| Trevex Properties Ltd | Real estate | 2019 |
| Truebox Ltd | Wholesale & retail | 2012 |
| Trusted Car Parts Limited | Real estate | 2013 |
| Tudor Lewis Financial Planning Ltd | Administrative & support | 2026 |
| Tusk Properties Limited | Hospitality | 1982 |
| TY Bannau Limited | Professional & scientific | 2023 |
| TY Madoc Farm Ltd | Agriculture & fishing | 2018 |
| TY Mawr Lime Limited | Manufacturing | 1999 |
| TY Mynydd Consulting Limited | Administrative & support | 2022 |
| TÂN a MÔR Ltd | Hospitality | 2025 |
| UK Directions Education Services Ltd. | Education | 2014 |
| UK Hydroslides Limited | Manufacturing | 1991 |
| UK Vent Ltd | Construction | 2016 |
| Unique Solutions Limited | Professional & scientific | 1993 |
| United Kingdom Airsoft Retailers Association Ltd | Information & communication | 2025 |
| Universe GP Ltd | Professional & scientific | 2023 |
| USK Valley Herbs Limited | Agriculture & fishing | 2023 |
| USK Valley Roses Limited | Agriculture & fishing | 2019 |
| UV Care 222 Ltd | Wholesale & retail | 2021 |
| Valhalla Strength Hub Ltd | Wholesale & retail | 2025 |
| Van Dijk Brewing Ltd | Wholesale & retail | 2021 |
| Vanaja Limited | Health & social care | 2021 |
| Vantix Fitness Ltd | Wholesale & retail | 2025 |
| Velhopetrade Ltd | Wholesale & retail | 2021 |
| Velocity Fit Ltd | Arts & recreation | 2020 |
| Velocity Therapy Ltd | Other services | 2021 |
| Velogistics Limited | Manufacturing | 2020 |
| Velvacloud Ltd | Information & communication | 2026 |
| VFB Services Limited | Real estate | 2020 |
| Victual Tech Limited | Professional & scientific | 2017 |
| Vimmerfields Ltd | Hospitality | 2014 |
| Vintage KIT Limited | Professional & scientific | 2019 |
| Vulpes Capital Ltd | Financial services | 2021 |
| W D & S a Sheppard Limited | Transport & logistics | 2014 |
| W. J. George (Butchers) Limited | Wholesale & retail | 1963 |
| W.W. Bowen Limited | Construction | 2008 |
| Wainmynach Barns Limited | Households | 2009 |
| Wales and Border Harness Racing Ltd | Arts & recreation | 2020 |
| Walker Trading Ltd | Real estate | 2018 |
| Walled Garden Treberfydd Limited | Wholesale & retail | 2013 |
| Watts the Clothier (Builth) Limited | Real estate | 1951 |
| Watts,The Clothier(Brecon)Limited | Real estate | 1951 |
| We'Re That Studio Ltd | Administrative & support | 2022 |
| Wellsynergy Ltd | Other services | 2024 |
| Welsh Shearing Equipment Centre Limited | Manufacturing | 1986 |
| Welsh Shearing Equipment Limited | Manufacturing | 2012 |
| Wern Growth Services Ltd. | Agriculture & fishing | 2003 |
| Wern Watkin Leisure Ltd | Hospitality | 2019 |
| Westlake Renovation Ltd | Construction | 2025 |
| White Court Art Limited | Wholesale & retail | 2006 |
| Whitehouse Sennybridge Ltd | Hospitality | 2025 |
| WHY Solar Ltd | Construction | 2022 |
| Wild Child Brecon Beacons CIC | Education | 2025 |
| Wild Connections Ltd | Administrative & support | 2019 |
| Wildscape Surveys Ltd | Professional & scientific | 2022 |
| Willcompany Limited | Construction | 2025 |
| Williams Motors (Cwmddu) Limited | Transport & logistics | 1977 |
| Williams Properties (Brecon) Limited | Real estate | 2002 |
| Willows Day Care Brecon Ltd | Health & social care | 2023 |
| Winslow Adaptics Limited | Manufacturing | 1989 |
| WJJ Services Limited | Administrative & support | 2019 |
| Woolf Moto Limited | Wholesale & retail | 2026 |
| WW Automotive Repairs Ltd | Wholesale & retail | 2026 |
| WW Bowen Concrete Limited | Other services | 2023 |
| WYE Energy Group Ltd | Construction | 2024 |
| Wyebridgesolutions Limited | Professional & scientific | 2025 |
| Wyndham Watkins Limited | Construction | 2017 |
| Young's of Brecon Limited | Wholesale & retail | 2003 |
| Your People and Culture Partners Limited | Other services | 2022 |
| Zaplan Ltd | Real estate | 2018 |
| Zena Potter Ltd | Information & communication | 2018 |