| Tone Valley Services Limited | Agriculture & fishing | 2012 |
| Tone Valley View Glamping Limited | Hospitality | 2025 |
| Topgroves Limited | Administrative & support | 2019 |
| Topstep Services Limited | Construction | 2024 |
| Torquay Investments Limited | Real estate | 2004 |
| Torwood Limited | Hospitality | 2016 |
| Tradestock Limited | Manufacturing | 2000 |
| Traditionelle Limited | Other services | 2010 |
| Tramp Tech Ltd | Arts & recreation | 2019 |
| Trauma Recovery Education Centre Ltd | Education | 2026 |
| Tree Top Carvings Limited | Wholesale & retail | 2014 |
| Trinity House 3 Ltd | Real estate | 2018 |
| Trioson Limited | Construction | 2014 |
| Trottco Limited | Financial services | 2020 |
| Truly Intelligent Business Ltd | Information & communication | 2010 |
| TS Grants Ltd | Financial services | 2026 |
| TS Partners Ltd | Professional & scientific | 2018 |
| TS Professional Services Ltd | Professional & scientific | 2024 |
| TS Specialist Tax Services Ltd | Professional & scientific | 2018 |
| Tutoring and Assessing Services Ltd | Education | 2020 |
| Two Bald Blokes Limited | Administrative & support | 2008 |
| Two Sisters Afro Pantry Ltd | Wholesale & retail | 2025 |
| Twotides Ltd | Wholesale & retail | 2026 |
| UK Asbestos Ltd | Water & waste | 2025 |
| UK Converting Limited | Professional & scientific | 2008 |
| UK Pizza Ventures Limited | Hospitality | 2026 |
| Ukwebs Affiliates Limited | Information & communication | 2009 |
| Ukwebs Invest Limited | Real estate | 2011 |
| Ukwebs Limited | Extraterritorial | 2007 |
| Unique Homes NO 2 Limited | Construction | 2010 |
| Unique Homes SW Holdings Limited | Real estate | 2010 |
| Unique Homes SW Limited | Construction | 2003 |
| Unit 1 Riverside Ltd | Hospitality | 2019 |
| Used Tech Limited | Water & waste | 2019 |
| Vale Labels Limited | Manufacturing | 2003 |
| Valke Limited | Wholesale & retail | 2003 |
| Vegantoyou Ltd | Hospitality | 2018 |
| Verde Hair Lounge Ltd | Other services | 2025 |
| Vessey Limited | Professional & scientific | 2012 |
| VET & Physio Ltd | Professional & scientific | 2018 |
| Veve Limited | Hospitality | 2018 |
| Vibest Limited | Financial services | 2023 |
| Vida Financial Solutions Limited | Professional & scientific | 2021 |
| Villa Verde ST Ltd | Hospitality | 2021 |
| Vincent Property Developments Limited | Construction | 1999 |
| Vitruvian Ventures Ltd | Real estate | 2016 |
| VX Systems Ltd | Information & communication | 2019 |
| W S Spice Ltd | Hospitality | 2023 |
| Wagify Ltd | Information & communication | 2026 |
| Walronds Financial Limited | Financial services | 2021 |
| Walter Hill (Beech House) Limited | Construction | 1960 |
| Walter Hill (Properties) Limited | Real estate | 1965 |
| Walter Manny Limited | Health & social care | 2012 |
| Wangee Healthcare Ltd | Health & social care | 2022 |
| Water Safe Africa Ltd | Water & waste | 2022 |
| Watkin Law Ltd | Professional & scientific | 2024 |
| Wayholy Limited | Administrative & support | 2022 |
| Wearekombucha Limited | Manufacturing | 2019 |
| Weather Gods Ltd | Information & communication | 2018 |
| Weatherbeater Contractors Ltd | Construction | 2005 |
| Wefix East London Ltd | Manufacturing | 2025 |
| Wefix North London Ltd | Manufacturing | 2025 |
| Wefix South London Ltd | Manufacturing | 2025 |
| Wefix West London Ltd | Manufacturing | 2025 |
| Wefix Westminster Ltd | Manufacturing | 2025 |
| Wellesley Holdings (Wellington) Ltd | Financial services | 2024 |
| Wellington (Somerset) & District Arts Association | Arts & recreation | 2003 |
| Wellington Autofix Ltd | Wholesale & retail | 2020 |
| Wellington Lion Management Limited | Administrative & support | 2009 |
| Wellington MOT and Service Centre Ltd | Wholesale & retail | 2020 |
| Wellington Nails & Spa Ltd | Other services | 2026 |
| Wellington Orient Limited | Hospitality | 2025 |
| Wellington Pantry CIC | Hospitality | 2024 |
| Wellington Scaffolding Limited | Construction | 2012 |
| Wellington School 1837 | Education | 2014 |
| Wellington School International Ltd | Education | 2022 |
| Wellington Self Storage Limited | Extraterritorial | 2006 |
| Wellington Timber Company Limited | Manufacturing | 1985 |
| Wellington Women in Business Community Interest Company | Education | 2025 |
| Wellington Woodworks Ltd | Manufacturing | 2024 |
| Wellshead Sporting Club Ltd | Arts & recreation | 2013 |
| West Buckland Bloodstock Ltd | Agriculture & fishing | 2014 |
| West Buckland Hire Limited | Transport & logistics | 2022 |
| Wester Social Ltd | Professional & scientific | 2019 |
| Westgate House (Ironbridge) Management Limited | Households | 1981 |
| Westward Joinery Limited | Construction | 2003 |
| Wheathill Ltd | Agriculture & fishing | 2012 |
| Whirlwinds Academy Ltd | Arts & recreation | 2020 |
| White Hart Maintenance Limited | Households | 2022 |
| White Post Enterprises Limited | Administrative & support | 1999 |
| Whiteball Ltd | Professional & scientific | 2018 |
| Whitepost Cafe Ltd | Hospitality | 2022 |
| Whoop Creative Ltd | Professional & scientific | 2016 |
| Wick Farm Contracting Limited | Agriculture & fishing | 2012 |
| Wilbraham ND Limited | Wholesale & retail | 2026 |
| Wild Minds South West CIC | Health & social care | 2026 |
| Willand Services Limited | Wholesale & retail | 2020 |
| William Abbott Developments Ltd | Construction | 2017 |
| William Abbott Holdings Ltd | Real estate | 2017 |
| William Abbott Land Ltd | Construction | 2023 |