| Winchester Desserts Ltd | Hospitality | 2023 |
| Winchester District Citizens Advice Bureau | Information & communication | 2011 |
| Winchester Dog Services Ltd | Other services | 2025 |
| Winchester Downs Limited | Wholesale & retail | 2024 |
| Winchester Dramatic Society | Arts & recreation | 1982 |
| Winchester Drug Safety Consultants Ltd | Professional & scientific | 2026 |
| Winchester Economics Limited | Professional & scientific | 2017 |
| Winchester Equities Ltd | Transport & logistics | 2015 |
| Winchester Equity Limited | Real estate | 2013 |
| Winchester Facial Aesthetics Ltd | Other services | 2018 |
| Winchester Financial Funding Limited | Financial services | 2012 |
| Winchester Food & Basics Bank | Health & social care | 2004 |
| Winchester Foods Station Ltd | Hospitality | 2025 |
| Winchester Framing Limited | Administrative & support | 2011 |
| Winchester Gastroenterology Limited | Health & social care | 2020 |
| Winchester Golf Academy Holdings Limited | Real estate | 2019 |
| Winchester Golf Academy Limited | Arts & recreation | 2014 |
| Winchester Grill Limited | Hospitality | 2017 |
| Winchester Heart Clinic Ltd | Health & social care | 2024 |
| Winchester Heatpump Services Limited | Construction | 2013 |
| Winchester Home Improvements Limited | Construction | 2018 |
| Winchester Hotel and Spa Ltd | Hospitality | 2021 |
| Winchester Interiors Ltd | Wholesale & retail | 2013 |
| Winchester Investment Solutions Ltd | Financial services | 2009 |
| Winchester Kitchens Installations Ltd | Construction | 2024 |
| Winchester Land Limited | Real estate | 1985 |
| Winchester Landscapes Limited | Administrative & support | 2010 |
| Winchester Legacy Ltd | Professional & scientific | 2015 |
| Winchester Legal Limited | Professional & scientific | 2010 |
| Winchester Lido Sports Association Trustee Limited | Arts & recreation | 2008 |
| Winchester Lodges Limited | Hospitality | 2010 |
| Winchester Marine Consultants Limited | Professional & scientific | 2010 |
| Winchester Marketing Consultancy Ltd | Professional & scientific | 2026 |
| Winchester Media Ltd | Information & communication | 2025 |
| Winchester Medical Aesthetics Limited | Health & social care | 2023 |
| Winchester Mini Cabs Limited | Transport & logistics | 2024 |
| Winchester Mobility Ltd | Wholesale & retail | 2024 |
| Winchester MOT Centre Limited | Wholesale & retail | 2001 |
| Winchester Notary Limited | Professional & scientific | 2018 |
| Winchester Ophthalmic Limited | Health & social care | 2019 |
| Winchester Outdoor Kitchens Limited | Construction | 2009 |
| Winchester Partners Strategic Advisors Limited | Professional & scientific | 2023 |
| Winchester Pickleball Ltd | Arts & recreation | 2025 |
| Winchester Pilates Studio Ltd | Arts & recreation | 2022 |
| Winchester Pizza Ltd | Hospitality | 2025 |
| Winchester Podiatry Ltd | Health & social care | 2018 |
| Winchester Print Holdings Limited | Financial services | 2018 |
| Winchester Property Maintenance Limited | Administrative & support | 2012 |
| Winchester Property Services Limited | Construction | 2015 |
| Winchester Road (Four Marks) Management Company Limited | Households | 2015 |
| Winchester Rugby (Trading) Limited | Arts & recreation | 2026 |
| Winchester Science Centre Limited | Education | 2022 |
| Winchester Smart Homes and Electrical Services Ltd | Construction | 2024 |
| Winchester Spice Ltd | Hospitality | 2025 |
| Winchester Station Taxis Limited | Transport & logistics | 2024 |
| Winchester Steaks Ltd | Hospitality | 2019 |
| Winchester Storage Limited | Transport & logistics | 2024 |
| Winchester Students’ Union | Education | 2024 |
| Winchester Theatre Arts 2020 LLP | | 2020 |
| Winchester Theatre Trust | Arts & recreation | 2003 |
| Winchester Vineyard Christian Fellowship | Other services | 1995 |
| Winchester Wellness Limited | Health & social care | 2016 |
| Winchester Window Dressing Ltd | Manufacturing | 2022 |
| Winchester Windows & Doors Ltd | Construction | 2025 |
| Winchester Wools Ltd | Wholesale & retail | 2016 |
| Winchester Workspace Ltd | Administrative & support | 2019 |
| Winchester Yachts Limited | Manufacturing | 2009 |
| Winchestersushi Limited | Hospitality | 2017 |
| Wincol DEV Limited | Information & communication | 2019 |
| Windmill Court (Croydon) Management Company Limited | Households | 2007 |
| Windsor Drive Flats Freeholders Limited | Households | 1993 |
| Wine Behind the Label Limited | Information & communication | 2013 |
| Wine Words & Wisdom Ltd | Hospitality | 2017 |
| Winery Export Department Limited | Other services | 2012 |
| Winking Tiger Limited | Real estate | 2011 |
| Winlocks of Winchester Ltd | Administrative & support | 2020 |
| Winnall Down Farm Limited | Agriculture & fishing | 1996 |
| Winnall SC Limited | Hospitality | 2012 |
| Winsopia Limited | Information & communication | 2013 |
| Wintonia Consulting Limited | Information & communication | 2014 |
| Wiseman's Consultancy Ltd | Professional & scientific | 2022 |
| Wiseman's Watches Ltd | Wholesale & retail | 2022 |
| Wisemoney Limited | Wholesale & retail | 1993 |
| Wish Upon a Star Limited | Professional & scientific | 2026 |
| Witcher Crawford Limited | Professional & scientific | 2004 |
| With Honour Consulting Ltd | Professional & scientific | 2013 |
| Witney Park & Pick | Financial services | 1997 |
| WJH Glazing Limited | Construction | 2025 |
| WMV Farming Limited | Real estate | 2010 |
| WMW Plumbing & Heating Ltd | Construction | 2019 |
| Wolfheart Limited | Wholesale & retail | 2026 |
| Wolford Motors Limited | Wholesale & retail | 2021 |
| Wonder International Ltd | Information & communication | 2019 |
| Wonderfully Made Ltd | Other services | 2009 |
| Wonderseekers | Education | 1986 |
| Wonston Management Ltd. | Households | 1998 |
| Wonston Pursuits Limited | Hospitality | 2015 |
| Wonston Wine Limited | Agriculture & fishing | 2022 |
| Wood Dale Parks Ltd | Hospitality | 1987 |
| Woodchild Limited | Agriculture & fishing | 1997 |