| Saga Films Ltd | Professional & scientific | 2023 |
| Sandhu Venture Capital Holdings Ltd | Professional & scientific | 2025 |
| Seren Recruitment Ltd | Administrative & support | 2021 |
| Shamtam Ltd | Wholesale & retail | 2018 |
| Sharrock & Sharrock Limited | Professional & scientific | 2009 |
| Shawsec Ltd | Administrative & support | 2019 |
| Shoe Kingdom Limited | Wholesale & retail | 2015 |
| Sky Storm Limited | Construction | 2021 |
| Smeep Limited | Information & communication | 2023 |
| Solo Racking Ltd | Wholesale & retail | 2018 |
| Sophie Walters Ltd | Other services | 2020 |
| South Wales Building Consultancy Limited | Professional & scientific | 2025 |
| Specialist Services for Events Ltd | Professional & scientific | 2014 |
| Stad Craig DDU Management Company Limited | Households | 2024 |
| Steven Black Electricians Limited | Construction | 2014 |
| Studio 45 Limited | Information & communication | 2016 |
| Surf H2O Limited | Wholesale & retail | 2003 |
| Swansea Quality Lettings Limited | Real estate | 2017 |
| T Beynon Properties Limited | Real estate | 2026 |
| T3 Logistics Ltd | Wholesale & retail | 2023 |
| Tajmahal Indian Kidwelly Ltd | Hospitality | 2026 |
| Tanylan Holidays Ltd | Hospitality | 2021 |
| TD and S Services Limited | Manufacturing | 2020 |
| THE Aesthetic Skin Clinic Ltd | Other services | 2025 |
| THE APE LAB Ltd | Wholesale & retail | 2026 |
| Theukpadelcompany Ltd | Arts & recreation | 2025 |
| Three Rivers Fencing Ltd | Construction | 2024 |
| Tom's Dairies Ltd | Agriculture & fishing | 2022 |
| Top Stitched Wales Community Interest Company | Other services | 2024 |
| Treftadaeth Cydweli Heritage CIC | Arts & recreation | 2025 |
| Tresillian Properties Limited | Wholesale & retail | 2024 |
| Trimsaran Rugby Football Club Limited | Arts & recreation | 2018 |
| United Energy Assessors Ltd | Other services | 2009 |
| Vannam DNP Limited | Administrative & support | 2025 |
| VCD Consultancy Limited | Professional & scientific | 2016 |
| Viking (Hellstrom) Aviation Limited | Transport & logistics | 2000 |
| Vitadent Ltd | Health & social care | 2009 |
| WDS Water Design Services Ltd | Professional & scientific | 2024 |
| Wesgash Ltd | Construction | 2020 |
| West Court Limited | Professional & scientific | 2018 |
| West Wales Car Seat Specialist Ltd | Wholesale & retail | 2023 |
| Western Maintenance (Kidwelly) Ltd | Construction | 2016 |
| Willow Brook Independent Funeral Directors Limited | Other services | 2019 |
| WJC Management System Services Ltd | Professional & scientific | 2018 |
| Woodland Co-Op Ltd | Other services | 2002 |
| Woofddarog Manor Ltd | Hospitality | 2026 |
| Wornnottorn Ltd | Wholesale & retail | 2024 |
| WR Client Link Ltd | Other services | 2025 |
| WYN WYN Group Limited | Manufacturing | 2024 |
| WYN WYN Ltd | Manufacturing | 2015 |
| Yellow Dog Gallery Limited | Arts & recreation | 2015 |
| Ymchwil Tetrim Research CYF | Professional & scientific | 2024 |
| Zenith Build Limited | Construction | 2016 |