| Wonderford Ltd | Real estate | 2019 |
| Wood Finishing Specialists Limited | Other services | 2013 |
| Woodgrove Contractors Limited | Construction | 2001 |
| Woodrow Vizor Architects Ltd | Professional & scientific | 2021 |
| Woodville Gardens (Surbiton) Residents Association Limited | Households | 1964 |
| Woodville Gardens Garage Owners Limited | Households | 2016 |
| Woomac London Limited | Information & communication | 2014 |
| Worldlink Express Ltd | Administrative & support | 2002 |
| Worldwide Aviation Management Limited | Transport & logistics | 2014 |
| Worldwide Operations Ltd | Transport & logistics | 2013 |
| Wosup UK Limited | Hospitality | 2020 |
| Wpps Consultancy Limited | Information & communication | 2012 |
| Wrgd Ltd | Professional & scientific | 2015 |
| Wrimt Properties UK Ltd | Real estate | 2017 |
| WT Wheelers Ltd | Manufacturing | 2023 |
| Wyllie-Miles Consulting Ltd | Information & communication | 2017 |
| Xander Studios Ltd | Wholesale & retail | 2025 |
| XE Asset Management Limited | Transport & logistics | 2022 |
| Xpress Mobile Tyres Ltd | Wholesale & retail | 2026 |
| XV Pro Asad Ltd | Real estate | 2025 |
| XV Pro Helen Ltd | Real estate | 2025 |
| XVL 1856 Developments Limited | Real estate | 2022 |
| Xyzed Limited | Administrative & support | 2011 |
| Yaexus Ltd | Professional & scientific | 2011 |
| Yapro Europe Limited | Wholesale & retail | 2014 |
| Yates Building Contractors Limited | Construction | 2007 |
| Yembryk Automotive Limited | Manufacturing | 2026 |
| Yembryk Construction Limited | Construction | 2019 |
| YMH Holdings Ltd | Real estate | 2018 |
| YNA Vyner Ltd | Real estate | 2026 |
| Youman Invest Ltd | Extraterritorial | 2019 |
| Your Choice Asset Management Ltd | Real estate | 2018 |
| Yuzzang House Ltd | Wholesale & retail | 2021 |
| Zaks Consulting Services Ltd | Administrative & support | 2019 |
| Zayne Raven Ltd | Wholesale & retail | 2025 |
| ZCI UK Property Ltd | Real estate | 2016 |
| Zeal Manor Ltd | Real estate | 2020 |
| Zealsense Limited | Real estate | 2018 |
| Zebbel Limited | Other services | 2012 |
| Zebra Way Ltd | Households | 2020 |
| ZEN Property Ltd | Real estate | 2017 |
| ZEN Training Ltd | Arts & recreation | 2017 |
| Zenzaa Ltd | Wholesale & retail | 2025 |
| Zepko Limited | Information & communication | 2004 |
| Zerocomm Capital Limited | Information & communication | 2026 |
| Zerocomm Limited | Information & communication | 2026 |
| Ziel Ltd | Extraterritorial | 2017 |
| Zimtralia Property Investments Ltd | Real estate | 2017 |
| ZL Property Maintenance Ltd | Construction | 2024 |
| Zlinzc Ltd | Extraterritorial | 2018 |
| Zloka Consulting Limited | Information & communication | 2019 |