| THE Catnip Company Limited | Other services | 2014 |
| THE Coach and Horses (Abergavenny) Limited | Hospitality | 2026 |
| THE Coach and Horses Events (Abergavenny) Limited | Hospitality | 2026 |
| THE Crown at Pantygelli Limited | Hospitality | 2024 |
| THE Dugout Cafebar Ltd | Hospitality | 2024 |
| THE Elementary Corporation Ltd | Financial services | 2025 |
| THE Falconer Group Ltd | Hospitality | 2023 |
| THE Halfway (Tal-Y-Coed) Ltd | Hospitality | 2022 |
| THE Ignition Shed Ltd | Hospitality | 2025 |
| THE July Collective Limited | Wholesale & retail | 2021 |
| THE Little Treat Ltd. | Hospitality | 2016 |
| THE Melville Centre for the Arts Community Interest Company | Health & social care | 2016 |
| THE Monmouthshire Golf Club Trading Limited | Arts & recreation | 2016 |
| THE New Lawns Management Company Limited | Households | 1997 |
| THE Night Manager PM Ltd | Real estate | 2024 |
| THE Oak Frame Marquee Company Ltd | Administrative & support | 2019 |
| THE Old Lawns Management Company Limited | Real estate | 1997 |
| THE Oriental 888 Ltd. | Hospitality | 2016 |
| THE Peppermint Dreams Company Ltd. | Administrative & support | 2014 |
| THE Phoenix Risen CIC | Education | 2025 |
| THE Radical Tea Towel Company Ltd | Wholesale & retail | 2013 |
| THE Retreat Llanover Ltd | Wholesale & retail | 2024 |
| THE Socials ERA Ltd | Professional & scientific | 2024 |
| THE South Atlantic Medal Association (1982) (Sama 82) | Other services | 2007 |
| THE Sporting Hall of Fame Limited | Arts & recreation | 1997 |
| THE Strata Clinic Ltd | Health & social care | 2022 |
| THE Tithe Barn Community Wellbeing Cafe CIC | Hospitality | 2024 |
| THE Towpath Inn Limited | Hospitality | 2018 |
| THE Urban Gent Lounge Ltd | Other services | 2025 |
| THE Village Alive Trust | Other services | 2004 |
| THE Willows USK Ltd | Wholesale & retail | 2011 |
| THE Wool Croft Limited | Wholesale & retail | 2010 |
| Theatr Adlais CIC | Education | 2026 |
| Themedia.Agency Limited | Professional & scientific | 2022 |
| Thetrailertailors Ltd | Manufacturing | 2025 |
| Thomas&Brown Funeral Care Ltd | Other services | 2020 |
| Thompson Associates Ltd | Information & communication | 2026 |
| Three Counties Fluid Power Ltd | Wholesale & retail | 2020 |
| Three Mountains (Luxury) Retreats Limited | Real estate | 2024 |
| Time for Therapy Ltd | Other services | 2025 |
| Tiptoes Harrison Limited | Real estate | 2016 |
| TLS (Mina Road) Limited | Construction | 2015 |
| TLS (Risborough) Limited | Construction | 2020 |
| Tmesis Consulting Limited | Information & communication | 2013 |
| TO Property Limited | Real estate | 2018 |
| TOD Property Ltd | Real estate | 2024 |
| TOD123 Ltd | Financial services | 2024 |
| Toddi Limited | Health & social care | 2011 |
| Tollstone Ltd | Construction | 2020 |
| TOM Parr Limited | Information & communication | 2004 |
| Tomcait Investments Limited | Real estate | 2010 |
| Torfaen Limited | Transport & logistics | 2023 |
| Torques Products Limited | Wholesale & retail | 2010 |
| Town and Country Collections Limited | Professional & scientific | 2011 |
| Town and Country Surveyors Ltd | Professional & scientific | 2016 |
| TP Safety Services Ltd | Education | 2023 |
| Tradelink Connect Ltd | Construction | 2025 |
| Trading Days Limited | Wholesale & retail | 2002 |
| Traditional Homescaping BPC Limited | Construction | 2011 |
| Tranche Limited | Financial services | 2015 |
| Tread Clean Services Ltd | Administrative & support | 2015 |
| Treads and Trails Limited | Arts & recreation | 2009 |
| Trebencyn Park Management Limited | Real estate | 2002 |
| Treecare Consulting Limited | Agriculture & fishing | 2017 |
| Treelinks (Ingredients) Limited | Administrative & support | 2001 |
| Treescape Tree Services Limited | Agriculture & fishing | 2020 |
| Treffgarne Properties Limited | Real estate | 1979 |
| Tregare Turkeys Limited | Agriculture & fishing | 1991 |
| Trevyr Limited | Professional & scientific | 2020 |
| Triley Court Management Company Ltd | Households | 2016 |
| Triley Mill Management Company Limited | Households | 2006 |
| Triple EH Ltd | Information & communication | 2014 |
| Truepoint Surveys Limited | Administrative & support | 2015 |
| Trumper Holdings Limited | Financial services | 2018 |
| Tudors Building Supplies (Hereford) Limited | Wholesale & retail | 1992 |
| Twizzles Fish Bar Ltd | Hospitality | 2018 |
| TY Derlwyn Limited | Administrative & support | 2006 |
| TY Mawr Holiday Cottages Ltd | Hospitality | 2021 |
| Tyciant 2020 Ltd | Construction | 2020 |
| Tyddyn Y Coed Farm LLP | | 2025 |
| Tytan Villa Residents Association Limited | Households | 1987 |
| Ukcharge Ltd | Wholesale & retail | 2015 |
| Under the Oak Limited | Hospitality | 2018 |
| Under the Same Moon 22 Ltd | Wholesale & retail | 2023 |
| United Joinery Limited | Construction | 1975 |
| United Partners Ltd | Administrative & support | 2024 |
| United Recycled Aggregates Limited | Water & waste | 2009 |
| USK Valley Farm Limited | Agriculture & fishing | 2020 |
| Uskbridge Management Company Limited | Households | 1995 |
| Utie Ltd | Professional & scientific | 2026 |
| Utisage Limited | Professional & scientific | 2015 |
| V Cooney Limited | Health & social care | 2009 |
| V4 Build and Design Services Limited | Construction | 2017 |
| Valley Aggregates Ltd | Wholesale & retail | 2017 |
| Valley Connections & Utilities Ltd | Construction | 2020 |
| Valley Vineyards Limited | Wholesale & retail | 2009 |
| Valve Control Consulting Ltd | Other services | 2019 |
| Van Wolff Ltd | Arts & recreation | 2013 |
| Vanguard Locksmith Systems Ltd | Construction | 2025 |
| Vectisma Ltd | Financial services | 2011 |