| Victoria Mews Management (NO 2) Limited | Households | 1990 |
| Ville Property Ltd | Real estate | 2024 |
| Vintage Valley Ltd | Wholesale & retail | 2026 |
| Vinyl Graphics Online Ltd | Wholesale & retail | 2010 |
| VIP Cleaning & Maintenance Services Ltd | Administrative & support | 2023 |
| Vitality Community Leisure Ltd | Arts & recreation | 2016 |
| Viva Port Talbot Limited | Administrative & support | 2020 |
| W & C a Meibion Ltd | Transport & logistics | 2014 |
| W&W Environmental Solutions Ltd | Professional & scientific | 2025 |
| W. F. James & SON Limited | Financial services | 2025 |
| W.T. Mahoney Limited | Construction | 2013 |
| Waffle Town Ltd | Wholesale & retail | 2020 |
| Walkley-Witts Group Limited | Real estate | 2026 |
| Want SEO Ltd | Information & communication | 2021 |
| Washed 4U Ltd | Other services | 2012 |
| Wayne Duggan Fine Turf Supplies Ltd | Administrative & support | 2014 |
| Wayne Home Improvements Ltd | Construction | 2026 |
| Wbta Group Ltd | Financial services | 2026 |
| Wbta Marketing Ltd | Professional & scientific | 2026 |
| WD Global Stock Ltd | Wholesale & retail | 2023 |
| WE DO the Miles Ltd | Transport & logistics | 2016 |
| Wealthcare (1985) Ltd | Financial services | 2011 |
| Wealthcare (2025) Limited | Financial services | 2025 |
| Wearne Windows Limited | Construction | 2020 |
| Welco & SON Roofing & Building Limited | Construction | 2023 |
| Welco Construction and Services Limited | Construction | 2017 |
| Welding and Ancilliary Supply & Procurement Limited | Wholesale & retail | 1997 |
| Weldlec Limited | Manufacturing | 2003 |
| Wells Group of Companies Ltd | Professional & scientific | 2025 |
| West Contractors Limited | Construction | 2013 |
| Western Bio-Energy (Fuels) Limited | Wholesale & retail | 2004 |
| Western Bio-Energy Ltd | Energy | 2002 |
| Western Pace Limited | Health & social care | 2018 |
| Wfdk Food Ltd | Hospitality | 2023 |
| Wgjconsulting Limited | Professional & scientific | 2024 |
| What Wick Ltd | Financial services | 2026 |
| Whirlpool Launderette Limited | Administrative & support | 2006 |
| Whistlejacket Capital Limited | Real estate | 2024 |
| Whitelock Financial Ltd | Financial services | 2014 |
| Wilbarne Estates Ltd | Real estate | 2025 |
| Wilkins Brothers (Cymmer) Limited | Transport & logistics | 1967 |
| Willow Springs Spa Ltd | Other services | 2024 |
| Winfield Energy UK Ltd | Manufacturing | 2021 |
| Winfield UK - Operations and Technologies Limited | Manufacturing | 2025 |
| Wish Medical Aesthetics Ltd | Health & social care | 2021 |
| Wish Skin Clinic Ltd | Health & social care | 2019 |
| Wish Training Academy Ltd | Health & social care | 2021 |
| WKO PT Ltd | Arts & recreation | 2012 |
| Woodbridge Events Limited | Real estate | 2023 |
| Woodgate Brand Management Limited | Professional & scientific | 2005 |
| Woolyshepherd Ltd | Hospitality | 2025 |
| Work Based Training Agency Commercial Ltd | Education | 2019 |
| Work Based Training Agency Limited | Education | 2004 |
| Work Stress Limited | Extraterritorial | 2014 |
| Wps-Uk Ltd | Construction | 2020 |
| Wright Accommodation Limited | Hospitality | 2026 |
| Wwmd Consulting Ltd | Professional & scientific | 2018 |
| Xtraspicy Consulting Ltd | Professional & scientific | 2024 |
| Xylo Solutions Ltd | Construction | 2026 |
| YES (Kenfig Hill) Ltd | Hospitality | 2026 |
| Ymca Port Talbot Limited | Hospitality | 2022 |
| Ynys Park Sports Bar Ltd | Hospitality | 2024 |
| Ynysmond Road Ltd | Construction | 2022 |
| Yoke Session Limited | Households | 2016 |
| Your Chippy Ltd | Hospitality | 2026 |
| Your Robes Ltd | Wholesale & retail | 2024 |
| Youthful Essence Ltd | Other services | 2025 |
| Z Vape Centre Ltd | Wholesale & retail | 2026 |
| Zafran Express Neath Ltd | Hospitality | 2025 |
| Zafran Zests Ltd | Hospitality | 2009 |
| Zagor Limited | Wholesale & retail | 2018 |
| Zarsa Foods Limited | Hospitality | 2025 |
| Zeal Build Ltd | Construction | 2023 |
| Zeal Life Ltd | Construction | 2023 |
| Zeal Space Ltd | Construction | 2022 |
| Zender Media Ltd | Professional & scientific | 2023 |
| Zoom Food and Drink Delivery Co. Ltd | Transport & logistics | 2023 |
| ZRB Limited | Construction | 2023 |