| T Bartlett Consulting Ltd | Professional & scientific | 2019 |
| T D Tyre Recycling Ltd | Water & waste | 2010 |
| T G Jones Ltd | Real estate | 2024 |
| T P Carpentry and Building Limited | Construction | 2018 |
| T Pearson Consultancy Ltd | Administrative & support | 2021 |
| T S R a Limited | Agriculture & fishing | 2012 |
| Tacho MAN Limited | Transport & logistics | 2005 |
| Tafarn Y Cross Limited | Hospitality | 2025 |
| TAI Begw CYF | Real estate | 2025 |
| TAI TY FRY Cyfyngedig | Construction | 2004 |
| Talentree Limited | Administrative & support | 2025 |
| Talkworks Training & Development Limited | Wholesale & retail | 2013 |
| Tall Trees & Small Woods Arboricultural Services Limited | Agriculture & fishing | 2020 |
| Talog Country Retreat Ltd | Hospitality | 2020 |
| Tapered Roofing Systems Limited | Construction | 2006 |
| Target Sports Equipment Ltd | Arts & recreation | 2019 |
| Targeted Learning Support CIC | Education | 2024 |
| Tashana Ltd | Hospitality | 2023 |
| Tawel Limited | Other services | 2024 |
| Taylor Wind Services Ltd | Administrative & support | 2023 |
| Taylors' Law Associates Limited | Professional & scientific | 2024 |
| Tcbh Events Ltd | Agriculture & fishing | 2022 |
| TCE Construction Ltd | Construction | 2026 |
| TDM Building Services Ltd. | Construction | 2021 |
| Team Tristar (UK) Limited | Manufacturing | 2012 |
| Technologies for Good Ltd | Manufacturing | 2025 |
| Techpoint Trans L.P. | | 2018 |
| Tegarts CIC | Arts & recreation | 2025 |
| Tegethoff Design Ltd | Professional & scientific | 2023 |
| Tegfan Plant and Machinery Ltd | Wholesale & retail | 2019 |
| Tegg Plumbing Limited | Construction | 2026 |
| Teifi Blocks Limited | Manufacturing | 2017 |
| Teifi Health Ltd | Health & social care | 2023 |
| Teifi Kitchens Limited | Construction | 2016 |
| Teifi River View Limited | Real estate | 2025 |
| Tekktra Ltd | Information & communication | 2014 |
| Telesgopics CYF | Information & communication | 1999 |
| Tenby Ice Cream 1 Limited | Wholesale & retail | 2018 |
| Tenby Ice Cream 2 Limited | Wholesale & retail | 2018 |
| Terrem Limited | Construction | 2020 |
| Terry Thomas & Co Limited | Real estate | 2015 |
| Tetra SOL Ltd | Wholesale & retail | 2023 |
| Tetra Studios Ltd | Professional & scientific | 2018 |
| Teulu Services Limited | Construction | 2025 |
| Texcom Associates PC | | 2018 |
| TF Jones Limited | Health & social care | 2010 |
| Tfatc Ltd | Education | 2011 |
| TFG Services Limited | Construction | 2019 |
| THD (Tenby) Ltd | Real estate | 2025 |
| THE Accounting and Bookkeeping Company Ltd | Professional & scientific | 2015 |
| THE Anglo-American Book Company (Holdings) Limited | Professional & scientific | 2003 |
| THE Bevis Trust for Wildlife Management | Professional & scientific | 2015 |
| THE Big Smoke Barbecue and Smokehouse Limited | Hospitality | 2025 |
| THE Black Lion New Quay Limited | Hospitality | 2021 |
| THE Black OX Ltd | Hospitality | 2026 |
| THE Blue Property Maintenance Services Ltd | Real estate | 2017 |
| THE Butchers Arms Llanddarog Ltd | Hospitality | 2026 |
| THE Cadence Consultancy Group Limited | Real estate | 2025 |
| THE Canine Coach Dog Training Limited | Other services | 2025 |
| THE Ceramics Emporium Ltd | Wholesale & retail | 2021 |
| THE Colliers Arms Pwll Limited | Hospitality | 2025 |
| THE Corvus Inn Ltd | Hospitality | 2019 |
| THE Cothi Bridge Agricultural Society | Other services | 2005 |
| THE Cross Keys Inn Limited | Hospitality | 2018 |
| THE Daffodil Ceredigion Limited | Hospitality | 2013 |
| THE Dalesman Enterprise Ltd | Hospitality | 2024 |
| THE Dalesman Experience Ltd | Hospitality | 2019 |
| THE Dog House (UK) Limited | Other services | 1996 |
| THE Drone Centre Ltd | Professional & scientific | 2018 |
| THE Drovers Arms (Carmarthen) Limited | Hospitality | 2024 |
| THE Edgie Company Limited | Wholesale & retail | 2026 |
| THE Edible Garden Company Ltd | Agriculture & fishing | 2017 |
| THE Electric MAN Limited | Construction | 2003 |
| THE Falconry Heritage Trust | Arts & recreation | 2005 |
| THE Farmers Arms Ltd | Other services | 2022 |
| THE Ferryman Laugharne Limited | Hospitality | 2025 |
| THE Festival of Falconry | Arts & recreation | 2008 |
| THE First AID Training College Ltd | Education | 2000 |
| THE Flower Studio Carmarthen Ltd | Wholesale & retail | 2025 |
| THE Globe Laugharne Limited | Wholesale & retail | 2024 |
| THE Grapes Tavern Limited | Hospitality | 2019 |
| THE Great British Bird of Prey Centre Ltd | Arts & recreation | 2017 |
| THE Hideaway Tenby Ltd | Hospitality | 2018 |
| THE Home Rental Company Limited | Real estate | 2005 |
| THE House Surgeons Limited | Construction | 2025 |
| THE Hyve Gym Ltd | Arts & recreation | 2025 |
| THE Iron Yard Limited | Manufacturing | 2019 |
| THE Knox Group Ltd | Administrative & support | 2017 |
| THE Lanterns Tenby Ltd | Hospitality | 2025 |
| THE Laugharne Moorings Limited | Hospitality | 2022 |
| THE Little Boutique Hereford Limited | Real estate | 2025 |
| THE Luxe Edit Ltd | Other services | 2023 |
| THE Mansel Arms Limited | Hospitality | 2025 |
| THE Mill Cocktail Bar Limited | Hospitality | 2026 |
| THE Newme Lounge Limited | Other services | 2024 |
| THE Old TIN Works Cafe Ltd | Hospitality | 2024 |
| THE Porkie Blinders Breakfast and Grill Limited | Hospitality | 2024 |
| THE Quirky Dino Ltd. | Wholesale & retail | 2023 |
| THE Rawthey Programme Ltd | Health & social care | 2019 |
| THE Rawthey Project CIC | Health & social care | 2022 |