| Supply 2 Location Wales Limited | Administrative & support | 2021 |
| Support@Qaplus.Co.Uk Ltd | Information & communication | 1990 |
| Sustainable Roots Limited | Professional & scientific | 2020 |
| SW Tyre Guys Ltd | Wholesale & retail | 2024 |
| Sycamore Carpentry & Building Limited | Construction | 2014 |
| Syma Diesel Service Ltd | Manufacturing | 2018 |
| T D Care Ltd | Health & social care | 2017 |
| T Knight Property Services Limited | Information & communication | 2018 |
| T&S Tyres and Servicing Limited | Wholesale & retail | 2025 |
| TAI Derw Developments Ltd | Construction | 2025 |
| TAI Gwyn Cyfyngedig | Real estate | 2021 |
| Tannorella Holdings Limited | Financial services | 2023 |
| Taxi Q Limited | Information & communication | 2013 |
| Team Shredz City Ltd | Arts & recreation | 2022 |
| Telcoforge Ltd | Information & communication | 2024 |
| Temporal Junction Limited | Information & communication | 2021 |
| Tensile Fabric Structures Limited | Construction | 2016 |
| Tensile Installations Ltd | Construction | 2015 |
| Tensile Solutions Ltd | Construction | 2010 |
| Tewdric Energy Holdco Ltd | Financial services | 2025 |
| Tewdric Energy Midco Ltd | Financial services | 2025 |
| Tewdric Ltd | Wholesale & retail | 2000 |
| Tewdric Renewable Energy Ltd | Energy | 2011 |
| TFL Care Limited | Health & social care | 2005 |
| That Media Group Ltd | Administrative & support | 2015 |
| That Wellness MUM Ltd | Information & communication | 2026 |
| That's Bang Tidy! Cleaning Ltd | Administrative & support | 2025 |
| THE Album Supply Co Limited | Information & communication | 2021 |
| THE Baguette Shop Ltd | Hospitality | 2022 |
| THE Beeches Caravan Park Ltd | Hospitality | 2003 |
| THE Black Rabbit Group Limited | Education | 2025 |
| THE Bull Bar & Grill Limited | Hospitality | 2025 |
| THE Congruent Community Ltd | Professional & scientific | 2018 |
| THE Contour Skin Clinic Ltd | Health & social care | 2015 |
| THE Creative Learning Group Limited | Education | 2024 |
| THE DAG Caldicot Ltd | Hospitality | 2023 |
| THE Dragonfly Caldicot Ltd | Hospitality | 2025 |
| THE Dreamworks Garden Company Limited | Administrative & support | 2014 |
| THE Film Business Limited | Information & communication | 2012 |
| THE Fit Life Collective Limited | Education | 2017 |
| THE Golf Shed Ltd | Extraterritorial | 2026 |
| THE Grove (Caldicot) Management Company Limited | Households | 2009 |
| THE Hair Court (Caldicot) Ltd | Other services | 2023 |
| THE Herstory Project C.I.C. | Wholesale & retail | 2023 |
| THE House Design and Build Limited | Professional & scientific | 2017 |
| THE House Design and Survey Limited | Professional & scientific | 2021 |
| THE IVY Jack Bar Ltd | Hospitality | 2024 |
| THE K. Watkins Hartley Sipp Ltd | Real estate | 2005 |
| THE Knot Media Ltd | Professional & scientific | 2022 |
| THE Limo People Limited | Administrative & support | 2003 |
| THE Meadows (Langland) Residents Company Limited | Households | 2022 |
| THE Menopause Network Ltd | Health & social care | 2024 |
| THE Monmouthshire Charcoal Company Ltd | Manufacturing | 2024 |
| THE New Artisan Training Company Ltd | Education | 2022 |
| THE Old School Food Engineer Ltd | Hospitality | 2010 |
| THE Orchards (Sampford Peverell) Residents Company Limited | Households | 2023 |
| THE Pantry (Monmouthshire) Ltd | Hospitality | 2020 |
| THE Parent's Companion Ltd | Other services | 2023 |
| THE Photobox Trailer Co. Ltd | Professional & scientific | 2025 |
| THE Portishead Clinic Ltd | Health & social care | 2023 |
| THE Really Handy Company Ltd | Transport & logistics | 2000 |
| THE Regenerative Farming Company Ltd | Agriculture & fishing | 2023 |
| THE Rock and Fountain Inn Ltd | Hospitality | 2025 |
| THE Rock and Fountain Penhow Ltd | Hospitality | 2020 |
| THE Supreme Military Order of the Temple of Jerusalem Ltd | Other services | 2000 |
| Thermaliner Limited | Real estate | 2009 |
| Thiqah Health Ltd | Health & social care | 2025 |
| Thrive Leadership Ltd | Professional & scientific | 2020 |
| Tipsy Librarian Limited | Manufacturing | 2025 |
| Titan Data Limited | Water & waste | 1993 |
| TL Haulage Ltd | Wholesale & retail | 2018 |
| Tocsa Ltd | Transport & logistics | 2018 |
| Toms Delivery Ltd | Other services | 2025 |
| Top of the Rock Investments Limited | Hospitality | 2023 |
| Top Third People Solutions Ltd | Information & communication | 2020 |
| Toylander Real Life Toys Ltd | Administrative & support | 2015 |
| TPM Surveys Ltd | Construction | 2024 |
| Trace Biomonitoring Ltd | Professional & scientific | 2023 |
| Treasure Bookkeeping Services Limited | Professional & scientific | 2024 |
| TRH Homes Limited | Construction | 2018 |
| TSJ Production Accounting Limited | Information & communication | 2024 |
| Tucan Records Ltd | Information & communication | 2023 |
| Two Rivers Financial Planning Limited | Financial services | 2004 |
| Twomlows Holdings Limited | Financial services | 2019 |
| Twomlows Limited | Professional & scientific | 2008 |
| UK Design Service Limited | Professional & scientific | 2020 |
| UK Reactive Ltd | Administrative & support | 2022 |
| Ultra Feet Ltd | Health & social care | 2024 |
| Ultrasound Technologies Limited | Manufacturing | 1991 |
| Un.Pk Ltd | Manufacturing | 2025 |
| Undy Motor Services Limited | Wholesale & retail | 2026 |
| UNI Student Services Limited | Education | 2016 |
| United Haven Properties Ltd | Real estate | 2025 |
| Valley Property Management Limited | Real estate | 2022 |
| Vargas Art Limited | Arts & recreation | 2023 |
| Vipah Ltd | Wholesale & retail | 2025 |
| Virgo Recruitment Ltd | Administrative & support | 2016 |
| Visule Limited | Professional & scientific | 2024 |
| VS Wine Limited | Wholesale & retail | 2021 |
| Warrender Services Limited | Professional & scientific | 2021 |