| W & L Construction Limited | Construction | 2020 |
| W & L Group Limited | Financial services | 2024 |
| W & L Management Limited | Real estate | 2024 |
| W Squared Holdings Ltd | Real estate | 2026 |
| W&Y Castle Ltd | Hospitality | 2024 |
| Waghorn INT Ltd | Professional & scientific | 2026 |
| Wake Construction Ltd | Construction | 2010 |
| Walderton House RTM Company Limited | Households | 2008 |
| Waldrons Marine Ltd | Manufacturing | 2022 |
| Waldrons Smart Repair Ltd | Manufacturing | 2022 |
| Walk With Wilf Ltd | Other services | 2017 |
| Wallace Nichols Financial Services Limited | Financial services | 2000 |
| Walton House (Bosham) Management Limited | Administrative & support | 1995 |
| Washington Court Management Company Limited | Households | 1989 |
| Watchorn Property Limited | Extraterritorial | 2020 |
| Waterfields Lettings Ltd | Real estate | 2011 |
| Waterfields of Southsea Limited | Real estate | 2009 |
| Watoonga Consultancy Services Ltd | Information & communication | 2024 |
| Watson Accountancy and Consulting Services Ltd | Professional & scientific | 2022 |
| Waverley Grove Limited | Households | 2001 |
| Waverley Grove Management Company (Portsmouth) Limited | Households | 1982 |
| Waverley Grove Management Company Limited | Hospitality | 1982 |
| Waverley Grove Property Management Limited | Real estate | 2017 |
| Waverley Management Company Limited | Households | 1987 |
| Wavionics Limited | Manufacturing | 2016 |
| Wbsm Holdings Ltd | Hospitality | 2017 |
| WDB Interiors Limited | Construction | 2018 |
| WDL Property Management Ltd | Households | 2025 |
| WE ARE Makers Ltd | Arts & recreation | 2020 |
| WE ARE Trifle Ltd | Information & communication | 2023 |
| Wearewa Ltd | Manufacturing | 2025 |
| Web Ghost Limited | Professional & scientific | 2014 |
| Webfirm Ltd | Information & communication | 2026 |
| Webree.Com Ltd. | Information & communication | 1992 |
| Wedglen Garage Limited | Wholesale & retail | 2009 |
| Weird BOI Ltd | Information & communication | 2025 |
| Welfyne Limited | Administrative & support | 2026 |
| Wellfield Road NO 190 Limited | Extraterritorial | 2007 |
| Wells Heating Ltd | Construction | 2020 |
| Wemove Solutions Ltd | Transport & logistics | 2016 |
| West 15 Limited | Arts & recreation | 2006 |
| West Ealing Home Store Limited | Wholesale & retail | 2025 |
| Westbeck Technology Limited | Professional & scientific | 2025 |
| Westbourne Steel & Pipe Fabrications Limited | Manufacturing | 2002 |
| Westcote Heritage Ltd | Construction | 2020 |
| Wexford Contractor Ltd | Administrative & support | 2023 |
| Weybridge Decor and Cleaning Ltd | Hospitality | 2018 |
| Whale BOY Ltd | Information & communication | 2026 |
| What Next Strategy & Planning Ltd | Information & communication | 2017 |
| WHD Novelty Ltd | Wholesale & retail | 2024 |
| Whelan’S Fish & Chips Ltd | Hospitality | 2026 |
| White Heather Transport Limited | Real estate | 1943 |
| White Property Maintenance Limited | Construction | 2012 |
| Whitteng Ltd | Professional & scientific | 2008 |
| WHR Subsea Inspection Services Limited | Mining & quarrying | 2014 |
| Whyteleafe Paving Company Ltd | Construction | 2002 |
| Wickford Games Limited | Information & communication | 2025 |
| William George Installations Ltd | Construction | 2017 |
| William Hughes Homes Ltd | Real estate | 2026 |
| Williams Yacht Services Limited | Professional & scientific | 2012 |
| Willis Project Management Limited | Administrative & support | 2008 |
| Wilpeg Ltd | Hospitality | 2025 |
| Wilton Exchange Right to Manage Company Limited | Households | 2015 |
| Wilton&Co (London) Ltd | Administrative & support | 2025 |
| Wind Empire Ltd | Information & communication | 2024 |
| Wind in the Willows (Portsmouth) Limited | Education | 2014 |
| Window AID Group Ltd | Construction | 2026 |
| Windsor Brothers Ltd | Professional & scientific | 2018 |
| Windsor Mansions Limited | Households | 2010 |
| Winkhairbeauty Limited | Other services | 2019 |
| Winter Communications Ltd | Information & communication | 2019 |
| Wisa Beauty Limited | Other services | 2025 |
| Wise Works Limited | Construction | 2026 |
| Wizprotech Ltd | Professional & scientific | 2023 |
| Wizzywig Ltd | Information & communication | 2010 |
| WMC Solutions Ltd | Construction | 2013 |
| WNC Fitness for Life Ltd | Other services | 2024 |
| WOK Chippy Ltd | Hospitality | 2023 |
| Wonderfloors Ltd | Construction | 2024 |
| Wooden Hospitality Consultancy Ltd | Professional & scientific | 2020 |
| Working With OT Ltd | Extraterritorial | 2020 |
| Workout Coach Limited | Arts & recreation | 2019 |
| Worley Family Holdings Limited | Real estate | 1983 |
| WR369 Limited | Wholesale & retail | 2020 |
| Wright Retail Services Ltd | Construction | 2015 |
| WRK Wellness Club Limited | Arts & recreation | 2025 |
| Wscgroundworks Ltd | Construction | 2025 |
| Wykeham House (Fareham) Management Company Limited | Real estate | 2020 |
| Wykeham Place (Fareham) Management Company Limited | Real estate | 2020 |
| Wykeham Sports Hall (Fareham) Management Company Limited | Real estate | 2020 |
| Wylam Defence Systems Limited | Manufacturing | 1994 |
| Wylam Hill Limited | Extraterritorial | 2011 |
| Xclique Ltd | Administrative & support | 2026 |
| XEN Corp Ltd | Wholesale & retail | 2021 |
| Xenva Limited | Professional & scientific | 1997 |
| Xpor Limited | Information & communication | 2016 |
| XR Merchandise Ltd | Arts & recreation | 2026 |
| XR Robots Ltd | Arts & recreation | 2024 |
| Yamz Kebabz Limited | Hospitality | 2025 |
| Yana Shop Limited | Wholesale & retail | 2025 |