| Triple SIX Limited | Administrative & support | 2018 |
| Triquetrum Limited | Professional & scientific | 2007 |
| Tritel Property Ltd | Real estate | 2020 |
| Trovare Casa Private Ltd | Real estate | 2026 |
| Trucare International Ltd | Extraterritorial | 2023 |
| Trucfix Ltd | Wholesale & retail | 2020 |
| Truck & Trailer Finance Limited | Administrative & support | 1998 |
| Trucommerce Limited | Wholesale & retail | 2025 |
| Trucryo Group Limited | Wholesale & retail | 2026 |
| Trucryo Limited | Manufacturing | 2015 |
| True Properties Shrewsbury Ltd | Real estate | 2026 |
| Truebuild Shrewsbury Ltd | Construction | 2020 |
| Truewood Joinery Limited | Construction | 2003 |
| Trurend Ltd | Extraterritorial | 2023 |
| Trust Technologies Limited | Professional & scientific | 2011 |
| Trusted Drivers Limited | Transport & logistics | 2022 |
| TSM Online Ventures Limited | Education | 2025 |
| Tsme Limited | Extraterritorial | 2001 |
| Tsme LLP | | 2009 |
| TSN Properties Ltd | Real estate | 2022 |
| TSO Family Holdings Limited | Health & social care | 2023 |
| TSP Plastering & Tiling Ltd | Construction | 2013 |
| Ttfn Family Holdings Ltd | Financial services | 2026 |
| Tudor Apartments Management Company (Shrewsbury) Limited | Real estate | 2014 |
| Tudor Bookkeeping Limited | Professional & scientific | 2021 |
| Tudor Gate Shrewsbury Management Company Limited | Administrative & support | 2012 |
| Tudor Watkins Limited | Professional & scientific | 2024 |
| Tudormay Essentials Ltd | Construction | 2025 |
| Tudors Field Management Company Limited | Households | 2019 |
| Tufton Street Management Limited | Households | 2006 |
| Tuipulotu Limited | Agriculture & fishing | 2023 |
| Turner and SON Limited | Real estate | 2024 |
| Turners Plumbing Engineers Ltd | Construction | 2008 |
| Turning Left Ltd | Transport & logistics | 2024 |
| Tusker Aviation Ltd | Wholesale & retail | 2024 |
| Tuungafasi Limited | Real estate | 2021 |
| TWC Logistics Ltd | Transport & logistics | 2019 |
| TWC Parcel Collection Services Limited | Transport & logistics | 2004 |
| Twemlows Holdco Limited | Financial services | 2016 |
| Twenty Four Projects Limited | Professional & scientific | 2026 |
| Twenty Seven Woodvale Road Limited | Households | 1997 |
| Twenty-One Pilot Ltd | Administrative & support | 2025 |
| Twinkle and Twilight Limited | Wholesale & retail | 2020 |
| Twisted Roots Dwellings Ltd | Real estate | 2023 |
| Twisted Roots Limited | Hospitality | 2018 |
| Two Eyes Enterprises Ltd | Wholesale & retail | 2017 |
| Two Homes Ltd | Real estate | 2024 |
| Twotoad Solutions Ltd | Professional & scientific | 2026 |
| TWP Enterprise Ltd | Real estate | 2025 |
| TY Criccieth Management Company Ltd | Real estate | 2013 |
| TYJ Pearlatt Ltd | Administrative & support | 2025 |
| Typhoon Slots and Models Ltd | Wholesale & retail | 2024 |
| Tyre Mania Automobile Limited | Transport & logistics | 2015 |
| Tyreforce Shrewsbury Limited | Wholesale & retail | 2005 |
| Ubani Hybrid LLP | | 2020 |
| Ubani Investments Limited | Real estate | 2020 |
| Ubmak Limited | Wholesale & retail | 2023 |
| UJR Sky Guitars Limited | Wholesale & retail | 2017 |
| UK Adventure Challenges Ltd | Arts & recreation | 2019 |
| UK Camera Fair Limited | Wholesale & retail | 2021 |
| UK Caravan Breaks Limited | Hospitality | 2023 |
| UK Completions Ltd | Construction | 2020 |
| UK Direction Ltd | Education | 2012 |
| UK Fade House Ltd | Other services | 2022 |
| UK Foodhall Holdings Ltd | Financial services | 2024 |
| UK IT Recycling Limited | Water & waste | 2004 |
| UK Netcom Limited | Information & communication | 2007 |
| UK Plastic Limited | Water & waste | 2024 |
| UK Premier Leisure Limited | Administrative & support | 2002 |
| UK4ASIA Limited | Education | 2014 |
| Uksportschat Limited | Arts & recreation | 2014 |
| Ultimate Fitness Events Ltd | Arts & recreation | 2020 |
| Umai Food Ltd | Hospitality | 2016 |
| Umas International Ltd | Professional & scientific | 2015 |
| Unicorn Fire & Safety Solutions Limited | Professional & scientific | 2011 |
| Unicube Studios Limited | Information & communication | 2014 |
| Unique Care Group Ltd | Health & social care | 2019 |
| Unique Cleaning & Maintenance Limited | Administrative & support | 2013 |
| Unique EFS Limited | Professional & scientific | 2019 |
| United Diesel Fuel Injection Services Ltd | Professional & scientific | 2001 |
| United Dragons FC (American Football) Ltd | Arts & recreation | 2021 |
| United Dragons FC (ST Albans) Ltd | Arts & recreation | 2021 |
| United Pipework Services Limited | Construction | 2014 |
| Universal Trade Frames Limited | Manufacturing | 1996 |
| Upper Eyton Limited | Construction | 2018 |
| Upper Onny Farmers CIC | Agriculture & fishing | 2025 |
| Upraw Media Limited | Professional & scientific | 2016 |
| UPS Direct Limited | Wholesale & retail | 1999 |
| Upskill International Limited | Administrative & support | 2025 |
| Upstaged Productions Ltd | Education | 2026 |
| Urban Building Care Ltd | Real estate | 2024 |
| Urban Cowshed Limited | Wholesale & retail | 2023 |
| Urban Inspiration Properties Ltd | Construction | 2008 |
| Urban Quarter (Hengrove) Management Company Ltd | Households | 2019 |
| Urbanmatt Limited | Construction | 2007 |
| Urespec Limited | Professional & scientific | 2007 |
| Urquhart Plumbing & Heating Ltd | Construction | 2012 |
| US3 Group Ltd | Wholesale & retail | 2023 |
| UWT (UK) Limited | Manufacturing | 2009 |
| V & J Properties Limited | Construction | 1989 |