| W M Jarvis Ltd | Wholesale & retail | 2014 |
| W S W Transport Ltd | Transport & logistics | 2014 |
| W. Cawrey & Co. Limited | Construction | 2006 |
| Warner Sheppard Limited | Other services | 1995 |
| Waterworks Services Limited | Construction | 2009 |
| Wattisham Property LLP | | 2011 |
| Wattisham Property Management Ltd | Real estate | 2018 |
| Wavewise Crest Digital Limited | Information & communication | 2026 |
| WDT Security Limited | Administrative & support | 2023 |
| Weatherbeeta Limited | Wholesale & retail | 1995 |
| WECOMMUNIC8 Limited | Other services | 2002 |
| Wellingborough Memorial Sports Field Foundation | Other services | 2025 |
| Wellterra Consulting Ltd | Professional & scientific | 2026 |
| Westbury BH Ltd | Transport & logistics | 2025 |
| WG 20 Ltd | Real estate | 2015 |
| White Eagles Investment Group Limited | Real estate | 2023 |
| White House Videos Limited | Administrative & support | 1991 |
| Whizz Bang Group Ltd | Wholesale & retail | 2026 |
| Wildman & Bugby Limited | Wholesale & retail | 1943 |
| Willen Observation Ltd | Arts & recreation | 2025 |
| Willen Winterfest Ltd | Arts & recreation | 2023 |
| William Court (Rushden) Management Company Limited | Real estate | 2005 |
| William Cree & SON Holdings Limited | Professional & scientific | 2022 |
| Willo Roofing Limited | Construction | 2003 |
| Willow Group Management Limited | Professional & scientific | 2024 |
| Wills Surveying & Construction Ltd | Construction | 2023 |
| Win-A-Move Ltd | Transport & logistics | 2026 |
| Winghigh Limited | Administrative & support | 1987 |
| Winton Coachworks Ltd | Wholesale & retail | 2025 |
| Wise Prints Ltd | Wholesale & retail | 2024 |
| Wiyair Limited | Health & social care | 2026 |
| WJS Leadwork and Roofing Ltd | Construction | 2023 |
| Woodbuild Limited | Construction | 2013 |
| Woodchip Energy Ltd | Agriculture & fishing | 2024 |
| Woodford Glass Limited | Manufacturing | 2001 |
| Workdata Ltd | Information & communication | 2022 |
| WOW Fitters Ltd. | Construction | 2017 |
| WP Builders and Renovations Ltd | Construction | 2024 |
| Wrightsparks Electrical Limited | Construction | 2019 |
| Wwms Ltd | Transport & logistics | 2023 |
| X1JPB Ltd | Administrative & support | 2026 |
| Xillox Ltd | Wholesale & retail | 2025 |
| XL Loads Limited | Transport & logistics | 2020 |
| Y D P Limited | Professional & scientific | 1990 |
| Yamac Ltd | Professional & scientific | 2024 |
| Yandii Health Ltd | Health & social care | 2024 |
| YDP Digital Ltd | Professional & scientific | 2020 |
| Yildirir Ltd | Other services | 2019 |
| Yoga for Health and Education Trust | Other services | 2007 |
| Yoko Creative Ltd | Professional & scientific | 2024 |
| Your Fertility Ltd | Health & social care | 2023 |
| ZEN SIX Stays Ltd | Households | 2023 |
| Zingers Chicken Rushden Ltd | Hospitality | 2025 |
| Zingers Rushden Ltd | Hospitality | 2023 |
| ZLM218 Ltd | Hospitality | 2023 |