| Whyn Ltd | Wholesale & retail | 2023 |
| Wickford Cars Ltd | Wholesale & retail | 2012 |
| Wickford Nova Management Co Ltd | Real estate | 2025 |
| Wickford Pharmacy Limited | Wholesale & retail | 2025 |
| Wide Awake Coffee Essex Ltd | Hospitality | 2024 |
| Wild Bookkeeping Ltd | Professional & scientific | 2021 |
| Wild Stretch Limousines Ltd | Transport & logistics | 2010 |
| Wildfox Developments Limited | Construction | 2023 |
| Wildhire Ltd | Administrative & support | 2018 |
| Wildinput Limited | Construction | 2002 |
| Wildlingways Property Consultants Ltd | Real estate | 2024 |
| Wildlingways Transformations Ltd | Real estate | 2024 |
| Will D Consultants Limited | Wholesale & retail | 2022 |
| Willards (UK) Ltd | Other services | 2013 |
| Willats Stansby Holdings Ltd | Real estate | 2021 |
| William Collings & Sons Limited | Construction | 2019 |
| William Nelson Limited | Construction | 1999 |
| William Penn Ltd | Real estate | 2025 |
| William Searing Close Limited | Households | 2007 |
| Willis & Walker Properties Ltd | Real estate | 2025 |
| Willow (Goodlands) Limited | Extraterritorial | 2020 |
| Willowfield Pre-School Limited | Education | 2010 |
| Willows Recruitment Limited | Administrative & support | 2005 |
| Wills Party Walls Ltd | Professional & scientific | 2026 |
| Willvito Homes Ltd | Construction | 2019 |
| Wilson and Sons Decorators Limited | Construction | 2021 |
| Wilson Tyler Ltd | Real estate | 2020 |
| Wilson's Careers Limited | Administrative & support | 2015 |
| Winamazing Limited | Administrative & support | 2023 |
| Wind Song Theatre Ltd | Arts & recreation | 2024 |
| Windermere Social Club Holdings Ltd | Financial services | 2024 |
| Windmill Green Place Management Company Limited | Households | 2007 |
| Window Magician Ltd | Construction | 2015 |
| Window Repair Magician Ltd | Construction | 2014 |
| Windowfixessex Ltd | Construction | 2023 |
| Windowmist Limited | Construction | 2001 |
| Windsor French Polishers & Spray Finishers Limited | Construction | 2011 |
| WINE2TRADE Limited | Wholesale & retail | 2013 |
| Winger Sports Academy Limited | Arts & recreation | 2013 |
| Wire Rigging Consultants Ltd | Extraterritorial | 2020 |
| Wise Digital Media Limited | Information & communication | 2016 |
| Wishbone Publishing Limited | Information & communication | 2013 |
| WJP Residential Ltd | Real estate | 2023 |
| WJT Construction Ltd | Construction | 2022 |
| WJT Developments Ltd | Construction | 2022 |
| WJT Properties Ltd | Construction | 2022 |
| WKB Distribution Ltd | Wholesale & retail | 2024 |
| Wkdm Properties Limited | Real estate | 2015 |
| WMG Flooring Ltd | Construction | 2026 |
| Woldcott Property Limited | Real estate | 2024 |
| WOM Slate 2 Ltd | Information & communication | 2023 |
| WOO Hair Ltd | Other services | 2018 |
| Woodcraft Carpentry Contractors Limited | Construction | 2019 |
| Woodgrange Developments UK Ltd | Construction | 2008 |
| Woodhead Advisory Limited | Professional & scientific | 2020 |
| Woodhouse Projects (Kent) Limited | Construction | 2019 |
| Woodhouse Projects Limited | Construction | 2016 |
| Woodlands Club 25 Limited | Hospitality | 2025 |
| Woodside Construction & Maintenance Ltd | Construction | 2022 |
| Woodside Electrical & Security Limited | Construction | 2012 |
| Work Numbers Ltd | Information & communication | 2023 |
| World House of Peri Peri Ltd | Hospitality | 2025 |
| World of Mice Ltd | Information & communication | 2023 |
| World of Triathlon Media Limited | Administrative & support | 2024 |
| Worldwide Holidays Solutions Ltd | Administrative & support | 2019 |
| Worsley Wines Limited | Wholesale & retail | 2011 |
| WP Land Property Rentals & Building Ltd | Construction | 2025 |
| WRB Construction Limited | Construction | 2014 |
| Wright Insight Ltd | Professional & scientific | 2019 |
| Writing IT Right Limited | Professional & scientific | 2020 |
| WRS Specialised Works Limited | Other services | 2008 |
| WTH Management Ltd | Real estate | 2021 |
| WW Construction & Refurbishments Ltd | Construction | 2023 |
| Wxtours Ltd | Administrative & support | 2025 |
| WYD Ltd | Hospitality | 2016 |
| Wytec Electrical Limited | Manufacturing | 2003 |
| Wyvil Road Properties Limited | Construction | 2020 |
| Xclusive Sneaks Limited | Wholesale & retail | 2017 |
| XGS Systems Limited | Administrative & support | 2006 |
| Xicare Limited | Health & social care | 2016 |
| XS Furniture (Essex) Ltd | Wholesale & retail | 2023 |
| XS Homes Ltd | Construction | 2023 |
| XS Homes Willows Limited | Construction | 2024 |
| Xvavi Limited | Professional & scientific | 2018 |
| Xvavi Studio Limited | Professional & scientific | 2022 |
| Y B Construction Services Limited | Construction | 2021 |
| YD Health Tourism Limited | Professional & scientific | 2025 |
| Yellow Leaf Holdings Limited | Real estate | 2024 |
| YES Financial Services Limited | Financial services | 2007 |
| YK Properties (Essex) Ltd | Real estate | 2023 |
| Ykmp Global Limited | Real estate | 2024 |
| YLS Ltd | Professional & scientific | 2015 |
| YO Lisas Feast Ltd | Hospitality | 2024 |
| Yoga 15 Limited | Health & social care | 2026 |
| Yoha Limited | Arts & recreation | 1996 |
| Yoji Properties Limited | Real estate | 2023 |
| York Hadleigh Limited | Financial services | 2002 |
| Young Ballerz Basketball Franchising Limited | Professional & scientific | 2025 |
| Young Ballerz Basketball Limited | Arts & recreation | 2020 |
| Your Familyasset Limited | Financial services | 2022 |