| Wgpms Limited | Construction | 2017 |
| What Goes Around Limited | Professional & scientific | 2009 |
| Wheel Devil Ltd | Wholesale & retail | 2014 |
| Wheeler Consultancy Limited | Information & communication | 1997 |
| Whimsical Wonders Ltd | Wholesale & retail | 2025 |
| Whitefriar Investments Limited | Financial services | 2019 |
| Wican Properties Limited | Real estate | 2023 |
| Wican Services Limited | Real estate | 2014 |
| Wilbea Medics Ltd | Manufacturing | 2026 |
| Williamson Scaffolding Ltd | Construction | 2024 |
| Willow Electrical (Surrey) Ltd | Construction | 2014 |
| WIN Big Ltd | Extraterritorial | 2016 |
| Windpearl Limited | Hospitality | 2015 |
| Winelink Limited | Wholesale & retail | 1983 |
| Wins Mart Limited | Wholesale & retail | 2020 |
| Winzone Property Management Ltd | Real estate | 2021 |
| Wiremap Ltd | Other services | 2008 |
| Wireon Ltd | Construction | 2017 |
| Wolfy Playz Ltd | Wholesale & retail | 2020 |
| Women's Wellness Collective LLP | | 2025 |
| Wong & LOK Company Ltd | Real estate | 2022 |
| Wong House Limited | Construction | 2016 |
| Woodham Village Store Ltd | Wholesale & retail | 2018 |
| Workplace Transformation Ltd | Information & communication | 2022 |
| World Dance Organisation Limited | Administrative & support | 2020 |
| World Dance Organisers Limited | Administrative & support | 2017 |
| World Decoration Limited | Wholesale & retail | 2020 |
| Worldwide Director Services Limited | Administrative & support | 2005 |
| Worldwide Secretarial Services Limited | Extraterritorial | 2005 |
| Wrap IT UP London Limited | Hospitality | 2013 |
| WSB Estates Ltd | Real estate | 2025 |
| WSK Services Ltd | Information & communication | 2019 |
| Wstm Ltd | Manufacturing | 2025 |
| WW Assets Ltd | Real estate | 2023 |
| XDN Limited | Information & communication | 2016 |
| Xieovia Ltd | Wholesale & retail | 2025 |
| Xresilience Ltd | Information & communication | 2025 |
| Xspan (Building) Ltd | Construction | 2018 |
| Xyxy Care Ltd | Health & social care | 2013 |
| Y & W Accounting Services Ltd | Professional & scientific | 2022 |
| Yahuko & Yahuka Limited | Wholesale & retail | 2025 |
| Yalosai Music School Limited | Education | 2010 |
| YAN Services Ltd | Administrative & support | 2024 |
| Yantech Associates Ltd | Administrative & support | 2022 |
| Yarm Group Ltd | Health & social care | 2022 |
| Yellow Brick Developments Limited | Administrative & support | 1996 |
| Yellow Brick Investments Ltd | Administrative & support | 2012 |
| YI HE Property Limited | Real estate | 2024 |
| Yildiz 12 Limited | Hospitality | 2024 |
| YM Sushi Ltd | Hospitality | 2023 |
| Your Image Limited | Administrative & support | 1994 |
| Yoursignpost Ltd | Information & communication | 2020 |
| Yunaad Barbers Ltd | Other services | 2019 |
| Z Brothers Garden Services Ltd | Administrative & support | 2020 |
| Z500 World Ltd | Professional & scientific | 2018 |
| Zaqeiro Limited | Extraterritorial | 2002 |
| Zara Kebab House Ltd | Hospitality | 2024 |
| Zara Recruitment Ltd | Real estate | 2021 |
| Zarlish Ltd | Real estate | 2022 |
| Zarub Limited | Construction | 2018 |
| Zbud Property Ltd | Real estate | 2019 |
| Zenith BS Properties Ltd | Real estate | 2025 |
| Zenith Building Solution Ltd | Construction | 2021 |
| Zentaria Ltd | Transport & logistics | 2024 |
| Zero Fades Ltd | Other services | 2024 |
| Zfta Properties Ltd | Real estate | 2023 |
| ZJ Carshalton Ltd | Wholesale & retail | 2025 |
| ZOE Mcconnell Photography Limited | Professional & scientific | 2015 |
| Zondatech Limited | Information & communication | 2009 |
| ZONE2ZONE Building Services Ltd | Construction | 2004 |
| Zunaal Properties Limited | Real estate | 2026 |