| Tina Engell Limited | Wholesale & retail | 2009 |
| Tinderbox Search Consultants Limited | Administrative & support | 2009 |
| Tinkerbell Enterprises Ltd | Real estate | 2024 |
| Tinkerkind Ltd | Professional & scientific | 2024 |
| Tiora-London Ltd | Wholesale & retail | 2026 |
| Tipputs Grillhouse Limited | Real estate | 2015 |
| Tir-Y-Cwm Trust Limited | Hospitality | 1982 |
| Titham Limited | Construction | 2023 |
| Tivarri Limited | Information & communication | 2010 |
| TJ Electrical Services Ltd | Construction | 2018 |
| Tj's Burgers Bath Limited | Hospitality | 2025 |
| TK Logistics Limited | Transport & logistics | 2024 |
| TK Orthodontics Ltd | Health & social care | 2026 |
| TL Ceramics Ltd | Wholesale & retail | 2024 |
| TLC Roofing & Homes Ltd | Construction | 2026 |
| TM Planning Ltd | Professional & scientific | 2024 |
| Tmsc Bath Limited | Hospitality | 2016 |
| Tnrice Limited | Information & communication | 2026 |
| Tobias & Sons Ltd | Construction | 2025 |
| Tobias and the Angel Limited | Hospitality | 2015 |
| Tocca Ltd | Wholesale & retail | 2023 |
| Tokyo Kampo Limited | Wholesale & retail | 2021 |
| TOM at the Garage Ltd | Wholesale & retail | 2024 |
| TOM Brown Copywriting Ltd | Information & communication | 2013 |
| TOM Davis Ltd | Financial services | 2023 |
| TOM Giles Holdings Limited | Financial services | 2025 |
| Tomato Ventures Ltd | Professional & scientific | 2020 |
| Tomstrad Ltd | Manufacturing | 2022 |
| Tonick Solutions Limited | Information & communication | 2017 |
| Tonks Homes Ltd | Real estate | 2023 |
| Tonquani Travel Ltd | Administrative & support | 2023 |
| Tony Larkman Consulting Ltd | Professional & scientific | 2026 |
| Tony Thorne Foundation Limited | Professional & scientific | 2024 |
| Tony Weston International Limited | | 1988 |
| Tonz Limited | Manufacturing | 2025 |
| Toop Scaffolding & Roofing Limited | Construction | 2006 |
| Top 10 Golf Travel Ltd | Administrative & support | 2025 |
| Top Dog Mortgage Company Ltd | Financial services | 2017 |
| Topg (Providence ROW) Limited | Construction | 2000 |
| Topp Designs Limited | Administrative & support | 2002 |
| Topsteer Challenge Ltd | Arts & recreation | 2014 |
| Topsteer Ltd | Arts & recreation | 2014 |
| Torbay and South Devon Surgical Services Ltd | Health & social care | 2022 |
| Torcrest Ltd | Construction | 2021 |
| Total Fitness (Bath) Limited | Wholesale & retail | 1991 |
| Total Roofing Bath Ltd | Construction | 2023 |
| Total Solutions (U.K.) Limited | Real estate | 1987 |
| Total Stadium Solutions Ltd | Manufacturing | 2025 |
| Totally Tack Limited | Wholesale & retail | 2005 |
| Totalphase Limited | Households | 1986 |
| Touch Thai Massage Spa Ltd | Health & social care | 2014 |
| Touchdown Developments Limited | Financial services | 2003 |
| Touchdown Holdings Ltd | Financial services | 2005 |
| Touchpoint Training Limited | Real estate | 1998 |
| Touchstone Masonry Ltd | Construction | 2011 |
| Tourwest Limited | Administrative & support | 1993 |
| Tower House Properties (Bath) Limited | Real estate | 2003 |
| Towersey Festival Limited | Arts & recreation | 1995 |
| Town and Country Sales (Bath) Limited | Wholesale & retail | 2022 |
| Townsend Construction Management Ltd | Professional & scientific | 2010 |
| Townson Boyd Solutions Limited | Administrative & support | 2003 |
| Toxicology Consultancy Limited | Professional & scientific | 2021 |
| TR Roofing and Scaffolding Ltd | Construction | 2026 |
| Trade & Home Rentals Ltd | Real estate | 2022 |
| Tradex Bristol Limited | Wholesale & retail | 1997 |
| Tradlex Limited | Professional & scientific | 2020 |
| Trafalgar Gardens Management Limited | Households | 1999 |
| Trafalgar Road Management Company Limited | Households | 1986 |
| Trafalgar Square Limited | Construction | 1997 |
| Traffic Digital Limited | Information & communication | 2006 |
| Train Experiences Ltd | Professional & scientific | 2023 |
| Train With ID Ltd | Arts & recreation | 2019 |
| Train With ID Management Services Ltd | Health & social care | 2024 |
| Trakwaves Group Ltd | Wholesale & retail | 2024 |
| Tramire Limited | Information & communication | 2006 |
| Transatlantic Migration Limited | Professional & scientific | 2008 |
| Transcendent Ltd | Information & communication | 2016 |
| Transformation Inc Ltd | Education | 2020 |
| Transition Bath Limited | Other services | 2009 |
| TRANSITION15 Limited | Professional & scientific | 2015 |
| Transunion Petroleum Limited | Mining & quarrying | 2009 |
| Trauma Recovery Centre | Professional & scientific | 2011 |
| Tre-Morvu Management Company Limited | Households | 2020 |
| Treacle George Ltd | Wholesale & retail | 2017 |
| Tread Light Limited | Other services | 2017 |
| Treasure Moon Limited | Information & communication | 2016 |
| Treasure Toad Games Ltd | Manufacturing | 2024 |
| Tree Rise Management Company Limited | Households | 2022 |
| Tregura Limited | Professional & scientific | 2008 |
| Tremayne Services Limited | Professional & scientific | 2016 |
| Treminki Limited | Information & communication | 2006 |
| Trendies Limited | Hospitality | 2018 |
| Tres Comas Limited | Information & communication | 2019 |
| Tresorelle Films Limited | Information & communication | 2007 |
| Tresorelle Limited | Financial services | 2007 |
| Tressaway Europe Limited | Real estate | 2015 |
| Trevor Osborne Limited | Financial services | 1973 |
| Trevor Razzell Limited | Other services | 2015 |
| Tria-Aktiv (UK) Limited | Hospitality | 1987 |
| Triage+ Ltd | Professional & scientific | 2025 |