| Eastern Counties Leisure Craft Ltd | Manufacturing | 2003 |
| Easybus Banyards Group Limited | Transport & logistics | 2024 |
| EB Sound Solutions Limited | Administrative & support | 2025 |
| ECM Events Limited | Arts & recreation | 2017 |
| ECM Resourcing Ltd | Professional & scientific | 2020 |
| Eco Electrical Group Limited | Construction | 2016 |
| Eco Mechanical & Electrical Limited | Construction | 2018 |
| Eco Therma Limited | Wholesale & retail | 2025 |
| Eco-Tech Fire & Security Ltd | Public administration | 2021 |
| Ecoclassics Limited | Manufacturing | 2019 |
| Econowall UK Limited | Manufacturing | 2006 |
| ED Property 1 Ltd | Real estate | 2026 |
| ED Property 2 Ltd | Real estate | 2026 |
| Education Welfare Advisory & Safeguarding Services Ltd | Administrative & support | 2017 |
| Education Welfare Advisory and Support Services Limited | Education | 2014 |
| Edward Valentine Ltd | Arts & recreation | 2009 |
| EEM Support Ltd | Water & waste | 2025 |
| EHM Sales LP | | 2019 |
| EHR Maintenance Ltd | Construction | 2024 |
| Eight Strategies Ltd | Professional & scientific | 2021 |
| Eighteen Plus Support Ltd | Health & social care | 2024 |
| Ejem Holdings Limited | Financial services | 2020 |
| EJT63 Limited | Construction | 2005 |
| Elaris Spinal Health Ltd | Health & social care | 2025 |
| Elemento (Richmond) Limited | Construction | 2020 |
| Elemento (Sileby) Ltd | Construction | 2009 |
| Elemento Taplow Limited | Construction | 2017 |
| Elephant International & Co CIC | Education | 2025 |
| Elephant International Ltd | Education | 2023 |
| Eless Environmental Limited | Water & waste | 2016 |
| Eleven Eleven Productions London Ltd | Arts & recreation | 2026 |
| Elite Consumables Limited | Manufacturing | 2015 |
| Elite MSR Limited | Manufacturing | 2020 |
| Elite Performance Services Ltd | Manufacturing | 2020 |
| Elite Restore Limited | Administrative & support | 2019 |
| Elite Talent Development Ltd | Education | 2024 |
| Ellen Dowie Services Ltd | Information & communication | 2025 |
| Ellie Rose Agency Ltd | Other services | 2020 |
| Ellis Signature Homes Limited | Construction | 2025 |
| Ellwood Properties Limited | Real estate | 2021 |
| Elro Contractors Limited | Construction | 2024 |
| Elsenham Roofing Reclaim Limited | Construction | 2025 |
| Elson Group (Construction) Limited | Administrative & support | 2021 |
| Elson Group (Plant Hire) Limited | Administrative & support | 2023 |
| Eluvis Group Holdings Ltd | Financial services | 2023 |
| ELY (Prickwillow) Management Company Limited | Households | 2006 |
| Email Marketing 4U Limited | Professional & scientific | 2024 |
| Emibrook LLP | | 2023 |
| Emka Construction Ltd | Construction | 2021 |
| Emma Town Limited | Information & communication | 2017 |
| Enul’S Ltd | Real estate | 2024 |
| Envision Bright Ltd | Information & communication | 2021 |
| Epic Event Productions Ltd | Arts & recreation | 2020 |
| Episciences UK Limited | Extraterritorial | 2023 |
| Epitome Pilates Limited | Arts & recreation | 2025 |
| Eppd Limited | Real estate | 2013 |
| Eppendorf Cryotech Limited | Manufacturing | 1994 |
| Equalplace Limited | Real estate | 2002 |
| Equine Training Centre Limited | Agriculture & fishing | 2026 |
| ERC Aesthetics Ltd | Health & social care | 2023 |
| Esmera (Maplestead) Limited | Real estate | 2021 |
| Esmera Limited | Construction | 2023 |
| Esmie Finance Limited | Financial services | 2024 |
| Essential-Cs Ltd | Administrative & support | 2020 |
| Essex Ball Mastery Ltd | Arts & recreation | 2025 |
| Essex Building Services Limited | Construction | 2025 |
| Essex Cryo Works Ltd | Wholesale & retail | 2026 |
| Essex Dance Exclusive Ltd | Extraterritorial | 2025 |
| Essex Developers Limited | Construction | 2021 |
| Essex Engine & MOT Centre Ltd | Wholesale & retail | 2020 |
| Essex Engineering Solutions Limited | Professional & scientific | 2006 |
| Essex Estuaries Farm Cluster CIC | Agriculture & fishing | 2026 |
| Essex Express Couriers Ltd | Transport & logistics | 1998 |
| Essex Flooring Outlet Ltd | Construction | 2020 |
| Essex Fulfilment Ltd | Administrative & support | 2023 |
| Essex Garden Machinery Ltd | Manufacturing | 2022 |
| Essex Gardening Services Limited | Professional & scientific | 2008 |
| Essex Golf LAB Limited | Arts & recreation | 2024 |
| Essex Heritage Workboats CIC | Manufacturing | 2022 |
| Essex Industrial Gases Limited | Wholesale & retail | 2002 |
| Essex Kids Camp Limited | Education | 2023 |
| Essex Landscaping and Ground Maintenance Limited | Construction | 2024 |
| Essex Materials & Manufacturing Ltd | Administrative & support | 2014 |
| Essex Metals & Waste Limited | Water & waste | 2025 |
| Essex Park & Launch Limited | Other services | 2011 |
| Essex Property Developments Limited | Construction | 2011 |
| Essex Restaurants Limited | Hospitality | 2015 |
| Essex Scaffolding (Hire & Sales) Ltd | Administrative & support | 2012 |
| Essex Scaffolding Limited | Construction | 2010 |
| Essex Self Store Limited | Extraterritorial | 2015 |
| Essex Upvc Ltd | Wholesale & retail | 2024 |
| Essex Woodfinishing Ltd | Construction | 2019 |
| Established Energy Solutions Limited | Energy | 2020 |
| Euro Engines UK Ltd | Extraterritorial | 2021 |
| Euro Engines(Essex) Ltd | Wholesale & retail | 2016 |
| EVE & Edward Holdings Limited | Financial services | 2025 |
| Events at the Barn Limited | Hospitality | 2020 |
| Events Factor Limited | Hospitality | 2010 |
| Evie Property Limited | Real estate | 2018 |
| Evolve Coaching and Development Limited | Health & social care | 2021 |