| Walkerpower&Safety Ltd | Construction | 2025 |
| Wall to Wall Contractors Ltd | Construction | 2011 |
| Wallace Brothers Limited | Construction | 2020 |
| Waller Transportation Ltd | Transport & logistics | 2020 |
| Waller.Ac Ltd | Professional & scientific | 2026 |
| Wallerstrom Accountancy and Taxation Services Limited | Professional & scientific | 2002 |
| Wallerstrom Business Solutions Limited | Professional & scientific | 2023 |
| Wallnut Tree Properties Ltd | Real estate | 2025 |
| Wallsh Street Holdings Ltd | Financial services | 2022 |
| Walmer (Adamson) Motors Limited | Wholesale & retail | 1975 |
| Walnuts South Limited | Real estate | 2026 |
| Walsh Family Office | Professional & scientific | 2025 |
| Waltham Children's Services Limited | Health & social care | 2024 |
| Waltham Hall Properties Limited | Real estate | 2017 |
| Waltham Holdings Limited | Financial services | 2024 |
| Waltham MOT & Service Centre Ltd | Wholesale & retail | 2021 |
| Waltham Property Services Limited | Real estate | 2024 |
| Walthamites LLP | | 2022 |
| Walthamstow Community Central Limited | Real estate | 2020 |
| Wampra Estates Ltd | Real estate | 2023 |
| Wandersmart Limited | Administrative & support | 2019 |
| Want That Hair Ltd | Administrative & support | 2020 |
| Wanted - Cleaning Company Ltd | Administrative & support | 2017 |
| Ward J M Ltd | Information & communication | 2026 |
| Ward Moretti Limited | Wholesale & retail | 2022 |
| Wardens Hall Estate Management Company Limited | Administrative & support | 2016 |
| Wares Farm Limited | Other services | 1956 |
| Wari Consultancy Limited | Health & social care | 2019 |
| Waris Construction Ltd | Construction | 2025 |
| Warm Home Essex Limited | Construction | 2022 |
| Warner Cole Ltd | Arts & recreation | 2025 |
| Warners Farms Limited | Agriculture & fishing | 1963 |
| Warren Farm Limited | Agriculture & fishing | 1951 |
| Warren Farm Trading Partnership LLP | | 2012 |
| Warrens Groundworks Limited | Construction | 2022 |
| Warwick Group Limited | Construction | 1997 |
| Warwick Interiors Ltd. | Construction | 2017 |
| Wasi HUT Limited | Wholesale & retail | 2022 |
| Watch & Repair Limited | Other services | 2026 |
| Watch Specialists Ltd | Wholesale & retail | 2000 |
| Watch Tower Bible and Tract Society of Britain | Construction | 1999 |
| Watchdaddy Ltd | Wholesale & retail | 2026 |
| Watchgrowth Limited | Professional & scientific | 1988 |
| Watchkeeper Security & Property Management Services Limited | Administrative & support | 2011 |
| Watchmist Property Limited | Real estate | 2018 |
| Water Companies(Pension Fund)Trustee Company(The) | Professional & scientific | 1974 |
| Water Corn Mill (West Burton) Limited(The) | Households | 1986 |
| Water Resources Limited | Professional & scientific | 2001 |
| Waterfront and City (Essex) Limited | Construction | 2006 |
| Waterhouse Business Park Management Limited | Real estate | 2007 |
| Waterloo Lane Management Company Limited | Households | 2006 |
| Waterside Alliance Limited | Hospitality | 2021 |
| Waterside Home Care Limited | Health & social care | 2020 |
| Waterside Interiors Limited | Construction | 2025 |
| Watson Legal Limited | Professional & scientific | 2017 |
| Watson Rowland Accountants Ltd | Professional & scientific | 2018 |
| Watt White Properties Limited | Construction | 2017 |
| Watts Business Solutions Limited | Administrative & support | 2024 |
| Watts PER Kilo Limited | Administrative & support | 2022 |
| Wave Bridge Court RTM Company Limited | Households | 2024 |
| Wave Communications Limited | Information & communication | 1994 |
| Wavedata Limited | Information & communication | 2000 |
| Waverley Limited | Real estate | 2015 |
| WAX & Shine Car Wash and Vehicle Servicing Ltd | Wholesale & retail | 2024 |
| WAX Natural Candle Company Limited | Manufacturing | 2020 |
| WB Marchant Limited | Information & communication | 2022 |
| WBA Systems Ltd | Professional & scientific | 2012 |
| WBF Decs Limited | Construction | 2011 |
| WC Access Ltd | Financial services | 2025 |
| WCC Property Management Limited | Real estate | 2024 |
| WCC Recruitment Ltd | Administrative & support | 2026 |
| WD Electrical Contractors Limited | Construction | 2021 |
| Wdea Limited | Real estate | 2017 |
| WDS Transport Solutions Ltd | Transport & logistics | 2023 |
| WE ARE Essex Cricket Limited | Arts & recreation | 2024 |
| WE ARE Loved Limited | Health & social care | 2012 |
| WE ARE Redefined C.I.C. | Other services | 2024 |
| WE Buy Prestige Car Ltd | Wholesale & retail | 2016 |
| WE DO That Ltd | Construction | 2021 |
| WE Fit Solar UK Ltd | Construction | 2024 |
| WE Innovate Sign Solutions Ltd | Professional & scientific | 2019 |
| WE Link Transfers Ltd | Transport & logistics | 2026 |
| WE Make Things Personal Ltd | Manufacturing | 2024 |
| WE Pump Concrete Limited | Manufacturing | 2021 |
| Wealth and Safety (London) Limited | Administrative & support | 2011 |
| Wearisma Ltd. | Information & communication | 2014 |
| Weavemeadream Limited | Manufacturing | 2020 |
| Weavers Court Harwich Limited | Real estate | 2009 |
| Weaving Web 3 Limited | Information & communication | 2026 |
| Web Impact Ltd | Information & communication | 2012 |
| Web IT 4U Limited | Information & communication | 2000 |
| Web Wonderland Ltd | Information & communication | 2021 |
| Webb Construction Services Ltd | Construction | 2020 |
| Webb Weddings Limited | Professional & scientific | 2009 |
| Webbco Limited | Other services | 2003 |
| Webpurchase Limited | Information & communication | 1997 |
| Webranges Technology Solutions Limited | Information & communication | 2014 |
| Websolut Pro SG Limited | Real estate | 2025 |
| Webuyanybike Limited | Professional & scientific | 2009 |
| Webwax Ltd | Information & communication | 2012 |