| THE Race Shed Ltd | Transport & logistics | 2026 |
| THE Rail Clamp Company Limited | Manufacturing | 2021 |
| THE RAJ (Chippenham) Ltd | Hospitality | 2011 |
| THE Rectory Lacock Ltd | Hospitality | 2017 |
| THE Reme Charity | Public administration | 2016 |
| THE Ring Shop Limited | Extraterritorial | 2002 |
| THE Rise Trust | Other services | 2005 |
| THE Salon Chippenham Limited | Other services | 2006 |
| THE Sandpiper Group Ltd | Administrative & support | 2022 |
| THE Secret Hideout Limited | Hospitality | 2020 |
| THE Send Partnership Ltd | Public administration | 2025 |
| THE Shearings Management Company Limited | Households | 2022 |
| THE SIX Bells of Colerne Ltd | Real estate | 2020 |
| THE Slate Backwell Ltd | Administrative & support | 2004 |
| THE Smithfield Collective Limited | Professional & scientific | 2018 |
| THE Smithy Clinic Limited | Health & social care | 2003 |
| THE Social Muse Ltd. | Professional & scientific | 2025 |
| THE Space to Move Studios Ltd | Other services | 2024 |
| THE Spring Cleaners (South West) Limited | Administrative & support | 2010 |
| THE SRX Club Limited | Arts & recreation | 2024 |
| THE Studio Barn Limited | Other services | 2024 |
| THE Tax Return Expert Ltd | Professional & scientific | 2025 |
| THE Tetbury Flower Company Ltd | Wholesale & retail | 2022 |
| THE Therapeutic Media Company Ltd | Information & communication | 2012 |
| THE Toy Moon Ltd | Wholesale & retail | 2020 |
| THE Trade Loft Ltd | Wholesale & retail | 2025 |
| THE Upvc Spraying Company (South) Limited | Construction | 2019 |
| THE Utility Market Experts Ltd | Professional & scientific | 2017 |
| THE Village Cafe (Larkhall) Ltd | Hospitality | 2024 |
| THE Waste Connect Ltd | Water & waste | 2020 |
| THE Water Softener Company Limited | Wholesale & retail | 2015 |
| THE Wellness Shed Ltd | Arts & recreation | 2026 |
| THE West Indies Sugar and Trading Company UK Limited | Wholesale & retail | 2006 |
| THE Wiggle BUM Company Limited | Wholesale & retail | 2024 |
| THE Wildink Workshop Limited | Extraterritorial | 2020 |
| THE Willow Tree Foundation CIC | Health & social care | 2025 |
| THE Woman in Green Ltd | Health & social care | 2019 |
| THE Woodago Company Limited | Hospitality | 2005 |
| THE Woods Group Limited | Administrative & support | 1998 |
| THE Wylye Group Ltd | Financial services | 2023 |
| THE Yoga Coffee Club Limited | Health & social care | 2022 |
| Thekitman.Co.Uk Ltd | Wholesale & retail | 2025 |
| Theo SZE Limited | Real estate | 2024 |
| Theseus Risk Management Ltd | Professional & scientific | 2018 |
| Thickwood Associates Limited | Professional & scientific | 2016 |
| Thin Air Limited | Wholesale & retail | 1994 |
| Thinee Limited | Transport & logistics | 2023 |
| Third Millennium Press Limited | Manufacturing | 1997 |
| Thirlwell Independent Financial Advice Ltd | Financial services | 2025 |
| Thomas of Calne Limited | Wholesale & retail | 1951 |
| Thomas Somerset Ltd | Other services | 2016 |
| Thompson Leisure Creations Ltd | Hospitality | 2023 |
| Thorn Equipment Ltd | Wholesale & retail | 2026 |
| Thornbury Surfacing (Chippenham) Limited | Construction | 2000 |
| Thornend Consultancy Ltd | Professional & scientific | 2020 |
| Three Pigs Properties Ltd | Real estate | 2022 |
| Three Putt Life Limited | Information & communication | 2023 |
| Three-Ev Ltd | Construction | 2024 |
| Thrive Health Collective Ltd | Health & social care | 2026 |
| Thrive Psychology Ltd | Health & social care | 2024 |
| Thrive to Grow Ltd | Administrative & support | 2025 |
| Thrs Consulting Ltd | Information & communication | 2025 |
| THS Consulting Limited | Professional & scientific | 2022 |
| Thurston Court Limited | Professional & scientific | 1981 |
| Tickle My TUM Dogs Ltd | Other services | 2016 |
| Ticknall Consulting Ltd | Professional & scientific | 2025 |
| Tiling Supplies Direct Ltd | Wholesale & retail | 2019 |
| Tiller London Ltd | Administrative & support | 2015 |
| Tilton Holdings Limited | Administrative & support | 1947 |
| Timber & Moss Ltd | Wholesale & retail | 2025 |
| Timberglaze Ltd | Manufacturing | 2018 |
| Time Tourist Ltd | Information & communication | 2025 |
| Times Square Trowbridge (Cpmc) Limited | Households | 2022 |
| Times Square Trowbridge (FMC) Limited | Households | 2022 |
| Tinc Ltd | Wholesale & retail | 2010 |
| Tiphive Limited | | 1987 |
| Tivital Limited | Information & communication | 2016 |
| TJ E Contracting Ltd | Agriculture & fishing | 2024 |
| TJC Electrical Limited | Construction | 2009 |
| Tjdcb Holdings Limited | Financial services | 2017 |
| TJL Designs Limited | Information & communication | 2018 |
| TK. Electrical South West Limited | Construction | 2023 |
| TK3N Consulting Ltd | Professional & scientific | 2025 |
| TK9 SS Limited | Administrative & support | 2019 |
| TKD Schools Ltd | Arts & recreation | 2014 |
| TM Trading (Wiltshire) Limited | Wholesale & retail | 2013 |
| Tmax Engines Limited | Manufacturing | 2015 |
| TMW Associates Ltd | Professional & scientific | 2023 |
| TNP Grounds Maintenance Limited | Administrative & support | 2024 |
| TNS Groundworks Ltd | Administrative & support | 2022 |
| TNT Roofing Ltd | Construction | 2025 |
| Toby Martin Consultancy & Training Limited | Professional & scientific | 2026 |
| Toby's Tail Ltd | Other services | 2020 |
| Todd Heal Ltd | Wholesale & retail | 2026 |
| Toddle & Play Limited | Manufacturing | 2024 |
| Togethia Limited | Information & communication | 2006 |
| Tolward Limited | Information & communication | 1989 |
| TOM Doyle Limited | Construction | 2007 |
| Tono Resources Limited | Professional & scientific | 2018 |
| Top Line 030784 Limited | Construction | 2007 |