| W G King Accountancy Limited | Professional & scientific | 2014 |
| W I Property Services Limited | Construction | 2015 |
| W T Electrical Installations Limited | Construction | 2026 |
| W Willow Limited | Manufacturing | 1970 |
| W.J.Redden and Sons Limited | Wholesale & retail | 1953 |
| W.L.Vallance Limited | Transport & logistics | 1961 |
| W.M. Herdman Manufacturing Co. Limited | Manufacturing | 1960 |
| W.S. Howe and Co. (Wellingborough) Limited | Construction | 1976 |
| W2O Environment Limited | Administrative & support | 2005 |
| Waendel Diagnostics Limited | Professional & scientific | 2015 |
| Wafri Trading Ltd | Wholesale & retail | 2016 |
| Wag&Bone Boutique Ltd | Wholesale & retail | 2024 |
| Wainwright Investments Ltd | Financial services | 2026 |
| Walledge Scaffolding and Building Ltd | Construction | 2021 |
| Wallinger Ltd | Information & communication | 2018 |
| Wallis Payroll Limited | Professional & scientific | 2014 |
| Wally's Way Solutions Ltd | Administrative & support | 2026 |
| Walpar Nutritions Limited | Wholesale & retail | 2023 |
| Walton Marina Limited | Real estate | 1961 |
| Walton Marine Sales Limited | Real estate | 1973 |
| Wambus Limited | Health & social care | 2018 |
| WAN Yaphet Ltd | Health & social care | 2018 |
| Wanafly Airsports Limited | Arts & recreation | 2002 |
| Ward Industries Limited | Wholesale & retail | 1988 |
| Warmonds Hill Investments Ltd | Real estate | 2023 |
| Waronthedancefloor Ltd | Arts & recreation | 2025 |
| Warpath Records Ltd | Wholesale & retail | 2025 |
| Watchful Gaze Limited | Information & communication | 2026 |
| Waterford Incorporated Ltd | Education | 2022 |
| Waterfront Living Ltd | Real estate | 2020 |
| Watermeadow Farm CIC | Agriculture & fishing | 2025 |
| Watermeadow Park Ltd | Hospitality | 2024 |
| Watertwo Ltd | Manufacturing | 2012 |
| Watford Estates and Developments Ltd | Real estate | 2021 |
| Watson & COX (Construction) Limited | Construction | 1985 |
| Watson & COX Holdings Limited | Professional & scientific | 2005 |
| Watson & COX Homes Limited | Construction | 1973 |
| Watson & COX Limited | Construction | 1971 |
| Watts UP for Rent Ltd | Real estate | 2021 |
| Waxandmelt Limited | Wholesale & retail | 2019 |
| Waymaker Projects Limited | Real estate | 2025 |
| WCD Management Limited | Real estate | 2017 |
| WDC Software Limited | Information & communication | 2026 |
| WE ARE Renovating Your House Ltd | Construction | 2020 |
| WE Clean Hvac Ltd | Administrative & support | 2025 |
| WE Really DO Care Ltd | Health & social care | 2025 |
| WE Surface IT Ltd | Construction | 2016 |
| Wealth Makers Limited | Administrative & support | 2025 |
| Wealthy Without Worry Ltd | Wholesale & retail | 2025 |
| Weatherbys Bank Holdings Limited | Financial services | 2005 |
| Weatherbys Continuation Limited | Extraterritorial | 1982 |
| Weatherbys Solutions Ltd | Extraterritorial | 2006 |
| Weatherbys Thoroughbred Holdings Limited | Professional & scientific | 2005 |
| Weatherbys Ventures Holdings Limited | Extraterritorial | 2005 |
| Weatherbys Ventures Limited | Extraterritorial | 1997 |
| Weber Talma (Leasehold ) Limited | Real estate | 2021 |
| Weber Talma Commercial Limited | Real estate | 2021 |
| Websites by Design Ltd | Professional & scientific | 2024 |
| Webster Groundworks Limited | Construction | 2025 |
| Webuild Brickwork Limited | Construction | 2026 |
| Webun Limited | Hospitality | 2022 |
| Wedocars Limited | Wholesale & retail | 2014 |
| Wedohire Limited | Wholesale & retail | 2014 |
| Wedoplant Limited | Wholesale & retail | 2014 |
| Wedotools Limited | Wholesale & retail | 2014 |
| Weir Publishing Ltd | Information & communication | 2016 |
| Welcome Barber Hasi Ltd | Other services | 2019 |
| Weldon Supermarket Limited | Wholesale & retail | 2010 |
| Welkon Limited | Wholesale & retail | 2017 |
| Wellingborough African Caribbean Association Ltd | Health & social care | 1996 |
| Wellingborough Afro-Caribbean Leisure Co. Limited | Hospitality | 1997 |
| Wellingborough Building Company Limited | Construction | 1974 |
| Wellingborough Building Solutions Limited | Construction | 2025 |
| Wellingborough CUE Sports Ltd | Hospitality | 2018 |
| Wellingborough Door Company Limited | Other services | 2007 |
| Wellingborough Drainage Limited | Administrative & support | 2017 |
| Wellingborough E Store Limited | Wholesale & retail | 2025 |
| Wellingborough Eco Group Community Interest Company | Other services | 2025 |
| Wellingborough Family Hostels Limited | Health & social care | 2002 |
| Wellingborough Fast Food Ltd | Hospitality | 2024 |
| Wellingborough Golf Club Company Limited | Arts & recreation | 1922 |
| Wellingborough Grange Management Limited | Administrative & support | 2024 |
| Wellingborough Leisure Limited | Arts & recreation | 2012 |
| Wellingborough Masonic Hall Company,Limited(The) | Arts & recreation | 1904 |
| Wellingborough Nails Ltd | Other services | 2024 |
| Wellingborough Plumbing and Heating Services Limited | Construction | 2014 |
| Wellingborough Property Investment Ltd | Real estate | 2025 |
| Wellingborough Property Limited | Real estate | 2024 |
| Wellingborough Property Rentals Limited | Real estate | 2016 |
| Wellingborough School Enterprise Limited | Wholesale & retail | 1981 |
| Wellingborough Town Centre Partnership Limited | Other services | 2002 |
| Wellingborough Walks Action Group Limited | Other services | 2023 |
| Wemwell Ltd | Real estate | 2024 |
| Wendleberrie Care Ltd | Health & social care | 2012 |
| Wendleberrie Services Ltd | Professional & scientific | 2015 |
| WER Management Ltd | Professional & scientific | 2025 |
| Wergab Ltd | Transport & logistics | 2023 |
| West Business Consulting Ltd | Wholesale & retail | 2014 |
| Western Rhino Joinery Ltd | Construction | 2024 |
| Westfield Bathrooms and Plumbing Supplies Ltd | Wholesale & retail | 2021 |