| TIN Horse Embryonics Limited | Professional & scientific | 2004 |
| TIN Horse Holdings Limited | Financial services | 2023 |
| TIN Horse Trading Limited | Professional & scientific | 1993 |
| Tina Lister Limited | Other services | 2004 |
| Tipro Ltd | Transport & logistics | 2011 |
| Titan Business Development Ltd | Professional & scientific | 2024 |
| TMN Construction Services Limited | Construction | 2021 |
| Toca Consulting Ltd | Professional & scientific | 2024 |
| TOM Farncombe Weights Engineering Limited | Professional & scientific | 2023 |
| TOM Gristwood Architects Ltd | Professional & scientific | 2010 |
| TOM Robinson Limited | Hospitality | 2023 |
| Tomlin Properties Limited | Real estate | 1958 |
| Tommy Wood Ltd | Real estate | 2024 |
| Tony Wilson Consulting Ltd | Professional & scientific | 2014 |
| Top FIX Roofing & Cladding Ltd | Construction | 2024 |
| Topology Consulting Ltd | Information & communication | 2009 |
| Tosco Advisory Ltd | Professional & scientific | 2025 |
| Tosco Investments Limited | Real estate | 2022 |
| Town and Country Limited | Real estate | 1987 |
| Towpath Tails Dog Park Limited | Arts & recreation | 2021 |
| TPUNK2 Ltd | Professional & scientific | 2019 |
| Trabita Limited | Manufacturing | 2019 |
| Track Publicity Ltd | Professional & scientific | 2024 |
| Trackpoint Limited | Professional & scientific | 1998 |
| Tracy Leadbeater Ltd | Hospitality | 2022 |
| Transfrontier International Limited | Professional & scientific | 2000 |
| Traustr Advisory Limited | Professional & scientific | 2022 |
| Travel by Hannah Limited | Administrative & support | 2020 |
| Travel Hanger Limited | Wholesale & retail | 2024 |
| Travel Philanthropy Ltd | Professional & scientific | 2007 |
| Travels With Alice LLP | | 2013 |
| Trendx Digital Marketing Ltd | Professional & scientific | 2024 |
| Trevor Cook Construction Limited | Construction | 2010 |
| Triptree Consultancy Ltd | Professional & scientific | 2025 |
| Trudi Taylor Ltd | Professional & scientific | 2019 |
| Truvio Ltd | Professional & scientific | 2021 |
| Truvio Properties Limited | Real estate | 2022 |
| Tulsie Limited | Information & communication | 2025 |
| TVL Building and Groundworks Ltd | Construction | 2019 |
| TW Farriery Ltd | Other services | 2026 |
| TY Ganol Property Limited | Real estate | 2026 |
| Uceo Group Limited | Wholesale & retail | 2025 |
| UK & European Seasonal Staff & Payroll Solutions Ltd | Administrative & support | 2022 |
| UK Recruiter Limited | Information & communication | 2002 |
| Ulee Limited | Manufacturing | 2026 |
| UP and Running Couriers Limited | Transport & logistics | 2019 |
| Upright Scaffolding Services Ltd | Construction | 2015 |
| V Trading Limited | Wholesale & retail | 2024 |
| Vale Mapping Ltd | Professional & scientific | 2023 |
| Valency Properties Limited | Construction | 2009 |
| Valendine Ltd | Professional & scientific | 2022 |
| Valley View Building Management Limited | Households | 2008 |
| Valo Labs Ltd | Information & communication | 2026 |
| Valsorey Tech Ltd | Information & communication | 2019 |
| Vanquish Investment Group Limited | Wholesale & retail | 2017 |
| Vantage Festival Limited | Arts & recreation | 2023 |
| Variant Technology Limited | Manufacturing | 2017 |
| Vide Iterum Ltd | Administrative & support | 2021 |
| Viracom Ltd | Information & communication | 2015 |
| Virtual Candles Limited | Wholesale & retail | 2012 |
| Virtually Everything Limited | Administrative & support | 2000 |
| Visitor Plus Limited | Agriculture & fishing | 2003 |
| Vntra Ltd | Manufacturing | 2025 |
| Volta Electrical Solutions Limited | Construction | 2025 |
| W. Lund Machinery Ltd | Wholesale & retail | 2020 |
| W. Mundy & SON Ltd | Wholesale & retail | 1999 |
| W. Taylor (Frames) Ltd. | Manufacturing | 2002 |
| W.F Distribution Limited | Wholesale & retail | 2023 |
| W.J.Tatem Limited | Financial services | 1913 |
| W.R. Curnick Limited | Agriculture & fishing | 1957 |
| Wandering Mind Ltd | Administrative & support | 2017 |
| Warneford Gibbs Limited | Professional & scientific | 1988 |
| Watson Oils (Europe) Ltd | Administrative & support | 2023 |
| Watters Car & Commercial Limited | Wholesale & retail | 2010 |
| Waxen Airsoft Ltd | Wholesale & retail | 2022 |
| Waypoint Limited | Transport & logistics | 2001 |
| Well Loci Limited | Real estate | 2018 |
| Wellington House Property Management Company Limited | Real estate | 2013 |
| West Country Tool Hire Ltd | Administrative & support | 2023 |
| West Stowell Property Management Company Limited | Households | 1976 |
| West Street Motors (Aldbourne) Limited | Wholesale & retail | 1976 |
| Westhorpe Lewis Ltd | Professional & scientific | 2016 |
| WG Bulk Logistics Limited | Transport & logistics | 2009 |
| WG Recruitment Ltd | Administrative & support | 2015 |
| WHH Limited | Real estate | 2025 |
| White Hart Penton Ltd | Hospitality | 2024 |
| White Hart Stables Limited | Arts & recreation | 2010 |
| White Horse Bookshop Limited | Wholesale & retail | 1973 |
| White Horse Consulting Ltd | Professional & scientific | 2024 |
| White Poplar Consulting Ltd | Information & communication | 2021 |
| Whitehead Farming LLP | | 2006 |
| Whitehorse Consultancy Ltd | Professional & scientific | 2023 |
| Whitehorse Crossfit Limited | Arts & recreation | 2017 |
| Whitehorse Wiltshire Ltd | Professional & scientific | 2014 |
| Widmoor Limited | Administrative & support | 2011 |
| Wild Inks Limited | Professional & scientific | 2015 |
| Wild Wood Collective Ltd | Professional & scientific | 2025 |
| Wilkins and Partners Ltd | Real estate | 2023 |
| Will Stone Historic Cars Ltd | Other services | 2013 |
| William Bartholomew Party Organising Limited | Other services | 1988 |