| White & Lloyd Consulting Engineers Limited | Professional & scientific | 2017 |
| White & Lloyd Ltd | Professional & scientific | 2014 |
| White & Lloyd Property Holdings Ltd | Real estate | 2018 |
| White Knight Capital Reserves Limited | Real estate | 2020 |
| Wilkes World Limited | Arts & recreation | 2004 |
| Will Baxter Limited | Professional & scientific | 2004 |
| Williams Property Partners Limited | Real estate | 2017 |
| Williams Property Sales Limited | Wholesale & retail | 2018 |
| Wimbledon Strength Club Ltd | Other services | 2018 |
| Winter Coaching Ltd | Education | 2025 |
| Wolfe Residential Limited | Real estate | 2024 |
| Wolsey Avenue Residents Association Limited | Households | 1999 |
| Women in Identity Ltd | Other services | 2018 |
| Woof About Limited | Administrative & support | 2024 |
| Working With Cancer | Other services | 2014 |
| WOW Agile Ltd | Professional & scientific | 2021 |
| Wylde Hospitality Ltd | Professional & scientific | 2024 |
| Wyndham ROW Ltd | Real estate | 2025 |
| X Equals Productions Limited | Administrative & support | 2015 |
| Xams Ltd | Wholesale & retail | 2024 |
| XAV Swim Limited | Education | 2023 |
| Xolid Solutions Limited | Administrative & support | 2022 |
| Xveon Ltd | Wholesale & retail | 2025 |
| Xytecs Ltd | Professional & scientific | 2016 |
| Yadency Limited | Information & communication | 2024 |
| Yoyo Films Limited | Other services | 2010 |
| Zababa Limited | Health & social care | 2020 |
| Zababa Media Ltd | Health & social care | 2025 |
| Zabeysabey Ltd | Professional & scientific | 2015 |
| Zach Jones Ltd | Professional & scientific | 2024 |
| Zadona Ltd | Extraterritorial | 2016 |
| Zapio Limited | Professional & scientific | 2020 |
| Zenastar Properties Limited | Real estate | 2002 |
| Zunz Productions Limited | Information & communication | 1988 |