| T&L Supplements Ltd | Wholesale & retail | 2025 |
| T&R Building and Construction Ltd | Construction | 2024 |
| T-A-B Training Solutions Ltd | Professional & scientific | 2023 |
| TA Carpentry Ltd | Construction | 2021 |
| TA1 Trading Ltd | Wholesale & retail | 2023 |
| Tabernacle Studios Ltd | Information & communication | 2025 |
| Tablestack Ltd | Wholesale & retail | 2025 |
| Tackle & Bait Direct Limited | Wholesale & retail | 2021 |
| Taff and Thames Ltd | Professional & scientific | 2024 |
| Tagcure Limited | Wholesale & retail | 2025 |
| Tainton Property Developments Ltd | Real estate | 2024 |
| Taiso Academy of Gymnastics CIC | Arts & recreation | 2026 |
| Taiso Gymnastics Ltd | Arts & recreation | 2023 |
| Tan-Y-Rhiw Hydroelectric Limited | Energy | 2010 |
| Tankertech Limited | Energy | 2007 |
| Tapp and Bond (Bars) Ltd | Hospitality | 2018 |
| Taryn Bond Aesthetics & Skin Clinic Ltd | Other services | 2024 |
| Tawe Property Ltd | Construction | 2019 |
| Taxmate Online Accountants Limited | Professional & scientific | 2024 |
| Taylored Fitness and Nutrition Limited | Arts & recreation | 2025 |
| Tech Equips Ltd | Wholesale & retail | 2026 |
| Technician Assistant Limited | Professional & scientific | 2025 |
| Technological Excellence Ltd | Information & communication | 2016 |
| Tedxswansea Ltd | Administrative & support | 2021 |
| TEN 21 Bar and Bistro Ltd | Hospitality | 2024 |
| Tenderleaf Ltd | Agriculture & fishing | 2019 |
| Tenkaichi (SW) Ltd | Hospitality | 2005 |
| Tennant Canal Association CIC | Other services | 2022 |
| Terrain Living Ltd | Construction | 2026 |
| TFB Global Ltd | Professional & scientific | 2024 |
| That Doughnut Place Ltd | Manufacturing | 2020 |
| THE Accountant-C Suite Limited | Professional & scientific | 2025 |
| THE Accounts Department (Swansea) Limited | Administrative & support | 2010 |
| THE Angel Inn (Pontneathvaughan) Ltd | Hospitality | 2021 |
| THE Artisan PEN Company Limited | Arts & recreation | 2023 |
| THE Authentic Indian Ltd | Hospitality | 2024 |
| THE Beach Shack Limited | Hospitality | 2019 |
| THE Brickies (Cardiff) Ltd | Construction | 2021 |
| THE Business Venture Group Ltd | Financial services | 2023 |
| THE Care Professional Organisation Limited | Other services | 2016 |
| THE Cimla Funeral Home Limited | Other services | 2008 |
| THE Crossing Cafe Limited | Hospitality | 2024 |
| THE Cwrt Herbert Sports Association Ltd | Arts & recreation | 2016 |
| THE Cycle Academy Wales Limited | Education | 2013 |
| THE Digital Accessibility Centre Limited | Information & communication | 2010 |
| THE Draco Project CIC | Education | 2022 |
| THE Dulais Valley Coffee Co. Limited | Wholesale & retail | 2025 |
| THE Dyffryn Arms Ltd | Hospitality | 2019 |
| THE Fashion Phrontistery London Ltd | Education | 2021 |
| THE Finance Centre Limited | Financial services | 2025 |
| THE Glow Studio Hair and Beauty Limited | Other services | 2026 |
| THE Glow Training Academy Limited | Education | 2024 |
| THE Glyn Clydach Limited | Hospitality | 2023 |
| THE Good Nails Ltd | Other services | 2024 |
| THE Hart Group Automotive Ltd | Wholesale & retail | 2020 |
| THE Health Dispensary Ltd | Wholesale & retail | 2000 |
| THE Hive and Busy Bees Playcafe Ltd | Hospitality | 2023 |
| THE Jolly JAM JAR Ltd | Arts & recreation | 2025 |
| THE Keto Pro Ltd | Other services | 2018 |
| THE Krag Ltd | Construction | 2024 |
| THE Leather Fixer Ltd | Other services | 2025 |
| THE Lodge Workshop Ltd | Construction | 2023 |
| THE Mailing Company Limited | Information & communication | 2006 |
| THE Meat and Greet Co - Events Limited | Hospitality | 2019 |
| THE Meat and Greet Co. Ltd | Hospitality | 2017 |
| THE Mobility Wizard Ltd | Wholesale & retail | 2024 |
| THE Money Geeks Ltd | Financial services | 2018 |
| THE Music Shop (Neath) Ltd | Wholesale & retail | 2017 |
| THE Naissance Trading & Innovation Company Ltd | Wholesale & retail | 2005 |
| THE Neath Port Talbot Community Voluntary Service Limited | Administrative & support | 1997 |
| THE Neighbourhood Restaurant Ltd | Hospitality | 2025 |
| THE Not-So-Soggy Straw Company Ltd | Manufacturing | 2024 |
| THE Old Cockney Inn Limited | Hospitality | 2026 |
| THE Pamper Studio Limited | Other services | 2022 |
| THE Pen-Y-Cae Inn Limited | Hospitality | 2003 |
| THE Phoenix Post Limited | Education | 2015 |
| THE Plumbing and Heating Doctors Ltd | Construction | 2025 |
| THE POD Workshop Ltd | Construction | 2023 |
| THE Ranch Breakfast Bar and Grill Ltd | Hospitality | 2022 |
| THE Roaming Dome Ltd | Other services | 2025 |
| THE Rock and Fountain PUB Limited | Hospitality | 2019 |
| THE Rock PUB Ltd | Hospitality | 2025 |
| THE Self Defence Centre CIC | Arts & recreation | 2021 |
| THE Severn Lake Company Limited | Other services | 2003 |
| THE Social Counselling Collective Ltd | Health & social care | 2024 |
| THE Stage 8 Group Limited | Education | 2016 |
| THE Stage Y Llwyfan Limited | Arts & recreation | 2018 |
| THE Stand OUT Crowd Limited | Professional & scientific | 2016 |
| THE Strawberry Box Ltd | Hospitality | 2022 |
| THE Trade Centre Wales Group Limited | Financial services | 2018 |
| THE Unlimited Pathway C.I.C. | Information & communication | 2025 |
| THE Vine Inn (Old Bursledon) Ltd | Hospitality | 2018 |
| THE Welf Resolven Ltd | Hospitality | 2025 |
| THE Welsh ALL Blacks CIC | Arts & recreation | 2024 |
| THE Zall House Limited | Hospitality | 2018 |
| Theatr NA N'Og | Arts & recreation | 1984 |
| Think and Connect Digital Marketing Limited | Professional & scientific | 2025 |
| Third Sector Enterprises Neath Port Talbot Limited | Hospitality | 2009 |
| Thomas & SON Properties Ltd | Real estate | 2024 |
| Thomas Bard Advisory Ltd | Professional & scientific | 2023 |