| True Fusionz Ltd | Hospitality | 2025 |
| Truecurrent Ltd | Construction | 2025 |
| TSA Enterprises Ltd | Health & social care | 2009 |
| Tsafet Limited | Manufacturing | 2018 |
| TTA Relocation Management Consulting Limited | Real estate | 2002 |
| Ttmcn Ltd | Other services | 2026 |
| Tudor Oak Developments Limited | Construction | 2017 |
| Tulip Tree Court Freehold Limited | Households | 1998 |
| Tulip Tree Court Management Limited | Households | 1994 |
| Tutilight Ltd | Manufacturing | 2023 |
| TVD Investments Ltd | Real estate | 2021 |
| TVD Putney Ltd | Real estate | 2026 |
| Twin Digital Group Limited | Arts & recreation | 2024 |
| Twin Peaks Developments Limited | Construction | 2014 |
| Twinkle Touch Ltd | Administrative & support | 2023 |
| Two Brother's Cafe & Restaurant Ltd | Hospitality | 2020 |
| Txtured Limited | Professional & scientific | 2022 |
| TY Seren Ltd | Information & communication | 2018 |
| Tybourne Limited | Construction | 2013 |
| Tybourne Norwich Limited | Real estate | 2021 |
| Tyson-Gooden Ltd | Financial services | 2026 |
| U.S.Brass Footwear Ltd | Wholesale & retail | 2020 |
| UA Barbers Limited | Other services | 2022 |
| UBL Services Ltd | Construction | 2025 |
| Ugly Duckling Books Limited | Financial services | 2023 |
| Ujamuna Limited | Real estate | 2026 |
| UK and China Ltd | Information & communication | 2007 |
| UK Automation Forum Ltd | Other services | 2023 |
| UK Barns Ltd | Construction | 2025 |
| UK Dentplus Limited | Health & social care | 2020 |
| UK Facility Management Group Limited | Construction | 2024 |
| UK Facility Management Ltd | Construction | 2020 |
| UK Industrial Vision Association Limited | Other services | 1992 |
| UK Online Trading and Services Ltd | Wholesale & retail | 2012 |
| UK Truviv Ltd | Wholesale & retail | 2024 |
| Uk-Sino Guild Ltd. | Extraterritorial | 2014 |
| Ukprimedesign Ltd | Extraterritorial | 2017 |
| Ulliate Limited | Extraterritorial | 1969 |
| Ultra Care Support Ltd | Health & social care | 2023 |
| Ultrasound Sutton Ltd | Health & social care | 2021 |
| Ultravision Football Limited | Education | 2023 |
| UMA Motorfix Ltd | Wholesale & retail | 2021 |
| Under Mount Ltd | Education | 2020 |
| Underdog Cinema Limited | Administrative & support | 2024 |
| Undergrand Ltd | Real estate | 2002 |
| Underwater Music Limited | Information & communication | 2022 |
| Underwater Records Limited | Information & communication | 2022 |
| UNI Design Studio Limited | Professional & scientific | 2020 |
| UNI Investments U.K. Limited | Real estate | 2026 |
| UNI2U Academic Limited | Education | 2019 |
| Unify Services Limited | Information & communication | 2015 |
| Unique Phone Gadgets Ltd | Wholesale & retail | 2020 |
| Unique Roads Ltd | Transport & logistics | 2025 |
| Unique Thai Massage Wallington Ltd | Other services | 2024 |
| United Corporation Ltd. | Wholesale & retail | 1996 |
| United Vehicle Management Ltd | Administrative & support | 2021 |
| Universal Car Wash Ltd | Administrative & support | 2022 |
| Universal Centre for Mind Sciences and Alternative Therapies Ltd | Other services | 2015 |
| Universal Education Training Ltd | Education | 2025 |
| Universal Glass Systems Ltd | Construction | 2019 |
| Universe Lingoai Ltd | Information & communication | 2025 |
| Upath Limited | Education | 2026 |
| Uphive Limited | Administrative & support | 2020 |
| Upkeeping Properties Limited | Construction | 2020 |
| Uplift Studio Ltd | Other services | 2017 |
| UR London Trading Limited | Wholesale & retail | 2025 |
| Urban Rose London Limited | Wholesale & retail | 2020 |
| Urbanhaven Capital Limited | Real estate | 2024 |
| Urbexa Ltd | Wholesale & retail | 2026 |
| Uusports Ltd | Real estate | 2025 |
| UY & GA Limited | Hospitality | 2023 |
| V&C Swimming LLP | | 2024 |
| V2SAN UK Ltd | Real estate | 2024 |
| VA Fuels Ltd | Wholesale & retail | 2020 |
| Value Construction Limited | Real estate | 2002 |
| Vanguard Removals Logistics (VRL) Ltd | Transport & logistics | 2019 |
| Vantage (Sutton) Management Company Ltd. | Households | 2009 |
| Varaimata Ltd | Professional & scientific | 2022 |
| Vario Hearables Ltd | Health & social care | 2020 |
| Vario Link Ltd | Information & communication | 2025 |
| VB Exim Ltd | Wholesale & retail | 2020 |
| Velavan Ltd | Wholesale & retail | 2019 |
| Velolux Chauffeurs Limited | Transport & logistics | 2024 |
| Veltech Solutions Ltd | Wholesale & retail | 2011 |
| Venari Partners Limited | Administrative & support | 2014 |
| Venari Properties Ltd | Real estate | 2019 |
| Venator Fine Art Ltd | Wholesale & retail | 2014 |
| Vendifai Ltd | Information & communication | 2026 |
| Venus Beauty & Laser Clinic Ltd | Other services | 2019 |
| Verdant Vista Urban Limited | Other services | 2015 |
| Verde Design Collective Ltd | Professional & scientific | 2026 |
| Verdon Associates Limited | Health & social care | 2008 |
| Verlander Carpenter & Co Limited | Professional & scientific | 2025 |
| Verma Assets Limited | Real estate | 2026 |
| Verma Pharm Limited | Health & social care | 2014 |
| Vernon Barker Consultancy Limited | Professional & scientific | 2015 |
| Versa Health Ltd | Manufacturing | 2019 |
| Vertical Greening Systems Ltd | Other services | 2014 |
| Vexousia Billingham Limited | Energy | 2024 |
| VEY Construction Consulting Ltd | Professional & scientific | 2015 |