| Tufnell Properties Limited | Real estate | 2024 |
| Tula Stripes Ltd | Wholesale & retail | 2025 |
| Tunbridge Jones Limited | Real estate | 1950 |
| TWD Dean Limited | Arts & recreation | 2021 |
| Twenty Nine Development Ltd | Real estate | 2024 |
| Twixis Ventures Ltd | Professional & scientific | 2011 |
| Two Five One Holdings Limited | Real estate | 2026 |
| Two Props SPV Ltd | Real estate | 2020 |
| Twocars Limited | Financial services | 2022 |
| U R Recycling Solutions Limited | Water & waste | 2023 |
| UA Consultants Ltd | Professional & scientific | 2014 |
| Ufulu Malawi Ltd | Other services | 2019 |
| UK AHA Moments Ltd | Information & communication | 2024 |
| UK Retention Services Limited | Administrative & support | 2025 |
| Ulift Ltd | Manufacturing | 2025 |
| Ultimate Earth Limited | Professional & scientific | 2014 |
| Ultimate Overtake Limited | Professional & scientific | 2024 |
| Underdog TV & Film Ltd | Arts & recreation | 2018 |
| Unearthed Search Limited | Administrative & support | 2024 |
| UNF LLP | | 2024 |
| Unit Five Ltd | Information & communication | 2016 |
| United Resource Management Ltd | Other services | 2014 |
| United Travel Study Service (U.K.) Limited | Education | 1989 |
| Unspoken Worlds Ltd. | Information & communication | 2024 |
| Uppal Fish & Chips Ltd | Hospitality | 2015 |
| Upper Thames Fuels Limited | Wholesale & retail | 2022 |
| Upton Wood Flooring Limited | Construction | 2013 |
| Urban Innovation Network Ltd | Information & communication | 2014 |
| Uright Limited | Transport & logistics | 2024 |
| Urry Services Ltd | Professional & scientific | 2009 |
| Utopian Game Labs Academy Ltd | Education | 2020 |
| Utopian Game Labs Ltd | Information & communication | 2018 |
| Uvuu.Me Limited | Information & communication | 2011 |
| VAG Technik Ltd | Wholesale & retail | 2010 |
| Valeglade Limited | Administrative & support | 2001 |
| Valentino Nails Ltd | Other services | 2017 |
| Valkyrie Events Ltd | Arts & recreation | 2025 |
| Valley Events Ltd | Hospitality | 2011 |
| Vanguard (UK) Ltd | Information & communication | 2014 |
| Vapour Flow Limited | Manufacturing | 2003 |
| Varsity Place Management Company Limited | Real estate | 1995 |
| Vaughan Plant Haulage Limited | Transport & logistics | 2008 |
| Vediacom Limited | Administrative & support | 2016 |
| Venalia Solutions Ltd | Information & communication | 2023 |
| Verallo Advisory LLP | | 2010 |
| Verallo FX Limited | Administrative & support | 2023 |
| Verallo Group Limited | Professional & scientific | 2018 |
| Verallo Limited | Extraterritorial | 2023 |
| Verallo Wealth Limited | Extraterritorial | 2021 |
| Vertisky Limited | Wholesale & retail | 2024 |
| Vesta Financial Solutions Limited | Financial services | 2025 |
| Vicarage Gate SPV Limited | Real estate | 2020 |
| Vicky Marsh Ltd | Professional & scientific | 2024 |
| Victoria Advisors Ltd | Professional & scientific | 2022 |
| Victoria Bidco Limited | Financial services | 2021 |
| Victoria Leigh Properties Ltd | Real estate | 2019 |
| Videcom Travel Systems Limited | Information & communication | 2005 |
| Vieve Media Ltd | Information & communication | 2026 |
| Vikingar Limited | Transport & logistics | 2009 |
| Vineconnect Services Limited | Agriculture & fishing | 2026 |
| Vipets Ltd | Agriculture & fishing | 2021 |
| Viresco Investments Limited | Professional & scientific | 2021 |
| Virtual Closers IO Limited | Administrative & support | 2017 |
| Virtuous Property Ltd | Real estate | 2025 |
| Visiproperties Limited | Information & communication | 2025 |
| Vitclear Limited | Wholesale & retail | 2024 |
| Viv's Cafe Ltd | Hospitality | 2024 |
| Vivid Consulting Limited | Information & communication | 2007 |
| Vizola Ltd | Information & communication | 2013 |
| Volt Back Office Solutions Ltd | Professional & scientific | 2021 |
| Volume (Europe) Ltd | Professional & scientific | 2018 |
| Vvpmedia Ltd | Information & communication | 2023 |
| W J Webb & SON Limited | Construction | 2008 |
| W&S Property Group Ltd | Real estate | 2025 |
| Wacnet Limited | Transport & logistics | 1998 |
| Wacpack UK Limited | Transport & logistics | 2016 |
| Waitaha Tech Limited | Professional & scientific | 2022 |
| Waldo Heavy Industries Limited | Financial services | 2019 |
| Wallingford Glazing & Window Centre Limited | Manufacturing | 2015 |
| Wanbourne Estates Limited | Real estate | 2023 |
| Wargames Research Group Limited | Information & communication | 2009 |
| Warren Farm (Horwood) Management Company (NO. 1) Limited | Households | 2003 |
| Warren Farm (Horwood) Management Company (NO.2) Limited | Households | 2003 |
| Warwick Bromley Digital Design Ltd | Information & communication | 2018 |
| Watan Money Transfer Limited | Financial services | 2025 |
| Water Resource Associates LLP | | 2012 |
| Waterfront Hospitality Ltd | Hospitality | 2020 |
| Watersports Broadcasting Corporation International Limited | Information & communication | 2025 |
| Watlington Park Holdings Ltd | Real estate | 2023 |
| Watlington Park Limited | Agriculture & fishing | 2020 |
| Wayforward Consulting Limited | Information & communication | 2025 |
| WE Dissent Limited | Information & communication | 2023 |
| WE Drive Smart Limited | Transport & logistics | 2019 |
| Weatherby Education Studies Limited | Education | 2017 |
| WEL Group Consulting Ltd | Professional & scientific | 2015 |
| Well BE IT Ltd | Professional & scientific | 2020 |
| Wellmark Customs and Logistics Ltd | Transport & logistics | 2017 |
| Wellsician.Io Ltd | Education | 2024 |
| Wendover Rise Management Company (Phases 2 and 3) Limited | Households | 2010 |
| West Central (Slough) Management Company Ltd | Households | 2014 |