| Waresworld Limited | Wholesale & retail | 2023 |
| Warrior Spirit Martial Arts Deganwy Ltd | Arts & recreation | 2025 |
| Watertight Building & Roofing Limited | Construction | 2020 |
| WD & Jubilee Joinery Ltd | Construction | 2025 |
| WE ARE Oooty Ltd | Manufacturing | 2025 |
| Welsh Highland Light Railway Limited | Other services | 1996 |
| Welshot Imaging Ltd | Arts & recreation | 2008 |
| Welshot Limited | Professional & scientific | 2020 |
| Wendy Dearden Ltd | Professional & scientific | 2018 |
| Western Asset Finance Ltd | Financial services | 1999 |
| WG Wind Limited | Professional & scientific | 2026 |
| Wheel Restore Limited | Wholesale & retail | 2014 |
| Where IS the Love Ltd | Wholesale & retail | 2019 |
| White Portrait Baby Limited | Professional & scientific | 2025 |
| White Tower (Llandudno) Ltd | Hospitality | 2022 |
| White Tower Holiday Park Limited | Hospitality | 2004 |
| Whitehouse Leisure Park Limited | Hospitality | 2006 |
| Whitetower 2 Limited | Hospitality | 2025 |
| Whizzbang TV Limited | Information & communication | 2001 |
| Wicked Gaming Ltd | Manufacturing | 2024 |
| Wicked Melts Ltd | Manufacturing | 2024 |
| Wifi Wales Communications Ltd | Information & communication | 2017 |
| Wigzell Electrical Contractors Ltd | Construction | 2009 |
| Wilby Lane Ltd | Wholesale & retail | 2025 |
| Wild Horse Brewing Company Limited | Manufacturing | 2014 |
| Williams Petrophysics Limited | Mining & quarrying | 2026 |
| Williamson Medical Limited | Health & social care | 2025 |
| Wilson Spirit Ltd | Administrative & support | 2017 |
| Wilsons Lettings Limited | Real estate | 2018 |
| Windog Limited | Professional & scientific | 2010 |
| Wine Bank of Conwy Limited | Hospitality | 2014 |
| Witches Tea Ltd | Wholesale & retail | 2022 |
| Wizarding Boutique Ltd | Wholesale & retail | 2019 |
| WJL Lettings Ltd | Real estate | 2025 |
| Wobbli Moggi Ltd | Wholesale & retail | 2025 |
| Wolfenden Engineering Limited | Professional & scientific | 2020 |
| Wood Bank Apartments Ltd. | Real estate | 2003 |
| WP Care Ltd | Health & social care | 2010 |
| WPC Food Limited | Hospitality | 2025 |
| WUS Chinese Restaraunt Limited | Hospitality | 2026 |
| Yeung Sing Limited | Hospitality | 2021 |
| YEW Tree Wealth Management Ltd | Financial services | 2018 |
| Ynni Mynydd Bach LLP | | 2008 |
| York House (Llandudno) Limited | Households | 2010 |
| You'Re Gorgeous Handmade Soap Limited | Manufacturing | 2010 |
| Your Online Doctor Limited | Hospitality | 2020 |
| Your Tourism Community Ltd | Information & communication | 2009 |
| Yu-Hughes Homes Ltd | Real estate | 2020 |
| Z Studio Beauty Salon Limited | Other services | 2025 |
| Zombie Dog Films Ltd | Administrative & support | 2011 |