| Third Connaught Park Residents Association Limited(The) | Hospitality | 1986 |
| Thirtyseventy Limited | Arts & recreation | 2007 |
| Thom Properties Limited | Real estate | 2024 |
| Thornberry Property Investments Limited | Real estate | 2008 |
| Thorpe LEA Fishery Limited | Agriculture & fishing | 2008 |
| Three ES Recruitment Ltd | Administrative & support | 2023 |
| Three Walls Ltd | Real estate | 2025 |
| Thrival Holdings Ltd | Information & communication | 2026 |
| Thunderball Riders Ltd | Extraterritorial | 2014 |
| Tiftik Food and Beverage Ltd | Wholesale & retail | 2026 |
| TIM Huntington and Associates Ltd. | Professional & scientific | 2001 |
| Timing Pulleys International Limited | Manufacturing | 1977 |
| TJF Property Services Limited | Construction | 2025 |
| TJW Direct Logistics Limited | Administrative & support | 2025 |
| TM Catering Limited | Hospitality | 2023 |
| TN9 Properties Limited | Real estate | 2023 |
| Toby Meakins Limited | Information & communication | 2019 |
| TOM Haddon Makes Ltd | Professional & scientific | 2024 |
| TOM TOM Club Limited | Arts & recreation | 2021 |
| TON 2 SIL Ltd | Other services | 2025 |
| Top-Guards Limited | Health & social care | 2015 |
| Topclean (South East) Limited | Administrative & support | 2007 |
| Torrential Investments Ltd | Health & social care | 2019 |
| Towards the Quran Limited | Education | 2025 |
| Trafikio Limited | Information & communication | 2026 |
| Trans WIN Solution Ltd | Transport & logistics | 2023 |
| Transmission Developments Limited | Professional & scientific | 2005 |
| Transport by Alex Ltd | Transport & logistics | 2017 |
| Transportrade Ltd | Transport & logistics | 2016 |
| Travara Ltd | Wholesale & retail | 2025 |
| Traylen Bros. Ltd | Construction | 2022 |
| Traylen Enterprises Limited | Wholesale & retail | 1996 |
| Traylen Group Limited | Manufacturing | 2021 |
| Traylen Interim Ltd | Construction | 2022 |
| Traylen Limited | Extraterritorial | 2010 |
| Traylen Talent Management Ltd | Professional & scientific | 2021 |
| Traylen Technologies Ltd | Construction | 2018 |
| Traylen Travel Ltd | Administrative & support | 2022 |
| Tridenti Ltd | Wholesale & retail | 2022 |
| Trimaster U.K. Limited | Manufacturing | 2017 |
| Triom Limited | Wholesale & retail | 2020 |
| Trippee.Co.Uk Ltd | Information & communication | 2021 |
| Triton Waste Management Limited | Water & waste | 2010 |
| Trowel Master Ltd | Construction | 2024 |
| TRT Aviation Limited | Transport & logistics | 2022 |
| Truck in Hub Limited | Wholesale & retail | 2024 |
| Truly Inspired by YOU Ltd | Wholesale & retail | 2025 |
| Trusted Statutory Inspections Ltd | Other services | 2023 |
| Tudor Estate Agents Limited | Real estate | 2012 |
| Tudor Lettings & Management Ltd | Real estate | 2013 |
| TUK TUK Station Road Limited | Hospitality | 2024 |
| Turner Hampton Secretaries Limited | Extraterritorial | 2001 |
| Turner PR Limited | Professional & scientific | 2007 |
| TVR Supplies Limited | Manufacturing | 2019 |
| TW Publications Ltd | Information & communication | 2024 |
| Twinflames Sanctum Ltd | Wholesale & retail | 2022 |
| U L E Property Management & Maintenance Ltd | Administrative & support | 2025 |
| Uddin IT Consultancy Limited | Information & communication | 2021 |
| Udisys Limited | Wholesale & retail | 2017 |
| UK Chinese Arts Festival Committee Ltd | Arts & recreation | 2026 |
| Ultimate Innovations UK Limited | Information & communication | 2011 |
| Ultra Evolution Limited | Information & communication | 2015 |
| UMI7 Ltd | Hospitality | 2025 |
| Unblockchange Ltd | Professional & scientific | 2022 |
| Unique Hair Design and Beauty Limited | Other services | 2011 |
| Unlocked Vision Entertainment Ltd | Administrative & support | 2014 |
| Unmatched Apparel Ltd | Wholesale & retail | 2019 |
| Upon a Silhouette Ltd | Manufacturing | 2021 |
| Urban Insight Ltd | Real estate | 2011 |
| Urban Whole Foods Ltd Limited | Administrative & support | 2016 |
| US Girls Decorating Limited | Construction | 2016 |
| Usher Financial Services Limited | Financial services | 2016 |
| Uxbridge House (Kingston) Residents Association Limited | Households | 1985 |
| V & a Aviation Limited | Transport & logistics | 2013 |
| V Flooring Ltd | Construction | 2023 |
| V&J Billington Limited | Health & social care | 2009 |
| V. & a. Automotive Limited | Wholesale & retail | 2008 |
| Van Santen Limited | Real estate | 2005 |
| Vanners Freehold Limited | Construction | 2015 |
| Varnham Performing Arts Ltd | Arts & recreation | 2024 |
| Vcorporation Limited | Transport & logistics | 2023 |
| VE Pharmaceutical Distribution Limited | Wholesale & retail | 2026 |
| Vector Strategies Ltd | Professional & scientific | 2025 |
| Vector SUM Consulting Limited | Information & communication | 1996 |
| Velvet Razor Limited | Information & communication | 2012 |
| Venues for Events UK Limited | Arts & recreation | 2000 |
| Verisure Roofing Ltd | Construction | 2022 |
| Viam TV Network Ltd | Information & communication | 2021 |
| Vibesama Ltd | Wholesale & retail | 2021 |
| Victoria Gate Estate Road Management Company Limited | Households | 1997 |
| Victoria Gate Management Company Limited | Households | 1997 |
| Victory Media Limited | Information & communication | 2018 |
| Victory Park CIC | Arts & recreation | 2025 |
| Village Cooks Limited | Hospitality | 2015 |
| Village Matters Limited | Information & communication | 2013 |
| Vinera Construction Ltd | Construction | 2006 |
| Vinhais Properties Ltd | Households | 2025 |
| VIP Wide Transfers Limited | Transport & logistics | 2019 |
| Vira AI Limited | Information & communication | 2024 |
| Virdee Property Group Limited | Real estate | 2018 |