| Ensmart ESS Ltd | Professional & scientific | 2023 |
| Ensmart Power Ltd | Manufacturing | 2019 |
| Enventic Limited | Manufacturing | 2003 |
| Enviro-Safe 28 UK Ltd | Administrative & support | 2020 |
| Enviro-Therm Insulation Ltd | Construction | 2016 |
| Environmental Water Care Inc Limited | Wholesale & retail | 2003 |
| EO Consulting Ltd | Information & communication | 2015 |
| EP Garston Limited | Professional & scientific | 2022 |
| EPA Design Limited | Professional & scientific | 2003 |
| Epic London Pipe Services Ltd | Construction | 2024 |
| Epic Loot Gaming Limited | Wholesale & retail | 2025 |
| Epic Pipework Installation Co Ltd | Construction | 2011 |
| Epic Project Holdings Co Ltd | Financial services | 2011 |
| Eprox Capital Ltd | Wholesale & retail | 2023 |
| Equinties Limited | Arts & recreation | 2022 |
| Equity Rentals Limited | Real estate | 2016 |
| Erbon Ventures Ltd | Professional & scientific | 2023 |
| Eric M. Taylor (Properties) Limited | Construction | 1963 |
| ERO Holdco Ltd | Financial services | 2026 |
| Erptech.Investments Ltd | Financial services | 2025 |
| ERX Management Limited | Real estate | 2017 |
| Esmart Networks Limited | Construction | 2016 |
| Espana Foods Ltd | Wholesale & retail | 2024 |
| Essence of Aesthetics Ltd | Other services | 2018 |
| Essex and London Waste Services Ltd | Water & waste | 2026 |
| Essex Auto Care Limited | Wholesale & retail | 2007 |
| Essex Bikers Centre Ltd | Wholesale & retail | 2013 |
| Essex Ceilings Limited | Construction | 2018 |
| Essex Comps Limited | Arts & recreation | 2024 |
| Essex County Parking Limited | Real estate | 2010 |
| Essex Dementia Care | Health & social care | 2009 |
| Essex Drainage Solutions Ltd | Construction | 2021 |
| Essex Electrical Limited | Construction | 2024 |
| Essex Electrical Training Limited | Education | 2022 |
| Essex Engine Services Ltd | Wholesale & retail | 2024 |
| Essex Fenster Ltd | Manufacturing | 2024 |
| Essex Fire Shutters Ltd | Construction | 2022 |
| Essex Flat Roofing Specialists Limited | Construction | 2017 |
| Essex Girl Productions Ltd | Arts & recreation | 2019 |
| Essex Gymkhana Club Ltd | Hospitality | 2020 |
| Essex JET Wash Services Ltd | Administrative & support | 2021 |
| Essex Mortgage Centre Limited | Financial services | 2006 |
| Essex Orthopaedics (Braintree) Limited | Manufacturing | 2014 |
| Essex Paws and Chores Ltd. | Other services | 2017 |
| Essex Plumbing & Bathrooms Ltd | Wholesale & retail | 2013 |
| Essex Radio Hire Limited | Administrative & support | 2023 |
| Essex Reptile Ltd. | Wholesale & retail | 2011 |
| Essex Security Training Ltd | Administrative & support | 2024 |
| Essex Sporting Co Ltd | Wholesale & retail | 2025 |
| Essex Taxi Limited | Transport & logistics | 2025 |
| Essex Towbars Ltd | Professional & scientific | 2009 |
| Essex Trade Frames Ltd | Construction | 2020 |
| Essex Wheel & Body Works Ltd | Wholesale & retail | 2022 |
| Essex X-Ray and Medical Equipment Limited | Manufacturing | 1991 |
| Estates Solutions Ltd | Extraterritorial | 2025 |
| ETA Group Services Ltd | Administrative & support | 2026 |
| Ethem Mobile Hairdresser Limited | Other services | 2020 |
| ETI Training Ltd | Administrative & support | 2015 |
| ETO Solutions Ltd | Administrative & support | 2018 |
| Euinfopages.Com Ltd | Administrative & support | 2011 |
| Euromotofan Ltd | Wholesale & retail | 2012 |
| Eurospares (Continental Parts) Limited | Wholesale & retail | 1985 |
| Eurospares Trustee Limited | Extraterritorial | 2025 |
| Eurotech Powder Coating Services Ltd | Construction | 2012 |
| Eusam Care Ltd | Health & social care | 2025 |
| EV Connect Ltd | Extraterritorial | 2015 |
| EV Electrix Ltd | Construction | 2023 |
| Evans Kivotos Limited | Professional & scientific | 2017 |
| Evconnectors Limited | Wholesale & retail | 2012 |
| EVE and Lois Limited | Other services | 2019 |
| Event Sound & Light Holdings Limited | Financial services | 2025 |
| Event Sound & Light Limited | Administrative & support | 2003 |
| Events Number One Ltd | Health & social care | 2022 |
| Ever Electrical Ltd | Construction | 2024 |
| Everard Bloodstock Limited | Agriculture & fishing | 2021 |
| Everlasting Youth Limited | Manufacturing | 1995 |
| Evglo Consulting Ltd | Professional & scientific | 2022 |
| Evlyn Ltd | Manufacturing | 2024 |
| Evolution Facades Ltd | Construction | 2015 |
| Evolution Human Capital Ltd | Administrative & support | 2024 |
| Evolve BA Ltd | Information & communication | 2019 |
| Evozone Ltd | Wholesale & retail | 2020 |
| Ewik Ltd | Manufacturing | 2018 |
| EWS Outsourcing Limited | Administrative & support | 2020 |
| Excel Duct Cleaning Limited | Administrative & support | 2015 |
| Excel Graphics UK Limited | Manufacturing | 2002 |
| Excellent Connections Limited | Transport & logistics | 1996 |
| Excellor Academy Ltd | Education | 2019 |
| Executive Cabs 24/7 Ltd | Transport & logistics | 2024 |
| Exeter Accident Repair Centre Limited | Wholesale & retail | 2024 |
| Exhibit a Events Limited | Administrative & support | 2020 |
| Exitt Ltd | Other services | 2018 |
| Expert Property Inspections Limited | Professional & scientific | 2013 |
| Expres Taxi Ltd | Transport & logistics | 2025 |
| Express Flooring Ltd | Wholesale & retail | 2017 |
| Extendability Ltd | Construction | 2025 |
| Extending Designs Limited | Professional & scientific | 2017 |
| F. H. Nash Holdings Limited | Financial services | 2025 |
| F.H. Nash Limited | Manufacturing | 1964 |
| F.O.Watts & Sons Limited | Transport & logistics | 1970 |