| TK23 Limited | Households | 2018 |
| TM Technology Limited | Information & communication | 2026 |
| TMN Sports Ltd | Arts & recreation | 2024 |
| TMS Accounting Services Ltd. | Professional & scientific | 2011 |
| TMT Legal Solutions Limited | Other services | 2012 |
| Toggl Events Limited | Professional & scientific | 2025 |
| TOM Dunman Associate Ltd | Other services | 2018 |
| TOM Keep Consulting Limited | Professional & scientific | 2022 |
| TOM Marsden Ltd | Professional & scientific | 2008 |
| TOM Oswald Limited | Professional & scientific | 2015 |
| Topengs Ltd | Professional & scientific | 2022 |
| TP2 Sports Management Limited | Professional & scientific | 2020 |
| Tpdom Ltd | Real estate | 2018 |
| Tracey Frost Coaching Ltd | Professional & scientific | 2022 |
| Track Education Limited | Education | 2011 |
| Trading Research Limited | Other services | 1999 |
| Trafalgar Residents Management Limited | Households | 2025 |
| Transbrand Limited | Real estate | 1987 |
| TRANSCEND360 Group Limited | Information & communication | 2012 |
| Tricky Pixels Ltd | Information & communication | 2009 |
| Trio Pictures Limited | Information & communication | 2007 |
| Trocex Limited | Professional & scientific | 2024 |
| True Gentleman Limited | Wholesale & retail | 2011 |
| Truzo Ltd | Information & communication | 2020 |
| TSG Ltd | Information & communication | 2020 |
| TT Technology Solutions Limited | Information & communication | 2014 |
| TTS Surfacing Limited | Construction | 2007 |
| Tuli and JAA Limited | Other services | 2025 |
| Tulip Marketing Limited | Professional & scientific | 2024 |
| Tundo Ltd | Professional & scientific | 2016 |
| Turbex Limited | Wholesale & retail | 1981 |
| Tutors From England Ltd | Administrative & support | 2024 |
| TW49 Limited | Arts & recreation | 2025 |
| Twenty-Nine Thornton Hill Limited | Households | 1980 |
| TYE Services Limited | Professional & scientific | 2026 |
| Tyrolese (668) Limited | Administrative & support | 2009 |
| Uduvai Makkal Mantram Limited | Education | 2021 |
| UK Biotop Botanical Science Ltd | Mining & quarrying | 2020 |
| UK Media Monitoring Association Limited | Other services | 2001 |
| Unaccompanied Project Limited | Information & communication | 2014 |
| Unburden and Thrive Ltd | Health & social care | 2025 |
| UNI Excellence Limited | Education | 2017 |
| Unicomarine Limited | Professional & scientific | 2013 |
| Unified AI Platforms Ltd | Information & communication | 2023 |
| United Kingdom Accreditation for Human Sciences Ltd | Public administration | 2020 |
| Untold Digital Limited | Information & communication | 2015 |
| Upgrade Services Surrey Ltd | Construction | 2025 |
| Urban Print Studio Limited | Wholesale & retail | 2018 |
| Urban Sites Limited | Real estate | 2010 |
| Urbanicity (NO. 10) LLP | | 2012 |
| Urbanicity (NO. 16) LLP | | 2012 |
| Urbanicity (NO. 3) LLP | | 2011 |
| Urbanicity (NO. 9) LLP | | 2012 |
| Urbanicity (NO.20) LLP | | 2014 |
| V-Mech Limited | Construction | 2021 |
| Vaii Limited | Information & communication | 2023 |
| Valen Private Ltd | Real estate | 2026 |
| Valeno Fit Ltd | Education | 2025 |
| Valorem Capital Limited | Professional & scientific | 2018 |
| Vamm Health Care Limited | Financial services | 2022 |
| Van DYK Enterprises Ltd | Transport & logistics | 2024 |
| Variance Incorporated Limited | Information & communication | 2026 |
| VDR Consulting Limited | Professional & scientific | 2023 |
| Vefk Ltd | Wholesale & retail | 2018 |
| Velluto Ltd | Manufacturing | 2018 |
| Velpen Limited | Information & communication | 2023 |
| Vendor 2 Tender Limited | Professional & scientific | 2016 |
| Venkat Partnership LLP | | 2022 |
| Verdant Esports Limited | Arts & recreation | 2021 |
| Vero Software Limited | Information & communication | 1997 |
| Vertech Imaging Ltd | Information & communication | 2014 |
| Verve Concepts Commercial Limited | Construction | 2019 |
| Verve Concepts Limited | Construction | 2015 |
| Verve Concepts Residential Limited | Construction | 2019 |
| Verve Homes Limited | Construction | 2015 |
| VI Ltd | Information & communication | 2022 |
| Victoria Flats Management Limited | Real estate | 1994 |
| Viking-Europe Limited | Real estate | 1997 |
| Viola Ltd | Real estate | 2025 |
| Viola Partners LLP | | 2025 |
| VIP G&S Ltd | Wholesale & retail | 2026 |
| VIP Premier Chauffeurs Ltd | Transport & logistics | 2026 |
| Viridis Enterprises Limited | Extraterritorial | 2014 |
| Virox Vitamins Ltd | Wholesale & retail | 2026 |
| Virtual First Ltd | Information & communication | 2016 |
| Virtue Heating and Cooling Limited | Construction | 2021 |
| Virtuoso Interiors Ltd | Construction | 2009 |
| Virtuoso Luxury Travel Ltd | Administrative & support | 2026 |
| Visionary International Limited | Information & communication | 2016 |
| Vitalis Care and Support Ltd | Health & social care | 2019 |
| Vivente Developments Ltd | Construction | 2012 |
| Volcano Services Limited | Construction | 2019 |
| Vomor Limited | Administrative & support | 2023 |
| W Mckenna and Sons Landscapes Ltd | Construction | 2019 |
| W11 Aurora 1 Limited | Financial services | 2017 |
| W11 Property Investments Limited | Real estate | 2017 |
| W8 Warrior Limited | Other services | 2026 |
| Waste to Energy Limited | Manufacturing | 1998 |
| Waterford Close Management Company Limited | Real estate | 1996 |
| Waterford Close Property Limited | Real estate | 2024 |