| Trade Paint Direct Ltd | Wholesale & retail | 2009 |
| Tradebe Dinnington Limited | Water & waste | 1991 |
| Tradebe Environmental Services Limited | Financial services | 1999 |
| Tradebe Fawley Limited | Water & waste | 1993 |
| Tradebe Fawley Midco Limited | Financial services | 2011 |
| Tradebe Gwent Limited | Water & waste | 1920 |
| Tradebe Healthcare (Holdings) Limited | Water & waste | 2013 |
| Tradebe Healthcare Limited | Water & waste | 1997 |
| Tradebe Healthcare National Limited | Water & waste | 1999 |
| Tradebe Heysham Limited | Water & waste | 2019 |
| Tradebe Management Limited | Water & waste | 2002 |
| Tradebe North West Limited | Water & waste | 2002 |
| Tradebe Refinery Services Limited | Water & waste | 1989 |
| Tradebe Solvent Recycling Limited | Water & waste | 1999 |
| Tradebe UK Limited | Other services | 2004 |
| Tradekart Limited | Wholesale & retail | 2021 |
| Transformer Consulting Ltd | Professional & scientific | 2023 |
| Tranzparent Limited | Professional & scientific | 2021 |
| Travis Associates Ltd | Construction | 2021 |
| Treacher Investments Ltd | Financial services | 2018 |
| Treasury Services Limited | Professional & scientific | 2023 |
| Tremayne Ltd | Wholesale & retail | 2023 |
| Treshure Limited | Professional & scientific | 2025 |
| Triangle Management Services (International) Limited | Professional & scientific | 1990 |
| Triangle Management Services Limited | Information & communication | 1986 |
| Tribestar Limited | Information & communication | 2017 |
| Triggerfish International Ltd | Arts & recreation | 2020 |
| Trinity House Management Company Limited | Households | 1988 |
| Troubled Waters Plumbing and Heating Services Limited | Construction | 2009 |
| Trusted Coach Directory Limited | Administrative & support | 2016 |
| TSL Professional Products Ltd. | Manufacturing | 2004 |
| TTO Construction Ltd | Construction | 2020 |
| Tualcom Global Holdings Limited | Financial services | 2025 |
| Tualcom UK Limited | Manufacturing | 2022 |
| Twaekye Konsulting Limited | Information & communication | 2016 |
| Tweleven Limited | Transport & logistics | 2007 |
| Twelve Bytes Limited | Manufacturing | 2010 |
| Twenty Five West Street Ltd | Real estate | 2018 |
| Twenty Three Living Ltd | Wholesale & retail | 2021 |
| Two Short and Curlies Ltd | Other services | 2017 |
| Twopointzero Limited | Professional & scientific | 2021 |
| Tyndale Mews Management Company Limited | Households | 2005 |
| Tyrer Aviation Group Ltd | Transport & logistics | 2026 |
| Tyresales Limited | Wholesale & retail | 2024 |
| Ubuntu Consultancy Ltd | Public administration | 2015 |
| UHG Holdings UK IV Limited | Financial services | 2003 |
| UHG Holdings UK V Limited | Financial services | 2015 |
| UHG Holdings UK VI Limited | Financial services | 2011 |
| UK Handyman Ltd | Construction | 2026 |
| UK Sports Institute Limited | Arts & recreation | 2002 |
| UK Sports NUT Ltd | Arts & recreation | 2016 |
| Ultc Coaching Ltd | Education | 2022 |
| Ultra Violet Ltd | Arts & recreation | 2018 |
| Umami Braise Ltd | Manufacturing | 2026 |
| Umpsters Lettings Limited | Real estate | 2010 |
| Umpsters Limited | Professional & scientific | 2006 |
| UN Dimanche a Paris Ltd | Wholesale & retail | 2019 |
| Unconventional Ltd | Professional & scientific | 2024 |
| Unicorn Specialists Limited | Professional & scientific | 1996 |
| Unique Commercials Ltd | Wholesale & retail | 2025 |
| Unique Health Group Ltd | Other services | 2015 |
| Unlock Fitness Limited | Arts & recreation | 2016 |
| Unlock Power Ltd | Information & communication | 2013 |
| Untold Goods Co Limited | Wholesale & retail | 2023 |
| UP School Limited | Administrative & support | 2023 |
| Uphoria Executive Cars Limited | Transport & logistics | 2017 |
| Uplivio Ltd | Information & communication | 2025 |
| Upskill Health Ltd | Information & communication | 2023 |
| Urban FOX Executive Coaching Ltd | Professional & scientific | 2010 |
| Us-Stark-Corporation Ltd | Wholesale & retail | 2016 |
| USB Promo Ltd | Information & communication | 2019 |
| Used Racking Ltd | Construction | 1987 |
| Using Less Ltd | Professional & scientific | 2022 |
| Using Less Stuff Limited | Other services | 2017 |
| Uyfs Ltd | Information & communication | 2023 |
| V23 Limited | Professional & scientific | 2010 |
| Vale Property Developments Limited | Construction | 1964 |
| Valemax Trading Limited | Real estate | 2006 |
| Valley View (Hazlemere) Limited | Households | 2012 |
| Vantora House Ltd | Wholesale & retail | 2026 |
| Vanwall Property Development Limited | Real estate | 2014 |
| Varney Aviation Limited | Professional & scientific | 2014 |
| Vasantham Foundation | Education | 2024 |
| Vaultamp Homes Ltd | Real estate | 2021 |
| Vection Technology Ltd | Administrative & support | 2002 |
| Vector and Scalar Products Limited | Information & communication | 1988 |
| Venio Technologies Ltd | Professional & scientific | 2019 |
| Ventac Global Limited | Professional & scientific | 2021 |
| Venturetec Ltd | Administrative & support | 2015 |
| Venus Hotels Limited | Administrative & support | 2025 |
| Venus Solutions Limited | Professional & scientific | 2007 |
| Verano Marketing Ltd | Professional & scientific | 2009 |
| Verdant Solutions Limited | Construction | 2004 |
| Verity Clifton Consulting Limited | Professional & scientific | 2015 |
| Vertec Group (Holdings) Ltd | Administrative & support | 2023 |
| Vertec Services Ltd | Administrative & support | 2023 |
| Vestra Global Sourcing UK Ltd | Construction | 2023 |
| Vibrant Impact Ventures Ltd | Professional & scientific | 2024 |
| Vintage Photo LAB Ltd | Other services | 2012 |
| Vinterprise Limited | Professional & scientific | 2016 |