| Transit Tools (Alton) Limited | Wholesale & retail | 2009 |
| Treatdropco Ltd | Wholesale & retail | 2026 |
| Tregella Estate Management Company Limited | Real estate | 2001 |
| Treloar Enterprises Limited | Construction | 1993 |
| Treloar Trust | Education | 2002 |
| Trident Sustainable Fuels Ltd | Manufacturing | 2021 |
| Trident Window Cleaning Ltd | Administrative & support | 2024 |
| Tridex Global Limited | Administrative & support | 2017 |
| Trillium Search Ltd | Administrative & support | 2025 |
| Trinity 2010 Limited | Households | 2010 |
| Trio Logistics Limited | Transport & logistics | 2009 |
| Trio Storage Ltd | Transport & logistics | 2022 |
| Trisco Group Ltd | Real estate | 2022 |
| Troncmaster Solutions Limited | Administrative & support | 2024 |
| Trpl C Limited | Information & communication | 2025 |
| Trpm Ltd | Water & waste | 2026 |
| TRT Global Limited | Manufacturing | 2023 |
| Truck and Van Hire Limited | Administrative & support | 2024 |
| True Edge Agency Ltd | Administrative & support | 2025 |
| True Edge Enterprises Ltd | Administrative & support | 2026 |
| True Edge Limited | Other services | 2018 |
| Truro (T) Hairdressing Limited | Other services | 2016 |
| TSC Partners Limited | Professional & scientific | 2022 |
| Tulip Cube Limited | Information & communication | 2010 |
| Tungate Capital PLC | Financial services | 2016 |
| Tuning 4 Performance Limited | Wholesale & retail | 2018 |
| Turbojet Performance Solutions Limited | Manufacturing | 2018 |
| Turk Street Properties Limited | Real estate | 2025 |
| Turning Leaves Autobiographies Ltd | Information & communication | 2024 |
| Turrel Limited | Wholesale & retail | 2016 |
| Turtle Canyon Media Limited | Information & communication | 2008 |
| Twenty Point Seven Limited | Arts & recreation | 2020 |
| TWG Racing Limited | Professional & scientific | 2013 |
| TWM Clarke Limited | Financial services | 2025 |
| TWM Medical Services Ltd | Other services | 2017 |
| TWO-40 Ltd | Manufacturing | 2024 |
| Tynemouth Cadrive Ltd | Administrative & support | 2024 |
| Typhon Consulting Limited | Information & communication | 2022 |
| UB Farm Limited | Agriculture & fishing | 2024 |
| Ubiquitous Holdings (UK) Ltd | Financial services | 2010 |
| Udlive Limited | Manufacturing | 2017 |
| UK & ZA Limited | Financial services | 2020 |
| UK Coin Co (Alton) Ltd | Wholesale & retail | 2017 |
| UK EPC Ltd | Information & communication | 2016 |
| UK Sourcing Services Ltd | Professional & scientific | 2024 |
| Uk-India Centre Ltd | Information & communication | 2018 |
| UKO Shipping Ltd | Transport & logistics | 2012 |
| Ukse Group Holdings Limited | Professional & scientific | 2016 |
| Ukse Group Limited | Professional & scientific | 2016 |
| Unicorns R US Limited | Financial services | 2016 |
| Universal Marking Systems Limited | Manufacturing | 1963 |
| UPL Limited | Real estate | 2002 |
| Urban Aesthetics Ltd | Information & communication | 2014 |
| Urban Properties DC Limited | Professional & scientific | 2006 |
| Urbangreen ADM Limited | Construction | 2015 |
| Ursa Majoris Consultancy Ltd | Information & communication | 2018 |
| Utrecht Consultancy Ltd | Professional & scientific | 2020 |
| UVA Management Limited | Administrative & support | 2005 |
| UVE Digital Ltd | Administrative & support | 2023 |
| Uvia Limited | Wholesale & retail | 2025 |
| Uwitness Ltd. | Information & communication | 2023 |
| UWL Associates Limited | Professional & scientific | 2018 |
| V Munyaradzi Ltd | Health & social care | 2019 |
| V3 Aviation Limited | Professional & scientific | 2016 |
| Vaag Limited | Administrative & support | 2026 |
| Van Hagen Consulting Limited | Information & communication | 2017 |
| Vasco Sousa Marques Ltd | Transport & logistics | 2018 |
| Vass Automotive Ltd | Wholesale & retail | 2021 |
| Vault Origin Holdings Ltd | Information & communication | 2026 |
| VBL Hospitality Ltd | Hospitality | 2021 |
| VDP Capital Limited | Professional & scientific | 2024 |
| Vedra Investments Limited | Real estate | 2013 |
| VEE Z VEE Limited | Extraterritorial | 2011 |
| Veibelson Limited | Education | 2003 |
| Ventrus Networks Limited | Information & communication | 2008 |
| VENUE78E Limited | Hospitality | 2026 |
| VF Holdings (2023) Ltd | Wholesale & retail | 2023 |
| Vicarage Hill Freehold Company Limited | Households | 2008 |
| Victoria Farming Holdings Limited | Agriculture & fishing | 2005 |
| Victoria Langmead Farming Limited | Agriculture & fishing | 2005 |
| Video IP Limited | Administrative & support | 2002 |
| Videovista Ltd | Information & communication | 2025 |
| Vincent Hire Limited | Administrative & support | 2002 |
| Vine Consulting Engineers Limited | Professional & scientific | 2019 |
| Virtus SC Fire Engineering Ltd | Professional & scientific | 2023 |
| Vision Civils Systems Ltd | Wholesale & retail | 2023 |
| Visionex Limited | Information & communication | 2019 |
| Visionmp Ltd | Information & communication | 2022 |
| Vista Golf Limited | Professional & scientific | 2002 |
| Vistatec Ltd | Information & communication | 2009 |
| Visuri Designs Ltd | Professional & scientific | 2026 |
| Vitality Hub Limited | Health & social care | 2024 |
| Vitosha Wine Ltd | Manufacturing | 2019 |
| Vizability.Io Web Design LLP | | 2020 |
| Volando Limited | Professional & scientific | 2016 |
| Voltpoint Ltd | Construction | 2025 |
| Vooma Property Investments Limited | Real estate | 2003 |
| Voxxpress Limited | Professional & scientific | 2011 |
| VTA Retail Ltd | Wholesale & retail | 2022 |
| VVE Design Limited | Professional & scientific | 2016 |