| Whiteswift Creative Limited | Information & communication | 2019 |
| Whybyrd Limited | Professional & scientific | 2017 |
| Wicklow & Herts Ltd | Manufacturing | 2026 |
| Wiise Ltd. | Other services | 2014 |
| Wild Kites Forest School Ltd | Education | 2022 |
| Wildwood UK Ltd | Administrative & support | 2008 |
| Will's Bakery Ltd | Manufacturing | 2017 |
| Willis-Browne Holdings Ltd | Financial services | 2025 |
| Willis-Browne Ltd. | Information & communication | 2014 |
| Willis-Browne Properties Ltd | Real estate | 2025 |
| Willow 2000 Ltd | Construction | 2025 |
| Wills Shoes Ltd | Wholesale & retail | 2025 |
| Wills Tickets Ltd | Wholesale & retail | 2024 |
| Wilsden Cleaning Ltd | Administrative & support | 2015 |
| Wilson Financial Services Ltd | Professional & scientific | 2022 |
| Wilson Kape Consulting Ltd | Professional & scientific | 2019 |
| Wilstone Barns Residents Limited | Households | 2023 |
| Wiltlow Limited | Real estate | 1988 |
| Wimbledon Programme Management Ltd | Information & communication | 2023 |
| Winslade Sound Services Ltd | Information & communication | 2025 |
| WIREFR3 Radio Communications Limited | Information & communication | 2017 |
| Wireless LAN MAN Limited | Information & communication | 2005 |
| Wiser Websites Ltd | Administrative & support | 2014 |
| Wold Thang Ltd | Financial services | 2020 |
| Wood Creations Limited | Construction | 2003 |
| Woodbridge Accountants Limited | Professional & scientific | 2014 |
| Woodenstone Design Limited | Real estate | 2000 |
| Woodman Scott Investments Limited | Real estate | 2021 |
| Woodside Asset Holdings Ltd | Financial services | 2023 |
| Woodside Asset Ltd | Real estate | 2014 |
| Woodville IT Limited | Information & communication | 2018 |
| Woody Bay Apartments Limited | Hospitality | 2014 |
| WRYT3R Ltd | Information & communication | 2026 |
| WV Autos Limited | Manufacturing | 2016 |
| X-Ray Innovation Ltd | Manufacturing | 2016 |
| X-Ray Tech Limited | Professional & scientific | 2022 |
| Xcaliba Limited | Manufacturing | 2000 |
| XD Technology Consulting Ltd | Information & communication | 2025 |
| Y Kondratyuk Ltd | Construction | 2014 |
| Yaggy FC Ltd | Hospitality | 2025 |
| Yenz Ltd | Information & communication | 2023 |
| Ygeneralist Ltd | Professional & scientific | 2018 |
| Yknot Assemblage Ltd | Manufacturing | 2024 |
| Your Digital Home Ltd | Construction | 2021 |
| Your Insight Limited | Other services | 2008 |
| Your Own Home Care Limited | Health & social care | 2014 |
| YVO Solutions Ltd | Professional & scientific | 2023 |
| Zafs Ices Ltd | Hospitality | 2023 |
| Zami Filmhouse Limited | Information & communication | 2025 |
| Zebra Boilers, Plumbing and Heating Limited | Construction | 2019 |
| Zebra Estates Ltd | Real estate | 2022 |
| ZER06 Ltd | Arts & recreation | 2012 |
| Zero Clicks Limited | Information & communication | 2019 |
| ZK Cosmetics Ltd | Other services | 2019 |
| Zlot Ltd | Information & communication | 2018 |
| Zute Capital Ltd | Information & communication | 2019 |
| Zyrth Consulting Limited | Information & communication | 2018 |