| Wilkinson 3 Group Ltd | Manufacturing | 2025 |
| Wilkinson Safety Limited | Professional & scientific | 2025 |
| Wilkinson Western Reed Limited | Hospitality | 2013 |
| Wilkport Limited | Hospitality | 2007 |
| Will HE Wipe Limited | Wholesale & retail | 2024 |
| Will Taylor Building Services Limited | Construction | 2022 |
| Willbuck Scaffolding Limited | Construction | 2018 |
| Willett & Co Holdings Limited | Financial services | 2025 |
| Willett Estates Ltd | Real estate | 2024 |
| Willett Ryan Investments Ltd | Real estate | 2025 |
| William Albert Court Management Company Limited | Administrative & support | 2002 |
| William Court Management Company Limited | Real estate | 2001 |
| William Rose Property Developments Limited | Real estate | 2021 |
| Williams Contracts Limited | Construction | 2020 |
| Williams Plastering Ltd | Extraterritorial | 2016 |
| Williams Property Estates Ltd | Real estate | 2023 |
| Willow Tree Assessments Ltd | Health & social care | 2025 |
| Willows Cornish Properties Limited | Hospitality | 2026 |
| Willowsmere Management (Baffins) Ltd | Real estate | 2018 |
| Willowtree Nursery Portsmouth Limited | Education | 2021 |
| Wills at Clarity Limited | Professional & scientific | 2026 |
| Willsys Technologies Ltd | Construction | 2026 |
| Wilson Consulting Group Limited | Professional & scientific | 2025 |
| Wimborne Property Developments Limited | Construction | 2025 |
| Winchester Housing Trust Limited | Real estate | 1987 |
| Winchester Ice Cream Company Ltd | Hospitality | 2026 |
| Winchester Private Finance Limited | Financial services | 2020 |
| Winchester Solutions Limited | Information & communication | 2014 |
| Wincott Property Ltd | Real estate | 2025 |
| Window Warehouse Limited | Manufacturing | 1986 |
| Window Workshop Hampshire Ltd | Construction | 2011 |
| Windval Ltd | Real estate | 2022 |
| Windwings Holdings Limited | Financial services | 2020 |
| Wingate Workspace Limited | Real estate | 2021 |
| Wingfield Investment Ltd | Real estate | 2018 |
| Wings Civil Engineering Limited | Construction | 2019 |
| Wings for Warriors Ltd | Education | 2012 |
| Wings of Speed Ltd | Administrative & support | 2007 |
| Wingting Ltd | Hospitality | 2024 |
| Wink Beauty Base Ltd | Other services | 2016 |
| Winstay Limited | Health & social care | 2017 |
| Winterstoke Ltd | Hospitality | 2018 |
| Wireless Solutions Limited | Administrative & support | 1999 |
| Wise Lets Ltd | Real estate | 2018 |
| Wisefox Ltd | Information & communication | 2022 |
| Wish Lane Court Management Company (Southsea) Limited | Households | 1997 |
| Wither YEW Limited | Information & communication | 2012 |
| Withit (Portsmouth) Ltd | Wholesale & retail | 2011 |
| Witterings Trading Ltd | Hospitality | 2015 |
| Wizard Cleaning Limited | Other services | 2004 |
| Wize Healthcare Limited | Administrative & support | 2022 |
| Wize Partners CIC | Health & social care | 2022 |
| WJS Carpentry Ltd | Manufacturing | 2022 |
| WKW Consulting Ltd | Information & communication | 2025 |
| WMB Consultancy Limited | Professional & scientific | 2023 |
| Woba UK Ltd | Manufacturing | 2021 |
| WOK Express Portsmouth Ltd | Hospitality | 2026 |
| Wolf Tucker Limited | Manufacturing | 2011 |
| Wonderful Nails & Spa Ltd | Other services | 2019 |
| Wonderful Rooms Ltd | Real estate | 2010 |
| Wonderful Rooms Properties Ltd | Real estate | 2019 |
| Wonell Holdings Limited | Professional & scientific | 2000 |
| WOO Enterprises Ltd | Wholesale & retail | 2015 |
| Wood Flooring Associates Limited | Construction | 2025 |
| Wood Flooring Supply Limited | Construction | 2025 |
| Wooden Wonders Carpentry Limited | Construction | 2024 |
| Woodfield Avenue Management Company Limited | Households | 1999 |
| Woodhead Precision Ltd. | Administrative & support | 2013 |
| Woodland Crafts Limited | Arts & recreation | 2005 |
| Woodland Storm Ltd | Wholesale & retail | 2023 |
| Woodlark Gardens Management Company Limited | Households | 2021 |
| Woodpecker Carpentry and Build Ltd | Manufacturing | 2018 |
| Woodplas Limited | Construction | 1998 |
| Woodridge Roofing Ltd | Construction | 2025 |
| Woodside Logistics UK Limited | Transport & logistics | 2019 |
| Woodward & Co Accounting Solutions Ltd | Professional & scientific | 2023 |
| Woody & Dixie Ltd | Hospitality | 2026 |
| Word of Mouth World C.I.C. | Arts & recreation | 2023 |
| Work Better Innovations Community Interest Company | Professional & scientific | 2021 |
| Work in Football Limited | Information & communication | 2024 |
| Work Safe Solutions Limited | Professional & scientific | 2016 |
| Workare Holdings Limited | Health & social care | 2023 |
| Works Wonders Occupational Health Limited | Health & social care | 2010 |
| Workshop Cookbook Limited | Information & communication | 2012 |
| Workstay Group Limited | Professional & scientific | 2020 |
| Workwise Ergonomics Limited | Health & social care | 2015 |
| World Wide Insulation Ltd | Construction | 2018 |
| Worldpubs Limited | Hospitality | 2025 |
| Worplesdon Developments Ltd | Construction | 2025 |
| Wote ST Employment Bureau Limited | Administrative & support | 2003 |
| Wrapt Limited | Other services | 2017 |
| WRD Holdings Limited | Financial services | 2024 |
| Wright 4 Property Ltd | Real estate | 2025 |
| Wruk Limited | Administrative & support | 2008 |
| WRW Investments Limited | Real estate | 2025 |
| Ws&M Limited | Real estate | 2014 |
| Wscb Ltd | Extraterritorial | 2017 |
| Wsdn Ltd | Manufacturing | 2022 |
| WTJ Holdings IOW Limited | Financial services | 2021 |
| WW1 Limited | Professional & scientific | 2004 |