| Wise Designs in Glass Limited | Construction | 2013 |
| Wisn Ltd | Health & social care | 2022 |
| Wite Limited | Administrative & support | 2014 |
| With Meraki Limited | Professional & scientific | 2019 |
| With Two Tees Limited | Financial services | 2023 |
| Witham Carpets & Flooring Ltd | Wholesale & retail | 2026 |
| Witham Skip Hire Ltd | Water & waste | 2023 |
| Witham Truck Services Ltd | Wholesale & retail | 2023 |
| Withers Design Associates Limited | Professional & scientific | 2009 |
| WIV Generator Systems Limited | Construction | 2012 |
| Wivenhoe Biodiversity Group Community Interest Company | Arts & recreation | 2026 |
| Wivenhoe Cafe & Gallery Ltd | Hospitality | 2024 |
| Wivenhoe Consulting Limited | Information & communication | 2017 |
| Wivenhoe Film Theatre | Education | 2009 |
| Wivenhoe Library of Things CIC | Administrative & support | 2024 |
| Wivenhoe Pizza Co. Ltd | Hospitality | 2026 |
| Wivenhoe Place Management Company Limited | Households | 2001 |
| Wivenhoe Pre-School | Education | 2011 |
| Wivenhoe Town Regatta Ltd | Other services | 2010 |
| Wivenhoe Youth Choir Ltd | Education | 2022 |
| Wivenhoe, Fingringhoe and Rowhedge Ferry Community Interest Company | Transport & logistics | 2008 |
| WIX Farms Poultry Ltd | Agriculture & fishing | 2019 |
| Wizard AI Ltd | Administrative & support | 2019 |
| Wizard Brickwork Ltd | Construction | 2021 |
| Wizard Cyber Security Ltd | Information & communication | 2017 |
| Wizard Group Limited | Information & communication | 1995 |
| Wizard Information Technology (UK) Limited | Information & communication | 2020 |
| Wizorg Ltd | Other services | 2020 |
| Wizzard Products Ltd | Manufacturing | 2011 |
| WJS UK Group Ltd | Construction | 2015 |
| WKM Electrical Services Ltd | Administrative & support | 2017 |
| WL 2010 Limited | Real estate | 2010 |
| WL Bernard & Sons Ltd | Real estate | 2022 |
| WL View Limited | Real estate | 2024 |
| WL118 Ltd | Real estate | 2023 |
| WL197 Ltd | Hospitality | 2019 |
| WLT Properties Ltd | Real estate | 2015 |
| WLW Construction Limited | Construction | 2014 |
| WLW Projects Limited | Construction | 2025 |
| WM Work Management Limited | Administrative & support | 2019 |
| WM. Wyatt Limited | Real estate | 1950 |
| WML Contractors Limited | Construction | 2025 |
| WMW Education Ltd | Education | 2025 |
| Wogemi Limited | Professional & scientific | 2008 |
| Wokendon Wealth Limited | Administrative & support | 2017 |
| Wolfrace Wheels (UK) Limited | Wholesale & retail | 1989 |
| Women in Boatbuilding CIC | Professional & scientific | 2023 |
| Women in Business Coaching Ltd | Professional & scientific | 2023 |
| Women of Good Works Fellowship Ltd | Other services | 2026 |
| Wongs CO5 Ltd | Hospitality | 2026 |
| Wood & Disney Limited | Professional & scientific | 2001 |
| Wood & Mott Limited | Manufacturing | 1977 |
| Wood & Reynolds Ltd | Professional & scientific | 2023 |
| Wood Bros Holdings Ltd | Real estate | 2025 |
| Wood by Design Limited | Construction | 2022 |
| Wood Dale Management Company Limited | Households | 1981 |
| Wood Dalling Barns Management Company Limited | Real estate | 1993 |
| Wood Group Properties Limited | Real estate | 2024 |
| Wood View (Tiptree) Management Company Ltd | Households | 2008 |
| Woodborough Property Management Limited | Real estate | 2017 |
| Woodbridge Horse Show Society | Arts & recreation | 1992 |
| Woodbridge Medics Ltd | Health & social care | 2019 |
| Woodbridge Prescriptions Limited | Wholesale & retail | 2011 |
| Woodcraft International Limited | Construction | 2024 |
| Wooden Bench Hire Company Limited | Administrative & support | 2013 |
| Woodgett Close Management Company Limited | Households | 2017 |
| Woodhall Consult Limited | Administrative & support | 2026 |
| Woodhill Automotive Limited | Wholesale & retail | 2024 |
| Woodhill Estates Ltd | Construction | 2015 |
| Woodhill Estates Management Ltd | Administrative & support | 2023 |
| Woodhill Property Developments Ltd | Construction | 2019 |
| Woodhouse Property Holdings Ltd | Real estate | 2017 |
| Woodland Barn Ltd | Education | 2002 |
| Woodland Edge Ltd | Agriculture & fishing | 2021 |
| Woodland Heights (Highwoods) Management Company Limited | Households | 1988 |
| Woodland House Daycare Ltd | Education | 2025 |
| Woodlands (Old Costessey) Management Company Limited | Households | 2017 |
| Woodlands Caravan Site (Trimingham) Limited | Hospitality | 1973 |
| Woodman Homes Assets Ltd | Real estate | 2015 |
| Woodman Homes Ltd | Construction | 2018 |
| Woodruff Financial Planning Limited | Financial services | 2016 |
| Woods Holdings Limited | Manufacturing | 2001 |
| Woods Lawns Ltd | Other services | 2023 |
| Woodstock Business Consultants Ltd | Professional & scientific | 2024 |
| Woodstock Global Enterprises Ltd | Professional & scientific | 2018 |
| Woodstock Properties (East of England) Ltd | Real estate | 2021 |
| Woodstock Properties (Wealas) Ltd | Real estate | 2015 |
| Woodstock Property Consultants Ltd | Real estate | 2021 |
| Woodstock Venture Capital Ltd | Real estate | 2018 |
| Woodward Property Maintenance Ltd | Administrative & support | 2026 |
| Woodys GAS Ltd | Wholesale & retail | 2023 |
| Woof Wiggle WAG Limited | Wholesale & retail | 2025 |
| Woolbrass Investment Limited | Real estate | 2023 |
| Woolgar and Sons Limited | Transport & logistics | 2009 |
| Wooltown Ltd | Real estate | 2020 |
| Wooltown Residential Ltd | Real estate | 2020 |
| Woolverstone Management Ltd | Professional & scientific | 2023 |
| Work in Your Work OUT Limited | Arts & recreation | 2017 |
| Work Republic Ltd | Other services | 2024 |
| WORK1 Ltd | Information & communication | 2019 |