| Totolo Limited | Administrative & support | 2012 |
| Totym Ltd | Wholesale & retail | 2025 |
| Touch of Comfort Healthcare Limited | Health & social care | 2021 |
| Touch of Thai Ltd | Other services | 2025 |
| Tout Entreprises Ltd | Construction | 2023 |
| Towering Equipment Rentals Limited | Administrative & support | 2025 |
| Town & City Builders Limited | Construction | 1988 |
| Town Vape Ltd | Wholesale & retail | 2026 |
| Townsend Precision Labs Ltd | Professional & scientific | 2024 |
| Townsley Dwellings Ltd | Real estate | 2026 |
| Townway Limited | Households | 1981 |
| TP Property Developments Ltd | Real estate | 2021 |
| Tpcm Ltd | Health & social care | 2020 |
| TPD Enterprises Ltd | Professional & scientific | 2001 |
| Tpjr Professional Services Ltd | Professional & scientific | 2023 |
| TPL Logistics UK Ltd | Transport & logistics | 2016 |
| Tracey's Hair Ltd | Other services | 2008 |
| Track Components Ltd | Manufacturing | 2003 |
| Track Group Holdings Limited | Financial services | 2020 |
| Track Medical Limited | Manufacturing | 2021 |
| Track Screw Limited | Administrative & support | 2014 |
| Trade 'N' Save Centre Limited | Wholesale & retail | 2012 |
| Trade Plant & Tool Hire (Southampton) Limited | Administrative & support | 2020 |
| Trade Plant & Tool Hire Ltd | Administrative & support | 2018 |
| Trade Plant Painting & Decorating Services Ltd | Construction | 2021 |
| Trade Safety & Training Ltd | Education | 2019 |
| Tradeframe.Com Limited | Wholesale & retail | 2009 |
| Tradershire Ltd | Wholesale & retail | 2024 |
| Trading Table Events Ltd | Administrative & support | 2026 |
| Traditional Surveyors Limited | Professional & scientific | 2022 |
| Trafalgar Takeaway Ltd | Hospitality | 2016 |
| Traffic Consultant Limited | Construction | 2025 |
| Trailer Legends Ltd | Wholesale & retail | 2024 |
| Trakasolutions Ltd | Other services | 2025 |
| Trans Continental Holdings (UK) Limited | Financial services | 2000 |
| Trans-National Services Limited | | 1991 |
| Transforming Minds Limited | Administrative & support | 2021 |
| Transition Creative Limited | Professional & scientific | 2014 |
| Transitions Solutions Ltd | Professional & scientific | 2025 |
| Transitions Supported Living Ltd | Health & social care | 2013 |
| Transnational Corporation Limited | Extraterritorial | 2013 |
| Transvolt Power Solutions Limited | Manufacturing | 2024 |
| Travancore Blakeney Limited | Wholesale & retail | 2022 |
| Travel Royally Ltd | Administrative & support | 2025 |
| Travel Seats Limited | Transport & logistics | 2022 |
| Treasure Traders Ltd | Wholesale & retail | 2025 |
| Treasure-Finds Enterprise Limited | Wholesale & retail | 2026 |
| Treasuretroy Limited | Health & social care | 2022 |
| Treats 4U Limited | Manufacturing | 2020 |
| Trebbz Couriers Ltd | Transport & logistics | 2025 |
| Tredworth Caterers Limited | Hospitality | 2015 |
| Tree Surgeon Gloucester Ltd | Administrative & support | 2023 |
| Treeway Motor Repairs Ltd | Wholesale & retail | 2023 |
| Treffos Ltd | Financial services | 2012 |
| Trenchless Co Ltd | Construction | 2025 |
| Trent Quinn Ltd | Construction | 2022 |
| TRENTEND3 Property Management Limited | Real estate | 2021 |
| Trew Audio Ltd | Extraterritorial | 2024 |
| Trewena Properties Limited | Real estate | 1999 |
| Tri-Iron Limited | Information & communication | 2024 |
| Tri-Shool FIC Limited | Real estate | 2025 |
| Triad Kebab Delight Ltd | Hospitality | 2026 |
| Trial by Fire Ltd | Information & communication | 2024 |
| Trinity Healthcare Solutions Ltd | Health & social care | 2020 |
| Trinity RE Limited | Real estate | 2026 |
| Trinity Service Management Limited | Information & communication | 2011 |
| Trinity Services (Gloucestershire) Ltd | Construction | 2019 |
| Trion-Texx Ltd | Wholesale & retail | 2022 |
| Trioscape Garden Centre Limited | Wholesale & retail | 2005 |
| Tripcatcher Ltd | Information & communication | 2014 |
| Triple 5 Triple 4 Taxis Ltd | Transport & logistics | 2014 |
| Triple 9 Event Solutions Ltd | Administrative & support | 2019 |
| Triple ACS Ltd | Transport & logistics | 2025 |
| Tritech Compli Ltd | Information & communication | 2021 |
| Triton Aviation Limited | Education | 2020 |
| Trixy Healthcare Ltd | Health & social care | 2025 |
| TRJ Property Ltd | Financial services | 2015 |
| Trojan Free Fighters Limited | Education | 2014 |
| Trolver Limited | Real estate | 2018 |
| Troops Properties Ltd | Real estate | 2020 |
| Trouthouse Fishery Limited | Hospitality | 1979 |
| Troy Coles Limited | Administrative & support | 2018 |
| Truck-King Transport Ltd | Transport & logistics | 2017 |
| Truetrace Ltd | Administrative & support | 2018 |
| Truscott Jewellers Limited | Wholesale & retail | 2003 |
| Trust Circle Ltd | Water & waste | 2015 |
| Trusted Nest Ltd | Real estate | 2025 |
| Trusted Partners (Glos) Limited | Professional & scientific | 2015 |
| TRUSTPOINT360 Ltd | Information & communication | 2026 |
| Truth Boxing Club Limited | Arts & recreation | 2020 |
| Trybond Limited | Real estate | 2001 |
| TSL Electrical Ltd | Construction | 2014 |
| Tsukiko Ltd | Professional & scientific | 2017 |
| TT Enterprises Ltd | Wholesale & retail | 2025 |
| TT Traffic Ltd | Construction | 2024 |
| Ttbay Ltd | Information & communication | 2009 |
| Ttechspire Ltd | Information & communication | 2024 |
| TTS Concept Ltd | Construction | 2018 |
| TUATARA2 Medical Limited | Health & social care | 2018 |
| Tubby Tom's Ltd | Manufacturing | 2015 |