| Williams M & E Limited | Professional & scientific | 2015 |
| Williams Ventilation Services Limited | Construction | 2020 |
| Wilra Ltd | Households | 2006 |
| Wilton Hotel(St.Leonards) Limited | Real estate | 1946 |
| Wilton Wanderers RTM Company Limited | Households | 2021 |
| Witcombe Surveying and Conservation Limited | Professional & scientific | 2015 |
| Witham Community Care Limited | Health & social care | 2022 |
| Wizwam Productions Limited | Information & communication | 2013 |
| WJD Rail Ltd | Transport & logistics | 2014 |
| WJR UK Property Investment Limited | Real estate | 2019 |
| Woodcast Media Limited | Professional & scientific | 2025 |
| Wootton Construction Hastings Limited | Construction | 2020 |
| WRO Properties Ltd | Real estate | 2021 |
| XBR Consulting Limited | Information & communication | 2011 |
| Xclusv UK Limited | Other services | 2018 |
| Xeroda Limited | Information & communication | 2013 |
| XP Global Sourcing Limited | Wholesale & retail | 2026 |
| Yego Staffing Ltd | Administrative & support | 2023 |
| Yello Fish Ltd | Professional & scientific | 2004 |
| YEW Tree House Westfield Limited | Households | 2002 |
| Yigit Fish Bar Limited | Hospitality | 2024 |
| Youl Grange (Eastbourne) Limited | Other services | 1999 |
| Young Cleopatra Ltd | Information & communication | 2007 |
| Your Dream Chef Limited | Hospitality | 2021 |
| Your Healthcare Recruitment Ltd | Administrative & support | 2012 |
| Your Tech Point Limited | Wholesale & retail | 2025 |
| YT Enterprises Ltd | Wholesale & retail | 2024 |
| Yummy Chinese Kitchen Ltd | Hospitality | 2025 |
| Zafeiri Interiors Ltd | Wholesale & retail | 2021 |
| Zansplaining Ltd | Professional & scientific | 2024 |
| ZEL Electrical Ltd | Construction | 2021 |
| Zenstaysolutions Limited | Real estate | 2026 |
| ZI Heng Chinese Takeaway Ltd | Hospitality | 2026 |
| ZI2 Ltd | Health & social care | 2018 |