| Tiredevymis Ltd | Wholesale & retail | 2026 |
| TJ Contract Services Limited | Other services | 2013 |
| TL Commercial Cleaners Limited | Administrative & support | 2022 |
| TLB Hair Ltd | Other services | 2023 |
| TMF Construction LDN Ltd | Construction | 2026 |
| Tmic-Group Ltd | Manufacturing | 2024 |
| Tomstal Ltd | Manufacturing | 2019 |
| Tookland (Vine Street) Limited | Construction | 2019 |
| Tookland Holdings Limited | Real estate | 2018 |
| Tookland Limited | Construction | 2014 |
| Top Deal Salvage N&L Ltd | Wholesale & retail | 2018 |
| Top Dog Turf Ltd | Administrative & support | 2017 |
| Top House Mortgage Solutions Limited | Financial services | 2008 |
| Top Notch Wood Ltd | Wholesale & retail | 2022 |
| Topbuild Developments (Cambs) Limited | Construction | 2021 |
| Tormey Holdings Limited | Real estate | 2023 |
| Total Aesthetics Clinic Ltd | Other services | 2024 |
| Total Training Club Limited | Wholesale & retail | 2023 |
| Total Vehicle Solutions Group Limited | Financial services | 2018 |
| Totally Financial Planning Limited | Financial services | 2010 |
| Towler Construction Limited | Construction | 2002 |
| TPF Underfloor Heating Supplies Ltd | Construction | 2017 |
| Tramways Group Ltd | Wholesale & retail | 2024 |
| Tranquil Garden Escapes Ltd | Wholesale & retail | 2023 |
| Trans Damira Ltd | Transport & logistics | 2015 |
| Trans Daniela&Valentin Ltd | Transport & logistics | 2023 |
| Transport Solution Ltd | Wholesale & retail | 2003 |
| Transvelo Ltd | Transport & logistics | 2025 |
| Tranz-Tech Ltd | Wholesale & retail | 2014 |
| Travelbugz Limited | Administrative & support | 2003 |
| TRD Trans Ltd | Transport & logistics | 2018 |
| Tree Work & Surveys Limited | Agriculture & fishing | 2016 |
| Trend 2000 Ltd. | Construction | 1997 |
| Trevor Diggins Limited | Wholesale & retail | 2005 |
| Trevor Nokes Music Ltd | Information & communication | 2021 |
| Trilogy Enviro UK Ltd | Wholesale & retail | 2025 |
| Triple T Autos Ltd | Wholesale & retail | 2022 |
| TRS Lettings Ltd | Real estate | 2024 |
| Trucking Sounds Limited | Construction | 2021 |
| Truckmax Limited | Manufacturing | 2011 |
| Truckmixer (U.K.) Limited | Manufacturing | 2011 |
| Trucktech Handling Ltd | Manufacturing | 2012 |
| Truckweld Limited | Wholesale & retail | 2005 |
| Trueblue Plumbing Limited | Construction | 2026 |
| Truk Ltd | Transport & logistics | 2024 |
| Truxstyle Limited | Extraterritorial | 2012 |
| TS Management Consultants Ltd | Hospitality | 2015 |
| Tudor Lodge Builds Ltd | Extraterritorial | 2022 |
| Tudor Lodge Investments Ltd | Real estate | 2022 |
| Tuition Centre Reflection Ltd | Education | 2020 |
| Turks Tenancy and Letting Limited | Real estate | 2018 |
| Turner Agricultural Holdings Ltd | Financial services | 2026 |
| Turner Contracting Ltd | Construction | 2002 |
| Turner Finance Ltd | Financial services | 2012 |
| TVS Interfleet Limited | Financial services | 2016 |
| TWH 2025 Ltd | Extraterritorial | 2025 |
| Twigden Motors Ltd | Wholesale & retail | 2020 |
| Twin Commercial Storage Ltd | Real estate | 2022 |
| Twyman Financial Solutions Ltd | Financial services | 2016 |
| Tydd Gote Caravan Site Limited | Hospitality | 2020 |
| Tydd Properties Ltd | Real estate | 2018 |
| Tyre Alliance Ltd | Wholesale & retail | 2025 |
| U.K. Vidmax Group Ltd | Other services | 2018 |
| UK Coating Services Ltd | Construction | 2023 |
| UK Enforcement Services Limited | Administrative & support | 2012 |
| UK N & S Limited | Administrative & support | 2012 |
| UK Power Connections & Consultants Ltd | Construction | 2020 |
| Ukosproperties Limited | Real estate | 2020 |
| Ultimate Wheels Ltd | Wholesale & retail | 2025 |
| Unique Bridal Limited | Wholesale & retail | 2019 |
| Unique Curtains & Blinds Limited | Wholesale & retail | 2013 |
| Unique Garden Cafe Limited | Hospitality | 2013 |
| Unique Gifts & Interiors Ltd | Wholesale & retail | 2005 |
| Unique Property Solutions Limited | Construction | 2026 |
| Unique Welding Limited | Manufacturing | 2011 |
| Unitas Holdings Ltd | Professional & scientific | 2012 |
| United Motors (Cambs) Ltd | Wholesale & retail | 2024 |
| United SDS Limited | Wholesale & retail | 2024 |
| United Steel & Cladding Limited | Construction | 2021 |
| Unity Market Services Ltd | Information & communication | 2010 |
| Unlimitech Ltd | Real estate | 2017 |
| UP Streame Ltd | Construction | 2012 |
| Upcycling and Co Limited | Other services | 2025 |
| Uptober Ltd | Wholesale & retail | 2024 |
| Urbanlink Services Limited | Construction | 2008 |
| UV Haulage Ltd | Transport & logistics | 2022 |
| V Transportation Limited | Administrative & support | 2016 |
| VAL Rowe (Packaging) Limited | Real estate | 1977 |
| Vale Aesthetics by Emily Ltd | Other services | 2025 |
| Valentine Property Developments Ltd | Construction | 2025 |
| Valeri Transport Limited | Transport & logistics | 2016 |
| Valiant Properties Ltd | Real estate | 2010 |
| Van Hool Industrial Vehicles Limited | Wholesale & retail | 2025 |
| Vantage Flight Ltd | Information & communication | 2025 |
| Vape Center Wisbech Ltd | Wholesale & retail | 2023 |
| Vape Centre Lease Ltd | Real estate | 2023 |
| Vasari Development Limited | Professional & scientific | 2009 |
| VCF Contractors Ltd | Construction | 2025 |
| Velano Ltd | Wholesale & retail | 2025 |
| Vendelicious Ltd | Wholesale & retail | 2026 |