| Essex TAP Group Limited | Arts & recreation | 2019 |
| Essex Teddy Hospital Ltd | Manufacturing | 2024 |
| Essex Tints Limited | Wholesale & retail | 2013 |
| Essex Trucks Ltd | Transport & logistics | 2014 |
| Essex Valve Engineering Services Limited | Construction | 1983 |
| Essex Wayfarer Ltd | Hospitality | 2025 |
| Essex Woodland Fencing Ltd | Administrative & support | 2024 |
| EST Decor Limited | Construction | 2015 |
| Estates Compliance Online Limited | Professional & scientific | 2025 |
| Estuary Consultancy Ltd | Professional & scientific | 2025 |
| Estuary Consulting Limited | Education | 2025 |
| Estuary Contracts Limited | Construction | 2019 |
| Estuary Creative Limited | Arts & recreation | 2006 |
| Estuary Financial Services Limited | Financial services | 2016 |
| Estuary Holdings Limited | Real estate | 2016 |
| Estuary Joinery Ltd | Manufacturing | 2024 |
| Estuary Kitchens Limited | Construction | 2025 |
| Estuary Living Ltd | Real estate | 2016 |
| Estuary Plumbing and Heating Ltd | Construction | 2018 |
| Estuary Quantity Surveying Ltd | Construction | 2015 |
| Estuary Roofing Ltd | Construction | 2023 |
| Estuary Ventures Limited | Wholesale & retail | 2025 |
| Estuary Waste Management Limited | Transport & logistics | 2012 |
| Estuary Wealth Management Limited | Financial services | 2018 |
| Etec Electrical Essex Limited | Construction | 2026 |
| ETH Trustee Limited | Financial services | 2024 |
| Euphoria Textiles Home Limited | Professional & scientific | 2023 |
| Eureka Office Supplies Ltd | Administrative & support | 2005 |
| Eurolab Services LLP | | 2009 |
| Evans Ferri Limited | Information & communication | 1998 |
| Event Vending Staff Limited | Administrative & support | 2016 |
| Eventcode Ltd | Administrative & support | 2009 |
| Everark Weldtronics Limited | Manufacturing | 2000 |
| Evergreen Air Conditioning Ltd | Construction | 2010 |
| Everlast Decking Solutions Ltd | Construction | 2011 |
| EVO360 Ltd | Construction | 2025 |
| Evolawless Ltd | Wholesale & retail | 2025 |
| Evolution Decorating Services Limited | Construction | 2014 |
| Evolution Roofing & Construction Ltd | Construction | 2015 |
| Evolve Heating - Essex Limited | Construction | 2026 |
| Evolved Services Ltd | Professional & scientific | 2023 |
| Evolved Ventures Ltd | Financial services | 2023 |
| Evolvehosts Property Management Ltd | Wholesale & retail | 2021 |
| Evolving Lives Consultancy Limited | Health & social care | 2024 |
| Evospeed - South Ltd | Transport & logistics | 2023 |
| Evospeed East Ltd | Transport & logistics | 2023 |
| Evospeed Limited | Transport & logistics | 2016 |
| Evospeed Tyres Ltd | Wholesale & retail | 2025 |
| Ewelyntanroxanne Limited | Hospitality | 2016 |
| Ewers Construction Limited | Construction | 2025 |
| EWM Transport Limited | Transport & logistics | 2019 |
| Exact MIX Concrete Limited | Manufacturing | 2020 |
| Exarlis Ltd | Professional & scientific | 2026 |
| Excel Haulage Solutions Limited | Transport & logistics | 2013 |
| Excel Legal Costs Limited | Professional & scientific | 2014 |
| Excelsior Consultants Ltd | Professional & scientific | 2013 |
| Exceptional Carers Ltd | Health & social care | 2023 |
| Executive Airport Transfer Services Ltd | Transport & logistics | 2025 |
| Executive Cars Essex Ltd | Administrative & support | 2024 |
| Executive Electrical Ltd | Construction | 2017 |
| Exel Contracts Limited | Construction | 1991 |
| Exeligo Limited | Administrative & support | 2018 |
| Express Anchor Ltd | Transport & logistics | 2025 |
| Express Connexions Limited | Transport & logistics | 2014 |
| Exprotec Ltd | Information & communication | 2025 |
| Exquisite Deli Ltd | Wholesale & retail | 2011 |
| Extreme Works G.B. Limited | Information & communication | 2004 |
| Ezee Park Ltd | Administrative & support | 2023 |
| F & L Supplies Ltd | Wholesale & retail | 2018 |
| F J Taylor Properties Ltd | Real estate | 2022 |
| F M F Properties Limited | Hospitality | 2002 |
| F Weller Limited | Financial services | 2021 |
| F&F Property Group Ltd | Real estate | 2025 |
| F&L Enterprises Limited | Real estate | 2021 |
| Fabric Source Limited | Wholesale & retail | 2009 |
| Facial Harmony Ltd | Wholesale & retail | 2024 |
| Fairfield Contract Limited | Construction | 2021 |
| Fairlight Vehicles Limited | Other services | 2003 |
| Fairview Autos Limited | Wholesale & retail | 2009 |
| Fairway Couriers Ltd | Transport & logistics | 2025 |
| Falchion Limited | Financial services | 2021 |
| Falco Kingsbridge Limited | Administrative & support | 2021 |
| Falcon Roofing and Linings Ltd | Construction | 2025 |
| Fallows Print Limited | Manufacturing | 1965 |
| Family Lawyers (LOS) Ltd | Professional & scientific | 2025 |
| Family Works Fostering Limited | Health & social care | 2015 |
| Farenden Aviation Services Limited | Transport & logistics | 2003 |
| Farilya Essex Limited | Hospitality | 2022 |
| Farleyend Limited | Other services | 1976 |
| Farm & Country Supplies Limited | Administrative & support | 2007 |
| Farndale Precision Engineering Limited | Manufacturing | 2002 |
| Farpetal Limited | Administrative & support | 2021 |
| Farrah Fire Limited | Public administration | 2015 |
| Farran Music Limited | Information & communication | 2015 |
| FASH1 London Limited | Education | 2022 |
| Fastnet Telecom Limited | Information & communication | 2015 |
| Fastrate Services Limited | Administrative & support | 2021 |
| Fasttack Ltd | Information & communication | 2012 |
| Fathom Watches Limited | Wholesale & retail | 2022 |
| Favell Consulting Limited | Financial services | 2009 |