| Whyteleafe Garden Maintenance Ltd | Other services | 2017 |
| Whyteleafe Landscaping Ltd | Administrative & support | 2019 |
| Wild Bush Barnes Limited | Wholesale & retail | 2025 |
| Wild Bush Fulham Limited | Wholesale & retail | 2025 |
| Wild Bush Limited | Education | 2022 |
| Wild Bush Online Limited | Wholesale & retail | 2025 |
| Wild Bush Putney Limited | Wholesale & retail | 2025 |
| Wild Bush Richmond Limited | Wholesale & retail | 2025 |
| Williams Simms & Partners Limited | Real estate | 2020 |
| Wilson's School | Education | 2011 |
| Wimbledon Limousines Ltd | Transport & logistics | 2022 |
| Wincloud Ltd | Information & communication | 2022 |
| Wind Electrical Engineering Limited | Construction | 2022 |
| Windermere Court Residents Management Company Limited | Households | 2001 |
| Wines by Women Ltd | Wholesale & retail | 2018 |
| Wingspan Technology Limited | Information & communication | 2025 |
| Wink Global Ltd | Administrative & support | 2018 |
| Wintec Services Ltd | Information & communication | 2013 |
| Wisdom Events Ltd | Hospitality | 2026 |
| Wisteria Interior Design Ltd | Professional & scientific | 2021 |
| Withj Ltd | Other services | 2022 |
| Witty Solutions Ltd | Professional & scientific | 2007 |
| Wjebb Holdings Ltd | Real estate | 2025 |
| Wojnowski Engineering Services Limited | Manufacturing | 2015 |
| Woldingham Homes Limited | Construction | 2009 |
| Women of Nobility Limited | Administrative & support | 2015 |
| Wonder World Press Ltd | Information & communication | 2023 |
| Wood Lane Cippenham Ltd | Real estate | 2016 |
| Woodcote Essentials Ltd | Wholesale & retail | 2023 |
| Woodcote Garage Ltd | Wholesale & retail | 2019 |
| Woodcote Gardens Limited | Households | 1971 |
| Woodcote Hall (Management) Limited | Administrative & support | 1982 |
| Woodcote Household Ltd | Wholesale & retail | 2023 |
| Woodgrange Construction Co. Limited | Wholesale & retail | 1980 |
| Woodmere Avenue Ltd | Construction | 2019 |
| Worldsview Consulting Limited | Professional & scientific | 2007 |
| Worth - IT House Limited | Health & social care | 2021 |
| WPM Building and Maintenance Ltd | Construction | 2011 |
| Wpwh Investments Ltd | Real estate | 2023 |
| Wraysbury Investments Limited | Real estate | 2016 |
| WT London Ltd | Other services | 2015 |
| WTJ Properties Limited | Real estate | 2025 |
| WU Creation Ltd | Arts & recreation | 2007 |
| Xeena Limited | Information & communication | 2014 |
| Xndar Limited | Real estate | 2024 |
| Xpertwright Ltd | Wholesale & retail | 2024 |
| Xtel Ltd | Information & communication | 2020 |
| Xtel Technology Sourcing Ltd | Wholesale & retail | 2022 |
| Xyloft Ltd | Wholesale & retail | 2024 |
| Xyno Holdings Ltd | Financial services | 2024 |
| Xynosys Limited | Information & communication | 2015 |
| Y & R Mcwilliams Ltd | Other services | 2008 |
| Y&Q Limited | Real estate | 2024 |
| YA HAO Limited | Hospitality | 2023 |
| YA Zheng Group Ltd. | Professional & scientific | 2018 |
| Yalini Limited | Real estate | 2021 |
| Yamali-Bushi Ltd | Construction | 2008 |
| Yamuna Limited | Real estate | 2021 |
| Yann Gibelli Photography Ltd | Professional & scientific | 2025 |
| Yashah Consulting Limited | Information & communication | 2025 |
| YEG Deliveries Ltd | Transport & logistics | 2018 |
| Yewell (NO.1) Limited | Professional & scientific | 2011 |
| Yewell Consulting LLP | | 2005 |
| YGA Consultancy Ltd | Administrative & support | 2023 |
| YIN HO Limited | Professional & scientific | 2017 |
| YJA Studio Ltd | Other services | 2014 |
| Yjlocums Limited | Health & social care | 2009 |
| YK Spices Limited | Hospitality | 2017 |
| Yomagic Investments Ltd | Real estate | 2015 |
| Yomagic Limited | Information & communication | 2013 |
| Yooyoo Overseas Consultants Ltd | Real estate | 2013 |
| Young Leaders Academy Ltd | Education | 2013 |
| Your Technology Centre Ltd | Information & communication | 2014 |
| Yumohi Limited | Professional & scientific | 2022 |
| Yuven Teeth Ltd | Health & social care | 2024 |
| Yves Recruitment Services Ltd | Administrative & support | 2023 |
| Z & a Catering Ltd | Hospitality | 2025 |
| Zalon Ltd | Arts & recreation | 2018 |
| Zanders Interior Limited | Construction | 2005 |
| Zanex Ltd. | Professional & scientific | 1994 |
| Zardaan Group Limited | Wholesale & retail | 2025 |
| Zarinhs Ltd | Other services | 2025 |
| Zebedee Admin Consultancy Ltd | Administrative & support | 2023 |
| ZEE Solutions Limited | Administrative & support | 2019 |
| ZEE3 Services Ltd | Transport & logistics | 2025 |
| Zeebion Ltd | Information & communication | 2022 |
| Zeekhora Ltd | Manufacturing | 2018 |
| ZEN Beauty Salon Limited | Other services | 2025 |
| ZEN Investments Limited | Administrative & support | 2014 |
| ZEN Nails Limited | Real estate | 2017 |
| Zenbank LLP | | 2012 |
| Zenith Global Holdings Ltd | Financial services | 2026 |
| Zenshin Holdings Ltd | Real estate | 2022 |
| Zenshin Talent Ltd | Administrative & support | 2019 |
| Zentasoft Ltd | Information & communication | 2013 |
| ZEUS2 Ltd | Hospitality | 2015 |
| ZFS Property Investments Ltd | Real estate | 2024 |
| ZIA Builders Limited | Construction | 2016 |
| Zigoreazha Limited | Real estate | 2026 |
| Zohan Barbers Limited | Other services | 2017 |