| Warm Welcome Property Ltd | Real estate | 2025 |
| Warm Words Ltd | Wholesale & retail | 2025 |
| Warmafloor Store Ltd | Wholesale & retail | 2024 |
| Warmnest Estates Ltd | Real estate | 2026 |
| Warndon Sails Ltd | Wholesale & retail | 2007 |
| Warner Construct Limited | Extraterritorial | 2023 |
| Warner Contracting Limited | Construction | 1987 |
| Warner Court (Winchester) RTM Company Ltd | Households | 2021 |
| Warner Management and Consultancy Ltd | Real estate | 2008 |
| Warner Mews Ltd | Households | 2001 |
| Warner Performance Limited | Other services | 2022 |
| Warren Clark Golfing Dreams Limited | Education | 2020 |
| Warren Compliance Limited | Financial services | 2011 |
| Warren Heath Recycling LLP | | 2007 |
| Warren Kleinjan Limited | Professional & scientific | 2026 |
| Warrens Tavern Ltd | Hospitality | 2019 |
| Warriors Basketball CIC | Arts & recreation | 2023 |
| Warriors Basketball Development Limited | Education | 2022 |
| Warsash Builders Limited | Construction | 2015 |
| Warsash Court Limited | Households | 1996 |
| Warsash Enterprises Limited | Construction | 2006 |
| Warsash Garage Services Limited | Wholesale & retail | 2026 |
| Warsash Glazing Ltd | Construction | 2022 |
| Warsash IT Solutions Limited | Information & communication | 2010 |
| Warsash Properties Limited | Construction | 2006 |
| Warsash Spice Ltd | Hospitality | 2025 |
| Warsash Therapy Rooms Ltd | Other services | 2019 |
| Warstone Cafe Ltd | Hospitality | 2018 |
| Warwick Chase Investments Ltd | Real estate | 2022 |
| Warwick Test Supplies Limited | Manufacturing | 1994 |
| Washington Finance Limited | Professional & scientific | 2019 |
| Watamu Management Ukeig | | 2008 |
| Watch House Films Ltd | Information & communication | 2020 |
| Watch V Ltd | Construction | 2026 |
| Watch Vault Ltd | Wholesale & retail | 2026 |
| Watchgas Limited | Professional & scientific | 2021 |
| Watchorn Cook Ltd | Real estate | 2018 |
| Watclean Solutions Ltd | Administrative & support | 2026 |
| Water Processing Limited | Water & waste | 2017 |
| Water Wizards Plumbing & Heating Ltd | Construction | 2024 |
| Waterbridge Capital Limited | Professional & scientific | 2009 |
| Waterfield Publishing Limited | Information & communication | 2013 |
| Waterford Healthcare Limited | Administrative & support | 2023 |
| Waterford Lodge Hotel Limited | Hospitality | 2006 |
| Waterfront Accident Repair Centre Portsmouth Ltd | Wholesale & retail | 2018 |
| Waterfront Hotels (Southport) Limited | Hospitality | 2007 |
| Waterfront Southport Properties Limited | Administrative & support | 2011 |
| Watergen Limited | Professional & scientific | 2013 |
| Wateridge Holdings Limited | Financial services | 2025 |
| Wateridge Marketing Solutions Ltd | Professional & scientific | 2025 |
| Waterlea International Private Limited | Administrative & support | 2022 |
| Waterleaf Investments Limited | Real estate | 2024 |
| Waterloo (Weymouth) Ltd | Hospitality | 2020 |
| Waterloo Court (Southampton) Limited | Households | 1984 |
| Waterloo Road Property Management Limited | Households | 2009 |
| Watermark (Hythe) Limited | Households | 2006 |
| Watermill Management Ukeig | | 2008 |
| Waterrail Roofing Services Ltd | Construction | 2004 |
| Waters & Sons Independent Funeral Directors Limited | Other services | 2009 |
| Waters Bros. (Hauliers) Limited | Transport & logistics | 1971 |
| Waters Edge (Swanwick) Ltd | Households | 2022 |
| Waterside Bowling Club Limited | Arts & recreation | 2024 |
| Waterside Country Park Limited | Real estate | 2017 |
| Waterside Dentspa Limited | Health & social care | 2010 |
| Waterside Emergency Medical Services Ltd | Health & social care | 2015 |
| Waterside Homecare Services (Hythe) Limited | Administrative & support | 2023 |
| Waterside Homecare Services Limited | Health & social care | 2016 |
| Waterside HR Ltd | Administrative & support | 2020 |
| Waterside Inventories Ltd | Real estate | 2025 |
| Waterside Kebab Limited | Hospitality | 2023 |
| Waterside Key Management Ltd | Real estate | 2021 |
| Waterside Laboratories Limited | Manufacturing | 1984 |
| Waterside Management (Hythe) Limited | Households | 1998 |
| Waterside Mews Residents Limited | Households | 2000 |
| Waterside Mortgages Ltd | Financial services | 2021 |
| Waterside PAT Testing Ltd | Construction | 2022 |
| Waterside Plumbing and Heating Limited | Construction | 2003 |
| Waterside Projects Ltd | Manufacturing | 2021 |
| Waterside Tennis Club Ltd | Arts & recreation | 2024 |
| Waterside Windows (South) Ltd | Construction | 2016 |
| Watersmeet Chesilstreetside RTM Company Limited | Households | 2020 |
| Watersmeet Riverside RTM Company Limited | Households | 2020 |
| Watertight Roofing (Hampshire) Limited | Construction | 2026 |
| Watkins Property Ltd | Real estate | 2025 |
| Watkins Ryder LLP | | 2010 |
| Watson Executive Travel Ltd | Transport & logistics | 2001 |
| Watson's Expert Services Limited | Health & social care | 2018 |
| Watt Health Holdings Ltd | Real estate | 2022 |
| Watt Health Ltd | Health & social care | 2020 |
| Watts Delivery Services Limited | Transport & logistics | 2023 |
| Watts Private Limited | Health & social care | 2017 |
| Wattwise Electric Southern Limited | Construction | 2026 |
| Wave Concepts Ltd | Information & communication | 2013 |
| Wave Phone Repair Ltd | Wholesale & retail | 2026 |
| Wavegreen Consulting Limited | Professional & scientific | 2021 |
| Wavelength Properties Limited | Real estate | 2004 |
| Wavelength Salon Ltd | Other services | 2019 |
| Wavemar Electronics Limited | Manufacturing | 1996 |
| Wavemar Electronics Systems Limited | Manufacturing | 1998 |
| Waverley Court Management Company (Southampton) Limited | Households | 1987 |