| Equip Restauration Ltd | Construction | 2017 |
| Equisoft Consultancy Ltd | Information & communication | 2008 |
| Equity Management Corporation (UK) Limited | Professional & scientific | 2017 |
| Equity Millionaire Ltd | Administrative & support | 2019 |
| ERC Services Limited | Construction | 2020 |
| Ergan Limited | Hospitality | 2025 |
| Ericon Developments Ltd | Construction | 2012 |
| Erik Management Ltd | Financial services | 2014 |
| Erin Estates Limited | Real estate | 2014 |
| Erith Hills LLP | | 2016 |
| Ernest Hammond (London) Limited | Wholesale & retail | 1942 |
| ERNIE9184 Ltd | Construction | 2006 |
| Eroc UK Ltd | Wholesale & retail | 2015 |
| Errison Tawco Consultancy Limited | Education | 1998 |
| Erudite Spring Consult Ltd | Health & social care | 2026 |
| ES Civil Engineering Ltd | Construction | 2023 |
| ES Freehold Limited | Real estate | 2017 |
| Esap Holdings Ltd | Financial services | 2022 |
| Esap MED Referrals Ltd | Health & social care | 2022 |
| Esap Properties Ltd | Real estate | 2022 |
| Escada Limited | Construction | 2007 |
| ESG Data Centres Limited | Financial services | 2021 |
| Esmart Business Services Ltd | Information & communication | 2010 |
| Esmeg Limited | Financial services | 2023 |
| ESP Art Ltd | Arts & recreation | 2015 |
| Espinel Limited | Information & communication | 2014 |
| Espressolution Ltd | Manufacturing | 2013 |
| Essante Design Ltd | Professional & scientific | 1990 |
| Essential Adaptations Ltd | Construction | 2020 |
| Essential Business Ltd | Professional & scientific | 2025 |
| Essential Digital Skills Limited | Education | 2022 |
| Essential Film and Television Productions Limited | Arts & recreation | 1983 |
| Essential Renovations Ltd | Construction | 2022 |
| Essential Vibration Services Limited | Health & social care | 2022 |
| Essex & Anglia Preservation Limited | Construction | 2000 |
| Essex 8 Seater Cars Limited | Transport & logistics | 2022 |
| Essex Afro Mart Ltd | Wholesale & retail | 2026 |
| Essex Agricultural Society | Other services | 1992 |
| Essex Air Contracts Limited | Construction | 2026 |
| Essex ALL Moves Ltd | Transport & logistics | 2024 |
| Essex Alloys Ltd | Wholesale & retail | 2025 |
| Essex Alms Housing Limited | Construction | 2023 |
| Essex and Suffolk Lift Services Limited | Other services | 2017 |
| Essex Auto Haus Ltd | Wholesale & retail | 2025 |
| Essex Auto Repairs Ltd | Wholesale & retail | 2013 |
| Essex BI Fold Door Company Ltd | Construction | 2015 |
| Essex Blast Cleaning Ltd | Extraterritorial | 2025 |
| Essex Blinds Ltd | Construction | 2018 |
| Essex Boys Medical Group Ltd | Health & social care | 2024 |
| Essex Boys Property Ltd | Extraterritorial | 2022 |
| Essex Business Partnerships Limited | Other services | 2021 |
| Essex Business Solutions Limited | Real estate | 2023 |
| Essex Car Centre Limited | Wholesale & retail | 2017 |
| Essex Cares Limited | Health & social care | 2008 |
| Essex Catering Ltd | Hospitality | 2021 |
| Essex Cleaning Ltd | Administrative & support | 2013 |
| Essex Coast Organisation Limited | Other services | 2021 |
| Essex Community Foundation | Health & social care | 1995 |
| Essex Community Support Ltd | Health & social care | 2008 |
| Essex Computer Training Ltd. | Information & communication | 2006 |
| Essex County Cricket Club Enterprises Limited | Arts & recreation | 1998 |
| Essex County Cricket Club Nominees Limited | Arts & recreation | 1991 |
| Essex County Cricket Promotions Limited | Arts & recreation | 1980 |
| Essex Cricket Foundation | Arts & recreation | 2010 |
| Essex Cricket in the Community | Arts & recreation | 2006 |
| Essex Cricket Limited | Arts & recreation | 1998 |
| Essex Digger & Dumper Hire Limited | Construction | 2018 |
| Essex DIP Ltd | Manufacturing | 2015 |
| Essex Drinks Limited | Wholesale & retail | 2025 |
| Essex Eagles Limited | Arts & recreation | 1998 |
| Essex Elite Cleaning Limited | Other services | 2015 |
| Essex Employment and Inclusion Ltd. | Health & social care | 2008 |
| Essex Equip Limited | Administrative & support | 2017 |
| Essex Extraction Ltd | Administrative & support | 2023 |
| Essex Family Forum CIC | Other services | 2020 |
| Essex Floor Prep Limited | Construction | 2024 |
| Essex Floor Preparation Limited | Construction | 2018 |
| Essex Forwarding Ltd | Transport & logistics | 2021 |
| Essex Garden Foods Ltd | Manufacturing | 2016 |
| Essex Garden Office Limited | Construction | 2020 |
| Essex Ghost Hunters Ltd | Extraterritorial | 2022 |
| Essex Green Laning Ltd | Wholesale & retail | 2023 |
| Essex Groundwork’S & Civils Ltd | Construction | 2025 |
| Essex Handyman Service Ltd | Construction | 2018 |
| Essex Health & Fitness Limited | Arts & recreation | 2011 |
| Essex Home Finance Ltd | Financial services | 2017 |
| Essex Homes and Lettings Limited | Real estate | 2019 |
| Essex Housing Development LLP | | 2020 |
| Essex Imaging Service Limited | Health & social care | 2008 |
| Essex Industry Hire Ltd | Administrative & support | 2026 |
| Essex Inflatables Ltd | Arts & recreation | 2026 |
| Essex Irrigation Systems Limited | Administrative & support | 2024 |
| Essex Lights Limited | Construction | 2023 |
| Essex Locum GP Ltd | Health & social care | 2019 |
| Essex Loft Ladders Ltd | Construction | 2024 |
| Essex LOG Burners Limited | Wholesale & retail | 2023 |
| Essex Media Hub Ltd | Professional & scientific | 2025 |
| Essex Mindfulness Limited | Wholesale & retail | 2017 |
| Essex Motor Service Ltd | Wholesale & retail | 2022 |
| Essex Motorsport Ltd | Transport & logistics | 2010 |