| Sunrise AM HR Ltd | Administrative & support | 2025 |
| SUP Travel Ltd | Administrative & support | 2022 |
| Supreme Roofing 4 YOU Ltd | Construction | 2025 |
| Sursham Moore Ltd | Wholesale & retail | 2025 |
| Sutherland Waters Ltd | Wholesale & retail | 2025 |
| SW20 Radio Ltd | Information & communication | 2021 |
| Sweets & Celebrations Ltd | Wholesale & retail | 2020 |
| Synadol Limited | Construction | 2025 |
| T & C Maintenance Services (Wales) Limited | Construction | 2011 |
| T & K Property Investors Limited | Real estate | 2019 |
| T & Sons Ltd | Hospitality | 2012 |
| T & T Shop Ltd | Wholesale & retail | 2022 |
| T & W Civils Ltd | Construction | 2025 |
| T G Carpentry and Building Ltd | Manufacturing | 2026 |
| T Jenkins Construction Ltd | Construction | 2021 |
| T W Building & Plastering Ltd | Construction | 2025 |
| T.Phillips&Son Ltd | Wholesale & retail | 2025 |
| T.U. Agencies Ltd. | Transport & logistics | 1993 |
| T.U. Properties Limited | Real estate | 2016 |
| T3 Estates Ltd | Real estate | 2023 |
| T70 Surveying Services Limited | Professional & scientific | 2025 |
| TAB Carpentry Ltd | Construction | 2014 |
| Talywain Auto Services Limited | Wholesale & retail | 1993 |
| Talywain Electrical Contractors Limited | | 1983 |
| Tamed Software Ltd | Information & communication | 2022 |
| Tarian Holdings Ltd | Financial services | 2025 |
| Tarian Logistics Solutions Ltd | Water & waste | 2019 |
| Tarian Services Ltd | Administrative & support | 2025 |
| Taryl Ltd | Transport & logistics | 2022 |
| Taylor Air Conditioning Ltd | Construction | 2022 |
| Taylor Made Renewable Energy Technologies Ltd | Energy | 2015 |
| Taylor Made Wales (1) Ltd | Wholesale & retail | 2021 |
| Taylor Made Wales (2) Ltd | Construction | 2021 |
| Taylor Made Wales (3) Ltd | Professional & scientific | 2022 |
| Taylor Made Wales (Steel) Limited | Energy | 2023 |
| Taylor Propertyy Ltd | Real estate | 2025 |
| TBG Brickwork and Building Services Ltd | Construction | 2024 |
| Technical Vapourz LLP | | 2018 |
| Teraform Limited | Information & communication | 2024 |
| Terraviso Ltd | Professional & scientific | 2026 |
| Terrence Allens Ltd | Wholesale & retail | 2025 |
| Teulu Properties Limited | Real estate | 2018 |
| That Fish GUY Limited | Hospitality | 2015 |
| That Street Food Ltd | Hospitality | 2017 |
| THE 1 Percent Club Limited | Education | 2025 |
| THE Abominable Book Club Ltd | Wholesale & retail | 2018 |
| THE Butchers Arms (Raglan) Limited | Hospitality | 2019 |
| THE Canddo Project CIC | Health & social care | 2021 |
| THE Cardy Boys Ltd | Wholesale & retail | 2025 |
| THE Face Boss Studio Limited | Other services | 2025 |
| THE Globe Inn Talywain Limited | Hospitality | 2009 |
| THE Goat Consultancy Group Ltd | Professional & scientific | 2023 |
| THE Green Compass Scheme Limited | Administrative & support | 2015 |
| THE Hair Shop (Pontypool) Limited | Other services | 2003 |
| THE Headboard Company Limited | Manufacturing | 2007 |
| THE Highway (New Inn) Management Company Limited | Real estate | 2016 |
| THE Horse & Jockey Pontypool Ltd | Hospitality | 2023 |
| THE Joinery Shop South Wales Ltd | Manufacturing | 2024 |
| THE Joshua Initiative CIC | Education | 2026 |
| THE Knoll Cattery Ltd | Agriculture & fishing | 2025 |
| THE Laundry HUT Ltd | Other services | 2025 |
| THE Lighthouse Inn Limited | Real estate | 1989 |
| THE London-Welsh Beer Company Ltd | Extraterritorial | 2009 |
| THE Mountain Song Revival CIC | Information & communication | 2025 |
| THE New Inn Abersychan Ltd | Hospitality | 2026 |
| THE OWL Centre Limited | Information & communication | 2011 |
| THE Race Sports and Social Club Limited | Hospitality | 2019 |
| THE Secret Garden (Wales) Limited | Wholesale & retail | 2012 |
| THE WIG and Beauty Company Ltd | Other services | 2025 |
| THE Woodlands (Residents) Management Company Limited | Households | 2018 |
| There for Care Services Ltd | Health & social care | 2016 |
| Thirty SIX Design Ltd | Professional & scientific | 2022 |
| Thornfield Pines Ltd | Wholesale & retail | 2025 |
| Thornton Rocker Ltd | Wholesale & retail | 2025 |
| TI Breizh Limited | Hospitality | 2012 |
| Time to Create Ltd | Manufacturing | 2015 |
| Tirpentwys Trails C.I.C. | Arts & recreation | 2021 |
| TIS US Limited | Information & communication | 2018 |
| TJN Air Ltd | Construction | 2022 |
| TJS Design Ltd | Professional & scientific | 2024 |
| TKY Ltd | Professional & scientific | 2023 |
| TL Landscapes (GB) Ltd | Administrative & support | 2025 |
| TM13 Limited | Administrative & support | 2015 |
| TM13 Properties Ltd | Real estate | 2019 |
| Tofgas Ltd | Construction | 2025 |
| Togs Centre | Arts & recreation | 2002 |
| TOM Shaw Photography Ltd | Professional & scientific | 2025 |
| Tombland Gate Ltd | Wholesale & retail | 2025 |
| Toms Dog Walking CYF | Health & social care | 2025 |
| Tony Locksmith Limited | Wholesale & retail | 2003 |
| Top Flight Homes Limited | Hospitality | 2007 |
| Topclad Services Ltd | Manufacturing | 2021 |
| Torfaen Citizens Advice Bureau | Other services | 2004 |
| Torfaen Museum Trust Limited | Arts & recreation | 1978 |
| Torfaen Partitions Limited | Construction | 2018 |
| Torfaen Property Developments Ltd | Construction | 2021 |
| Torfaen Property Rentals Ltd | Real estate | 2022 |
| Torfaen Talks CIC | Information & communication | 2021 |
| Torfaen Voluntary Alliance | Administrative & support | 2002 |
| Toronto Gardens Ltd | Wholesale & retail | 2025 |