| Volaro Studios Ltd | Information & communication | 2025 |
| Voodoo Lemon Ltd | Professional & scientific | 2019 |
| W J Sotherton Ltd | Financial services | 2019 |
| W.A. Read & Sons Limited | Manufacturing | 1979 |
| W.J. Hartnell (Builders) Ltd | Construction | 1961 |
| W.J. Hartnell Contracts Limited | Construction | 1975 |
| Wambrook Developments Limited | Construction | 2019 |
| Water's Edge Catering Chelmsford Limited | Hospitality | 2022 |
| Waterlake Properties Limited | Real estate | 1992 |
| Watkins Consulting (Essex) Ltd | Professional & scientific | 2023 |
| WE ARE Renovation Limited | Construction | 2023 |
| WE FIX Roofs Limited | Construction | 2024 |
| Wedvale Properties Limited | Real estate | 1970 |
| Wellmead Investments | Financial services | 2026 |
| Werk Developments Ltd | Construction | 2025 |
| Westbury Childcare Ltd | Health & social care | 2026 |
| Wheel Forge Management Co. Limited | Households | 2026 |
| White Dental and Cosmetic Rooms Limited | Health & social care | 2011 |
| Whites Place Properties Ltd | Real estate | 2026 |
| Whitewebs Estates LLP | | 2024 |
| Whitewebs Properties Limited | Real estate | 2014 |
| Whitson Flooring Limited | Construction | 2009 |
| Whittakers Nurseries Ltd | Construction | 2021 |
| Willarie Consulting Limited | Financial services | 2021 |
| Williams Associates (Northern) Limited | Other services | 2003 |
| Williams Tyre & Exhaust Services (Ipswich) Limited | Wholesale & retail | 2012 |
| Willowlane Limited | Real estate | 1995 |
| Wilson & Lawrence Ltd | Wholesale & retail | 2023 |
| Windsock Company Limited | Manufacturing | 2002 |
| Wine Story Limited | Wholesale & retail | 2004 |
| Winter and Bloom HR Ltd | Professional & scientific | 2026 |
| Wires & Pliers Electrical Contractors Ltd | Construction | 2022 |
| With YOU Toycessories Ltd | Manufacturing | 2026 |
| Wolf in Motion Ltd | Information & communication | 2016 |
| Wood View Management Company Limited | Households | 2026 |
| Woodhouse Lane Management Company Limited | Households | 1987 |
| WP Fire & Security Limited | Public administration | 2026 |
| Wright Finds Ltd | Wholesale & retail | 2025 |
| Writtle Forest Consultancy Ltd | Agriculture & fishing | 2015 |
| Writtle Forest Limited | Agriculture & fishing | 2006 |
| Xanari Ltd | Administrative & support | 2026 |
| XCO Group Ltd | Administrative & support | 2022 |
| XEH Foods Limited | Wholesale & retail | 2025 |
| Xifintiq Ltd | Information & communication | 2017 |
| Xvinity Consulting Limited | Information & communication | 2026 |
| YAS Property Limited | Real estate | 2016 |
| Yoga Yoga Limited | Other services | 2006 |
| YYH Services Limited | Administrative & support | 2010 |
| ZEN Building and Construction Limited | Construction | 2025 |
| ZEN Fest Ltd | Arts & recreation | 2018 |
| ZEN Networks LP | | 2022 |
| ZEN World London Ltd | Arts & recreation | 2025 |