| Watson Midco Limited | Financial services | 2025 |
| Watson Topco Limited | Financial services | 2025 |
| Waveland Limited | Real estate | 1993 |
| Waxd Ltd | Wholesale & retail | 2026 |
| WE ARE Relish Limited | Professional & scientific | 2015 |
| WE ARE Wonder Limited | Administrative & support | 2014 |
| WE Buy IT ALL Ltd | Wholesale & retail | 2009 |
| Webb & Clark Property Ltd | Real estate | 1946 |
| Weeks Trailers Limited | Professional & scientific | 2001 |
| Wehost Ltd | Arts & recreation | 2010 |
| Weldcraft Engineering Ltd | Manufacturing | 2025 |
| Wellfare Builders Ltd | Construction | 2020 |
| WHD Microanalysis Consultants Limited | Professional & scientific | 1987 |
| Wheatcroft Limited | Real estate | 1999 |
| Whinfield Game Farm Limited | Agriculture & fishing | 2012 |
| Whirlwind Tuelu Ltd | Financial services | 2022 |
| Whistlestop Cafe Woodbridge Limited | Hospitality | 2012 |
| White City Osteopaths Ltd | Health & social care | 2024 |
| White Hart Court Limited | Households | 2005 |
| White Oaks (Darsham) Ltd | Wholesale & retail | 2021 |
| Whitelodge (Suffolk) Limited | Professional & scientific | 2010 |
| Whittle ARC Limited | Professional & scientific | 2011 |
| Whitwell House Management Company Ltd | Administrative & support | 2016 |
| Whitworth Veterinary Practice Limited | Professional & scientific | 2002 |
| Wickham Market Dental Practice Limited | Health & social care | 2014 |
| Wickham Market Medical Centre Ltd. | Wholesale & retail | 2003 |
| Wickham Properties Ltd | Real estate | 2026 |
| Wickham Spice Limited | Hospitality | 2022 |
| WIL Global Ltd | Information & communication | 2024 |
| Wild Pursuits Guiding Limited | Agriculture & fishing | 2023 |
| Will Freeman Angling Limited | Wholesale & retail | 2002 |
| Will Morris Ltd | Information & communication | 2021 |
| Willbhot Ltd | Manufacturing | 2024 |
| Willerby Database Management Limited | Information & communication | 2011 |
| William Frank Pooley Limited | Health & social care | 2018 |
| William Notcutt Estates Limited | Agriculture & fishing | 2011 |
| Williams & Co Accountancy Services Ltd | Professional & scientific | 2003 |
| Willow Homes Suffolk Ltd | Construction | 2024 |
| Willow Tree Yard Limited | Households | 2019 |
| Wilson Infrastructure Ltd. | Real estate | 2015 |
| Wines of Interest Limited | Wholesale & retail | 2000 |
| Winfield Farms Limited | Agriculture & fishing | 2013 |
| Winnthinking Limited | Professional & scientific | 2011 |
| Winro Limited | Real estate | 2000 |
| Wm.Kerr (Farms) Limited | Agriculture & fishing | 1954 |
| WN Estates (Holdings) Ltd | Financial services | 2018 |
| WN Estates (Norfolk) Limited | Hospitality | 2012 |
| WN Estates 2020 Limited | Extraterritorial | 2020 |
| Wolton Engineering Limited | Construction | 2007 |
| Wonderpost Ltd | Wholesale & retail | 2016 |
| Wood Farm Badingham Limited | Agriculture & fishing | 2022 |
| Woodbridge a Barber Ltd | Other services | 2026 |
| Woodbridge Ambient Music Festival CIC | Arts & recreation | 2025 |
| Woodbridge Barbers Ltd | Other services | 2026 |
| Woodbridge Business Centre Limited | Professional & scientific | 2004 |
| Woodbridge Company Secretarial Services Limited | Administrative & support | 2004 |
| Woodbridge Construction Hire Ltd | Administrative & support | 2011 |
| Woodbridge Deli Ltd | Wholesale & retail | 2015 |
| Woodbridge Dental Care Ltd | Health & social care | 2023 |
| Woodbridge Golf Club Limited | Hospitality | 2020 |
| Woodbridge International Developments Limited | Construction | 2007 |
| Woodbridge Landscapes Limited | Administrative & support | 2011 |
| Woodbridge Marine Limited | Professional & scientific | 2017 |
| Woodbridge Quality Ltd | Hospitality | 2025 |
| Woodbridge Quay Company Limited | Transport & logistics | 1959 |
| Woodbridge Quay Holding Company Limited | Financial services | 2015 |
| Woodbridge Rugby Union Football Club Limited | Arts & recreation | 2013 |
| Woodbridge Trading Company Ltd | Wholesale & retail | 2020 |
| Woodbridge West Residents Company Limited | Households | 2004 |
| WOODBRIDGE16 Ltd | Hospitality | 2026 |
| Woolf Marine Group Ltd | Financial services | 2026 |
| Working Order Limited | Hospitality | 2019 |
| World Peace Technology Ltd | Other services | 2020 |
| Worldpoint Limited | Real estate | 1979 |
| Worldwide Trading Room Consultancy Ltd. | Professional & scientific | 1998 |
| Worlingworth Hall Farm Ltd | Agriculture & fishing | 2019 |
| Worlingworth Hall Livery Ltd | Agriculture & fishing | 2020 |
| Worlingworth Swan Limited | Wholesale & retail | 2022 |
| Wrentham Farms Limited | Hospitality | 1964 |
| Wrights Retail Limited | Wholesale & retail | 2008 |
| WYK Holdings Limited | Professional & scientific | 2022 |
| Xela Clip Limited | Professional & scientific | 2023 |
| Yapp Capital Management Ltd. | Wholesale & retail | 2020 |
| Yarn Hill Estates Limited | Households | 2022 |
| Yates Electronics Limited | Manufacturing | 1977 |
| Yates Homes Limited | Real estate | 2005 |
| YC Turkuaz Limited | Hospitality | 2019 |
| Yellow Shoes Ltd | Information & communication | 2021 |
| Yoga Sense Collective Ltd | Health & social care | 1995 |
| Your Property Partner Limited | Households | 2003 |
| Your Village Store Limited | Wholesale & retail | 2006 |
| YOX Box Ltd | Wholesale & retail | 2020 |
| Zambian Horse Power UK Limited | Transport & logistics | 2015 |
| ZIP NFC Limited | Information & communication | 2012 |
| Zitan Capital Ltd | Financial services | 2026 |
| ZRG Capital Limited | Construction | 2021 |
| Zrsb Marketing Limited | Professional & scientific | 2021 |