| Wilton Building Services Ltd | Construction | 2019 |
| WIM Solutions Limited | Hospitality | 2018 |
| Wimbledon Carriage Company Limited | Wholesale & retail | 1983 |
| Windgale Limited | Wholesale & retail | 1983 |
| Windham Property (Management) Limited | Real estate | 1965 |
| Windrose Enterprises Limited | Professional & scientific | 2018 |
| Windsor Court (Sutton) Management Company Limited | Households | 2004 |
| Windsor Place (Caterham) Management Company Limited | Households | 2010 |
| Windwood Cars Limited | Wholesale & retail | 2019 |
| Windworth Property(Management) Limited | Households | 1965 |
| Winfield House Limited | Professional & scientific | 2023 |
| Wing Bidco Limited | Financial services | 2026 |
| Wing Midco Limited | Financial services | 2026 |
| Winter House Holdings Ltd | Financial services | 2024 |
| Winton Developments Limited | Real estate | 2026 |
| Wireless Terminal Solutions Ltd | Information & communication | 2009 |
| Wizzy Ltd | Real estate | 2008 |
| WLA Architecture LLP | | 2008 |
| WME Design Ltd | Construction | 2013 |
| Wmrl Property Group Ltd | Real estate | 2025 |
| Wolsey House Properties Limited | Real estate | 2002 |
| Wonford Limited | Information & communication | 2018 |
| Wood Lodge Wimbledon Services Limited | Households | 2005 |
| Wood-Dene Limited | Households | 1994 |
| Woodcote Hall (Epsom) Management Company Limited | Households | 1999 |
| Woodland Drive Residents' Association Limited | Households | 1964 |
| Woodlands (Chipstead) Management Company Limited | Households | 2002 |
| Woodlands Country Homes Limited | Real estate | 2004 |
| Woodlark Designs Limited | Construction | 2020 |
| Woods END (Horsley) Ltd | Households | 2019 |
| Woodside Lands Estates Limited | Professional & scientific | 1984 |
| Woodside Lands Limited | Construction | 1969 |
| Woodside Lands Management Limited | Professional & scientific | 1990 |
| Woodwish Carpentry Limited | Construction | 2022 |
| Wootton Grange Management Company Limited | Households | 1973 |
| Workbench Consulting Ltd | Information & communication | 2013 |
| Worxhouse Ltd | Information & communication | 2014 |
| Woznet Ltd | Information & communication | 2022 |
| Wpcc Ltd | Health & social care | 2024 |
| WR Surrey Construction Limited | Construction | 2023 |
| Wray & Roberts Limited | Real estate | 2023 |
| Wray Park Road (Reigate) Management Company Limited | Households | 2002 |
| Wreade and SON Limited | Agriculture & fishing | 2011 |
| Wreyford Limited | Professional & scientific | 2015 |
| Writework Ltd | Professional & scientific | 2024 |
| Wunder Workshop Ltd | Wholesale & retail | 2014 |
| WWV Limited | Information & communication | 2005 |
| Wychwood Capital Ltd | Professional & scientific | 2021 |
| Wycombe Holdings Limited | Professional & scientific | 2004 |
| Wycombe Industrial Properties Limited | Real estate | 1955 |
| Wylye Limited | Real estate | 2025 |
| WYSE2 Limited | Administrative & support | 2006 |
| X-Flow II Limited | Wholesale & retail | 2019 |
| Xanthos Creative Design Limited | Professional & scientific | 2016 |
| XDC Limited | Information & communication | 2014 |
| Xhuma Limited | Extraterritorial | 2022 |
| Xiidesign Ltd | Professional & scientific | 2015 |
| Xpert Energy Installations Ltd | Construction | 2011 |
| Xpress Property Development Limited | Real estate | 2007 |
| Xpress Property Freeholders Limited | Real estate | 2023 |
| Xpressing Cleaning Services Ltd | Administrative & support | 2021 |
| Xtravirt Limited | Information & communication | 2005 |
| Xtshs Ltd | Construction | 2024 |
| XVX Property Ltd | Real estate | 2023 |
| XVX Television Limited | Information & communication | 2006 |
| Y M LIU Ltd | Professional & scientific | 2023 |
| Yappy Enterprises Ltd | Wholesale & retail | 2026 |
| Yeoman Court Management Company Limited | Households | 2003 |
| YEW Place Management Company (Weybridge) Limited | Real estate | 1993 |
| YEW Tree Residencies Ltd | Real estate | 2010 |
| YF Renewables Services Ltd | Professional & scientific | 2020 |
| York Place (Guildford) Management Company Limited | Households | 2007 |
| Zaika Trading Limited | Real estate | 2025 |
| Zana Investments Limited | Administrative & support | 1989 |
| ZAP Electrician Services Ltd | Construction | 2021 |
| ZAP Property Investments Ltd | Real estate | 2025 |
| Zara Eden Limited | Other services | 2018 |
| Zcounts Ltd | Professional & scientific | 2007 |
| ZEN Garden (Leatherhead) Limited | Hospitality | 2012 |
| ZEN Garden Delights Ltd | Hospitality | 2025 |
| ZEN Group 40 Limited | Hospitality | 2025 |
| Zento Tech Ltd | Information & communication | 2023 |
| Zentodrive Limited | Wholesale & retail | 2016 |
| Zero Carbon QS Ltd | Professional & scientific | 2021 |
| Zest Benefits Limited | Extraterritorial | 2021 |
| Zest Technology Group Limited | Financial services | 2021 |
| Zest Technology Holdings Limited | Financial services | 2021 |
| Zest Technology Limited | Information & communication | 2004 |
| Zetetik Limited | Extraterritorial | 2015 |
| Zib&Co Ltd | Other services | 2023 |
| ZIK Decor Ltd | Construction | 2024 |
| ZOE and Chloe Holdings Limited | Financial services | 2025 |
| Zoetis UK Limited | Wholesale & retail | 2012 |
| Zomme Ltd | Wholesale & retail | 2019 |
| Zone Services Limited | Professional & scientific | 2025 |
| Zoom GAS Pipelines Limited | Financial services | 2006 |
| Zoom Holding Limited | Financial services | 2006 |
| Zoom Infrastructure Limited | Financial services | 2006 |
| Zoom Insights Limited | Wholesale & retail | 2021 |
| Zs&H Way to Dream! Ltd | Construction | 2015 |