| Whale Leasing Ltd | Financial services | 2026 |
| What the Truck MK Ltd | Hospitality | 2026 |
| Wheatfield Limited | Wholesale & retail | 2011 |
| Wheel Brokers UK Ltd | Wholesale & retail | 2007 |
| Wheel City Limited | Wholesale & retail | 2013 |
| Wherefrom Ltd | Information & communication | 2019 |
| Whetton's Fire Protection Ltd | Construction | 2026 |
| Whipperley Academy Trust | Education | 2012 |
| Whipsnade Park Homes Limited | Construction | 1963 |
| Whipsnade Systems Limited | Professional & scientific | 2013 |
| White Arrow Technology Limited | Information & communication | 2024 |
| White Barrel London Limited | Wholesale & retail | 2026 |
| White Feather Essentials Limited | Wholesale & retail | 2019 |
| White Label Solutions Ltd | Professional & scientific | 2023 |
| White Powick Ltd | Hospitality | 2020 |
| White Rose Consultants Limited | Construction | 2021 |
| White Store International Ltd | Information & communication | 2019 |
| White Tiger Productions Limited | Information & communication | 2023 |
| Whitecastle Mansions Management Company Limited | Households | 2015 |
| Whitehill Estates Luton Limited | Real estate | 2024 |
| Whiteley Fischer Limited | Manufacturing | 1954 |
| Whiteoak Innovations Limited | Health & social care | 2025 |
| Whittaker & Company (Harpenden) Limited | Real estate | 2018 |
| Whittaker & Company (Land & New Homes ) Limited | Professional & scientific | 2021 |
| Whittaker Plane Ltd | Professional & scientific | 2014 |
| Whitwell HOO Management Company Limited | Households | 1992 |
| Whizz Funding Limited | Financial services | 2024 |
| WHL Investments Limited | Real estate | 2016 |
| WHM Private Ltd | Wholesale & retail | 2024 |
| Wholesale Beauty Limited | Wholesale & retail | 2025 |
| Wholistic Health Ltd | Health & social care | 2011 |
| Whtg Hospitality Limited | Hospitality | 2016 |
| Whtg Ltd | Hospitality | 2020 |
| WHY Sales International Limited | Professional & scientific | 2016 |
| Whyco Ltd | Wholesale & retail | 2019 |
| WI Jammin's Catering Limited | Hospitality | 2018 |
| Wian Global Limited | Information & communication | 2024 |
| Wickersley Motors Ltd | Wholesale & retail | 2022 |
| Wickharmony Ltd | Manufacturing | 2025 |
| Wide Range Roofing Ltd | Construction | 2025 |
| Wide Roofing Ltd | Construction | 2018 |
| Widras Limited | Wholesale & retail | 2018 |
| Wiggy Wings Ltd | Hospitality | 2024 |
| Wigmore Lane Flats NO. 2 (Luton) Limited | Households | 1977 |
| Wigmore Lane Flats NO. 3 (Luton) Limited | Households | 1977 |
| Wigmore MOT Centre Limited | Other services | 2017 |
| Wigmore Security Services Ltd | Administrative & support | 2023 |
| Wigmoreflooring Limited | Construction | 2014 |
| Wiland Limited | Real estate | 2023 |
| Wild & Native Properties Ltd | Real estate | 2021 |
| Wilde Productions Limited | Arts & recreation | 2010 |
| Wildeideaz Limited | Administrative & support | 2007 |
| Wilk Construction Ltd | Construction | 2021 |
| Wilkes Walk Limited | Extraterritorial | 2018 |
| Wilks & Associates Ltd | Construction | 2022 |
| Will Nest Limited | Other services | 2025 |
| Willen Consultancy Limited | Professional & scientific | 2024 |
| William Cater (Letchworth) Limited | Real estate | 1951 |
| William E Henley Management Services Ltd | Professional & scientific | 2018 |
| William E Henley Property Services Ltd | Real estate | 2021 |
| William Green Surveyors Limited | Professional & scientific | 1990 |
| William Tech Limited | Construction | 2014 |
| William UK Construction Limited | Construction | 2017 |
| Williams and Sleeve Limited | Wholesale & retail | 2026 |
| Williams Contract Cleaning Limited | Administrative & support | 2018 |
| Williams Property Investor Ltd | Real estate | 2022 |
| Williamsons&Brothers Ltd | Administrative & support | 2024 |
| Willis Private Clients Ltd | Extraterritorial | 2020 |
| Willowfield Limited | Real estate | 1981 |
| Willowkey Homes Ltd | Real estate | 2026 |
| Willus Staffing Services Ltd | Administrative & support | 2010 |
| Wilmanaa Limited | Professional & scientific | 2022 |
| Wilmont Construction Limited | Construction | 2018 |
| Wilmore Care Ltd | Health & social care | 2022 |
| Wilton Finch Ltd | Real estate | 2019 |
| Wilton Hall Ltd | Hospitality | 2021 |
| WIN Traders Ltd | Wholesale & retail | 2026 |
| Winchi Limited | Wholesale & retail | 2026 |
| Wind Road Service Station Ltd | Wholesale & retail | 2009 |
| Windmill Hill Estates Ltd | Real estate | 2025 |
| Windowpainsuk Limited | Construction | 2013 |
| Windowparts Limited | Wholesale & retail | 1998 |
| Windowparts Trustees Limited | Professional & scientific | 2023 |
| Windrift Ltd | Construction | 2011 |
| Windscreensdoctor Ltd | Wholesale & retail | 2023 |
| Windy Night Beauty Ltd | Wholesale & retail | 2024 |
| Winecorp Limited | Wholesale & retail | 2007 |
| Wing Hill Limited | Hospitality | 2019 |
| Wingate Management Company (Luton) Limited | Households | 1982 |
| Wingman Support Services CIC | Health & social care | 2023 |
| Wingrave One Limited | Construction | 2012 |
| Wingrave Two Limited | Construction | 2012 |
| Wink Online Ltd | Wholesale & retail | 2025 |
| Winston Marriot Ltd | Wholesale & retail | 2014 |
| Wintech Innovations PVT Ltd | Manufacturing | 2025 |
| Wirecase Limited | Professional & scientific | 2006 |
| Wisaal Ltd | Administrative & support | 2016 |
| Wisdom Cleaning Ltd | Administrative & support | 2021 |
| Wisdom Innovations Ltd | Education | 2024 |
| Wise & Co UK Ltd | Professional & scientific | 2018 |