| WIZ23 Limited | Professional & scientific | 2024 |
| Wizdat Limited | Information & communication | 2025 |
| WLI Limited | Construction | 2000 |
| WLL Properties Limited | Real estate | 2020 |
| WM Electrics Limited | Construction | 2014 |
| Wolfe Stamford Ltd | Real estate | 2025 |
| Wolverhampton DAB Ltd | Information & communication | 2022 |
| Wood-Ross Holdings Ltd | Real estate | 2023 |
| Woodlands Hire Limited | Construction | 2022 |
| Woodside and Bishop’S Properties Ltd | Real estate | 2026 |
| Woof & Ready Dog Grooming and Pet Services Ltd | Other services | 2022 |
| Woolpack Ventures LLP | | 2022 |
| Work in Progress Coaching Ltd | Professional & scientific | 2020 |
| World of Nature Ltd | Wholesale & retail | 2010 |
| Worthingtons Transport Ltd | Transport & logistics | 2010 |
| WYJ Consultants Ltd | Professional & scientific | 2011 |
| Wynnstay Fishing & Conservation Limited | Agriculture & fishing | 2006 |
| Xenon Software Hub Ltd | Information & communication | 2020 |
| Xigen-E Ltd | Information & communication | 2026 |
| Xiphos AI Limited | Information & communication | 2025 |
| XL Engineering Holdings Limited | Professional & scientific | 1990 |
| XL Engineering Trading Limited | Manufacturing | 2006 |
| XMW Trade Limited | Wholesale & retail | 2020 |
| Xylem Materia Limited | Professional & scientific | 2017 |
| Yedibeba Ltd | Transport & logistics | 2020 |
| Yellow Rose Associates Limited | Real estate | 2009 |
| YELLOW17 Ltd | Information & communication | 2013 |
| Yield Hosting Limited | Information & communication | 2025 |
| YIP Manchester Limited | Hospitality | 2021 |
| You-Spa Cheshire Limited | Other services | 2021 |
| Yumberry Limited | Wholesale & retail | 2024 |
| YUP Limited | Professional & scientific | 2018 |
| Z F Assets Limited | Real estate | 2016 |
| ZAN Holdings Limited | Financial services | 2019 |
| ZAN Parking | | 2011 |
| Zayne Poole Videography Limited | Information & communication | 2022 |
| ZEN Occupational Health Limited | Health & social care | 2016 |
| Zephyr Pure Hygienics Ltd | Health & social care | 2023 |
| ZH Valeting Limited | Administrative & support | 2023 |
| Zombie Vapes Limited | Wholesale & retail | 2017 |