| Wellbeing Havant Centre Ltd | Other services | 2025 |
| Wembley 66 Limited | Arts & recreation | 2006 |
| Wessex Self Drive Ltd | Administrative & support | 1978 |
| West Sussex Digital Radio Ltd | Information & communication | 2025 |
| White Olives Healthcare Limited | Health & social care | 2023 |
| Whites Property Maintenance Ltd | Construction | 2021 |
| Whittaker Consulting Limited | Health & social care | 2019 |
| WHL Design Ltd | Information & communication | 2011 |
| Wibra Limited | Health & social care | 2014 |
| Wickham & Sons Brickwork & Groundworks Ltd | Construction | 2026 |
| William L Carroll Limited | Transport & logistics | 2005 |
| William Padbury Carpentry Limited | Construction | 2023 |
| Williamson Menzies Limited | Construction | 2011 |
| Willow Tree Falcons Ltd | Agriculture & fishing | 2019 |
| Willows Waste Limited | Water & waste | 2022 |
| Woods ROW Property Management Limited | Real estate | 2013 |
| Work TAB Ltd | Manufacturing | 2025 |
| World of Music Education Limited | Education | 2010 |
| Worldwide Yachting Limited | Transport & logistics | 2020 |
| Wray House Ltd | Administrative & support | 2018 |
| Wright Engineers Limited | Manufacturing | 2014 |
| Wright Resourcing Ltd | Administrative & support | 2025 |
| Xalvary Associates Limited | Professional & scientific | 2008 |
| Xelensis Limited | Construction | 2020 |
| XYZ Business Training Limited | Professional & scientific | 2009 |
| XYZ Training Group Ltd | Professional & scientific | 2009 |
| YAD Barbershop Ltd | Other services | 2025 |
| Yemzocity Limited | Other services | 2022 |
| Yescando Limited | Administrative & support | 2014 |
| Yondi Dental Ltd | Health & social care | 2020 |
| Yorbl Digital Health & Care Solutions Ltd | Wholesale & retail | 2024 |
| Yours Truly Community CIC | Other services | 2025 |
| Youtobrew Ltd | Wholesale & retail | 2020 |
| Yummy and Hearty Express Company Limited | Hospitality | 2022 |
| Zamzam Energy Limited | Professional & scientific | 2023 |
| Zapled Limited | Professional & scientific | 2013 |
| Zealandia Ltd | Real estate | 2020 |
| Zenith Able Limited | Professional & scientific | 2024 |
| Zero 21 Limited | Extraterritorial | 2000 |
| Zero Network Ltd | Wholesale & retail | 2011 |
| Zero Twenty One Limited | Extraterritorial | 2000 |
| Zhou Holdings Ltd | Financial services | 2026 |
| ZL Roofing Contractors Limited | Construction | 2020 |