| Wicks Place Development Limited | Construction | 2020 |
| Wickwater Digital Hearing Aids Limited | Health & social care | 2015 |
| Widdershins Limited | Professional & scientific | 2019 |
| Widford Lodge School Limited | Education | 1996 |
| Wight Financial Limited | Professional & scientific | 2015 |
| Wigworm Productions Limited | Information & communication | 2009 |
| Wiki-Ed Limited | Education | 2015 |
| Wilcox Property LLP | | 2007 |
| Wild and Beyond Adventures Ltd | Extraterritorial | 2026 |
| Wild and Rooted Farming Ltd | Wholesale & retail | 2021 |
| Wild for Purpose Ltd | Information & communication | 2020 |
| Wild Hearted Adventures Ltd | Extraterritorial | 2026 |
| Wild Things Pest Solutions Limited | Administrative & support | 2005 |
| Wilder Botanicals Limited | Manufacturing | 2019 |
| Wilderness Foundation UK | Education | 2006 |
| Wildwood Services Ltd | Administrative & support | 2022 |
| Wilkin Consultants Limited | Professional & scientific | 2011 |
| Wilkinsons Holdings Limited | Financial services | 2023 |
| Will Charter Limited | Administrative & support | 2004 |
| Will-Crest Rehabilitation Services Ltd | Health & social care | 2021 |
| William Leggett Consulting Limited | Information & communication | 2011 |
| William Lickorish Consulting Limited | Professional & scientific | 2012 |
| William Thompson Homes (Epping) Ltd | Construction | 2024 |
| William Thompson Homes (Theydon Meadows) Ltd | Construction | 2020 |
| Williams Surfacing Ltd | Construction | 2024 |
| Williams Thinks Limited | Professional & scientific | 2022 |
| Willican (MIH) Limited | Professional & scientific | 2020 |
| Willmez Limited | Health & social care | 2018 |
| Willow Court (Sawbridgeworth) Management Company Limited | Households | 2006 |
| Willow Flooring Services Ltd | Construction | 2019 |
| Willow Mews (Chelmsford) Management Company Limited | Households | 2001 |
| Willow Properties (Chelmsford) Limited | Real estate | 1960 |
| Willow Services Ltd | Construction | 2016 |
| Willsher and SON Ltd | Construction | 2021 |
| Wilmont Consulting Ltd | Professional & scientific | 2026 |
| Wilson & Co Legal LLP | | 2015 |
| Wilson Construction Limited | Construction | 1989 |
| Wilson Plant Limited | Administrative & support | 1992 |
| Wilson Roofing Contractors Ltd | Construction | 2022 |
| Wilson Solutions & Services Limited | Administrative & support | 2017 |
| Wilson's Care Limited | Health & social care | 2019 |
| Wilsons Pads Limited | Real estate | 2023 |
| Wilstok International Shipping Limited | Transport & logistics | 2003 |
| Wiltshire Architectural Limited | Professional & scientific | 2007 |
| Wimsey Orthopaedics Ltd | Health & social care | 2007 |
| Wimsey Properties Ltd | Hospitality | 2024 |
| WIN With CX Ltd | Information & communication | 2026 |
| Wind Events and Organisation Consultancy Ltd | Transport & logistics | 2020 |
| Window Cleaner Essex Ltd | Administrative & support | 2024 |
| Window Contracts Ltd | Construction | 2021 |
| Window Projects Ltd. | Construction | 2017 |
| Windson Analyticsx Ltd | Information & communication | 2025 |
| Windson Holdings Ltd | Financial services | 2025 |
| Windson Properties Limited | Real estate | 2020 |
| Windsor Dental Ltd | Health & social care | 2020 |
| Windswept International Limited | Administrative & support | 2007 |
| Windy Duck Limited | Wholesale & retail | 2024 |
| Wine and Cheese EN Ltd | Real estate | 2026 |
| Wine Smile Limited | Professional & scientific | 2012 |
| Wine&Kitchen Limited | Hospitality | 2015 |
| Wingvestments Limited | Real estate | 2021 |
| Winks Grooming Ltd | Agriculture & fishing | 2024 |
| Winnar Properties Ltd | Real estate | 2022 |
| Winnie & Freddy (UK) Ltd | Wholesale & retail | 2019 |
| Winsortan Limited | Agriculture & fishing | 2024 |
| Winstar Technologies Ltd | Professional & scientific | 2025 |
| Wintex Supplies Limited | Wholesale & retail | 2024 |
| Wisdom Design Limited | Professional & scientific | 2003 |
| Wisdom Leasing Ltd | Administrative & support | 2009 |
| Wise Cleaning Pro Ltd | Administrative & support | 2026 |
| Wise Monkey Events Limited | Administrative & support | 2017 |
| With Jasper Ltd | Information & communication | 2026 |
| Witham MOT Centre Ltd | Wholesale & retail | 2025 |
| Witham Motor Company Ltd | Wholesale & retail | 2011 |
| Witham Outdoor Catering Limited | Hospitality | 2022 |
| Witness the Fitness Limited | Arts & recreation | 2013 |
| Witney Travel Bureau Limited | Real estate | 1964 |
| WJD Contracts Ltd | Hospitality | 2020 |
| WJP Consulting Limited | Professional & scientific | 2011 |
| WJW Tattoo Ltd | Other services | 2023 |
| WK Salvage Ltd | Wholesale & retail | 2019 |
| WM Developments Holdings Limited | Financial services | 2024 |
| WM IFA Limited | Financial services | 2015 |
| WN Energy Group Limited | Construction | 2026 |
| Woburn Court Residents Association Limited | Households | 1990 |
| Wofte Clothing Limited | Wholesale & retail | 2012 |
| WOK Chelmsford Limited | Hospitality | 2024 |
| WOK Inn Chelmsford Limited | Hospitality | 2016 |
| Woknroll Vibes Ltd | Hospitality | 2024 |
| Wolds END Trade Limited | Wholesale & retail | 2026 |
| Wolexxo Services Limited | Health & social care | 2019 |
| Wolf Tech Apps Ltd | Information & communication | 2023 |
| Wolfe Property Consultants Limited | Real estate | 2024 |
| Wolves Transport Ltd | Transport & logistics | 2025 |
| Woman at the Well Ministries | Other services | 2016 |
| Women in Events Retreats LLP | | 2025 |
| Women Wellbeing Hub | Health & social care | 2025 |
| Wonderland Entertainment Group Ltd | Administrative & support | 2017 |
| Wonky Lemon Ltd | Professional & scientific | 2021 |
| Wood Automotive Limited | Manufacturing | 2014 |