | 2006 |
| Touchays Bespoke Ltd | Hospitality | 2018 |
| Touchdown Aviation Limited | Transport & logistics | 1995 |
| Touchwood Animation Group Limited | Professional & scientific | 2006 |
| Touchwood Animation Limited | Information & communication | 1998 |
| Towerhall Solutions Ltd | Financial services | 2003 |
| Towerstile Ltd | Real estate | 1985 |
| Townsend Civil Ltd | Professional & scientific | 2026 |
| Tozer Capital Limited | Financial services | 2026 |
| TPD Software Ltd | Information & communication | 2025 |
| TPE Associates Ltd | Financial services | 2025 |
| TPS Export Ltd | Wholesale & retail | 2016 |
| TPS Plates Ltd | Wholesale & retail | 2026 |
| TPW Holdings Ltd | Other services | 2018 |
| Tradebase Limited | Extraterritorial | 2025 |
| Tradelink Publications Limited | Information & communication | 1999 |
| Tradex Logistics Limited | Wholesale & retail | 2014 |
| Traditional Pure Potions Ltd | Manufacturing | 2015 |
| Traditional Stone Limited | Manufacturing | 2012 |
| Traditional Stone Restoration Limited | Manufacturing | 2014 |
| Traditional Stone Restoration Services Ltd | Construction | 2017 |
| Trafalgar Cleaning Equipment Limited | Wholesale & retail | 1991 |
| Trafalgar Equipment Limited | Extraterritorial | 2016 |
| Train Wild Ltd | Education | 2022 |
| Trains on Tracks Limited | Manufacturing | 2022 |
| Trainslator Ltd | Information & communication | 2025 |
| Trak Eco Ltd | Professional & scientific | 2024 |
| Trak Performance Ltd | Wholesale & retail | 2025 |
| Trakmeister Limited | Administrative & support | 2026 |
| Trangmar Accounting Services Limited | Professional & scientific | 2023 |
| Transform Assets Limited | Real estate | 2021 |
| Transform Group Holdings Limited | Financial services | 2025 |
| Transformational Leadership Centre | Education | 2003 |
| Transformations Beauty Limited | Real estate | 2014 |
| Travelmood Limited | Administrative & support | 1985 |
| Travidz Limited | Information & communication | 2026 |
| Treadcroft Management Limited | Real estate | 1999 |
| Treat YOU Ltd | Manufacturing | 2021 |
| Tree L C Limited | Administrative & support | 2014 |
| Tree Line Dsigns Limited | Manufacturing | 2022 |
| Tree Marshalls Ltd | Administrative & support | 2022 |
| Treehouse Educare Limited | Health & social care | 2016 |
| Treehouse Properties Limited | Real estate | 2021 |
| Treetex Ltd | Administrative & support | 2026 |