| Essex & Rayleigh Roofing Limited | Construction | 2003 |
| Essex Air Source Ltd | Other services | 2021 |
| Essex Bodies Limited | Manufacturing | 1992 |
| Essex Bodybuilders Limited | Manufacturing | 1991 |
| Essex Builder Construction Ltd | Manufacturing | 2024 |
| Essex Business Supplies Limited | Wholesale & retail | 2023 |
| Essex Commercial Management Limited | Professional & scientific | 2015 |
| Essex District Waste Removal Ltd | Water & waste | 2026 |
| Essex Drywall Solutions Limited | Construction | 2017 |
| Essex Inventories Ltd | Households | 2022 |
| Essex Oyster Company Ltd | Wholesale & retail | 2020 |
| Essex Textiles Limited | Administrative & support | 2009 |
| Essex Van Sales Limited | Wholesale & retail | 2023 |
| Essex Welding Services Limited | Manufacturing | 2011 |
| Estian Limited | Construction | 2017 |
| Estuary Mews Ltd | Households | 2013 |
| ESW Legal Limited | Professional & scientific | 2014 |
| ESW Limited | Professional & scientific | 1996 |
| ESW Team Management Limited | Professional & scientific | 2011 |
| Eswca Limited | Real estate | 2016 |
| Eternal Joinery Ltd | Manufacturing | 2025 |
| EV Posts Limited | Manufacturing | 2017 |
| EVA (UK) Limited | Wholesale & retail | 1999 |
| EVE - Rosey Ltd | Other services | 2019 |
| Event Structures (Southern) Ltd | Other services | 2025 |
| Everymind Solutions Ltd | Health & social care | 2019 |
| Evie Photo Ltd | Professional & scientific | 2025 |
| Evolution Demolition Services Limited | Construction | 2018 |
| Evolution Diamond Drilling Limited | Construction | 2021 |
| Evolution Digital Media Ltd | Information & communication | 2011 |
| Evolution Enabling Services Limited | Construction | 2015 |
| Evolution Group Holdings Limited | Financial services | 2015 |
| Evolution Tree Care Ltd | Agriculture & fishing | 2020 |
| Exelania Ltd | Professional & scientific | 2025 |
| Exetas Assessment Limited | Professional & scientific | 2026 |
| Expo Earth Ltd | Professional & scientific | 2025 |
| Express Security Essex Ltd | Administrative & support | 2022 |
| Expressions Productions Limited | Education | 2014 |
| Expyro Limited | Construction | 2025 |
| Extrapurpose Ltd | Real estate | 2024 |
| EYE Technology Limited | Manufacturing | 1995 |
| F&M Electrical Ltd | Construction | 2022 |
| F&S Chipy Ltd | Hospitality | 2025 |
| F. Withrington & Sons Limited | Construction | 1998 |
| F.Rexhmati Ltd | Other services | 2018 |
| Fabricae Interiors Ltd | Construction | 2013 |
| Factory First (Essex) Limited | Wholesale & retail | 2002 |
| Fair Trade UK Limited | Other services | 2004 |
| Fairbrooke Projects Ltd | Construction | 2023 |
| Fairfield Cleaning Services Limited | Administrative & support | 2011 |
| Fairview Financial Management Ltd | Financial services | 2022 |
| Falcon 2022 Limited | Financial services | 2022 |
| Falkor Group Limited | Professional & scientific | 2022 |
| Fambridge Consultancy Services Limited | Information & communication | 2025 |
| Famruch Limited | Information & communication | 2017 |
| Farm Fresh Garage Limited | Wholesale & retail | 2018 |
| Fast Print UK Limited | Other services | 2020 |
| FAT Pasta Ltd | Hospitality | 2024 |
| Fation Rexhmati Ltd | Other services | 2024 |
| Favola Ltd | Wholesale & retail | 2009 |
| Fayedhd Limited | Other services | 2025 |
| Feather and Flick Ltd | Other services | 2019 |
| Fedelta Consultancy Ltd | Financial services | 2008 |
| Fenn Business Advisory Limited | Administrative & support | 2018 |
| Fenton Boats Ltd | Hospitality | 2021 |
| FGN Carpentry & Construction Ltd | Construction | 2024 |
| FGS Consultants Ltd | Professional & scientific | 2024 |
| Fidual Holdings Limited | Health & social care | 2016 |
| Fifth Gear Transport Services Ltd | Transport & logistics | 2010 |
| Filiz Food Limited | Hospitality | 2023 |
| Financially Fit Planning Ltd | Professional & scientific | 2019 |
| Finchley Rentals Limited | Real estate | 2025 |
| Findyourmotor Ltd | Wholesale & retail | 2023 |
| Finerex Limited | Financial services | 2025 |
| Fingersafe GB Limited | Extraterritorial | 2003 |
| Fingersafe International Limited | Extraterritorial | 1996 |
| Fingersafe Limited | Wholesale & retail | 2004 |
| Fingersafe Worldwide Limited | Wholesale & retail | 2014 |
| Finishing Touch Repairs Limited | Wholesale & retail | 2024 |
| Finsbury Group Ltd | Financial services | 2025 |
| Fintech Resourcing Limited | Information & communication | 2011 |
| Firemain UK Limited | Construction | 1995 |
| Firminger Real Estate Ltd | Construction | 2006 |
| First Class Sealants Limited | Construction | 2016 |
| First Response Hire and Sales Limited | Construction | 2017 |
| First Response Hire Limited | Construction | 2017 |
| First Response Sales Limited | Construction | 2017 |
| First Response Site Services Limited | Administrative & support | 2002 |
| First Response Site Supplies Ltd | Extraterritorial | 2010 |
| First Response Tool Hire Limited | Extraterritorial | 2011 |
| First Time Cars (Rayleigh) Ltd | Wholesale & retail | 2024 |
| Fish Kitchen Bargoed Ltd | Hospitality | 2025 |
| Fish Kitchen Maesycwmmer Ltd | Hospitality | 2025 |
| Flagship Aggregator Ltd | Professional & scientific | 2023 |
| Flagship Energy Ltd | Administrative & support | 2019 |
| Flat Peak Ltd | Information & communication | 2020 |
| Flaxman Partners Limited | Professional & scientific | 1999 |
| Flaxmans Group Limited | Financial services | 2015 |
| Fleet Insulation Company Limited | Construction | 1981 |
| Fleet Insulation Holdings Limited | Construction | 2010 |