| WIL Developments Ltd | Construction | 2015 |
| Wild Apple Nutrition Ltd | Health & social care | 2022 |
| Wildlife Park Ltd | Extraterritorial | 2019 |
| Wilks IT Limited | Information & communication | 2013 |
| William Emerson Limited | Arts & recreation | 2001 |
| William Robert Associates Limited | Other services | 1996 |
| William West Candles Ltd | Manufacturing | 2022 |
| Williams Design & Development Ltd. | Professional & scientific | 2005 |
| Willow Charters Limited | Transport & logistics | 2022 |
| Willow Grove Management Company Limited | Households | 1999 |
| Willows Wood Limited | Education | 2023 |
| Willowside Grange Management Company Limited | Households | 2023 |
| Wiltshire Drive (Wokingham) Management Co. Limited | Households | 1983 |
| Windermere Close (Chorleywood) Freehold Limited | Households | 2008 |
| Windermere Close Management Company (Chorleywood) Limited | Households | 1984 |
| Windsor & District C.I.C. | Other services | 2019 |
| Windsor & Eton Brewery Holdings Limited | Financial services | 2021 |
| Windsor & Eton Brewing Company Limited | Manufacturing | 2009 |
| Windsor & Eton Coffee Company Ltd | Manufacturing | 2024 |
| Windsor & Eton Electrical Services Ltd | Construction | 2019 |
| Windsor & Eton Football Club CIC | Arts & recreation | 2023 |
| Windsor & Eton Guardians Limited | Education | 2026 |
| Windsor & Eton Stoves Limited | Construction | 2012 |
| Windsor Accountancy Limited | Professional & scientific | 2002 |
| Windsor and Ascot Driving Group | Health & social care | 2013 |
| Windsor Audio Limited | Wholesale & retail | 2025 |
| Windsor Boats Limited | Extraterritorial | 2003 |
| Windsor Bridge Court (Management) Company Limited | Households | 2011 |
| Windsor Building Services Limited | Construction | 2019 |
| Windsor Cardiac Clinic Limited | Health & social care | 2020 |
| Windsor Classics Limited | Wholesale & retail | 2016 |
| Windsor Computer Services Limited | Information & communication | 2009 |
| Windsor Consumer Healthcare Scientific Ltd | Professional & scientific | 2023 |
| Windsor Contracting Limited | Information & communication | 2025 |
| Windsor Court Management Company Limited | Households | 1985 |
| Windsor Denture Studio Limited | Health & social care | 2012 |
| Windsor Dog Walks Ltd | Administrative & support | 2010 |
| Windsor Equestrian Promotions Limited | Arts & recreation | 1996 |
| Windsor Escapes LLP | | 2025 |
| Windsor Essence Ltd | Wholesale & retail | 2019 |
| Windsor Estates Finance Limited | Financial services | 1982 |
| Windsor Estates Limited | Real estate | 1979 |
| Windsor FC Limited | Arts & recreation | 2022 |
| Windsor Festival Society Limited (the) | Arts & recreation | 1969 |
| Windsor Financial Services Ltd | Financial services | 2017 |
| Windsor Foot and Ankle Clinic Limited | Health & social care | 2018 |
| Windsor Heating Supplies Limited | Wholesale & retail | 1978 |
| Windsor House (Slough) Ltd. | Households | 2004 |
| Windsor Investments Consulting Limited | Professional & scientific | 2022 |
| Windsor Joinery (GDC) Limited | Manufacturing | 2025 |
| Windsor Kebab & Grill Ltd | Hospitality | 2026 |
| Windsor Lawn Tennis Club | Arts & recreation | 1997 |
| Windsor Learning Partnership | Education | 2015 |
| Windsor Link Railway Limited | Transport & logistics | 2009 |
| Windsor Male Grooming Ltd | Other services | 2020 |
| Windsor Moorings Ltd | Hospitality | 2000 |
| Windsor PCN Limited | Health & social care | 2023 |
| Windsor Pharmacy Limited | Wholesale & retail | 2023 |
| Windsor Prep Limited | Education | 2023 |
| Windsor Private GP Services Limited | Health & social care | 2021 |
| Windsor Property Assets Ltd | Real estate | 2018 |
| Windsor Property Investments Limited | Real estate | 2017 |
| Windsor Roofing Specialist Ltd | Construction | 2022 |
| Windsor Rugby Football Club Limited | Arts & recreation | 2010 |
| Windsor Solar Ltd | Administrative & support | 2010 |
| Windsoria Ltd | Wholesale & retail | 2022 |
| Windsorian Experience Ltd | Real estate | 2019 |
| Winkfield Chauffeurs Limited | Transport & logistics | 2024 |
| Winkfield Place Management Company Limited | Households | 1997 |
| Winner International Education Ltd | Information & communication | 2025 |
| Winprop Services Limited | Real estate | 2019 |
| Winshaw Outsourcing Limited | Professional & scientific | 2013 |
| Winsor Music Academy Limited | Education | 2019 |
| Winsor Piano School Ltd | Other services | 2009 |
| Wish Services Limited | Administrative & support | 2019 |
| Wizards Design Crew Ltd | Information & communication | 2014 |
| WJN Heating Ltd | Construction | 2022 |
| Wolf Lane Ltd | Wholesale & retail | 2019 |
| Wolfpack Studio Ltd | Information & communication | 2024 |
| Wolfwood Industries Ltd | Construction | 2026 |
| Wolvesden Consulting Limited | Information & communication | 2025 |
| Wonder Well Ltd | Arts & recreation | 2021 |
| Woodfellas Carpentry Ltd | Construction | 2023 |
| Woodland Bear Ltd | Wholesale & retail | 2023 |
| Woodleaf Gardens Residents Management Company Limited | Households | 2021 |
| Woodside Road Residents (Amersham) Limited | Households | 1980 |
| Woodstock Estates Holdings Limited | Real estate | 2020 |
| Woodward Financials Limited | Professional & scientific | 2013 |
| Woodys Cafe in the Park Ltd | Hospitality | 2026 |
| Woodys Softplay Ltd | Arts & recreation | 2026 |
| Words & Deeds Limited | Professional & scientific | 2025 |
| Work Revolution Advisory Ltd | Professional & scientific | 2024 |
| WORK360 Limited | Professional & scientific | 2014 |
| Workforce Futures Limited | Administrative & support | 2024 |
| Workplace Health Mot's Limited | Health & social care | 2019 |
| Worldmaidens Performing Arts Limited | Arts & recreation | 2013 |
| Worldwide Education Recruitment Limited | Administrative & support | 2014 |
| Worldwide Entertainment Ltd | Arts & recreation | 2016 |
| Worldwide Live Limited | Arts & recreation | 2013 |
| Worldwide Techservices UK Limited | Manufacturing | 2004 |