| Smart Lead Strategies Ltd | Information & communication | 2025 |
| Smartmove Properties & Facilities Management Solutions Ltd | Households | 2025 |
| Smiling Valley Vale Ltd | Hospitality | 2026 |
| Snackeroo Ltd | Administrative & support | 2020 |
| Snap Fresh Limited | Administrative & support | 2025 |
| Sneeky Peek 4D Ltd | Health & social care | 2020 |
| Soiful Ltd | Hospitality | 2011 |
| Solar Helper Ltd | Professional & scientific | 2025 |
| Solar Made Simple Limited | Construction | 2026 |
| Solliden Limited | Transport & logistics | 2011 |
| Somerfords Automotive Ltd | Wholesale & retail | 2025 |
| SOS UK Holdings Ltd | Financial services | 2025 |
| South Wales Tree & Landscapes Ltd | Administrative & support | 2025 |
| Speculo Glass and Glazing Ltd | Construction | 2026 |
| Steelmen Rugby Limited | Arts & recreation | 2011 |
| STU Hill Construction Ltd | Construction | 2025 |
| Sumayarra Limited | Wholesale & retail | 2025 |
| Sycamore Legal Services Ltd | Professional & scientific | 2015 |
| Sycamore Property Damp Proofing Ltd | Construction | 2025 |
| Sycamore Property Maintenance Ltd | Construction | 2021 |
| Sycamore Rentals Ltd | Real estate | 2023 |
| Tantastic Port Talbot Limited | Other services | 2019 |
| Target Timber Systems Limited | Manufacturing | 2004 |
| Tatul Ltd | Wholesale & retail | 2021 |
| TCK Electrical and Mechanical Repairs Limited | Professional & scientific | 2015 |
| Tezzabelles Limited | Wholesale & retail | 2022 |
| THE 4-8 Group Limited | Financial services | 2020 |
| THE Badminton PUB Ltd | Hospitality | 2018 |
| THE Beaufort Theatre Limited | Arts & recreation | 2017 |
| THE Canvassing Company Ltd | Professional & scientific | 2023 |
| THE Carpet Cleaning Experts Ltd | Administrative & support | 2025 |
| THE Church Buying Ltd | Extraterritorial | 1997 |
| THE Collector Sector Limited | Wholesale & retail | 2022 |
| THE Every Day Plan Limited | Wholesale & retail | 2014 |
| THE Flower Cwtch Ltd | Wholesale & retail | 2020 |
| THE Hospice of the Valleys | Health & social care | 1986 |
| THE Nice Price Cake Company Limited | Wholesale & retail | 2012 |
| THE Pont-Y-Gof Playhouse Limited | Health & social care | 2020 |
| THE Posh Plaice Ltd | Hospitality | 2025 |
| THE Skin Sanctuary Clinic Ltd | Other services | 2025 |
| THE Vaping APE Coffee Shop Ltd | Hospitality | 2018 |
| THE Vault Collective Ltd | Wholesale & retail | 2020 |
| Theion Consulting Limited | Information & communication | 2026 |
| Theraccoon Limited | Information & communication | 2023 |
| Thermo Steady Solutions Limited | Construction | 2024 |
| Thomwellhomes Property Developments Ltd | Real estate | 2025 |
| Thousand Lake Ltd | Hospitality | 2025 |
| Three Ring Circus Arts Ltd | Arts & recreation | 2022 |
| THU Arts Collective CYF. | Education | 2022 |
| Thusan Services Ltd | Wholesale & retail | 2012 |
| THY Target Flourish Ltd | Health & social care | 2024 |
| THY Target Limited | Wholesale & retail | 2017 |
| Tigra Travel Limited | Transport & logistics | 2025 |
| Tillery Action for YOU Limited | Education | 2011 |
| Tilon Group Ltd | Financial services | 2024 |
| Tilon International Ltd | Manufacturing | 2024 |
| Time 2 Live Again Limited | Information & communication | 2025 |
| Tinkerbot Games Limited | Information & communication | 2016 |
| TJE Burkitt Investments Limited | Real estate | 2019 |
| TJE Landscaping & Building Services Ltd | Administrative & support | 2024 |
| TKL Consulting Ltd | Agriculture & fishing | 2018 |
| TLS Asset Management Ltd | Real estate | 2025 |
| TN SAI Limited | Wholesale & retail | 2023 |
| Tommie's Autos (Mots) Limited | Wholesale & retail | 2026 |
| Total Scaffolding Solutions Limited | Construction | 2020 |
| Train With Jack Limited | Arts & recreation | 2023 |
| Transom Marine Consultants Limited | Professional & scientific | 2015 |
| Trifecta Technology Services Ltd | Information & communication | 2019 |
| Trusting Hands Limited | Health & social care | 2004 |
| TWP Investing Ltd | Financial services | 2021 |
| TY Bryn Social Club Ltd | Hospitality | 2024 |
| TY Chwarae Glyncoed Limited | Health & social care | 2024 |
| Tyleryan Belles Sports Association Limited | Arts & recreation | 2019 |
| Typical Trees & Landscapes Ltd | Administrative & support | 2025 |
| Tyre Planet Ltd | Wholesale & retail | 2019 |
| Uplift Services Ltd | Construction | 2024 |
| Vale Barfitters Limited | Construction | 2016 |
| Vale Accident Repair Centre Limited | Wholesale & retail | 2018 |
| Vale Chip Shop Ltd | Hospitality | 2015 |
| Valley Food Services Ltd | Hospitality | 2019 |
| Valley Properties (SW) Ltd | Real estate | 2024 |
| Valley Telecommunications Ltd. | Information & communication | 2011 |
| Valleys Accounting Limited | Professional & scientific | 2020 |
| Valleys Concrete Repairs and Coatings Ltd | Construction | 2007 |
| Valleys Resin Bound Limited | Construction | 2021 |
| Valleys Spice Ltd | Hospitality | 2022 |
| Valleys Trade PVC Ltd | Construction | 2025 |
| Vaside Ltd | Real estate | 2019 |
| Vaulted Relics Trading Ltd | Wholesale & retail | 2026 |
| Victoria Anne Seamstressing Ltd | Wholesale & retail | 2025 |
| Victoria Financial Solutions Ltd. | Financial services | 2015 |
| Virtuoso Psychology Limited | Professional & scientific | 2025 |
| Vogue HR Ltd | Professional & scientific | 2018 |
| Volkz Ltd | Hospitality | 2026 |
| VT Matthews Properties Ltd | Construction | 2021 |
| VY Fast Foods Ltd | Hospitality | 2024 |
| W M Lawrence Civils Ltd | Construction | 2017 |
| Warrior Martial Arts & Boxing C.I.C. | Arts & recreation | 2020 |
| Wazir Contracts UK Ltd | Transport & logistics | 2025 |
| WE Axed the Agent Limited | Extraterritorial | 2009 |