| THE Somerset Grill Company Ltd | Manufacturing | 2018 |
| THE Sustainable Environment Company CIC | Professional & scientific | 2006 |
| THE Toy Box (Yeovil) Limited | Health & social care | 2003 |
| THE Unifire Group Limited | Financial services | 2025 |
| THE Unity Club (Street) Limited | Hospitality | 1922 |
| THE Valley Smokehouse Limited | Manufacturing | 2003 |
| THE Water Shop Limited | Manufacturing | 2004 |
| Thermaglaze Windows & Conservatories Limited | Construction | 2004 |
| Thirdeye Business Vision Limited | Professional & scientific | 2002 |
| Thorn Cycles Limited | Manufacturing | 2000 |
| Thornemead Limited | Construction | 2003 |
| Thoughtgraph Ltd. | Information & communication | 2006 |
| Three Cliffs Bay Ltd | Hospitality | 2021 |
| Three Ways Fire Prevention Services Limited | Administrative & support | 2003 |
| Tile Wise Limited | Construction | 1995 |
| Timco Designs Limited | Agriculture & fishing | 1972 |
| Time Back Accounts & Payroll Ltd | Professional & scientific | 2002 |
| Tony Cinicola Limited | Construction | 2006 |
| Tony.D Productions Ltd. | Information & communication | 2015 |
| Top Spread Plastering Ltd | Construction | 2026 |
| TOR Stone Limited | Wholesale & retail | 2007 |
| Toroce Limited Partnership | | 2005 |
| Toucan Wholefoods Limited | Wholesale & retail | 2005 |
| Tradebridgeiq Ltd | Information & communication | 2025 |
| Travelsmart Ltd | Information & communication | 2003 |
| TSP Trustees Limited | Administrative & support | 2024 |
| Tuckers Takeaway Limited | Hospitality | 2003 |
| Tudorbell Limited | Professional & scientific | 1986 |
| Tweedie Evans Consulting Limited | Professional & scientific | 2004 |
| Twenty Green Park (Bath) Management Company Limited | Households | 1983 |
| Twin Column Holdings Limited | | 1974 |
| Twist Flooring Limited | Wholesale & retail | 2000 |
| Tylers Farm Limited | Agriculture & fishing | 2021 |
| Tyre Renewals Limited | Manufacturing | 1967 |
| UK Epson International Chemical Co., Ltd | Extraterritorial | 2023 |
| UK Fashida Petrochemical Science and Technology Co., Ltd | Wholesale & retail | 2020 |
| Uphill & SON Limited | Wholesale & retail | 1957 |
| Uphill Building Contractors Limited | Construction | 2000 |
| V.J. Coyle (Building Contractors) Limited | | 1975 |
| Valvcan Limited | | 1975 |
| Vanguard Film and Television Location Security Limited | Administrative & support | 1998 |
| Vehicle Solutions (South West) Limited | Professional & scientific | 2003 |
| Venta Mina Holdings Ltd | Financial services | 2022 |
| Verhoef Training Limited | Information & communication | 1994 |
| Veric Construction Company Limited | Wholesale & retail | 1963 |
| Vertex Accelerate Limited | Administrative & support | 2022 |
| Virtual Freedom Academy Limited | Professional & scientific | 2019 |
| VMS Online Limited | Professional & scientific | 2003 |
| VMW Bookkeeping Ltd | Professional & scientific | 2026 |
| W C Maunders Limited | Wholesale & retail | 1952 |
| W H Adams & Sons (Construction) Ltd. | Administrative & support | 2008 |
| W Hansford Limited | Professional & scientific | 2003 |
| W. Gadsby and SON Limited | Manufacturing | 1954 |
| Wadman Brothers Limited | Wholesale & retail | 1983 |
| Walter Wall Carpets Limited | Wholesale & retail | 2001 |
| Ward & Sibley Limited | Administrative & support | 1951 |
| Warren Property Management Limited | Real estate | 1995 |
| Watchet Web Design Ltd | Information & communication | 2011 |
| Waterfall Cafe & Ice Creams Ltd | Hospitality | 2005 |
| Watersmeet Hotel Limited(The) | Hospitality | 1949 |
| Watkins & Tasker Veterinary Group | | 2002 |
| Wave Optronics Limited | Manufacturing | 2007 |
| Web Air Conditioning Limited | Wholesale & retail | 1996 |
| Webb & Co Ltd | Professional & scientific | 2004 |
| Webb's Property Lettings Limited | Real estate | 2003 |
| Webber Precision Engineering Limited | Manufacturing | 1990 |
| Wellington International Study Centre Limited | Education | 2005 |
| Wellington School (Somerset) Trading Company Limited | Education | 1995 |
| Wells Cargo Limited | Construction | 2006 |
| Wells Estates Limited | Construction | 1983 |
| Wells Violins Ltd. | Wholesale & retail | 2001 |
| Wellscope Ltd | Wholesale & retail | 1998 |
| Wessex Footwear Limited | Manufacturing | 2000 |
| West Coast Leisure Limited | | 1981 |
| West Country Business Machines Limited | Extraterritorial | 1991 |
| West Country Conservatories Limited | Professional & scientific | 1991 |
| West Country Telecommunications Limited | Information & communication | 2001 |
| West Country Windows (Double Glazing) Limited | Construction | 1977 |
| West END House Management Limited | Real estate | 2006 |
| West Somerset Railway Public Limited Company | Transport & logistics | 1971 |
| Westcorn Enviro Waste Ltd | Water & waste | 2007 |
| Western Cleaning Services (Cardiff) Ltd | | 1990 |
| Western Cleaning Services Limited | | 1986 |
| Western Court (Somerset) Limited | Households | 1986 |
| Western Loft Conversions Limited | | 1981 |
| Westland Transmissions Limited | Extraterritorial | 1959 |
| Weston Super Frames Limited | Wholesale & retail | 2006 |
| White & Green Mead Freeholders Limited | Households | 2000 |
| White Hart Company Ltd | Construction | 2019 |
| White Line Coaching Limited | Other services | 2023 |
| Whytech-It Ltd. | Information & communication | 2018 |
| William Sparrow Limited | Manufacturing | 1906 |
| Williamson Structural Design Limited | Professional & scientific | 2007 |
| Willis Wakefield Limited | Administrative & support | 2002 |
| Williton Mobility Services Limited | Transport & logistics | 2005 |
| Willowgreen Properties Limited | Real estate | 2005 |
| Wilsons Commercial Limited | Real estate | 2023 |
| Wimborne Services Limited | Real estate | 1979 |
| Woodland's Retreats Limited | Real estate | 2007 |
| Woodleys Plumbing & Heating Contractors Limited | Construction | 2006 |