| Enageo Ltd | Manufacturing | 2019 |
| Encompass Creative Limited | Professional & scientific | 2006 |
| Endeavour Consulting (Oxford) Limited | Professional & scientific | 2016 |
| Energise Systems Limited | Construction | 2013 |
| Engage YOU Limited | Administrative & support | 2011 |
| Engineered 4 Projects Limited | Administrative & support | 2005 |
| Engineering & Construction, Nationwide Group Ltd | Construction | 2026 |
| Enigma Intelligence Ltd | Professional & scientific | 2021 |
| Enterprise Business Services & Solutions Ltd | Administrative & support | 2021 |
| Enticknap Training Co Ltd | Education | 2017 |
| Entire Building Maintenance Ltd | Construction | 2022 |
| Envision Leisure Ltd | Wholesale & retail | 2013 |
| Enzomax Secretaries Ltd | Administrative & support | 2005 |
| Epic Marketing Services Limited | Professional & scientific | 2002 |
| Epicentre Productions Limited | Manufacturing | 2009 |
| EPS Engineering & Services Ltd | Construction | 2022 |
| Equality Amplified Ltd | Other services | 2024 |
| Equipoise Earth Ltd | Professional & scientific | 2022 |
| Equovia Limited | Professional & scientific | 2022 |
| Erect Direct (UK) Limited | Construction | 2014 |
| Erect Direct Ltd | Extraterritorial | 2015 |
| ESD Estates Ltd | Real estate | 2023 |
| ESG Solutions Ltd | Information & communication | 2019 |
| ESS Group Limited | Construction | 2017 |
| Essex Air Conditioning Ltd | Construction | 2022 |
| Essex Allure Aesthetics Ltd | Wholesale & retail | 2019 |
| Essex ARB Hire Ltd | Administrative & support | 2022 |
| Essex Autogates Limited | Wholesale & retail | 2013 |
| Essex Boiler Group Limited | Construction | 2018 |
| Essex Canine Hydrotherapy Limited | Other services | 2017 |
| Essex Car and Van Sales Limited | Wholesale & retail | 2018 |
| Essex Car Fleet Ltd | Wholesale & retail | 2020 |
| Essex Care Solution Limited | Health & social care | 2018 |
| Essex Christmas Wonderland Limited | Arts & recreation | 2021 |
| Essex Coach Trips Ltd | Administrative & support | 2021 |
| Essex Concrete & Screed Limited | Construction | 2015 |
| Essex Cooling Limited | Construction | 2020 |
| Essex Driver Training Ltd | Other services | 2011 |
| Essex Driveways and Patios Ltd | Construction | 2025 |
| Essex Drylining Ltd | Construction | 2003 |
| Essex Education Consultancy Services Limited | Administrative & support | 2022 |
| Essex Fashion Week Limited | Arts & recreation | 2011 |
| Essex GAS Services Limited | Administrative & support | 2004 |
| Essex Groundwork Supplies Limited | Wholesale & retail | 2000 |
| Essex Heating & Plumbing Limited | Construction | 2013 |
| Essex Hiab & Haulage Ltd | Transport & logistics | 2025 |
| Essex JIU Jitsu Open Ltd | Arts & recreation | 2021 |
| Essex Luxury Dog Boarding Ltd | Other services | 2025 |
| Essex Mastic Ltd | Construction | 2022 |
| Essex Metalworx Ltd | Manufacturing | 2017 |
| Essex Mini Piling Limited | Construction | 2006 |
| Essex Mustang Services Limited | Wholesale & retail | 2017 |
| Essex Podiatry Ltd | Health & social care | 2019 |
| Essex Precision Soda Blasting Ltd | Administrative & support | 2019 |
| Essex Pressure Washing UK Ltd | Administrative & support | 2024 |
| Essex Property Rentals Ltd | Households | 2025 |
| Essex Protect Electrical Limited | Construction | 2023 |
| Essex Provincial Grand Lodge (Building Fund) Limited | Other services | 1971 |
| Essex Roof Cleaning UK Ltd | Administrative & support | 2026 |
| Essex Scale Services Ltd | Wholesale & retail | 2003 |
| Essex Stainless Fabrication Ltd | Construction | 2019 |
| Essex Telecom Installations Limited | Information & communication | 1997 |
| Essex Telecoms Ltd | Information & communication | 2018 |
| Essex Telephone Systems Ltd | Information & communication | 2023 |
| Essex Transport Services Ltd | Transport & logistics | 2016 |
| Essex Vinyl Wrapping Ltd | Construction | 2021 |
| Essex Wheel Refurbs Ltd | Construction | 2020 |
| Essex Wheels and Tyres Limited | Wholesale & retail | 2024 |
| Essex Wills & Trusts Ltd | Professional & scientific | 2014 |
| Essexventures Ltd | Other services | 2025 |
| Estate Planning Key Dials Limited | Information & communication | 2025 |
| ESX Cladding & Roofing Ltd | Construction | 2025 |
| Eternal Canvas Limited | Professional & scientific | 2025 |
| ETS Networks Limited | Information & communication | 2018 |
| Eurontime Limited | Transport & logistics | 2016 |
| European Refrigeration Limited | Professional & scientific | 2005 |
| Eurotec FM Ltd | Professional & scientific | 2013 |
| Eurotec FM Service Ltd | Professional & scientific | 2022 |
| Everest Aluminium Systems Limited | Manufacturing | 2025 |
| Evolve Fitness Essex Ltd | Arts & recreation | 2025 |
| Evolving Excellence Ltd | Education | 2026 |
| Evrepower Ltd | Professional & scientific | 2026 |
| EWD Group Limited | Administrative & support | 2020 |
| Ewgc Ltd | Construction | 2022 |
| Exclusive Contracts Limited | Construction | 2009 |
| Exclusive Nails Essex Ltd | Other services | 2017 |
| Exordia Global Ltd | Wholesale & retail | 2019 |
| Exotic Boerboels UK Limited | Agriculture & fishing | 2021 |
| Expert Cleaning Company Limited | Administrative & support | 2016 |
| Extrospect Properties Ltd | Real estate | 2013 |
| Eyes Front Entertainment LLP | | 2023 |
| EZ2OWN Ltd | Construction | 2013 |
| F Brown Courier Ltd | Transport & logistics | 2018 |
| F C Gardner & Co Ltd | Extraterritorial | 2012 |
| F Hounsom Limited | Other services | 2025 |
| F.E. Good Properties Limited | Real estate | 1990 |
| F1RST Construction Ltd | Construction | 2021 |
| F5 Business Solutions Limited | Education | 2015 |
| F9 CC Limited | Real estate | 2024 |
| F9 Socials Ltd | Professional & scientific | 2026 |