| THE Oak Bloke Landscaping Ltd | Administrative & support | 2023 |
| THE Orchard Huntspill Ltd | Hospitality | 2019 |
| THE Picnic Basket (Melksham) Limited | Hospitality | 2024 |
| THE Rebel Bites Events Ltd | Hospitality | 2025 |
| THE Rural Rise Limited | Professional & scientific | 2025 |
| THE Seend Club Limited | Hospitality | 2008 |
| THE Sleeper Limited | | 2000 |
| THE Tandoori 1984 Limited | Hospitality | 2023 |
| THE Way WE Were Ltd | Arts & recreation | 2025 |
| THE Whole House Company Limited | Administrative & support | 2009 |
| THE Woodbine Workshop Limited | Professional & scientific | 2017 |
| Think Coaching Limited | Professional & scientific | 2022 |
| Thirdberg Limited | Extraterritorial | 2015 |
| Thistle and Rose Consulting Limited | Professional & scientific | 2017 |
| Three Bears Bakes Limited | Hospitality | 2021 |
| Thyme Road Consulting Ltd | Professional & scientific | 2026 |
| Thymecot Consulting Limited | Professional & scientific | 2016 |
| Tide Partnership Ltd | Administrative & support | 2020 |
| Tikka G Ltd | Hospitality | 2023 |
| Timbertack Limited | Manufacturing | 2024 |
| TJ Media Ltd | Professional & scientific | 2021 |
| TJD Home Solutions Ltd | Construction | 2025 |
| TK Rentals Limited | Real estate | 2023 |
| TLC Governance Solutions Limited | Professional & scientific | 2025 |
| TOM COX Construction Solutions Ltd | Construction | 2023 |
| Top Cuts Barber Sadr Ltd | Other services | 2025 |
| Top Shelf Tools Ltd | Wholesale & retail | 2025 |
| Torte Ltd | Wholesale & retail | 2025 |
| Torva Ltd | Professional & scientific | 2022 |
| Total Carpets & Flooring Ltd | Other services | 2013 |
| Townsend Motors Limited | Wholesale & retail | 2003 |
| Toy Shop (Melksham) Limited | Wholesale & retail | 2017 |
| Tracy's Craft Shop Limited | Wholesale & retail | 2015 |
| Trailblazer Camper Van Hire Ltd | Transport & logistics | 2023 |
| Trefoil Properties Limited | Real estate | 2002 |
| Tressora Ltd | Other services | 2025 |
| Trevor Construction Limited | Construction | 2010 |
| Triple Ace Games Limited | Information & communication | 2012 |
| Truheat Heating and Plumbing Ltd | Construction | 2023 |
| Trumun Services Limited | Other services | 2003 |
| Turnpike Garage (Melksham) Limited | Wholesale & retail | 1977 |
| Twin Roads Ltd | Real estate | 2025 |
| Tyncliffe Finance Limited | Information & communication | 2023 |
| Tyre Curing Services Ltd | Professional & scientific | 2024 |
| UK Media Solutions Limited | Professional & scientific | 2013 |
| Ukes Rail Ltd | Manufacturing | 2010 |
| Ultronics NDT Ltd | Manufacturing | 2012 |
| Unite Brickwork Limited | Construction | 2021 |
| United Commerce Limited | Professional & scientific | 1998 |
| Urban Blossom Ltd | Professional & scientific | 2023 |
| VAE Drinks Ltd | Manufacturing | 2021 |
| Veenewed Projects Ltd | Construction | 2026 |
| Velint Limited | Information & communication | 2025 |
| Vempha Ltd | Professional & scientific | 2025 |
| Veterinary Concepts Europe Limited | Professional & scientific | 1990 |
| Vezer Management Limited | Professional & scientific | 2015 |
| Vherbalkitchen Ltd | Wholesale & retail | 2025 |
| Victorelo Limited | Transport & logistics | 2012 |
| Vintage Classics Limited | Administrative & support | 2003 |
| Vision Building and Developments (SW) Ltd | Construction | 2023 |
| VK Graphics Ltd | Professional & scientific | 2016 |
| Volterra Energy Limited | Construction | 2026 |
| Voxa Computer Services Ltd | Information & communication | 2013 |
| W & C Inventories Limited | Hospitality | 2020 |
| W&M Ltd | Construction | 2023 |
| W&M Property Group Ltd | Real estate | 2026 |
| W.J.Beaven Ltd | Wholesale & retail | 2011 |
| Walters & Daughters Developments Limited | Administrative & support | 2012 |
| Wananchi Melksham Ltd | Manufacturing | 2026 |
| Warathai Ltd | Hospitality | 2023 |
| Warwick Bailey Associates Limited | Professional & scientific | 2009 |
| Wateroak Ltd | Manufacturing | 2020 |
| Watkins Welding and Engineering Limited | Manufacturing | 2023 |
| Waxeem Rana Ltd | Wholesale & retail | 2025 |
| Wayne LEE Claridge Engineering and Vehicle Repairs Ltd | Wholesale & retail | 2012 |
| WCC Building Solutions Ltd | Construction | 2022 |
| WCF (Distribution) Limited | Wholesale & retail | 2023 |
| WCF (UK) Limited | Wholesale & retail | 2014 |
| Web by Numbers Ltd | Information & communication | 1991 |
| Webster Entertainment Ltd | Information & communication | 2022 |
| Weise Work Limited | Construction | 2019 |
| Wesley Services Ltd | Administrative & support | 2016 |
| Wessex Field and Game Ltd | Agriculture & fishing | 2023 |
| West Country Taverns Limited | Hospitality | 2008 |
| West Country Tree Services Limited | Administrative & support | 2015 |
| West END Mews (Melksham) Management Company Limited | Households | 2000 |
| Westbury Packaging Limited | Manufacturing | 1984 |
| Westek Technology Limited | Manufacturing | 1986 |
| Westernbrookes Healthcare Ltd | Health & social care | 2025 |
| Weston Manufacturing Co. Limited | Extraterritorial | 1988 |
| Whiterun Trading Ltd | Wholesale & retail | 2023 |
| Whitley Golf Club Limited | Arts & recreation | 2013 |
| William Pride Ltd | Construction | 2014 |
| Williams Investments Limited | Real estate | 2016 |
| Wiltbourne Limited | Information & communication | 2016 |
| Wiltshire Building Company Ltd | Construction | 2023 |
| Wiltshire Digital Drive CIC | Education | 2020 |
| Wiltshire Flat Roofing Ltd | Construction | 2025 |
| Wiltshire Flooring Ltd | Construction | 2024 |
| Wiltshire Gymnastics Limited | Arts & recreation | 1993 |