| Welding House Limited | Administrative & support | 2015 |
| Weldpool Fabrications Ltd | Construction | 2010 |
| Welearn International Limited | Education | 2020 |
| Well Commercial Limited | Financial services | 2024 |
| Well Financial Limited | Financial services | 2022 |
| Well House Stables Ltd | Arts & recreation | 2021 |
| Wellbeing Aesthetics Essex Ltd | Health & social care | 2025 |
| Wellbeing Clinic Essex Ltd | Other services | 2024 |
| Wellesley Road Developments Ltd | Construction | 2017 |
| Wellhouse Farm (Mersea) Limited | Extraterritorial | 1964 |
| Wellies-On Community Interest Company | Education | 2015 |
| Welling Mobility Limited | Wholesale & retail | 2005 |
| Wellness Massage Limited | Other services | 2022 |
| Wells and Sons Limited | Real estate | 2022 |
| Wellspring RX Ltd | Health & social care | 2025 |
| Wenalt Starlite Limited | Professional & scientific | 2010 |
| Wentworth Design Limited | Wholesale & retail | 2000 |
| Wera Capital Partners Limited | Professional & scientific | 2019 |
| Wersco Healthcare Ltd | Health & social care | 2021 |
| West END DRY Cleaners UK Limited | Other services | 2007 |
| West END Works Limited | Manufacturing | 2016 |
| West Glen Limited | Construction | 2009 |
| West Heath Holdings Limited | Real estate | 2024 |
| West Holdings Limited | Real estate | 2002 |
| West Homes & Planning Ltd | Construction | 2026 |
| West House Property Services Ltd | Construction | 2014 |
| West Mersea Bowls Club Limited | Arts & recreation | 1967 |
| West Mersea Marine Limited | Real estate | 1988 |
| West Mersea Tennis Club Limited | Arts & recreation | 2020 |
| West Mersea Yacht Club Limited | Arts & recreation | 1935 |
| West Property Management Limited | Construction | 2015 |
| West View Investments Ltd | Real estate | 2018 |
| Western Approach Car Wash Ltd | Other services | 2023 |
| Western Contracts Ltd | Construction | 2019 |
| Western Forest Ltd | Other services | 2025 |
| Westgates Property Maintenance Ltd | Construction | 2023 |
| Westleton Property Management Company Limited | Households | 2024 |
| Westmancott Cares Ltd | Education | 2024 |
| Westminster Underlays Ltd | Wholesale & retail | 2022 |
| Westpoint RTM Company Limited | Households | 2009 |
| Westroe Limited | Construction | 2004 |
| Weststreetflats Limited | Households | 2004 |
| Westward Accountants Limited | Professional & scientific | 2008 |
| Westway Builders Ltd | Construction | 2021 |
| Westwood (Colchester) RTM Company Limited | Households | 2014 |
| Westwood Hill (Braiswick) Management Company Limited | Households | 2000 |
| Westwood Park Estates Limited | Construction | 2023 |
| Westwood Projects Holdings Limited | Financial services | 2021 |
| WET Cleaners Ltd | Administrative & support | 2014 |
| Wethersfield Takeaway Limited | Hospitality | 2026 |
| Wetton Barns Investments Limited | Real estate | 2017 |
| Wetwill Ltd | Professional & scientific | 2024 |
| WH Medi Services Ltd | Construction | 2020 |
| Wharf Brewery Limited | Manufacturing | 2023 |
| What IS Your Edition Limited | Arts & recreation | 2017 |
| What's Occurring Ltd | Health & social care | 2018 |
| Whatever Floats Your Boat Limited | Extraterritorial | 2024 |
| Wheatley Baldacchino Ltd | Households | 2021 |
| Wheatley Developments (Essex) Limited | Real estate | 2020 |
| Wheatstone Solutions Limited | Administrative & support | 2021 |
| Wheel Care Limited | Wholesale & retail | 2002 |
| Wheelworx (Bury ST Edmunds) Limited | Administrative & support | 2018 |
| Wherever WE LAY OUR Hats Ltd | Wholesale & retail | 2022 |
| Wherstead Holdings Limited | Administrative & support | 2023 |
| Whinc Limited | Information & communication | 2012 |
| Whindean Limited | Households | 1984 |
| Whip IT Like Webber Ltd | Manufacturing | 2020 |
| Whippy Bros Ltd | Wholesale & retail | 2024 |
| Whiskery Sour Ltd | Wholesale & retail | 2025 |
| Whistle Blowers Press Agency Limited | Information & communication | 1997 |
| Whistleaks Limited | Information & communication | 2022 |
| Whitbread & Bacon Brickwork Ltd | Construction | 2014 |
| White Barn Holdings Limited | Administrative & support | 2025 |
| White Barn Properties Limited | Real estate | 2013 |
| White Barns Residents Company Limited | Real estate | 2005 |
| White Crow IT Ltd | Wholesale & retail | 2018 |
| White Hart (Nayland) Limited | Extraterritorial | 1995 |
| White Hart Flowers Ltd | Wholesale & retail | 2026 |
| White Snow Cleaning Ltd | Administrative & support | 2019 |
| White Tail Films Ltd | Information & communication | 2009 |
| White's ( Walton on the Naze ) Limited | Hospitality | 2004 |
| White's of Whitehall Ltd | Manufacturing | 2017 |
| Whitegates Court Management Limited | Real estate | 2017 |
| Whitehall & Partner Limited | Arts & recreation | 2018 |
| Whitehall Car Wash Ltd | Other services | 2018 |
| Whitehall Global Holdings Limited | Financial services | 2011 |
| Whitehall Resources Group Ltd | Financial services | 2025 |
| Whitehall Resources Limited | Information & communication | 2006 |
| Whitehorn Consulting Limited | Professional & scientific | 2005 |
| Whitehouse Properties Maintenance Ltd | Real estate | 2025 |
| Whitelist Talent Ltd | Administrative & support | 2017 |
| Whiteshill Properties Limited | Real estate | 2015 |
| Whiting Auto Recycling Limited | Wholesale & retail | 2001 |
| Whitings Truck Services Limited | Wholesale & retail | 2002 |
| Whitlow Ltd | Health & social care | 2024 |
| Whitnell Contracts Limited | Construction | 1991 |
| Whitnell Limited | Extraterritorial | 2004 |
| Whittle Industry Data Holdings Limited | Financial services | 2024 |
| Whittle Industry Data Limited | Information & communication | 1994 |
| Whitton Family Holdings Limited | Other services | 2020 |