| Trailblazing Wine Ltd | Wholesale & retail | 2015 |
| Tranquility Nails & Beauty Limited | Other services | 2022 |
| Transatlantic Retina Ltd | Health & social care | 2026 |
| Transformative Change Consulting LLP | | 2022 |
| Transformed Driveways (Central) Limited | Construction | 2013 |
| Transition Finance Limited | Financial services | 2025 |
| Travel Expert KAT Ltd | Administrative & support | 2023 |
| Trelawn Property Management Ltd | Construction | 2020 |
| Trend 7 (Northampton) Limited | Wholesale & retail | 2008 |
| Trident Telecoms Ltd | Information & communication | 2023 |
| Trinity Connections Limited | Administrative & support | 2007 |
| Tritana Ltd | Administrative & support | 2024 |
| Trivinci (UK) Limited | Information & communication | 2009 |
| Trixabelles Limited | Other services | 2016 |
| Trotter & Co Limited | Other services | 1998 |
| True Blue Digital Media Ltd | Information & communication | 2014 |
| True North CBT Limited | Health & social care | 2025 |
| Trym Consulting Limited | Other services | 2020 |
| Ts&W Limited | Manufacturing | 1989 |
| Tuckley Chester Design Limited | Professional & scientific | 2000 |
| Tudor Research Limited | Other services | 2022 |
| TVG Ltd | Transport & logistics | 2026 |
| TWG Cadillac Formula 1 Team Limited | Arts & recreation | 2022 |
| TWG GM Performance Power Units (UK) Limited | Manufacturing | 2025 |
| Twin and Earth Limited | Administrative & support | 2013 |
| U.P.A. (M.K.) Ltd | Arts & recreation | 2015 |
| Uber Health Ltd | Health & social care | 2017 |
| UBL Holdings Ltd | Professional & scientific | 2019 |
| UK Celik Kebab Ltd | Hospitality | 2026 |
| UK Planet Tools Limited | Wholesale & retail | 2010 |
| Ultimate Martial Arts Championships Ltd | Wholesale & retail | 2022 |
| Ultra Secure Limited | Wholesale & retail | 2003 |
| Unexpected Books Ltd | Information & communication | 2019 |
| Uniek Ltd | Information & communication | 2024 |
| Union Incorporated Limited | Real estate | 2004 |
| Unity Bridge Consulting Limited | Professional & scientific | 2024 |
| Unoshoes.Com Limited | Wholesale & retail | 2015 |
| Upton Mill Farm Limited | Agriculture & fishing | 1985 |
| Urban Industrial Income LP | | 2021 |
| Urgent Works Ltd | Other services | 2010 |
| Usoneproduction Limited | Arts & recreation | 2013 |
| UT Service and Maintenance Limited | Construction | 2013 |
| Utilytek Service Solutions Ltd | Construction | 2018 |
| V Attwater Ltd | Education | 2022 |
| V.V Berry Limited | Wholesale & retail | 2024 |
| Vacant Space Management Limited | Real estate | 2011 |
| VALENTINO29 Ltd | Wholesale & retail | 2025 |
| Validus Consultancy Services Limited | Professional & scientific | 2009 |
| Validus Endeavour Investments | Financial services | 2018 |
| Vallance Consulting Limited | Professional & scientific | 2024 |
| Van Diemen Ltd | Professional & scientific | 2020 |
| Vanessa Horne Beauty Ltd | Other services | 2003 |
| Vanlord Holding UK Limited | Financial services | 2022 |
| Vanquish Design & Print Ltd | Manufacturing | 2016 |
| Vape Supply Company Limited | Wholesale & retail | 2018 |
| Vapour Blasting Northants Limited | Wholesale & retail | 2017 |
| Variety Funerals Limited | Other services | 2023 |
| Vazrogers Consulting Ltd | Information & communication | 2021 |
| Vcrasnojon Ltd | Wholesale & retail | 2020 |
| VE07 Brip Feeder Limited | Financial services | 2024 |
| Veller Labs Ltd | Information & communication | 2026 |
| Velo Barn Equipment Limited | Professional & scientific | 2018 |
| Velo Barn Property Limited | Real estate | 2018 |
| Vertecol Limited | Professional & scientific | 2020 |
| Vervo Marketing Limited | Information & communication | 2023 |
| Vessel Coffee Limited | Manufacturing | 2024 |
| Vetoquinol UK Limited | Administrative & support | 1981 |
| Veycom Ltd | Professional & scientific | 2014 |
| Viet HOA 6889 Ltd | Real estate | 2025 |
| Vintage Aircraft Radiators Limited | Manufacturing | 2017 |
| Vintage Car Radiator Company Limited | Manufacturing | 2001 |
| Virtual Orchard Limited | Manufacturing | 2012 |
| Vision Group Training Limited | Arts & recreation | 2017 |
| VMR Property Ltd | Real estate | 2016 |
| Volmo Ltd | Professional & scientific | 2012 |
| Volvass Limited | Wholesale & retail | 2014 |
| VON Clinic Ltd | Other services | 2019 |
| Voodoo AP Limited | Manufacturing | 2017 |
| Voodoo Consultancy Limited | Information & communication | 2007 |
| Voodoo Consultants Limited | Information & communication | 2007 |
| Voodoo Group Limited | Hospitality | 2007 |
| Voodoo USA Ltd | Extraterritorial | 2013 |
| Vorteq Sports Limited | Manufacturing | 2019 |
| Vouchermine Limited | Administrative & support | 2018 |
| Vtrue Properties Ltd | Real estate | 2024 |
| W Humphries Limited | Real estate | 2008 |
| W. H. Leach & Sons (Ivinghoe) Limited | Agriculture & fishing | 1960 |
| W. Irlam (Stoke Plain) Limited | Agriculture & fishing | 1971 |
| Wagyu Malta Holdings Ltd | Financial services | 2024 |
| Walnut House Limited | Wholesale & retail | 2025 |
| Walskipper Advisors Ltd | Professional & scientific | 2016 |
| Walter Payne Limited | Real estate | 2018 |
| Walter Williams Heating Ltd | Construction | 2023 |
| Watling Land Ltd | Construction | 2023 |
| Watling Street Homes Ltd | Construction | 2016 |
| Watling Street West Management Company Limited | Households | 2020 |
| WAX and Water Ltd | Manufacturing | 2020 |
| WE ARE Align Limited | Information & communication | 2022 |
| Weals Motoring and Leisure Ltd | Wholesale & retail | 2010 |
| Wear Your Vibe Ltd | Extraterritorial | 2024 |