| Toucan Telemarketing EOT Limited | Financial services | 2023 |
| Toucan Telemarketing Limited | Administrative & support | 2001 |
| Touchdown IT Ltd | Information & communication | 2004 |
| Tovan Properties Limited | Professional & scientific | 2015 |
| Towers & Sanders Ltd | Construction | 2005 |
| Toxpath Sciences Ltd | Professional & scientific | 2013 |
| Toyah Willcox Limited | Arts & recreation | 2006 |
| TPB Cheshire Limited | Construction | 2017 |
| TPD Stubbs Ltd | Professional & scientific | 2017 |
| Tract Engineering Limited | Professional & scientific | 2001 |
| Trafford Consultancy Ltd | Administrative & support | 2022 |
| Train Human Ltd | Education | 2018 |
| Tranik Limited | Professional & scientific | 2013 |
| Tranquilidad Limited | Professional & scientific | 2009 |
| Transition 360 Partners Limited | Administrative & support | 2026 |
| Trask Accountancy Services Limited | Professional & scientific | 2026 |
| Tread Ahead Ltd | Extraterritorial | 2021 |
| Treehouse Group Limited | Financial services | 2025 |
| Trelispen Ltd | Hospitality | 2019 |
| Trenchsafe Limited | Construction | 2019 |
| Triad Trade Textiles Limited | Wholesale & retail | 1983 |
| Triad UK Limited | Professional & scientific | 2008 |
| Tribar Weights Limited | Arts & recreation | 2017 |
| Trigrguard Ltd | Manufacturing | 2025 |
| Trim Trail Limited | Construction | 2015 |
| Trimplit Limited | Professional & scientific | 2012 |
| Tringle Limited | Professional & scientific | 2013 |
| Trinsle Limited | Professional & scientific | 2012 |
| Triple Tread Limited | Manufacturing | 2015 |
| Trowler Limited | Professional & scientific | 2014 |
| TRU Skylights Limited | Construction | 2021 |
| Truckfix (UK) Limited | Wholesale & retail | 2001 |
| True Line Convenience Ltd | Wholesale & retail | 2023 |
| Truly Laura Limited | Health & social care | 2018 |
| Trundl Ltd | Other services | 2020 |
| Trusley Limited | Professional & scientific | 2011 |
| Trusted Deed Poll Ltd | Administrative & support | 2025 |
| TRW Group Limited | Professional & scientific | 2018 |
| TS Livery Limited | Other services | 2020 |
| Tube-It Limited | Information & communication | 2015 |
| Tups Limited | Administrative & support | 2010 |
| Turkish Delight CW12 Ltd | Hospitality | 2026 |
| Turnaround Creative Limited | Professional & scientific | 2025 |
| Turnaround Print Services Ltd | Manufacturing | 2024 |
| TWA Developments Ltd | Construction | 2025 |
| TWA Project Services Ltd | Professional & scientific | 2022 |
| Twigg Builders Ltd | Construction | 2010 |
| Twin Bar 20 Limited | Hospitality | 2024 |
| Twin Bar 22 Limited | Hospitality | 2024 |
| Twinkle & Twine Ltd | Wholesale & retail | 2025 |
| Two Surveyors and a Cat Limited | Professional & scientific | 2023 |
| Tyler Cassells Education Limited | Education | 2026 |
| Tyler Cassells Equine Limited | Agriculture & fishing | 2016 |
| Tyler Cassells Eventing Limited | Agriculture & fishing | 2026 |
| Tyrrell Electrical (NW) Ltd | Construction | 2010 |
| Ucla Limited | Education | 2020 |
| Uhkconsultancy Ltd | Professional & scientific | 2019 |
| UK Entity Ltd | Professional & scientific | 2022 |
| UK Estimating Support Limited | Administrative & support | 2004 |
| UK Hair Medications Ltd | Wholesale & retail | 2021 |
| UK Hearing Centres Limited | Health & social care | 2007 |
| UK Philippines Asia Atlantic Ltd | Arts & recreation | 2025 |
| UK Worldwide Forwarding Ltd | Transport & logistics | 2026 |
| Umbasse Limited | Wholesale & retail | 2023 |
| Umbling Limited | Professional & scientific | 2015 |
| UMF Ltd | Information & communication | 2025 |
| UNA Graphika Ltd | Wholesale & retail | 2024 |
| Uncle Sam's Cellar Ltd | Wholesale & retail | 2025 |
| Underground Creative Ltd | Professional & scientific | 2015 |
| Unearth the Past Ltd | Professional & scientific | 2026 |
| Unique Labels and Ribbons UK Limited | Manufacturing | 2006 |
| Unitas Solutions Ltd | Professional & scientific | 2015 |
| Unity Projects Limited | Manufacturing | 1994 |
| Untern Limited | Professional & scientific | 2015 |
| UP Education & Technology Ltd | Wholesale & retail | 2020 |
| Upsilon Beta Investment Ltd | Manufacturing | 2012 |
| Urban Angels London Limited | Other services | 2013 |
| Urban Circus Limited | Arts & recreation | 2009 |
| Urban Event Services Ltd | Arts & recreation | 2003 |
| Ursa Scientific Ltd | Professional & scientific | 2017 |
| Usespace Limited | Real estate | 2019 |
| Utilityatom Limited | Manufacturing | 2014 |
| V.P. Engineering Ltd. | Administrative & support | 1999 |
| V8 Stock Cars Tour Ltd | Arts & recreation | 2018 |
| V:Kit Limited | Professional & scientific | 1998 |
| Valco Consulting Limited | Construction | 2017 |
| Valco Energi Systems Limited | Construction | 2008 |
| Vale Juniors (Congleton) Football Club Limited | Arts & recreation | 2001 |
| Vampire Bunnies Ltd | Wholesale & retail | 2014 |
| Vanguard Interpreting Ltd | Professional & scientific | 2026 |
| Vanilla in Allseasons Limited | Hospitality | 2010 |
| Vannin Motorsport Limited | Wholesale & retail | 2024 |
| Vantage Decorators Ltd | Other services | 2015 |
| Vantom Automotive Ltd | Wholesale & retail | 2022 |
| Vanton Pumps (Europe) Limited | Manufacturing | 2006 |
| Varmont Advisory Ltd | Professional & scientific | 2026 |
| Varoton Limited | Professional & scientific | 2015 |
| Vaston Maintenance Ltd | Administrative & support | 2024 |
| Vaughan and Partners Limited | Information & communication | 2022 |
| Vbhl Limited | Other services | 2025 |