| Winifred Legal Services Limited | Professional & scientific | 2015 |
| Winstanley Plumbing Services Ltd | Construction | 2019 |
| Winstara Ltd | Wholesale & retail | 2022 |
| Wintermind Private Ltd | Health & social care | 2024 |
| Winterslow Drive Limited | Real estate | 2024 |
| Wired by JP Ltd | Construction | 2024 |
| Wisdom Group of Consultants Limited | Education | 2020 |
| Wise Remarketing Limited | Wholesale & retail | 2019 |
| Wisemen Care Ltd | Health & social care | 2025 |
| Wishlist Trading Ltd | Wholesale & retail | 2021 |
| Witchwood Limited | Information & communication | 2006 |
| Witgrove Limited | Professional & scientific | 1981 |
| Withya Traders Limited | Wholesale & retail | 2019 |
| WJ LEE and Co Limited | Professional & scientific | 2015 |
| WJ Tech Solutions Ltd | Information & communication | 2026 |
| Wjdi Ltd | Construction | 2014 |
| WKG Groundworks Ltd | Construction | 2025 |
| WKO Property Limited | Real estate | 2024 |
| WO Build Ltd | Construction | 2022 |
| Wolfram Electrical Limited | Construction | 2016 |
| Wonder Cakes Limited | Hospitality | 2017 |
| Wood Estates Group Limited | Real estate | 2026 |
| Wood London Ltd | Construction | 2022 |
| Woodcote Capital Limited | Real estate | 2021 |
| Woodcote Contractors Limited | Construction | 2021 |
| Woodcote Media Ltd | Information & communication | 2014 |
| Woodcote Residential Investments Limited | Real estate | 2023 |
| Woodcrest Freehold Limited | Households | 2008 |
| Woodland Court Residents Company Limited | Households | 1992 |
| Woodlempark Ltd | Real estate | 2010 |
| Woodpecker House Residents Association (Trematon Place) Limited | Real estate | 1992 |
| Woods Builders Limited | Construction | 2003 |
| Woodside Commercial Projects Ltd | Construction | 2024 |
| Woodstock 1962 Limited | Extraterritorial | 2013 |
| Woodstock Hand Car Wash Limited | Administrative & support | 2019 |
| Worcester Grange Freehold Limited | Households | 1998 |
| Worcester Park Electrical Ltd | Construction | 2019 |
| Words & Ears Limited | Education | 2011 |
| Wordup App Holdings Ltd | Information & communication | 2021 |
| Wordup App Ltd | Information & communication | 2019 |
| Work in Progress Construction Ltd | Construction | 2021 |
| Working Links (Employment) Limited | Administrative & support | 2000 |
| Works and Words Limited | Education | 2008 |
| Workstay Living Limited | Real estate | 2026 |
| World Linker Ltd | Wholesale & retail | 2025 |
| Worldclass Engineering Services Ltd | Manufacturing | 1997 |
| Worldwide Electric Ltd | Wholesale & retail | 2024 |
| Worlta Health Care Ltd | Health & social care | 2020 |
| Wote Limited | Information & communication | 2020 |
| WR Enterprises Limited | Wholesale & retail | 2017 |
| Wrap a Roti Limited | Other services | 2018 |
| Wrap and Run Ltd | Hospitality | 2014 |
| Wraps and Rolls Ltd | Hospitality | 2026 |
| Wren Court (Freehold) Limited | Households | 2003 |
| Wren House Management Limited | Households | 1978 |
| WWP Learning and Development Limited | Information & communication | 1981 |
| WWP Training Limited | Professional & scientific | 2011 |
| Wyken Limited | Professional & scientific | 2016 |
| Wyne Builders Ltd | Construction | 2017 |
| Wyne Properties Limited | Real estate | 2020 |
| Wyvell Close Management Limited | Households | 2020 |
| WZ Construction Limited | Construction | 2023 |
| X-Designs Limited | Information & communication | 2005 |
| X24 Ltd | Administrative & support | 2018 |
| X8 Foreign Trading Ltd | Wholesale & retail | 2017 |
| Xandermatthew Limited | Real estate | 2011 |
| XBG Services Ltd | Construction | 2020 |
| Xchargeev Ltd | Construction | 2025 |
| Xdebt Advisory Ltd | Professional & scientific | 2020 |
| Xenophon Visionary Mentoring Ltd | Professional & scientific | 2024 |
| Xiang YI Limited | Other services | 2008 |
| Xindi Food Ltd | Hospitality | 2016 |
| XL Designs Limited | Information & communication | 2000 |
| XO Link Ltd | Information & communication | 2024 |
| Xpert Books Limited | Professional & scientific | 2019 |
| XPO Global Limited | Wholesale & retail | 2019 |
| Y Soyler Investments Ltd | Financial services | 2026 |
| Y V P Heating and GAS Ltd | Construction | 2019 |
| Y&S Protection Ltd | Construction | 2022 |
| Y. O Consultants Limited | Information & communication | 1997 |
| Y.A.S. Transport Services Ltd | Transport & logistics | 2017 |
| Y.M. and Company Limited | | 1980 |
| Yachts Woodwork Ltd | Manufacturing | 2022 |
| Yale Holdings Ltd | Real estate | 2020 |
| Yangtze Logistics Limited | Administrative & support | 2019 |
| Yani Yordanova Photography Ltd | Professional & scientific | 2016 |
| Yaqub (JV) Ventures Ltd | Real estate | 2024 |
| Yardley Court Finance Ltd | Financial services | 2025 |
| Yardley Court Freeholders Limited | Households | 1989 |
| Yaser Investments Limited | Real estate | 2008 |
| Yassir Iqbal Ltd | Information & communication | 2025 |
| Yavari Holdings Limited | Other services | 2015 |
| YB Engineering Consultants Limited | Professional & scientific | 2022 |
| YD Building Services Ltd | Construction | 2019 |
| Yeksha Limited | Transport & logistics | 2025 |
| Yellow a Shop Ltd | Wholesale & retail | 2026 |
| Yeoman Court Residents Association Limited | Households | 1963 |
| YES Lets! (Sutton) Limited | Real estate | 2015 |
| YES to Natural Limited | Health & social care | 2021 |
| Yiamiam Ltd | Hospitality | 2018 |