| Whites Nurseries Limited | Wholesale & retail | 2014 |
| Whites of Earls Barton Limited | Extraterritorial | 2020 |
| Whites Residential Lettings Ltd | Administrative & support | 2005 |
| Whites Security Ltd | Hospitality | 2024 |
| Whitewater Consulting Services Limited | Professional & scientific | 2021 |
| Whitford Holdings Ltd | Real estate | 2019 |
| Whitlock Investment Company Limited | Real estate | 2024 |
| Whitlyton Limited | Wholesale & retail | 2022 |
| Whitmore Bacon Limited | Wholesale & retail | 1962 |
| Whitney Developments Limited | Construction | 2014 |
| Whitstone Digital Consulting Ltd | Information & communication | 2024 |
| Whittle Group Ltd | Wholesale & retail | 2023 |
| Whittlebury Investments Limited | Construction | 2020 |
| Whittlewood Holdings Ltd | Financial services | 2026 |
| Whittlewood Media Ltd | Professional & scientific | 2021 |
| Whittlewood Properties Ltd | Real estate | 2026 |
| Whitton Day Nursery Limited | Education | 2010 |
| Whitworth Bros.Limited | Manufacturing | 1949 |
| Whiz Creative Limited | Arts & recreation | 2019 |
| Whmb Ltd | Households | 2021 |
| Wholesale Supplements Ltd | Wholesale & retail | 2025 |
| Wholesome Impact Real Estate Limited | Real estate | 2023 |
| WHS Building Surveying Limited | Extraterritorial | 2000 |
| Whyatt-Sames Ltd | Professional & scientific | 2021 |
| Whyteluxe Ltd | Wholesale & retail | 2025 |
| Wicare Services Ltd | Health & social care | 2016 |
| Wickersley Dental Practice Limited | Health & social care | 2011 |
| Wicks Controls Services Limited | Manufacturing | 2015 |
| Widenit Ltd | Information & communication | 2018 |
| Wieducate Ltd | Education | 2020 |
| Wienkamp Technical Translations Ltd | Education | 2010 |
| WIG & Hair Lounge Limited | Other services | 2022 |
| Wiggins & Co.Limited | Construction | 1919 |
| Wight Marine Limited | Professional & scientific | 2017 |
| Wigorex Ltd | Wholesale & retail | 2011 |
| Wihtgar Limited | | 1925 |
| Wilby Fabrications Limited | Manufacturing | 2003 |
| Wilch Group Limited | Financial services | 2019 |
| Wilcox Properties Ltd. | Real estate | 2001 |
| Wild Serenity Moon Ltd | Extraterritorial | 2024 |
| Wild Whiskers Ltd | Wholesale & retail | 2025 |
| Wild Wild West Limited | Construction | 2023 |
| Wilderness Explorers Ltd | Education | 2020 |
| Wildflower Weightloss Ltd | Health & social care | 2022 |
| Wildflowers MK Ltd | Professional & scientific | 2025 |
| Wildgoose (Marston Montgomery) Limited | Construction | 2016 |
| Wildgoose Homes Limited | Construction | 2015 |
| Wildlings Preschool Ltd | Education | 2021 |
| Wildswann Ltd | Hospitality | 2024 |
| Wiles Studios Ltd | Other services | 2022 |
| Wilfords Auctioneers Limited | Wholesale & retail | 2016 |
| Wilfred Robinson (Pyewipe) Limited | Agriculture & fishing | 2000 |
| Wilgarde Limited | Financial services | 2010 |
| Wilhelm Estates Ltd | Financial services | 2026 |
| Wilkins Building Services Limited | Construction | 2023 |
| Wilkinson Premier Property LLP | | 2025 |
| Wilksett Property Ltd. | Real estate | 2019 |
| Will Clean - Drainage Ltd | Administrative & support | 2022 |
| Will MAC Racing Limited | Arts & recreation | 2023 |
| Will Pollard Design & Build Limited | Administrative & support | 2025 |
| Will Power LB Ltd | Construction | 2021 |
| Willark Ltd | Professional & scientific | 2026 |
| William Arnold Associates Limited | Professional & scientific | 1982 |
| William James and Co. (Property Investments) Limited | Professional & scientific | 1965 |
| William Morgan Properties Limited | Real estate | 2011 |
| William Spencer Property Investors Limited | Real estate | 2024 |
| William Weston Gallery Limited | Wholesale & retail | 1968 |
| Williams Bros Racing UK Ltd | Wholesale & retail | 2023 |
| Williams Legal Services Ltd | Professional & scientific | 2011 |
| Williams Street Limited | Financial services | 2019 |
| Willie K Enterprise Ltd | Wholesale & retail | 2018 |
| Willis IT Services Limited | Information & communication | 2014 |
| Willotts Limited | Wholesale & retail | 2013 |
| Willoughby Ansell Limited | Professional & scientific | 2013 |
| Willoughby Developments Limited | Construction | 2024 |
| Willow Brook (Daventry) Management Company Limited | Households | 2020 |
| Willow Care & Support Ltd | Health & social care | 2014 |
| Willow Carpentry Services Limited | Manufacturing | 2020 |
| Willow Communications Limited | Information & communication | 1989 |
| Willow Consultants Limited | Professional & scientific | 2026 |
| Willow Court (Lutterworth) Limited | Administrative & support | 2007 |
| Willow Domiciliary Care Limited | Extraterritorial | 2015 |
| Willow Gardens Management Company Limited | Households | 2016 |
| Willow Grove (Wixams) Management Company Limited | Households | 2017 |
| Willow Joinery Suppliers of Excellence Limited | Manufacturing | 2002 |
| Willow Photonics Limited | Professional & scientific | 2007 |
| Willow Plumbing & Heating Limited | Construction | 2005 |
| Willow Properties Investments Limited | Real estate | 2020 |
| Willow Sports Limited | Administrative & support | 2017 |
| Willow Tree Live in Care Ltd | Health & social care | 2025 |
| Willow Tree Sales Ltd | Construction | 2023 |
| Willow Wren Hire Cruisers Limited | Arts & recreation | 1964 |
| Willow Wren Limited | Arts & recreation | 2022 |
| Willow's Walkies Ltd | Other services | 2026 |
| Willowbrook Healthcare Debtco Limited | Financial services | 2008 |
| Willowbrook Healthcare Developments Limited | Construction | 2008 |
| Willowbrook Healthcare Group Limited | Financial services | 2013 |
| Willowbrook Healthcare Limited | Professional & scientific | 2008 |
| Willowtree Partners Limited | Real estate | 2024 |
| Willowvale Care Children Services Limited | Health & social care | 2024 |