| Trentham (ZW) Limited | Transport & logistics | 2019 |
| Tresmont Limited | Real estate | 1999 |
| Trevalyn Farm Management Company Limited | Real estate | 2006 |
| Trevalyn Industrial Limited | Construction | 2010 |
| Trevalyn Manor House Landlords Limited | Real estate | 2015 |
| Trevor Davis Engineering Services Limited | Construction | 2007 |
| Trewythen Hall Limited | Health & social care | 1982 |
| Tri-R Ltd | Wholesale & retail | 2021 |
| Tribomech Ltd | Professional & scientific | 2022 |
| Trident Automation Ltd. | Information & communication | 2014 |
| Triple Well Properties Limited | Real estate | 2022 |
| Tritech Group Limited | Manufacturing | 2005 |
| Tritech Precision Products (Barnstaple) Limited | Manufacturing | 1973 |
| Tritech Precision Products (Yeovil) Limited | Manufacturing | 2015 |
| Tritech Precision Products Limited | Manufacturing | 1982 |
| Triumph Letts Limited | Health & social care | 2013 |
| Tropos Analytics Ltd | Professional & scientific | 2025 |
| True Love Lights Limited | Manufacturing | 2026 |
| True North Rail Limited | Professional & scientific | 2018 |
| Trueman Developments Limited | Real estate | 2023 |
| Truly Engineering Limited | Professional & scientific | 2012 |
| Trust Insight Ltd | Professional & scientific | 2025 |
| Trustees of Furbs Limited | Administrative & support | 2008 |
| Trustwood Renovations Ltd | Construction | 2017 |
| TRY This Food Ltd | Hospitality | 2024 |
| Tryanix Limited | Information & communication | 2025 |
| Trythaishop Limited | Wholesale & retail | 2008 |
| TS Tools Ltd | Wholesale & retail | 2025 |
| Ttbca Ltd | Other services | 2021 |
| TTN Engineering Ltd | Manufacturing | 2012 |
| TTS Van Hire Limited | Administrative & support | 2018 |
| Tudor Grange RTM Company Limited | Households | 2011 |
| Tudor House Insurance Services Limited | Financial services | 2004 |
| Turnpike Consulting Limited | Construction | 2016 |
| Tutorcraft Ltd | Education | 2023 |
| TVC Loans Npif GP Limited | Financial services | 2017 |
| TVC Vintage Ltd. | Extraterritorial | 2018 |
| Tvupb Limited | Financial services | 2013 |
| TW Fitness Limited | Education | 2021 |
| Twec Developments Ltd | Construction | 2016 |
| Twenty Four Seven Recruitment Services Limited | Administrative & support | 2000 |
| Two Brothers Fashion Limited | Wholesale & retail | 2020 |
| Two Doves FLY Limited | Wholesale & retail | 2019 |
| Two Heads Business Advisory Limited | Professional & scientific | 2020 |
| Two Languages Translation & Interpretation Company Ltd | Professional & scientific | 2025 |
| Twohalfs Estates Limited | Real estate | 2024 |
| TY Braf Limited | Real estate | 2021 |
| TY Cerise Limited | Real estate | 2025 |
| Ty'R Ddraig Limited | Information & communication | 2025 |
| Tycon Automation Ltd | Professional & scientific | 2009 |
| Tycon Holdings Limited | Financial services | 2024 |
| Tycon Investments Limited | Real estate | 2024 |
| TYN DWR Group Limited | Financial services | 2017 |
| TYN DWR Properties Limited | Financial services | 2017 |
| TYN Y Pystyll Farm Contracting Ltd | Agriculture & fishing | 2021 |
| Tyre Suppliers Ltd | Wholesale & retail | 2012 |
| Tyrella Rosettes Limited | Manufacturing | 1981 |
| Tyres N Tubes North West Limited | Wholesale & retail | 2003 |
| Tyres of Wrexham Limited | Extraterritorial | 2013 |
| Tyretrend Limited | Wholesale & retail | 2012 |
| TŶ Eco Construction Limited | Construction | 2012 |
| TŶ Eco MMC Limited | Manufacturing | 2020 |
| U Two Limited | Transport & logistics | 2021 |
| Uber Kids Limited | Extraterritorial | 2005 |
| UK Business Services Limited | Professional & scientific | 2022 |
| UK Cleaning Products Industry Association | Other services | 2026 |
| UK Electrical Engineering Limited | Professional & scientific | 2008 |
| UK Engineering Limited | Manufacturing | 2006 |
| UK EPI Limited | Construction | 2024 |
| UK HGV Hire Ltd | Administrative & support | 2026 |
| UK Holiday Home Sales Limited | Hospitality | 2025 |
| UK I-Health Ltd | Health & social care | 2023 |
| UK Mechanical Engineering Limited | Extraterritorial | 2008 |
| UK Park Home Sales Limited | Hospitality | 2025 |
| Uk.Neat Ltd | Professional & scientific | 2023 |
| Uken Tools UK Ltd. | Manufacturing | 2015 |
| Ukvapes Trading Limited | Wholesale & retail | 2013 |
| Ultimate Heating and Seamless Limited | Construction | 2013 |
| Ulysses Blue Homes Limited | Real estate | 2023 |
| Under One Roof Property Maintenance Ltd | Administrative & support | 2012 |
| Unequalled Plumbing Limited | Construction | 2023 |
| Unicorn Launderette Limited | Other services | 2003 |
| Unicorn Transport Solutions Limited | Transport & logistics | 2022 |
| Unicorn Travel Limited | Transport & logistics | 2025 |
| Unicorn Travel Wrexham Limited | Transport & logistics | 2015 |
| Uniform Stores UK Ltd | Wholesale & retail | 2021 |
| Unimaq Holdings Limited | Financial services | 2025 |
| Unimaq Ltd | Manufacturing | 1993 |
| Unistay (Island Green) Ltd | Hospitality | 2010 |
| Unistay (Walnut Tree) Ltd | Real estate | 2010 |
| United Padel Limited | Arts & recreation | 2025 |
| Universal Properties (Wrexham) Ltd | Households | 2020 |
| Unlimited Fabrication Ltd | Manufacturing | 2020 |
| Unlocked Escape Rooms Ltd | Arts & recreation | 2025 |
| UP Design & Print Limited | Professional & scientific | 2006 |
| Uplec Electronics Limited | Financial services | 1983 |
| Uplec Industries Limited | Manufacturing | 1982 |
| Urban Developments and Construction Limited | Construction | 2012 |
| Urban Marketing Ltd | Wholesale & retail | 2002 |
| Utilities Connections Management Limited | Construction | 2004 |