| THE Old Brewery Yard Ltd | Transport & logistics | 2025 |
| THE Old Sawmill Site Management Company Limited | Water & waste | 1995 |
| THE Original Bath Company Limited | Wholesale & retail | 2012 |
| THE Potmolen Paint Company Limited | Professional & scientific | 1991 |
| THE Renaissance Company Limited | Professional & scientific | 1985 |
| THE RYL Kitchen Ltd | Hospitality | 2025 |
| THE SEE Through News Newspaper Review Project Limited | Education | 2023 |
| THE Slow Vinegar Company Ltd | Manufacturing | 2019 |
| THE Small Block Company Limited | Real estate | 2015 |
| THE Somerset Soft Furnisher Ltd | Manufacturing | 2025 |
| THE Sound Post Limited | Wholesale & retail | 1995 |
| THE Splinter Group | | 1991 |
| THE Stables Chitterne Management Company Limited | Households | 1991 |
| THE TIN Snail Cafe Limited | Hospitality | 2015 |
| THE Upton Scudamore Community Association | Administrative & support | 2003 |
| THE Walled Garden Project CIC | Health & social care | 2023 |
| THE Wedding Guest Chaperone Ltd | Health & social care | 2023 |
| THE Wellbeing Hub Warminster CIC | Health & social care | 2024 |
| THE White Family PUB Company Ltd | Hospitality | 2025 |
| THE Woodlander Club Limited | Other services | 2025 |
| THE Woodlander Initiative Limited | Agriculture & fishing | 2023 |
| THE Wool Store Limited | Households | 2008 |
| Theia Systems Ltd | Manufacturing | 2014 |
| Thistle & Timber Ltd | Construction | 2026 |
| Thomas Equestrian Limited | Arts & recreation | 2000 |
| Thomas Warburtons Ltd | Wholesale & retail | 2025 |
| Thomas&Chansault Wine Ltd | Wholesale & retail | 2019 |
| Thomasholdingscompany Limited | Financial services | 2024 |
| Thomson Tree Services Limited | Agriculture & fishing | 2000 |
| Thornycroft, Giles & Associates Limited | Professional & scientific | 1970 |
| Tilehouse Property Limited | Real estate | 2024 |
| TIM Boughton Consulting Limited | Professional & scientific | 2014 |
| TIN Snail Tours Limited | Administrative & support | 2025 |
| Tinara Vale Interiors Ltd | Manufacturing | 2026 |
| Tirmor Ltd | Manufacturing | 2025 |
| TJP Utilities Ltd | Construction | 2021 |
| Tmcfood Limited | Administrative & support | 2016 |
| Tmti Holding Company Limited | Financial services | 2024 |
| Tmti Limited | Information & communication | 2000 |
| Tolladine Estates Limited | Real estate | 1995 |
| Top Draw Limited | Information & communication | 1988 |
| Torch Healthcare Services Ltd | Administrative & support | 2016 |
| Torus Holding Group Limited | Financial services | 2026 |
| Touchpaper Music Ltd | Administrative & support | 2016 |
| Tovo (Europe) Limited | Information & communication | 2007 |
| TRACE2O Limited | Manufacturing | 2011 |
| Trant Trade Ltd | Wholesale & retail | 2020 |
| Travxml Limited | Information & communication | 2005 |
| Treearc Limited | Manufacturing | 2016 |
| Trev's Workshop Ltd | Professional & scientific | 2026 |
| Trident IMG Ltd | Manufacturing | 2024 |
| True Protect (Protection Solutions) Ltd | Financial services | 2022 |
| True Story Brewing Limited | Manufacturing | 2021 |
| Trueno Cooks Limited | Hospitality | 2014 |
| TSH Digital Ltd | Wholesale & retail | 2013 |
| TSJ Homes Ltd | Construction | 2025 |
| Tulse Pictures Limited | Professional & scientific | 2019 |
| Turnpike Audio Ltd | Wholesale & retail | 2016 |
| Turnpike Court Limited | Households | 2010 |
| Twelque Limited | Wholesale & retail | 2025 |
| Two Counties Farm Ltd | Hospitality | 2023 |
| Two Rivers Sports Ltd | Agriculture & fishing | 2023 |
| TYR Defence and Security Ltd | Public administration | 2023 |
| UK Hemp Ltd | Manufacturing | 2020 |
| Upton Garden & Fencing Limited | Administrative & support | 2025 |
| Upton Vehicle Procurement Ltd | Professional & scientific | 2026 |
| Van Kappel Limited | Other services | 2008 |
| Van Vliet Film Ltd | Information & communication | 2019 |
| Vantage Aviation Limited | Transport & logistics | 2007 |
| Vantedge Spatial Ltd | Information & communication | 2026 |
| Vehicle Locksmith Solutions Ltd | Wholesale & retail | 2018 |
| Ventarc Limited | Manufacturing | 2000 |
| Venture Dairy Services Limited | Manufacturing | 2014 |
| Verwood MOT Centre Limited | Wholesale & retail | 1997 |
| VHB Systems Limited | Information & communication | 2010 |
| Viatrix Catering Ltd | Hospitality | 2025 |
| Vickers DA Costa Limited | Professional & scientific | 2002 |
| Visualax Ltd | Other services | 2021 |
| VT Equestrian Limited | Agriculture & fishing | 2018 |
| VT Sports Horses Limited | Agriculture & fishing | 2021 |
| VW Resurrection Ltd | Wholesale & retail | 2021 |
| W.T. Garrett Carpentry & Build Ltd | Manufacturing | 2025 |
| WALLING2RECOVERY - W2R Limited | Construction | 2024 |
| Ward & James Plastering Ltd | Construction | 2018 |
| Warminster Book Festival CIC | Wholesale & retail | 2024 |
| Warminster Contract Cleaners Ltd | Administrative & support | 2025 |
| Warminster Garden Services Ltd | Administrative & support | 2025 |
| Warminster Kitchen Limited | Hospitality | 2018 |
| Warminster Nails and Spa Ltd | Other services | 2025 |
| Warminster Preservation Trust Limited | Construction | 1987 |
| Warminster Storage Limited | Transport & logistics | 2018 |
| Warminster Tool Hire Limited | Administrative & support | 2023 |
| Warrior Equine C.I.C. | Health & social care | 2019 |
| Way-A-Head Designs Limited | Manufacturing | 2000 |
| Welledent Limited | Health & social care | 2012 |
| Wellow Brook Limited | Real estate | 1998 |
| West Brothers (Frome) Ltd | Financial services | 1947 |
| West Country Splashbacks Ltd | Construction | 2026 |
| West Country VET Limited | Professional & scientific | 2020 |
| West Farm Barns Management Company Limited | Real estate | 2004 |