| THL13 Investments Limited | Real estate | 2026 |
| Thomas Henry Property Investments Ltd | Real estate | 2020 |
| Three Salmons Hotel Limited | Real estate | 1973 |
| Thundercat Industries Limited | Professional & scientific | 2024 |
| Thymespring Property Management Limited | Households | 2002 |
| TI22 Vehicle Services Ltd | Wholesale & retail | 2015 |
| Time Motorsport Ltd | Manufacturing | 2013 |
| Tintern Abbey Cottage Limited | Hospitality | 2011 |
| Tintern Propco Limited | Real estate | 2022 |
| Title & Deeds Commercial & Residential Property Law Ltd | Professional & scientific | 2026 |
| Tixxi Limited | Construction | 2019 |
| TJJ Limited | Information & communication | 1995 |
| Topazbridge Limited | Real estate | 1989 |
| TORTOISES4YOU Limited | Wholesale & retail | 2021 |
| Total Film Crew Ltd | Information & communication | 2017 |
| Totius Limited | Information & communication | 2018 |
| Toytastik Limited | Wholesale & retail | 2015 |
| Treetop Co Bristol Ltd | Construction | 2020 |
| Trenfield Williams Limited | Professional & scientific | 2009 |
| TRI - the Right Ingredients Limited | Professional & scientific | 2013 |
| Tribe PR Ltd | Information & communication | 2018 |
| Triclean Global Limited | Financial services | 2025 |
| Trims Town Gate Butchery Ltd | Wholesale & retail | 2018 |
| Triumph Security Co Limited | Administrative & support | 2017 |
| TRS Golf Ltd | Arts & recreation | 2019 |
| True Vision Productions Wales Limited | Information & communication | 2016 |
| TSA Consulting Limited | Arts & recreation | 2007 |
| TSC Group Holdings Ltd | Financial services | 2025 |
| Tsung Limited | Information & communication | 2006 |
| Turbulence Ltd | Information & communication | 2023 |
| TXO Delta Bidco Limited | Financial services | 2023 |
| TXO Delta Midco Limited | Financial services | 2023 |
| TXO Systems Ltd | Information & communication | 2005 |
| TY MOR Properties Ltd | Real estate | 2017 |
| TYE Property Services Ltd | Construction | 2025 |
| Ubiza Limited | Professional & scientific | 2011 |
| Uglymugcafe,Chepstow Ltd | Hospitality | 2024 |
| UK Connected Limited | Information & communication | 2015 |
| UK Keder Ltd | Construction | 2022 |
| Under the Oak Films Limited | Information & communication | 2014 |
| Unicorn Management Consultancy Ltd | Professional & scientific | 2018 |
| Unique Flightcases Ltd | Manufacturing | 2016 |
| Usher Shooting Ltd | Education | 2025 |
| USK Investments Limited | Real estate | 2010 |
| V L C Ltd | Administrative & support | 2019 |
| Vaideanu Ltd | Other services | 2023 |
| Valley Springs Properties Limited | Real estate | 2018 |
| Vandal Music Services Ltd | Arts & recreation | 2019 |
| Vaughan Echo Diagnostics Ltd | Health & social care | 2022 |
| Vaultwin Limited | Arts & recreation | 2025 |
| VCA Technology Ltd | Information & communication | 2007 |
| Vega Estates Ltd | Real estate | 2022 |
| Velokom Ltd | Extraterritorial | 2025 |
| Venus Building Company Limited | Real estate | 2000 |
| Veterinary Imaging Services Limited | Professional & scientific | 2021 |
| Vetha Ltd | Extraterritorial | 2015 |
| Vikingfit Gym Ltd | Arts & recreation | 2026 |
| Vimmo UK Limited | Real estate | 2016 |
| Vinzo Solutions Limited | Information & communication | 2024 |
| VIV Williams Consulting Ltd | Professional & scientific | 2020 |
| VLV Electrical Ltd | Manufacturing | 2024 |
| Volution Analytics UK Limited | Information & communication | 2019 |
| Volution Entertainment Limited | Information & communication | 2024 |
| Volution Music Discovery Ltd | Information & communication | 2019 |
| Volution Music Group Limited | Arts & recreation | 2019 |
| Volution Music Limited | Information & communication | 2004 |
| Volution Music Operations Limited | Information & communication | 2019 |
| Voyagent Limited | Administrative & support | 2024 |
| Wales and West Property Clearance Ltd | Water & waste | 2024 |
| Warsum Property Development Ltd | Construction | 2025 |
| Watchtower Way (Chepstow) Management Company Limited | Households | 2017 |
| Way Art West | Arts & recreation | 2001 |
| Wayfaring Landscapes Ltd | Administrative & support | 2020 |
| WE and MRS Jones Limited | Other services | 2022 |
| WE ARE Doing Good Ltd | Hospitality | 2021 |
| WE Love Surveyors Ltd | Real estate | 2022 |
| WE Were Hidden Ltd | Extraterritorial | 2025 |
| Weaving Electrical Limited | Construction | 2025 |
| Wecotec Limited | Other services | 2017 |
| WEE Movers Limited | Arts & recreation | 2022 |
| Weir Laundry Equipment Limited | Wholesale & retail | 2006 |
| Weir Rallying UK Ltd | Wholesale & retail | 2020 |
| Well Lane (Devauden) Management Company Ltd | Households | 2021 |
| Welsh Luxury Hamper Company Ltd | Wholesale & retail | 2021 |
| Welsh Street Management Limited | Households | 1989 |
| Wendy Laverick Ltd | Arts & recreation | 2022 |
| Wentwood Consultancy Ltd | Professional & scientific | 2022 |
| Wesley Redman Ltd | Construction | 2024 |
| West Haulage Limited | Transport & logistics | 2015 |
| Westbourne Grove (Bristol) Management Limited | Households | 1984 |
| Wexalthim Ltd | Real estate | 2026 |
| Wherlock Property Consulting Limited | Households | 2025 |
| Whirlybirds Helicopters Ltd | Administrative & support | 2006 |
| White Capital Holding Ltd | Professional & scientific | 2026 |
| White Hart Carw Gwyn Limited | Arts & recreation | 1991 |
| White Intent Holdings Ltd | Real estate | 2019 |
| White Intent Properties Ltd | Real estate | 2017 |
| White Tree Property and Management Co. Ltd | Real estate | 2000 |
| Wiest Uropower Limited | Administrative & support | 2006 |
| Wild Service Films Limited | Information & communication | 2014 |