| THE REX Asset Holdings (UK) Ltd | Wholesale & retail | 2017 |
| THE Shiatsu Space Ltd | Other services | 2024 |
| THE Smile Clinic (England) Limited | Health & social care | 2013 |
| THE T Bird Gifts Limited | Professional & scientific | 2016 |
| THE Tiger Moon Trading Company Limited | Information & communication | 2004 |
| THE Tradelink International Group Limited | Wholesale & retail | 2008 |
| THE Valve & Actuation Group Limited | Wholesale & retail | 2018 |
| THE Valve Alliance Limited | Wholesale & retail | 1998 |
| THE Valve Partners Limited | Wholesale & retail | 2004 |
| THE Venetian Carousel Co Limited | Arts & recreation | 2014 |
| THE Wine & Hamper Company Ltd | Hospitality | 2007 |
| THE Wooden Chopping Board Company Ltd | Manufacturing | 2016 |
| Theagency Limited | Administrative & support | 2021 |
| Theodore Business Fixers Ltd | Professional & scientific | 2024 |
| Thermal Insulation and Pipe Fitting Ltd | Construction | 2023 |
| Thincats Lending Club Limited | Financial services | 2012 |
| Think Disruptive Limited | Information & communication | 2008 |
| Thomas & Cooper Legal Services Ltd | Professional & scientific | 2014 |
| Thomas Elliott Limited | Professional & scientific | 2007 |
| Thomas Kelly Developments Ltd | Manufacturing | 2019 |
| Thomson Construction Ltd | Construction | 2024 |
| Thornley's Travel Ltd | Administrative & support | 2014 |
| Thornton Nurseries Ltd | Manufacturing | 2011 |
| Three Point Design Ltd | Manufacturing | 2002 |
| Three Point Ventures Ltd | Financial services | 2024 |
| Thringstone Primary School Academy Trust | Education | 2013 |
| Tiger Autos Ltd | Wholesale & retail | 2012 |
| Tiger Capital Ventures Ltd | Real estate | 2020 |
| TIM James Clark Architecture Ltd | Professional & scientific | 2024 |
| Timber Neutral Limited | Wholesale & retail | 2005 |
| Timber Packaging and Pallet Confederation | Other services | 1990 |
| Titan Carbon Works Ltd | Manufacturing | 2026 |
| TJ Saini Transport Ltd | Transport & logistics | 2025 |
| TJA Commercials Ltd | Wholesale & retail | 2022 |
| Tjeg Cargo Ltd | Transport & logistics | 2023 |
| TK Autocentres Long Eaton Ltd | Wholesale & retail | 2022 |
| TK Autocentres Loughborough Ltd | Manufacturing | 2025 |
| TKL Motion Pictures Ltd | Information & communication | 2020 |
| TMC Distribution Holdings Limited | Financial services | 2017 |
| TMS Coatings Ltd | Construction | 2020 |
| Tndgc Limited | Arts & recreation | 2025 |
| Toastie Explorer Limited | Wholesale & retail | 2020 |
| Tobi Toba Limited | Professional & scientific | 2012 |
| Toddle Town Coalville C.I.C. | Other services | 2025 |
| TOM Kelly Group Ltd | Professional & scientific | 2020 |
| Tom-Electrix Ltd | Construction | 2020 |
| Tomnik Limited | Professional & scientific | 1972 |
| Tongue Electrical Services Limited | Construction | 2014 |
| Toni Cook Enterprises Ltd | Administrative & support | 2015 |
| Toni's Ironing Angels Ltd. | Other services | 2010 |
| Tony Haggis Consulting Ltd | Professional & scientific | 2013 |
| Toogood Consultants Limited | Real estate | 2014 |
| Toogoods Ltd | Transport & logistics | 2018 |
| Toor Haulage Limited | Transport & logistics | 2017 |
| Toor Poroperty Ltd | Households | 2026 |
| Top & Tail Brickwork Ltd | Construction | 2024 |
| Top Cover Medics Ltd | Health & social care | 2022 |
| Top Drivers (Leicestershire) Ltd | Education | 2025 |
| Topline Design & Build Ltd | Construction | 2013 |
| Toplords Limited | Real estate | 1977 |
| Torecri Ltd | Transport & logistics | 2019 |
| Torex Semiconductor Europe Limited | Administrative & support | 2001 |
| Torr & Manley Projects Limited | Construction | 2024 |
| Torva UK Europe Ltd | Manufacturing | 2025 |
| Totally Balanced Limited | Professional & scientific | 2004 |
| Tovar Ltd | Wholesale & retail | 2024 |
| TP Prime Ltd | Real estate | 2019 |
| TPG Construction Services Limited | Professional & scientific | 2014 |
| Tracevita Ltd | Information & communication | 2026 |
| Trackitall Limited | Manufacturing | 2009 |
| Tradeline Roofing Ltd | Construction | 2026 |
| Tradingall Limited | Wholesale & retail | 2011 |
| Training Academy @ Dogtastic Ltd | Agriculture & fishing | 2023 |
| Trans-Continental Marketing Limited | Manufacturing | 1993 |
| Transcool (UK) Limited | Construction | 2004 |
| Translewko Ltd | Transport & logistics | 2015 |
| Translin Ltd | Transport & logistics | 2018 |
| TRC Alarms Ltd | Administrative & support | 2021 |
| Trencherwood Commercial Limited | Extraterritorial | 1985 |
| Trencherwood Construction Limited | Extraterritorial | 1973 |
| Trencherwood Developments Limited | Professional & scientific | 1984 |
| Trencherwood Estates Limited | Extraterritorial | 1981 |
| Trencherwood Group Services Limited | Other services | 1988 |
| Trencherwood Homes (Holdings) Limited | Extraterritorial | 1987 |
| Trencherwood Homes (Midlands) Limited | Extraterritorial | 1980 |
| Trencherwood Homes (South Western) Limited | Extraterritorial | 1980 |
| Trencherwood Homes (Southern) Limited | Extraterritorial | 1978 |
| Trencherwood Homes Limited | Extraterritorial | 1967 |
| Trencherwood Housing Developments Limited | Extraterritorial | 1972 |
| Trencherwood Investments Limited | Extraterritorial | 1981 |
| Trencherwood Land Holdings Limited | Extraterritorial | 1980 |
| Trencherwood Land Limited | Extraterritorial | 1978 |
| Trencherwood Retirement Homes Limited | Extraterritorial | 1980 |
| Trent Developments (Midlands) Ltd | Construction | 2020 |
| Trent Pumps Ltd | Professional & scientific | 2019 |
| Tricksall Limited | Wholesale & retail | 2018 |
| Trimark Europe Limited | Manufacturing | 1997 |
| Trust Accommodation Ltd | Real estate | 2021 |
| TT Computing Limited | Professional & scientific | 2002 |
| Tulsi Candles Ltd | Manufacturing | 2025 |