| TOM Sharp TV Ltd | Information & communication | 2022 |
| Tombuie Holdings Ltd | Financial services | 2023 |
| Tony Hutchinson & Co Limited | Professional & scientific | 2015 |
| Tony Properties Limited | Real estate | 2024 |
| Top Plumbing and Heating Limited | Construction | 2022 |
| Topnest Estate Ltd | Financial services | 2025 |
| Tornado HPC Limited | Construction | 2010 |
| Toussaint Ltd | Arts & recreation | 2015 |
| Toward Property Investments Ltd | Real estate | 2025 |
| Towfa Limited | Manufacturing | 2017 |
| TPP Global Ltd | Wholesale & retail | 2023 |
| Tprox Limited | Wholesale & retail | 2025 |
| Trademark Management Limited | Wholesale & retail | 1969 |
| Tradeslink Solutions Ltd | Administrative & support | 2024 |
| Tradita Finchley Limited | Hospitality | 2024 |
| Traffic Gurus Limited | Professional & scientific | 2019 |
| Train Healthcare Limited | Professional & scientific | 2014 |
| Train With Tone Ltd | Other services | 2022 |
| Tranfuture Limited | Information & communication | 2018 |
| Trangs (UK) Limited | Wholesale & retail | 2006 |
| Transport K&M Company Limited | Transport & logistics | 2014 |
| Trapp Door CIC | Education | 2025 |
| Travel Portal Online Ltd | Wholesale & retail | 2022 |
| Tres Equis Ltd | Wholesale & retail | 2019 |
| Tripinstyle Limited | Administrative & support | 2024 |
| Triple M National Ltd | Wholesale & retail | 2025 |
| Tripstoo Ltd | Transport & logistics | 2016 |
| Triviumx Ltd | Wholesale & retail | 2025 |
| Trodaire Holdings Limited | Real estate | 2025 |
| Trodaire Ltd | Professional & scientific | 2024 |
| Tropsmu Ltd | Information & communication | 2016 |
| True Form Building Group Ltd | Construction | 2025 |
| Truegraphics Ltd | Professional & scientific | 2019 |
| Trusted Projects London Ltd | Construction | 2026 |
| Trusty Motors Ltd | Wholesale & retail | 2023 |
| Truvelo (UK) Limited | Manufacturing | 1993 |
| Tsunami Labs Ltd | Information & communication | 2023 |
| Ttech Ltd | Information & communication | 2015 |
| TU I Teraz Ltd | Wholesale & retail | 2020 |
| TU Nguyen Management Ltd | Real estate | 2020 |
| Tur&Tur Ltd | Construction | 2014 |
| Turner Consulting International Limited | Information & communication | 2017 |
| Tuton Consulting Ltd. | Professional & scientific | 2020 |
| TV Control Ltd | Information & communication | 2013 |
| Tvcloud Ltd | Information & communication | 2019 |
| Tweebaa UK Limited | Wholesale & retail | 2012 |
| Twickenham Joinery Limited | Manufacturing | 2025 |
| Twin Horizon Ltd | Wholesale & retail | 2025 |
| Twisted Grain Limited | Hospitality | 2017 |
| Two Seven Stage Work Limited | Construction | 2016 |
| U-Tech Controls Ltd | Professional & scientific | 2022 |
| Uberoi Notary Public Limited | Professional & scientific | 2021 |
| UCS Consulting Ltd | Professional & scientific | 2011 |
| Ugenesuk Ltd | Information & communication | 2023 |
| UK China Culture Exchange Ltd | Administrative & support | 2013 |
| UK Immigration Help Limited | Professional & scientific | 2014 |
| UK Worker Limited | Other services | 2021 |
| Uk-China Tourism Consulting Service Limited | Professional & scientific | 2014 |
| Uk-Karnataka Business Chamber Limited | Other services | 2017 |
| Ukentv Ltd | Information & communication | 2022 |
| Ukka K Ltd | Professional & scientific | 2018 |
| Ultima Interiors Ltd | Construction | 2019 |
| Ultimate Design Studio Limited | Professional & scientific | 2020 |
| Ultimate Mixed Martial Arts Ltd | Wholesale & retail | 2019 |
| Ultimate Sports Performance Academy Ltd | Professional & scientific | 2019 |
| Unattend Limited | Information & communication | 2003 |
| UNI Designers Limited | Arts & recreation | 2016 |
| Unicorn LAB Consulting Ltd | Information & communication | 2026 |
| Unique 69 Ltd | Wholesale & retail | 2021 |
| Unique Tech Limited | Wholesale & retail | 2023 |
| Uniquevision Construction Limited | Construction | 2023 |
| United Stone Ltd | Manufacturing | 2020 |
| Universal Company Incorporations Ltd | Administrative & support | 2013 |
| Universe Education Ltd | Education | 2008 |
| Uquber UK Limited | Construction | 2024 |
| Urban Iron Ltd. | Manufacturing | 2010 |
| Urban Projekt Limited | Financial services | 2025 |
| Urban Pulse Production House Ltd | Information & communication | 2025 |
| Urbanrbx Ltd | Professional & scientific | 2020 |
| Uria Capital Ltd | Financial services | 2025 |
| Urolime Technologies Ltd | Information & communication | 2020 |
| Used Printing Machinery Ltd | Wholesale & retail | 2023 |
| Utickets Limited | Wholesale & retail | 2025 |
| Uxerv Ltd | Information & communication | 2006 |
| V & J Flats Ltd | Real estate | 2023 |
| V B Staffing Limited | Health & social care | 2016 |
| V20 Consultancy Limited | Construction | 2020 |
| V24CONSULTING Ltd | Professional & scientific | 2024 |
| Vadaco Ltd | Real estate | 2022 |
| Vakilix Limited | Wholesale & retail | 2025 |
| Valeye Limited | Wholesale & retail | 2024 |
| Value Ties Ltd | Wholesale & retail | 2024 |
| Vanessa Studio Hair Ltd | Other services | 2026 |
| Vantage AI Ltd | Information & communication | 2019 |
| Vavoconsulting Ltd | Wholesale & retail | 2023 |
| Vaxy Limited | Wholesale & retail | 2021 |
| VBS Beaumont Ltd | Construction | 2025 |
| VBS Valoores Group Ltd | Information & communication | 2018 |
| Vector Sustainable Energy Limited | Professional & scientific | 2019 |
| Vectormatrix Limited | Information & communication | 2019 |