| THE Showe Group Ltd | Information & communication | 2025 |
| THE Spotty Dog Place Ltd | Arts & recreation | 2021 |
| THE Tewkesbury Candle Company Limited | Wholesale & retail | 2021 |
| THE Three Molars Company Ltd | Health & social care | 2025 |
| THE World Within Limited | Administrative & support | 2016 |
| THE4WAYS Limited | Other services | 2022 |
| Theba Limited | Information & communication | 2012 |
| Theo's Restaurant Limited | Hospitality | 2019 |
| Theoc Construction Limited | Construction | 2015 |
| Theoc Consultancy Limited | Professional & scientific | 2024 |
| Theoc Hearing Limited | Wholesale & retail | 2023 |
| Thinking OUT Cloud Ltd | Wholesale & retail | 2018 |
| Thoroughly Good Ltd | Administrative & support | 2024 |
| Thought Gauge Executive Coaching Limited | Administrative & support | 2023 |
| Three Counties Bookkeeping Ltd | Professional & scientific | 2026 |
| Three Counties Joinery Limited | Manufacturing | 2013 |
| Three Counties Marketing Ltd | Transport & logistics | 2023 |
| Throgmorton Private Capital Limited | Financial services | 2002 |
| Thyrsus Consulting Limited | Professional & scientific | 2022 |
| Ticks Tasty Catering Company Ltd | Hospitality | 2025 |
| Tier One Security Solutions Ltd | Administrative & support | 2025 |
| TIG Weld Limited | Professional & scientific | 2010 |
| Tipo Sultan Ltd | Hospitality | 2026 |
| Tlam Group Limited | Information & communication | 2019 |
| Tlam Limited | Professional & scientific | 2008 |
| Tlam Technologies Ltd | Information & communication | 2014 |
| TLH Ltd | Administrative & support | 2015 |
| TMS Rugby Ltd | Professional & scientific | 2024 |
| TNS Ventures Ltd | Real estate | 2024 |
| TO Have and to Hold Records Limited | Wholesale & retail | 2019 |
| Tolsey Quay Management Limited | Real estate | 1996 |
| Top Marque Sports Ltd | Professional & scientific | 2024 |
| Topalov Ltd | Transport & logistics | 2014 |
| Total Automotives Bredon Ltd | Wholesale & retail | 2016 |
| Total Compliance Management Ltd | Professional & scientific | 2018 |
| Total Investment Holdings Limited | Financial services | 2024 |
| Towncrest Management Limited | Households | 2016 |
| Tpsystems Ltd | Professional & scientific | 2023 |
| Trafalgar Construction Management Services Ltd | Wholesale & retail | 2007 |
| Transadamo Ltd | Transport & logistics | 2024 |
| Translinear Semiconductors Limited | Manufacturing | 2005 |
| Treehugger Branding Limited | Administrative & support | 2021 |
| Treetop Investco Limited | Real estate | 2021 |
| Treetop Lettings Ltd | Hospitality | 2016 |
| Treetop Management Limited | Real estate | 2019 |
| Treetop Property LLP | | 2018 |
| Trelleborg Holdings UK Limited | Professional & scientific | 1997 |
| Trelleborg Industrial Products UK Ltd | Manufacturing | 1999 |
| Trelleborg Marine Systems UK Limited | Manufacturing | 1999 |
| Trelleborg Nottingham Limited | Manufacturing | 2001 |
| Trelleborg Offshore Barrow-In-Furness Limited | Extraterritorial | 1989 |
| Trelleborg Retford Limited | Manufacturing | 2001 |
| Trelleborg Rochdale Limited | Professional & scientific | 2007 |
| Trelleborg Sealing Solutions UK Limited | Manufacturing | 1947 |
| Trelleborg Sealing Solutions Weobley Holdings Limited | Professional & scientific | 1987 |
| Trelleborg Sealing Solutions Weobley Limited | Manufacturing | 1978 |
| Trelleborg Westbury Limited | Manufacturing | 1996 |
| Trex Explore Ltd | Arts & recreation | 2021 |
| Tribecka Developments Limited | Real estate | 2017 |
| Tribecka Retail Limited | Wholesale & retail | 2020 |
| Trio Motion Technology Limited | Manufacturing | 1987 |
| Triple James Limited | Extraterritorial | 2023 |
| Troop Creative Development Ltd | Information & communication | 2017 |
| True HR Services Ltd | Administrative & support | 2022 |
| TS Analytics Limited | Information & communication | 2015 |
| Tsfh Holdings Limited | Financial services | 2025 |
| Tumble Kidz Ltd | Arts & recreation | 2025 |
| Turland Joinery (Tewkesbury) Limited | Manufacturing | 1993 |
| Turner Stokes Holdings Limited | Financial services | 2025 |
| Turquaz Food Ltd | Hospitality | 2025 |
| Twenty Eight Communications Limited | Administrative & support | 2016 |
| Twixtbears Management Company Limited | Households | 1971 |
| Two Rivers Construction Ltd | Construction | 2015 |
| Twyncyn Developments Limited | Real estate | 1971 |
| Twyning Business Solutions Limited | Information & communication | 1997 |
| Twyning Garage Limited | Wholesale & retail | 2012 |
| Twyning Manor Management Company Limited | Households | 2005 |
| Tyler Medical Academy Ltd | Administrative & support | 2026 |
| Tyler Training Academy Ltd | Education | 2023 |
| UK Food and Drink Ltd | Wholesale & retail | 2019 |
| Ukpf Estates Limited | Real estate | 2019 |
| Ultimate Birdscarer Limited | Manufacturing | 2026 |
| UMU HSA Limited | Wholesale & retail | 2014 |
| Uncle Kelv’S Ltd | Hospitality | 2026 |
| Union Street Property Ltd | Real estate | 2020 |
| Unique Bathroom Installations Ltd | Construction | 2022 |
| United in Defence Ltd | Professional & scientific | 2024 |
| Upper Norton Jersey Cream Co. Limited | Extraterritorial | 1959 |
| Urban MAN Caves Limited | Construction | 2022 |
| Utilitopia Limited | Administrative & support | 2008 |
| Utility Detection Ltd | Professional & scientific | 2015 |
| Utilityone Limited | Wholesale & retail | 2016 |
| UTU Design Ltd | Professional & scientific | 2010 |
| V Hub Ltd | Wholesale & retail | 2008 |
| V Hub Service Limited | Wholesale & retail | 2013 |
| V-Hub Performance Ltd | Administrative & support | 2017 |
| Valectra LLP | | 2001 |
| Valhalla UK Holdings Limited | Financial services | 2022 |
| Valkyrie Chauffeurs Ltd | Transport & logistics | 2018 |
| Vally Plant Training Ltd | Construction | 2014 |