| Salt Road Logistics Ltd | Transport & logistics | 2026 |
| Scale UP Consultancy Ltd | Professional & scientific | 2025 |
| Self Build Experts Ltd | Professional & scientific | 2025 |
| Shabana Logistic Ltd | Transport & logistics | 2026 |
| Shapla Attire Ltd | Wholesale & retail | 2026 |
| Shoplinda Ltd | Wholesale & retail | 2021 |
| Showautoclinic Ltd | Professional & scientific | 2026 |
| SKN Haus Ltd | Other services | 2026 |
| Smart Switch (Swansea) Ltd | Administrative & support | 2026 |
| Smoke Cartel Ltd | Hospitality | 2026 |
| Snaple Point Ltd | Wholesale & retail | 2026 |
| Sodpropery Ltd | Real estate | 2025 |
| Soson Support Ltd | Health & social care | 2026 |
| Soulergy Ltd | Professional & scientific | 2026 |
| Sports Holistic Treatment Ltd | Other services | 2026 |
| Srhn Trading Ltd | Wholesale & retail | 2021 |
| Srtr Ltd | Administrative & support | 2026 |
| SSW Trading Ltd | Wholesale & retail | 2026 |
| Stackerz Clydach Ltd | Hospitality | 2025 |
| Stackerz Morriston Ltd | Hospitality | 2025 |
| Staples-Stubbs Rentals Ltd | Hospitality | 2025 |
| Stark Security Ltd | Transport & logistics | 2025 |
| Supported & Safe Ltd | Health & social care | 2024 |
| Swanhub Ltd | Wholesale & retail | 2026 |
| Swans Recovery Ltd | Transport & logistics | 2026 |
| Swansea Spartans CC Ltd | Arts & recreation | 2026 |
| Swansea Spiders Ltd | Wholesale & retail | 2026 |
| Sweet Atoms UK Ltd | Professional & scientific | 2025 |
| Tattered Flag Studios Ltd | Information & communication | 2024 |
| Tawe Distribution Ltd | Wholesale & retail | 2026 |
| Teamotoole Ltd | Manufacturing | 2025 |
| Teleco Ltd | Information & communication | 2025 |
| TENDAI2TAFADZWA1 Limited | Health & social care | 2023 |
| THE Creators Playground Ltd | Professional & scientific | 2026 |
| THE Family and Therapy Wellbeing Clinic Ltd | Health & social care | 2024 |
| THE Fuel Doctor 247: Ltd | Wholesale & retail | 2026 |
| THE Gym Hub Ltd | Health & social care | 2025 |
| TIN FOX Ltd | Arts & recreation | 2026 |
| Tolzini Cleaning Services Ltd | Administrative & support | 2026 |
| Top Tier Tees Ltd | Manufacturing | 2023 |
| Torquato Partners Ltd | Real estate | 2026 |
| TP Interactive Ltd | Professional & scientific | 2026 |
| Trex Fitness Ltd | Manufacturing | 2024 |
| TWS the Window Shop Ltd | Construction | 2025 |
| TY Glas Ltd | Real estate | 2025 |
| Ultra Clean Cleaning Specialists Ltd | Administrative & support | 2025 |
| Valley Roofing Supplies Ltd | Wholesale & retail | 2025 |
| Vantage Concepts Ltd | Transport & logistics | 2026 |
| VSP Property Ltd | Real estate | 2025 |
| Vuall Ltd | Information & communication | 2025 |
| Warehouse Overseas Property Limited | Arts & recreation | 2022 |
| Way Business Ltd | Professional & scientific | 2025 |
| Weobley Castle Gower CYF | Wholesale & retail | 2020 |
| Wise Services Ltd | Wholesale & retail | 2025 |
| Wsat Ltd | Professional & scientific | 2026 |
| Ynys Electrical Services Ltd | Manufacturing | 2026 |
| Z&A Consultancy Limited | Professional & scientific | 2025 |
| Zagros Global Ltd | Wholesale & retail | 2026 |
| Zak-Ari Stories Limited | Information & communication | 2025 |
| Zenith MOTOR1 Ltd | Wholesale & retail | 2025 |
| Zyntraq Ltd | Professional & scientific | 2025 |