| Wexham Road Dental Surgery Ltd | Health & social care | 2008 |
| Wexham Road Management Co Ltd | Construction | 2014 |
| Wexham Spice Ltd | Hospitality | 2026 |
| Weyland Corporation Ltd | Wholesale & retail | 2016 |
| Whatsbuyers Limited | Wholesale & retail | 2022 |
| WHB Partners Ltd | Professional & scientific | 2022 |
| Wheel Limited | Information & communication | 2026 |
| Wheels Auto Limited | Wholesale & retail | 2019 |
| Wheels for ALL Ltd | Transport & logistics | 2014 |
| WHEELS4DRIVE Ltd | Wholesale & retail | 2022 |
| Wheelstech Ltd | Wholesale & retail | 2023 |
| Wheely Good Deal Limited | Wholesale & retail | 2023 |
| Whimsywine Limited | Wholesale & retail | 2025 |
| Whippy Bois Ltd | Hospitality | 2024 |
| Whirlwind Water Ltd | Transport & logistics | 2026 |
| Whistle Foods Ltd | Manufacturing | 2019 |
| Whitbread Holdings Ltd | Construction | 2026 |
| Whitby's Family Farm Limited | Agriculture & fishing | 2021 |
| White Clarity Limited | Administrative & support | 2010 |
| White Eagle Services Ltd | Administrative & support | 2023 |
| White Gates Developments Limited | Construction | 2025 |
| White Hill Roofing and Building Ltd | Construction | 2023 |
| White House Care Home Limited | Health & social care | 2022 |
| White JAY AI Strategy Consulting Ltd | Information & communication | 2025 |
| White Leith Limited | Education | 2026 |
| White Lion Amersham Limited | Hospitality | 2025 |
| White Lion Construction Ltd | Construction | 2024 |
| White Marble Designer Ltd | Households | 2025 |
| White Scorpions Logistics Ltd | Other services | 2016 |
| Whitehall (UK) Ltd | Administrative & support | 2012 |
| Whitehouse Projects NO. 1 Ltd | Administrative & support | 2021 |
| Whiterose Construction Group Ltd | Construction | 2022 |
| Whitestone Care Limited | Health & social care | 2008 |
| Whitestone Services Ltd | Real estate | 2025 |
| Whitfor Homes Ltd | Real estate | 2020 |
| Whittington Care Limited | Health & social care | 2020 |
| Whitton Freehold Ltd | Real estate | 2026 |
| Whitton Land Limited | Construction | 2015 |
| Whizeal Technologies Limited | Information & communication | 2016 |
| Whizsys Solutions Ltd | Information & communication | 2012 |
| Whole Earth Foods Limited | Wholesale & retail | 2023 |
| Wholesale Commerce Ltd | Wholesale & retail | 2025 |
| Whowereyou Ltd | Wholesale & retail | 2025 |
| WI Design Ltd | Manufacturing | 2026 |
| Wieslaw Trans Ltd | Transport & logistics | 2019 |
| Wildmoor Homes Ltd | Construction | 2021 |
| Wildwood CR Limited | Real estate | 2015 |
| Wilkinson Sports and Leisure Ltd | Extraterritorial | 2000 |
| William E. Webb (Haulage) Limited | Transport & logistics | 1973 |
| William Verry,Limited | Wholesale & retail | 1934 |
| Willinbrook Healthcare Limited | Health & social care | 2009 |
| Willing to Work Limited | Administrative & support | 2025 |
| Willis Acorn Limited | Financial services | 2014 |
| Willment & Co Ltd | Construction | 2013 |
| Willoughby Road Property Management Limited | Real estate | 2013 |
| Willow & Stone Management Ltd | Real estate | 2026 |
| Willow Klsd Limited | Wholesale & retail | 2017 |
| Willow Parking Ltd | Transport & logistics | 2026 |
| Willows Care Home (Romford) Limited | Health & social care | 2005 |
| Willows Nominee Co 1 Limited | Extraterritorial | 2015 |
| Willows Nominee Co 2 Limited | Extraterritorial | 2015 |
| Wiltshire AVE Property Ltd | Households | 2022 |
| Wiltshire Car and Vans Sales Ltd | Wholesale & retail | 2021 |
| WIN Macro Ltd | Wholesale & retail | 2025 |
| Win-Fit Personal Training Ltd | Arts & recreation | 2020 |
| Winbro Homes Limited | Construction | 2021 |
| Wincast Foundries (Maidenhead) Limited | Real estate | 1970 |
| Windex Tech Ltd | Information & communication | 2012 |
| Windmill Road Residents Limited | Real estate | 2025 |
| Windmill Road RTM Company Limited | Households | 2025 |
| Window Boxes Limited | Administrative & support | 2000 |
| Windowflowers Limited | Administrative & support | 1947 |
| Windrush Automotive Group Limited | Wholesale & retail | 2016 |
| Windrush Garage Limited | Wholesale & retail | 1982 |
| Windrush Maidenhead Limited | Wholesale & retail | 1998 |
| Windrush Trade Parts Limited | Wholesale & retail | 2007 |
| Windsar Care Centre Limited | Health & social care | 2016 |
| Windsar Care Heathlands Ltd | Health & social care | 2022 |
| Windsar Care Homes Egham Ltd | Health & social care | 2019 |
| Windsar Care Limited | Administrative & support | 2009 |
| Windsar Property Limited | Real estate | 2026 |
| Windsor Carriages Ltd | Administrative & support | 2021 |
| Windsor Cars Limited | Transport & logistics | 2008 |
| Windsor Commercial Finance Ltd | Financial services | 2025 |
| Windsor Finance Limited | Financial services | 2022 |
| Windsor Gardens (Langley) Management Company Limited | Households | 1997 |
| Windsor House Freehold Limited | Households | 2020 |
| Windsor Relocation Limited | Real estate | 2010 |
| Windsor Splash Tours Limited | Transport & logistics | 2025 |
| Windyhall Care Home Limited | Health & social care | 2006 |
| Winfit Cargo Ltd | Transport & logistics | 2014 |
| Wings ARE US Ltd | Administrative & support | 2024 |
| Wings Brothers Ltd | Hospitality | 2023 |
| Wings Chauffeur Ltd | Transport & logistics | 2016 |
| Wings Limo Ltd | Information & communication | 2020 |
| Wingsaid Services Limited | Administrative & support | 2026 |
| Winkey Company Limited | Real estate | 2001 |
| Winner Homes Ltd | Construction | 2022 |
| Winsel Spotless Solutions Ltd | Administrative & support | 2024 |
| Winsford Investments Limited | Real estate | 2015 |