| Wood Street Block D Management Company Limited | Households | 1988 |
| Wood Veneers Limited | Wholesale & retail | 2020 |
| Woodbanks (Takeley) RMC Limited | Households | 2022 |
| Woodcote Grove Estate Limited | Construction | 1904 |
| Woodfield Capital Limited | Professional & scientific | 2016 |
| Woodgates Commercial Limited | Real estate | 2018 |
| Woodhall Express Ltd | Wholesale & retail | 2021 |
| Woodhall Properties (Cheshunt) Limited | Extraterritorial | 2012 |
| Woodhall Properties (London) Limited | Extraterritorial | 1993 |
| Woodhall Properties Limited | Professional & scientific | 1989 |
| Woodham Consulting Limited | Construction | 2010 |
| Woodham Fish Bar Limited | Hospitality | 2025 |
| Woodham Kebab Limited | Hospitality | 2021 |
| Woodham Radars F.C. Limited | Arts & recreation | 2009 |
| Woodham Taxi Ltd | Transport & logistics | 2026 |
| Woodham Tyre Ltd | Wholesale & retail | 2026 |
| Woodhouse National Cooling Ltd | Construction | 2026 |
| Woodhouse Space Ltd | Real estate | 2025 |
| Woodland Way Management Co. Ltd. | Extraterritorial | 2013 |
| Woodrooffe Estate Co. Limited | Households | 1983 |
| Woods Croft Limited | Real estate | 2024 |
| Woodstock Enterprises Limited | | 1986 |
| Woodward's and Sons Ltd | Administrative & support | 2022 |
| Woodways Construction Ltd | Construction | 2016 |
| Woodways Homes Limited | Real estate | 2013 |
| Woolmount Antiques Ltd | Wholesale & retail | 2026 |
| Woolpack Chelmsford 2022 Ltd | Hospitality | 2022 |
| Work Friends Ltd | Real estate | 2019 |
| Work Wear 4 U Limited | Manufacturing | 2022 |
| Work Wings Ltd | Information & communication | 2025 |
| Workflow Logic Limited | Information & communication | 2025 |
| Workforce Greater London Ltd | Real estate | 2021 |
| Workgroup Limited | Transport & logistics | 2019 |
| Working With Will Ltd | Information & communication | 2023 |
| Workout Online International Ltd | Administrative & support | 2020 |
| Works of Hart Limited | Manufacturing | 2016 |
| World Food Restaurant Limited | Wholesale & retail | 2021 |
| World Mapper Travel Limited | Administrative & support | 2026 |
| World of PPE Ltd | Manufacturing | 2020 |
| Wormex Ltd | Wholesale & retail | 2025 |
| Worth Property Management Limited | Households | 2024 |
| Wosu Property Limited | Real estate | 2021 |
| Wovan Limited | Real estate | 2024 |
| WOW Inspirational Business Limited | Health & social care | 2011 |
| WP Investment Management Ltd | Financial services | 2018 |
| Wrapid Graphics Ltd | Manufacturing | 2022 |
| Wray-Tech Holdings Ltd | Financial services | 2023 |
| Wray-Tech Supplies Ltd | Wholesale & retail | 2018 |
| Wrenbury Care Services Ltd | Health & social care | 2026 |
| Wrenwray Limited | Construction | 2004 |
| Wright Aviation and Training Limited | Transport & logistics | 2022 |
| Wright Kerr Tyson Limited | Professional & scientific | 2014 |
| Wright Lights Electrical Ltd | Information & communication | 2024 |
| Wrights Holdings Limited | Financial services | 2020 |
| Write for YOU Limited | Wholesale & retail | 2010 |
| Writtle College Limited | Education | 2023 |
| Writtle Cricket Centre Ltd | Arts & recreation | 2017 |
| Writtle Fish Shop ATT Ltd | Hospitality | 2025 |
| Writtle HAY and Straw Ltd | Hospitality | 2014 |
| Writtle Home Improvements Limited | Construction | 2016 |
| Writtle Picture House Management Limited | Households | 2014 |
| Writtle Priory Limited | Households | 1985 |
| Writtle Tennis Academy Ltd | Arts & recreation | 2021 |
| Wroxham Angling Limited | Wholesale & retail | 2001 |
| WS Electical Ltd | Construction | 2026 |
| WS Fleet Limited | Manufacturing | 2018 |
| WSC Electrical & Commissioning Ltd | Construction | 2023 |
| Wspace Ltd | Administrative & support | 2019 |
| WSS Creative Ltd | Information & communication | 2013 |
| Wtaf Limited | Administrative & support | 2026 |
| WTS Freight Ltd | Transport & logistics | 2020 |
| Wurban Ltd | Construction | 2019 |
| WVD Electrical and Commissioning Ltd | Professional & scientific | 2018 |
| Wwcc Limited | Agriculture & fishing | 2000 |
| Wwcd Broadcast Ltd | Construction | 2021 |
| Wyck Properties Limited | Financial services | 2018 |
| Wylde Enterprises Limited | Extraterritorial | 2001 |
| Wylde Events Ltd | Extraterritorial | 2001 |
| Wylde Hire Limited | Extraterritorial | 2001 |
| Wylde Industries Limited | Extraterritorial | 2002 |
| Wylde Investments Limited | Extraterritorial | 2001 |
| Wylde Manpower Limited | Extraterritorial | 2000 |
| Wylde Partnership Ltd | Extraterritorial | 2001 |
| Wylde Waves Limited | Administrative & support | 1998 |
| Wyldeco Ltd | Extraterritorial | 1998 |
| Wyvern Properties Limited | Real estate | 1959 |
| X Property Services Ltd | Construction | 2026 |
| X10 Software Limited | Manufacturing | 2021 |
| X2000 Limited | Administrative & support | 2000 |
| X25 Holdings Ltd | Real estate | 2025 |
| XB2 Limited | Manufacturing | 2019 |
| XBP Refining Consultants Ltd | Professional & scientific | 2015 |
| Xcel Tutoring Limited | Education | 2024 |
| Xcelerate Motors Ltd | Wholesale & retail | 2020 |
| Xcelsior Ltd | Administrative & support | 2017 |
| Xelaro Limited | Extraterritorial | 2012 |
| Xeleta Pharma Limited | Construction | 2022 |
| Xeneos Consulting Limited | Information & communication | 2021 |
| Xenergie Digital Limited | Professional & scientific | 2021 |
| Xenergie Holding Limited | Professional & scientific | 2021 |