| Taff Homes Limited | Real estate | 2006 |
| Taff Investments Limited | Real estate | 1997 |
| Taff Service Centre Ltd | Wholesale & retail | 2024 |
| Taff Trail Townhouse Ltd | Hospitality | 2024 |
| Taff Tyres Limited | Wholesale & retail | 2012 |
| Taff Vale Practice Properties Limited | Real estate | 2014 |
| Taha's Accommodation Limited | Hospitality | 2019 |
| Taha's Ltd | Hospitality | 2000 |
| TAI Heulwen C.I.C. | Health & social care | 2024 |
| TAI Newydd Lease Holders Ltd | Real estate | 2016 |
| Tailored Management (UK) Ltd | Professional & scientific | 2014 |
| Taini Law Limited | Administrative & support | 2025 |
| Taini Property Ltd | Real estate | 2018 |
| Tajmahall Ltd | Other services | 2018 |
| Talent HR Consultancy Limited | Professional & scientific | 2015 |
| Talgwen Properties Limited | Real estate | 2026 |
| TAN Fire & Electrical Ltd | Construction | 2020 |
| TAN Y Ddraig Limited | Construction | 2018 |
| Tanlink UK Limited | Wholesale & retail | 2024 |
| Tanning and Beauty SW Limited | Other services | 2024 |
| Tantastic Bridgend Limited | Other services | 2017 |
| Tantastic Brynmawr Limited | Other services | 2016 |
| Tantastic Caldicott Limited | Other services | 2024 |
| Tantastic Pontypridd Limited | Other services | 2016 |
| Tantastic Stafford Limited | Other services | 2024 |
| Tantastic Warehouse Limited | Other services | 2021 |
| Tasmanian Devil Limited | Information & communication | 2018 |
| Taste of Bengal Broadway Ltd | Hospitality | 2024 |
| Taxi Corp Ltd | Transport & logistics | 2019 |
| Taylor Made Property Assessor Ltd | Professional & scientific | 2023 |
| Taylor'D Construction Limited | Real estate | 2020 |
| Taylored Financial Planning Ltd | Financial services | 2005 |
| Taymec Cleaning Systems Limited | Manufacturing | 1992 |
| TC Chester Limited | Hospitality | 2024 |
| Tea Tropical Ltd | Hospitality | 2025 |
| Tech Consulting Limited | Other services | 2020 |
| TEG Care Cymru Limited | Health & social care | 2025 |
| Tellus Arch Ltd | Professional & scientific | 2024 |
| Tellus Construction Ltd | Construction | 2025 |
| Telos Simulation CYF | Information & communication | 2025 |
| Temilon Limited | Health & social care | 2025 |
| Tenby Building Ltd | Construction | 2022 |
| Teppa P Innovation Plus (UK) Co., Ltd | Wholesale & retail | 2024 |
| Terra Nova Dwellings Ltd | Financial services | 2025 |
| Tessenderlo Holding UK Limited | Professional & scientific | 1998 |
| Tfbp Holdings Limited | Financial services | 2024 |
| Tfbp Limited | Arts & recreation | 2017 |
| TFW Fibre Ltd | Information & communication | 2024 |
| TFW Innovation Services Limited | Transport & logistics | 2020 |
| TG Asset Management Ltd | Real estate | 2022 |
| Thackeray D.D. Ltd | Hospitality | 2026 |
| Thai Glow Therapy and Waxing Limited | Other services | 2016 |
| Thai Massage & Reiki Healing Center Ltd. | Other services | 2021 |
| That Social Media Girl Ltd | Information & communication | 2020 |
| THE 86 Store Limited | Wholesale & retail | 2020 |
| THE Aesthetic Clinic by LIZ Limited | Other services | 2026 |
| THE Aisle Planner Limited | Administrative & support | 2026 |
| THE Alfred Inn Limited | Hospitality | 2025 |
| THE Aloud Charity | Arts & recreation | 2012 |
| THE Alphabet Tree Limited | Education | 2003 |
| THE AOB Group Limited | Professional & scientific | 2008 |
| THE Atlantic (South Beach) Tenby Limited | Hospitality | 2021 |
| THE AV Studio Integration Ltd | Information & communication | 2023 |
| THE Beehive Group Limited | Information & communication | 2021 |
| THE Bullseye Lounge Ltd | Hospitality | 2026 |
| THE Bush Inn Limited | Hospitality | 2003 |
| THE Cider & Perry Company (Wales) Ltd | Hospitality | 2014 |
| THE Coke's Ltd | Hospitality | 2025 |
| THE Consortium for Creativity in the Community for Health and Well-Being Ltd | Health & social care | 2022 |
| THE Construction Club Cambria Ltd | Other services | 2025 |
| THE Counting Shed CYF | Professional & scientific | 2022 |
| THE Court Royal Convalescent Home Limited | Wholesale & retail | 1998 |
| THE Croquet Consulting Limited | Professional & scientific | 2025 |
| THE CRW Group Limited | Financial services | 2024 |
| THE Dress & I CYF. | Wholesale & retail | 2023 |
| THE Farmers Arms Church Village Limited | Hospitality | 2022 |
| THE Flooring Studio (South Wales) Ltd | Wholesale & retail | 2021 |
| THE Flowerpot Pontyclun Ltd | Wholesale & retail | 2016 |
| THE Golwg Gwendraeth Residents Management Company Limited | Households | 2023 |
| THE Groggshop Limited | Wholesale & retail | 2013 |
| THE Groomers Beddau Limited | Other services | 2019 |
| THE Home Improve MEN Ltd | Construction | 2022 |
| THE Hub (Wales) Limited | Administrative & support | 2014 |
| THE Hummming Bird Ltd | Information & communication | 2023 |
| THE Insights Loop Limited | Professional & scientific | 2025 |
| THE Kraft Kabin Limited | Wholesale & retail | 2017 |
| THE Lamb Inn (Hirwaun) Ltd | Hospitality | 2026 |
| THE Learning Canopy Limited | Education | 2025 |
| THE Lemon Tree Botanicals Limited | Hospitality | 2018 |
| THE Little Blazer Company Limited | Manufacturing | 2021 |
| THE MAT Academy Ltd | Arts & recreation | 2018 |
| THE NO Coach Ltd | Professional & scientific | 2020 |
| THE OFF Grid Cat Ltd | Wholesale & retail | 2023 |
| THE PUP Hub Ltd | Other services | 2022 |
| THE Rickards Arms Ltd | Hospitality | 2024 |
| THE Salon Porth Limited | Other services | 2018 |
| THE Shepherds Arms Ltd | Hospitality | 2015 |
| THE Ship Inn Bar and Restaurant Limited | Hospitality | 2022 |
| THE Spicketts Battrick Trust Limited | Professional & scientific | 2024 |
| THE TNT Hub Ltd | Arts & recreation | 2025 |