| TPM Solution Ltd | Information & communication | 2019 |
| Trade Data Monitor Limited | Professional & scientific | 2022 |
| Tranmere Kraft Brewing Ltd | Manufacturing | 2024 |
| Transport Resource Services Limited | Transport & logistics | 2011 |
| Transport Resource Solutions Limited | Transport & logistics | 2024 |
| Trapezium Security Limited | Information & communication | 2013 |
| Treasures and Treats Limited | Wholesale & retail | 2006 |
| Triceratops Creative Enterprises Limited | Information & communication | 2013 |
| Tridac Dental Equipment Limited | Extraterritorial | 1978 |
| Tridac Fabrications Limited | Extraterritorial | 1972 |
| Tridac Limited | Manufacturing | 1969 |
| Trident Trading Ltd | Wholesale & retail | 2019 |
| Triple Smith Investments Limited | Real estate | 2020 |
| Trueland Limited | Administrative & support | 1982 |
| TSP Associates Ltd | Professional & scientific | 2022 |
| Tukdah Limited | Professional & scientific | 2023 |
| Turk Transport (UK) Limited | Transport & logistics | 2000 |
| Turner & Dimarca Ltd | Information & communication | 2025 |
| Turning Point for GOD of Great Britain | Other services | 2007 |
| TV2U Gaming Limited | Arts & recreation | 2015 |
| TW Cars Ltd | Wholesale & retail | 2016 |
| Twelve Ronnies Ltd | Other services | 2017 |
| Twixretail Ltd | Wholesale & retail | 2018 |
| TWR Limited | Manufacturing | 2004 |
| Txeya Limited | Information & communication | 2021 |
| Tyler Fairwater Ltd | Construction | 2026 |
| U and Health Ltd | Other services | 2013 |
| U.K. Nationwide Security Services Limited | Professional & scientific | 2001 |
| Udathu Group Limited | Information & communication | 2023 |
| Ugoku Projects Limited | Wholesale & retail | 2021 |
| Uideveloper Ltd | Professional & scientific | 2024 |
| UK HAN Kebab Ltd | Hospitality | 2024 |
| UK Retsol Ltd | Wholesale & retail | 2024 |
| Ukvicas Limited | Information & communication | 2023 |
| Unicol Services Limited | Information & communication | 2015 |
| United Property Corporation Limited | Extraterritorial | 1996 |
| Unity Heritage Collective Ltd | Administrative & support | 2025 |
| Unreal City Audio Limited Partnership | | 2016 |
| Untimed Limited | Professional & scientific | 2023 |
| Urban Media UK Limited | Professional & scientific | 2007 |
| Urban Rules Limited | Construction | 2016 |
| Urbandrift Ltd | Wholesale & retail | 2024 |
| Urmil Shah Limited | Professional & scientific | 2024 |
| Uropaedia.Org Ltd | Education | 2018 |
| Utilities Research 2 Limited | Real estate | 2026 |
| Utilities Research 3 Limited | Real estate | 2026 |
| Utilities Research Limited | Real estate | 1987 |
| V+V Interni Ltd | Professional & scientific | 2007 |
| Vaab Property Ltd | Real estate | 2025 |
| Vakratund Enterprises Ltd | Wholesale & retail | 2021 |
| Valik Limited | Other services | 2025 |
| Vallon Strategies Limited | Professional & scientific | 2023 |
| Value Vest Limited | Information & communication | 2025 |
| Valueedgeone Ltd | Information & communication | 2026 |
| Vantage London Limited | Professional & scientific | 2008 |
| Vardi Properties Ltd | Real estate | 2021 |
| Variety Thriving Ltd | Professional & scientific | 2024 |
| Varojay Ltd | Real estate | 2023 |
| Vartec Solutions Limited | Information & communication | 2016 |
| VBS Capital Ltd | Financial services | 2017 |
| Veer Assets Limited | Real estate | 2024 |
| Veer Dhara Harpenden Ltd | Hospitality | 2025 |
| Venarc Properties Ltd | Real estate | 2020 |
| Ventura Law Limited | Professional & scientific | 2002 |
| Venus Technology Solutions Limited | Information & communication | 2011 |
| Vera Partners Limited | Professional & scientific | 2021 |
| Veritas Time Consulting Limited | Professional & scientific | 2025 |
| Verity Investments Limited | Real estate | 2016 |
| Vero Enterprises Limited | Information & communication | 2026 |
| Vesta Staging Ltd | Wholesale & retail | 2024 |
| Vevie Limited | Wholesale & retail | 2004 |
| Viaphone Limited | Professional & scientific | 2013 |
| Vidvai Limited | Information & communication | 2023 |
| View 2 Care Limited | Professional & scientific | 2010 |
| Vigireg Consulting Ltd | Professional & scientific | 2011 |
| Village Way Management Company Limited | Households | 2024 |
| Vinarchsel Limited | Information & communication | 2007 |
| Violet Hill Property Limited | Households | 2024 |
| Viper Fish Ltd | Other services | 2014 |
| Vitae Developments Limited | Real estate | 2017 |
| Vitamin C Consulting Ltd | Administrative & support | 2017 |
| Vitrx Group Limited | Professional & scientific | 2024 |
| Vitrx Limited | Administrative & support | 2010 |
| VKR Global Foods Ltd | Wholesale & retail | 2025 |
| Vkytech Ltd | Information & communication | 2020 |
| Vladatwork Co Ltd | Education | 2021 |
| Vnat Business Solutions Ltd | Information & communication | 2016 |
| Volpe and Lupo Ltd | Professional & scientific | 2023 |
| Voomaa Ltd | Hospitality | 2025 |
| Vooty Amersham Ltd | Hospitality | 2023 |
| VRD Networkers Limited | Information & communication | 2012 |
| Vrish Consultancy Services Ltd | Professional & scientific | 2012 |
| VSK Health Care Consultancy Ltd | Health & social care | 2019 |
| VSV Properties Ltd | Construction | 2022 |
| W. Saunders Transport Garage Limited | Administrative & support | 1984 |
| W12 Electrical Ltd | Construction | 2020 |
| Waddington-Smith Management Ltd | Professional & scientific | 2023 |
| Wagon Wheels on Location Ltd | Transport & logistics | 2006 |
| Walk Your Path Ltd | Professional & scientific | 2025 |
| Walker Tuition Ltd | Education | 2020 |