| Wesaal Ltd | Wholesale & retail | 2021 |
| West Moorland 220 Limited | Financial services | 2021 |
| West Moorland 221 Limited | Financial services | 2021 |
| Western Rich Limited | Transport & logistics | 2025 |
| Westmead Property Company Ltd | Real estate | 2006 |
| Westminster North West Limited | Real estate | 2025 |
| Westnell Properties Limited | Real estate | 2017 |
| Westpennant Limited | Real estate | 1967 |
| WH Surfacing Ltd | Construction | 2025 |
| Whalley's Services Ltd | Energy | 2018 |
| Wheeldon Consulting Ltd | Professional & scientific | 2025 |
| Where Next Ltd | Wholesale & retail | 2022 |
| White HUT Ltd | Information & communication | 2013 |
| Whitegate Boarding Kennels Ltd | Other services | 2014 |
| Whyatt Electrical Ltd | Construction | 2009 |
| Wild Entry Ltd | Information & communication | 2026 |
| Wildline Adventures Ltd | Administrative & support | 2025 |
| Wilds Cards Limited | Wholesale & retail | 2010 |
| Wilkinson & SON Property Developers Ltd | Construction | 2021 |
| William Calvert Limited | Extraterritorial | 2024 |
| William MAY (Ashton) Limited | Real estate | 1960 |
| Williams Property & Asset Management Ltd | Real estate | 2025 |
| Williams Tyre & Autocare Ltd | Wholesale & retail | 2011 |
| Williamsg Limited | Wholesale & retail | 2025 |
| Willow Vale Electronics Limited | Manufacturing | 2023 |
| Wilmslow Building Co Ltd | Construction | 1998 |
| Wilson Automotive Repairs Ltd | Wholesale & retail | 2020 |
| Wilson Brook Court Management Limited | Households | 2009 |
| Windmill Buildings Limited | Real estate | 2019 |
| Windmill Road 64 Limited | Real estate | 2019 |
| Windsro Limited | Real estate | 2016 |
| Winro Holdings Ltd | Financial services | 2016 |
| Wisecoates Transport Limited | Real estate | 1966 |
| Witzend Services Limited | Professional & scientific | 2002 |
| WJM Fibre Limited | Information & communication | 2023 |
| Wolf Rock Construction Limited | Construction | 2019 |
| Wood's Property Maintenance Ltd | Construction | 2019 |
| Woodaura Carpentry Ltd | Construction | 2026 |
| Woodworkers Bespoke Joinery Ltd | Manufacturing | 2013 |
| Woozel Retail Limited | Wholesale & retail | 2020 |
| Wotmix Limited | Manufacturing | 2011 |
| Wroughtech Engineering Ltd | Manufacturing | 2011 |
| Wych Property Lettings Ltd | Real estate | 2021 |
| Wyndham Apartments Limited | Real estate | 2019 |
| Wyndham Buildings Limited | Real estate | 2019 |
| X-L Technologies UK Limited | Professional & scientific | 2002 |
| XD Designs Ltd | Professional & scientific | 2025 |
| XO Radio Ltd | Information & communication | 2024 |
| XPC 1 Ltd | Wholesale & retail | 2020 |
| XS Direct Ltd | Extraterritorial | 2024 |
| Xylio Ltd | Information & communication | 2026 |
| Yaqub Property Group Limited | Real estate | 2024 |
| Yassir Sharief Limited | Health & social care | 2011 |
| Yebe Ltd | Wholesale & retail | 2024 |
| Yolymark Ltd | Professional & scientific | 2020 |
| Yomkem Ltd | Professional & scientific | 2016 |
| Yorda's Kitchen Ltd | Hospitality | 2020 |
| York Montessori Nursery Ltd | Health & social care | 1995 |
| York Road Developments Ltd | Construction | 2010 |
| Your Next Motor MCR Ltd | Wholesale & retail | 2026 |
| Yuanxi Limited | Wholesale & retail | 2024 |
| Z.T. Property Company Limited | Real estate | 2007 |
| ZEDCO586 Ltd | Wholesale & retail | 2026 |
| Zerrin Limited | Professional & scientific | 2013 |
| ZFS Consulting Ltd | Information & communication | 2022 |
| Zinsu Ltd | Wholesale & retail | 2026 |
| Ziora Enterprise Limited | Wholesale & retail | 2025 |
| Zipp Design & Print Limited | Manufacturing | 2014 |
| Zolfu Property Limited | Real estate | 2016 |
| Zuliani Property Projects Ltd | Extraterritorial | 2019 |
| Zymshire Limited | Administrative & support | 2019 |
| Äksä Graphics Ltd | Professional & scientific | 2023 |