| Trade Vehicles Collections & Deliveries Limited | Wholesale & retail | 2023 |
| Trail Projects Limited | Administrative & support | 2022 |
| Trealy Limited | Education | 2011 |
| Trefurn Asset Services Ltd | Administrative & support | 2021 |
| Trefurn Limited | Manufacturing | 2013 |
| Tregagle Consulting Limited | Professional & scientific | 2015 |
| Tri-Wall Chesterfield Limited | Manufacturing | 1996 |
| Tri-Wall Manchester Limited | Administrative & support | 2015 |
| Tri-Wall North East Limited | Manufacturing | 1953 |
| Tri-Wall Swansea Limited | Manufacturing | 1937 |
| Tri-Wall UK Limited | Manufacturing | 2012 |
| Tri-Wall West Midlands Limited | Manufacturing | 2015 |
| Trigate Holdings Limited | Real estate | 1996 |
| TRS Legal Costs Limited | Professional & scientific | 2010 |
| TRZ Consultancy Ltd | Professional & scientific | 2024 |
| Tuesday Roberts Limited | Wholesale & retail | 2021 |
| Tugwells Properties Ltd | Real estate | 2025 |
| Twentyman Talks Limited | Information & communication | 2023 |
| Twin Fish Pictures Ltd | Information & communication | 2011 |
| Twisted EYE Ltd | Manufacturing | 2017 |
| Two Turtles Ltd | Health & social care | 2014 |
| UK Property Lawyers Ltd | Professional & scientific | 2023 |
| Ultra States Ltd | Professional & scientific | 2024 |
| Unit 6 Automotive Limited | Wholesale & retail | 2024 |
| United Commercial Finance Ltd | Financial services | 2016 |
| United Kingdom Educational Experience Ltd | Education | 2019 |
| United Trades (Monmouth) Limited | Construction | 2022 |
| Unlimited Access Ltd | Construction | 2017 |
| Unplugged Campers Limited | Hospitality | 2025 |
| UP the Reds Ltd | Wholesale & retail | 2024 |
| Upper House Farm Holdings Ltd | Information & communication | 2020 |
| USK Developments Ltd | Construction | 2016 |
| USK Valley Handy Couple LP | | 2022 |
| V1P Events Ltd | Administrative & support | 2023 |
| Vanessa-Leigh Ltd | Health & social care | 2021 |
| Vassall Investments Limited | Construction | 1961 |
| Vertical Farming Group Ltd | Agriculture & fishing | 2021 |
| VFM Meat Superstore Limited | Other services | 2013 |
| VG Contract Services Limited | Professional & scientific | 2019 |
| Village Tyres 2020 Limited | Administrative & support | 2020 |
| Vitesse Investments Limited | Real estate | 1996 |
| Vividly Human Limited | Professional & scientific | 2025 |
| VKG Consulting Ltd | Professional & scientific | 2009 |
| Vodaclean Ltd | Administrative & support | 2025 |
| Vulpine Secure Limited | Professional & scientific | 2025 |
| Warfighter Digital Ltd | Information & communication | 2022 |
| Warner's Properties Limited | Wholesale & retail | 2020 |
| Watchhouse Limited | Construction | 2012 |
| Waterfall Healthcare Limited | Manufacturing | 2024 |
| Watery News Ltd | Professional & scientific | 2021 |
| Watkins Engineering Ltd | Professional & scientific | 1953 |
| Weald Motor Club Ltd. | Arts & recreation | 1993 |
| Wells Plumbing Services Limited | Construction | 2026 |
| Welsh Cake HUT Limited | Hospitality | 2024 |
| Welsh Roots Limited | Administrative & support | 2026 |
| Wern Granary Ltd | Real estate | 2023 |
| Westmac Canine Therapies Ltd | Administrative & support | 2016 |
| Weststride Limited | Transport & logistics | 1991 |
| WHB Associates Limited | Information & communication | 2023 |
| Whimpossible Ltd | Professional & scientific | 2018 |
| Whitchurch MOT Centre Limited | Wholesale & retail | 2011 |
| Whitecross Consultants Ltd | Professional & scientific | 2016 |
| Wild Grange Farm Ltd | Hospitality | 2024 |
| Wild Meadow Floral Limited | Wholesale & retail | 2026 |
| Wild Nature Based Occupational Therapy Ltd | Education | 2022 |
| Wild Wind Properties Limited | Real estate | 2012 |
| Williams Dental Care Ltd | Health & social care | 2022 |
| Willow & Wood Ltd | Manufacturing | 2023 |
| Wintle Organs (Tuning) Limited | Arts & recreation | 2002 |
| Wiseheart Limited | Professional & scientific | 2004 |
| Wiseman Aviation Limited | Manufacturing | 2024 |
| Wizzo Tech Limited | Information & communication | 2016 |
| Woolly Monmouth Ltd | Real estate | 2021 |
| Worth Consulting Ltd | Education | 1996 |
| Worth Learning Limited | Education | 2014 |
| Wperfumery Limited | Manufacturing | 2025 |
| Wyastone Estate Limited | Real estate | 2001 |
| WYE Homes Limited | Construction | 1999 |
| WYE Mountain Biking Limited | Education | 2018 |
| WYE Security Solutions Limited | Administrative & support | 2016 |
| WYE Valley Accountants Ltd | Professional & scientific | 2025 |
| WYE Valley Arts Centre Ltd | Education | 1995 |
| WYE Valley Country Store Ltd | Wholesale & retail | 2000 |
| WYE Valley Home Care Limited | Health & social care | 2025 |
| WYE Valley Sports Therapy Ltd | Other services | 2021 |
| WYE Valley Vegan Ltd | Wholesale & retail | 2019 |
| Wyefield Healthcare Limited | Health & social care | 2023 |
| Wyefield Windows & Doors Limited | Construction | 2022 |
| Wyevern Properties Ltd | Real estate | 2026 |
| Your Home Furnishings Ltd | Wholesale & retail | 2023 |
| Yunni IQ Ltd | Energy | 2013 |
| Z Secrets Ltd | Manufacturing | 2023 |
| Zelda Locums Limited | Health & social care | 2015 |
| Zenovia Limited | Real estate | 2018 |
| ZIP Zinc Therapeutics Limited | Health & social care | 2017 |