| Workshops Group Ltd | Professional & scientific | 2022 |
| World Awareness for Children in Trauma CIC | Professional & scientific | 2021 |
| Wrights Garage Ltd | Administrative & support | 2020 |
| WTS Trading Limited | Information & communication | 2018 |
| Wylie Wyborn Limited | Health & social care | 2013 |
| Wyvern Machine Tools Limited | Manufacturing | 1990 |
| X-Clusive Competitions Ltd. | Other services | 2019 |
| X-Ray Limited | Health & social care | 2006 |
| Xcel Plant & Construction Ltd | Construction | 2023 |
| Xpon Wireless Ltd | Administrative & support | 2013 |
| YA Skin & Hair Clinic Limited | Health & social care | 2025 |
| Yacht Boys Limited | Manufacturing | 2014 |
| Yary Ltd | Health & social care | 2025 |
| YNB Properties Limited | Real estate | 2022 |
| Your Local Fresh Ltd | Wholesale & retail | 2022 |
| Your Office in China Limited | Extraterritorial | 2011 |
| Your True Services Limited | Health & social care | 2024 |
| YRA Imaging Ltd | Health & social care | 2024 |
| Yura Corporation (UK) Limited | Transport & logistics | 2019 |
| Zardina Ltd | Wholesale & retail | 2013 |
| ZB Futures Limited | Professional & scientific | 2024 |
| Zenith Surgical Care Limited | Health & social care | 2021 |
| Zentrovolt Ltd | Construction | 2010 |
| Zero SIX Brew Co Ltd | Manufacturing | 2021 |
| Ziada Scan Ltd | Health & social care | 2023 |
| Ziggy Property Development Ltd | Real estate | 2024 |
| Zoe's Hair Studio Limited | Other services | 2010 |
| Zonal Fire Services Limited | Construction | 2006 |
| Zood Limited | Administrative & support | 2017 |
| Zoom Buzz Limited | Information & communication | 2019 |
| Zooom Holdings (UK) Limited | Professional & scientific | 2003 |
| Zortech Air Conditioning Limited | Construction | 2023 |