| Wood Farm Developments Ltd | Construction | 2019 |
| Wood Hall Barns Suffolk Limited | Real estate | 2022 |
| Wood Subsurface Ltd | Mining & quarrying | 2024 |
| Woodbank Timber Ltd | Wholesale & retail | 2011 |
| Woodbridge & District Motor Cycle Club Limited | Arts & recreation | 1983 |
| Woodbridge Art Club Ltd | Arts & recreation | 2022 |
| Woodbridge Carpentry & Timberframe EA Ltd | Manufacturing | 2018 |
| Woodbridge Dining Limited | Hospitality | 2024 |
| Woodbridge ENG. Company Limited | Wholesale & retail | 1969 |
| Woodbridge Glens Property Limited | Real estate | 2021 |
| Woodbridge Heating Services Limited | Construction | 2012 |
| Woodbridge Medical Services Limited | Health & social care | 2010 |
| Woodbridge Properties Limited | Real estate | 2003 |
| Woodbridge Riverside Trust | Other services | 2008 |
| Woodbridge Road Laundry Ltd | Other services | 2024 |
| Woodbridge Road Turkish Barber Ltd | Other services | 2023 |
| Woodbridge Suffolk Group Ltd | Real estate | 2025 |
| Woodbridge Valeting Ltd | Other services | 2024 |
| Woodcock & SON Limited | Real estate | 2023 |
| Woodcock Land Developments Ltd | Construction | 2026 |
| Woodford Riverside Marina Limited | Arts & recreation | 2015 |
| Woodhouse Industries Limited | Professional & scientific | 1989 |
| Woodhouse Literary and Rights Limited | Other services | 2016 |
| Woodland Pathways Ltd | Education | 2026 |
| Woodlands Consultancy Limited | Information & communication | 2002 |
| Woodlands Farm Shop Ltd | Wholesale & retail | 2021 |
| Woodlands Nursery Partnership Limited | Health & social care | 2025 |
| Woodride Limited | Administrative & support | 2025 |
| Woodsmoke Dreams Ltd. | Hospitality | 2016 |
| Woodstone Funding Limited | Administrative & support | 2009 |
| Woodward Markwell Financial Advisers Ltd | Financial services | 1990 |
| Woodward Markwell Holdco a Limited | Financial services | 2021 |
| Woodward Markwell Holdings Limited | Financial services | 2018 |
| Woodward Markwell Insurance Brokers Holdings Limited | Financial services | 2011 |
| Woodward Markwell Limited | Professional & scientific | 1991 |
| Woodwork Carpenters Ltd | Construction | 2025 |
| Woodworks Carpentry Limited | Construction | 2015 |
| Woodworx Carpentry & Kitchens Limited | Construction | 2025 |
| Woodya Clothing Limited | Manufacturing | 2020 |
| Woof and Co. Maldon Limited | Wholesale & retail | 2021 |
| Woof and Purr Ltd | Wholesale & retail | 2021 |
| Woollando Limited | Wholesale & retail | 2025 |
| Woolly Crafts Ltd | Wholesale & retail | 2022 |
| Woolverstone Advisory Limited | Professional & scientific | 2025 |
| Woolverstone Holdings Ltd | Financial services | 2025 |
| Woolverstone Land Limited | Agriculture & fishing | 2019 |
| Woolverstone Restaurants Limited | Hospitality | 2018 |
| Woolverstone Yards Limited | Real estate | 2026 |
| Woqen Ltd | Information & communication | 2018 |
| Wordence Limited | Information & communication | 2025 |
| Wordfish Ltd | Information & communication | 2007 |
| Workclocking Ltd | Information & communication | 2025 |
| Workforce Bridge Enterprise Ltd | Administrative & support | 2026 |
| Workforit Ltd | Transport & logistics | 2018 |
| Workfox U.K. Limited | Mining & quarrying | 1991 |
| Workhouse (UK) Limited | Wholesale & retail | 1999 |
| Workxflow Ltd | Information & communication | 2021 |
| World Haulage Ltd | Administrative & support | 2010 |
| World of Insoles Ltd | Wholesale & retail | 2022 |
| Worldadtrader.Com Limited | Information & communication | 2005 |
| Worlds Fastest Accountant Ltd | Arts & recreation | 2023 |
| Worldsensing Limited | Wholesale & retail | 2013 |
| Worldwide Consulting Works Limited | Manufacturing | 2014 |
| Worldwide Property Finders Ltd | Real estate | 2021 |
| WOT Go on Ltd | Information & communication | 2020 |
| Wot's UP C.I.C. | Health & social care | 2014 |
| Wowsa Ltd | Information & communication | 2021 |
| WP Fencing and Landscaping Limited | Construction | 2022 |
| WP Property Finance Limited | Financial services | 2011 |
| WPK Systems Limited | Information & communication | 2008 |
| Wpwebtech Limited | Information & communication | 2018 |
| Wrabness Moorings Limited | Arts & recreation | 1997 |
| Wren Recruitment Ltd | Administrative & support | 2024 |
| Wright & Fuller Limited | Construction | 1967 |
| Wright & Robinson Carpentry Contracts Ltd | Construction | 2011 |
| Wright and Wythe Construction Limited | Construction | 2017 |
| Wright Installations UK Limited | Construction | 2025 |
| Wright Track Ideas Limited | Professional & scientific | 2021 |
| Wright Ways Gym Ltd | Arts & recreation | 2025 |
| Wrightpart Holdings Limited | Professional & scientific | 2003 |
| Wrightside Limited | Administrative & support | 2002 |
| WRM Agri Ltd | Agriculture & fishing | 2016 |
| WRM Biomass Ltd | Agriculture & fishing | 2019 |
| WRTC2026 CIC | Arts & recreation | 2023 |
| WS Logistics Limited | Transport & logistics | 2002 |
| WSH Anglian Larder Limited | Extraterritorial | 2018 |
| WSM Recycling Limited | Water & waste | 2006 |
| WSM Spares & Salvage Limited | Water & waste | 2006 |
| WT Property Development Ltd | Construction | 2023 |
| Wvdp Ltd | Financial services | 2021 |
| WWN Investments Ltd | Wholesale & retail | 2018 |
| Wyndham Group Limited | Transport & logistics | 2012 |
| Wyrd Flora Ltd | Arts & recreation | 2020 |
| X68 Ltd | Wholesale & retail | 2026 |
| Xceed EA Ltd | Construction | 2024 |
| Xcel Properties Limited | Real estate | 2020 |
| Xcell Heating and Plumbing Solutions Ltd | Construction | 2022 |
| Xcellent Management Ltd | Wholesale & retail | 2022 |
| Xecure Limited | Professional & scientific | 2025 |
| Xeni Co Limited | Professional & scientific | 2019 |