| Wagtastic Dog Walking Ltd | Other services | 2023 |
| Wakefield Security Systems Limited | Administrative & support | 1988 |
| Wakestone & Wild Ltd | Hospitality | 2022 |
| Walk the Talk Communications Ltd | Professional & scientific | 2013 |
| Walking the Dog Limited | Information & communication | 2005 |
| Ward Complete Maintenance Ltd | Administrative & support | 2023 |
| Warnham Properties Limited | Real estate | 2014 |
| Warnham Village Stores Ltd | Wholesale & retail | 2022 |
| Warren Financial Planning Limited | Financial services | 2004 |
| Waterloo Square Communications Ltd | Professional & scientific | 2024 |
| WC Catering Limited | Hospitality | 2025 |
| Web Communications (Southern) Limited | Real estate | 1997 |
| Web Estates (South) Ltd | Real estate | 2023 |
| Webalactic Ltd | Other services | 2020 |
| West Chilt Jazz Club CIC | Arts & recreation | 2025 |
| West Chiltington Butchers Ltd | Wholesale & retail | 2025 |
| West Sussex Heating Ltd | Construction | 2013 |
| West Sussex Tech Ltd | Wholesale & retail | 2023 |
| West Sussex Water Solutions Ltd | Construction | 2026 |
| Western Sussex Rivers Trust | Administrative & support | 2011 |
| White Label Thinking Ltd | Wholesale & retail | 2018 |
| White Lion Aviation Ltd | Professional & scientific | 2016 |
| White Rose Martlets Property Limited | Real estate | 2016 |
| Whitebait Ltd | Professional & scientific | 2026 |
| Whitecliff RTM Company Limited | Administrative & support | 2006 |
| Whitmore Real Estate Ltd | Real estate | 2024 |
| Wiggonholt Farm Limited | Real estate | 2024 |
| Wild Fortune Limited | Professional & scientific | 2026 |
| Wileman Investments Ltd | Real estate | 2020 |
| Will YOU Ltd | Professional & scientific | 2007 |
| Willetts Digital Ltd | Information & communication | 2020 |
| William Stovell Developments Limited | Construction | 2016 |
| Williams Group Holdings Limited | Extraterritorial | 1973 |
| Windbag Ltd | Other services | 2017 |
| Wine at Mine Ltd | Extraterritorial | 2024 |
| Winegoblet Ltd | Other services | 2023 |
| Winner Plant UK Limited | Other services | 2009 |
| Winterfields Farm Limited | Agriculture & fishing | 1995 |
| Wizzard Aviation Training Limited | Transport & logistics | 2006 |
| WJH Holdings Limited | Financial services | 2016 |
| Wolf 1834, Ltd | Manufacturing | 2003 |
| Wolfe Aerospace Support Ltd | Transport & logistics | 2007 |
| Woodchip Services Southeast Ltd | Other services | 2020 |
| Woodshill Holiday Byres Limited | Hospitality | 2022 |
| Wordcount Ltd | Professional & scientific | 2019 |
| Workforce Dynamics Ltd | Other services | 2018 |
| Worthwhile Property Investments Ltd | Real estate | 2002 |
| Wreckart Ltd | Arts & recreation | 2018 |
| WWW Group Ltd | Information & communication | 2009 |
| WWW Stores Ltd | Wholesale & retail | 2009 |
| Wynn-Ing Vibes Ltd | Information & communication | 2025 |
| Xuxanna Properties Limited | Real estate | 2026 |
| Yalefield Limited | Real estate | 1984 |
| Yalefield Reversions Limited | Real estate | 2024 |
| YES Property Solutions Ltd | Construction | 2017 |
| Youphoric Travel Ltd | Administrative & support | 2025 |