| Hedgerows (Epping) Management Company Limited | Households | 2011 |
| Hemnall Investments Limited | Construction | 2016 |
| Hemnall Limited | Construction | 2010 |
| Hempsell Astronautics Limited | Professional & scientific | 2013 |
| Hereward Green 1955 Limited | Extraterritorial | 2014 |
| Heritage Vehicles Limited | Administrative & support | 2023 |
| HEY Resourcing Limited | Professional & scientific | 2023 |
| HH Ceramic Art Ltd | Manufacturing | 2023 |
| HH2 Properties Ltd | Real estate | 2020 |
| HHG (Essex) Ltd | Construction | 2024 |
| Hicksy Ltd | Professional & scientific | 2026 |
| Higgs Building (Services) Ltd | Construction | 2013 |
| Higgs Property Services Limited | Real estate | 2020 |
| High Class Interiors Limited | Extraterritorial | 2003 |
| High Performance Cricket Limited | Wholesale & retail | 2018 |
| Highfield Green Management Company Limited | Households | 1982 |
| Highfield Green Properties Management Company Limited | Financial services | 2022 |
| Highlux Limited | Construction | 2009 |
| Highrow Limited | Wholesale & retail | 2018 |
| Hillcrest Investment Limited | Real estate | 2022 |
| Hinebrook Homes Limited | Construction | 2005 |
| Historic Trades Ltd | Information & communication | 2025 |
| Hlca Limited | Information & communication | 2019 |
| HMS Heating Ltd | Construction | 2020 |
| Hobby Hires Ltd | Administrative & support | 2025 |
| Hodges and Cooper Property Services Ltd | Construction | 2025 |
| Home Counties Sporting Limited | Professional & scientific | 2016 |
| Home of the Good Groove Records Ltd | Wholesale & retail | 2024 |
| Hoppers Nurseries Ltd | Health & social care | 2022 |
| Hornchurch Airspace Limited | Real estate | 2022 |
| Hortus Gardens Ltd | Administrative & support | 2023 |
| Hotgg Music Limited | Information & communication | 2025 |
| House of Elliott Interiors Limited | Professional & scientific | 2019 |
| House of Lloyd Ltd | Hospitality | 2025 |
| House of Socials Content Creation Ltd | Professional & scientific | 2026 |
| Hoverworks Studio Limited | Information & communication | 2025 |
| Howe Structural Consultants Limited | Professional & scientific | 2019 |
| HPC Chigwell Limited | Wholesale & retail | 2020 |
| HPM Estate Ltd | Real estate | 2006 |
| HPM Partners LLP | | 2023 |
| Hudson Music Europe Limited | Wholesale & retail | 1998 |
| Hunters Hall Farm Ltd | Agriculture & fishing | 2023 |
| Hydra Ltd | Transport & logistics | 2023 |
| I Building Solutions Ltd | Construction | 2019 |
| I GOT YOU Ltd | Transport & logistics | 2025 |
| I NE3D Ltd | Manufacturing | 2014 |
| I-Genome Ltd | Professional & scientific | 2025 |
| IAN Kennard & Co Limited | Real estate | 1986 |
| IBZ Construction Ltd | Real estate | 2022 |
| IBZ Motorz Limited | Administrative & support | 2018 |
| IBZ Rentals Ltd | Wholesale & retail | 2020 |
| Icarus Project Solutions Limited | Information & communication | 2006 |
| Ice Event Decor Limited | Other services | 2019 |
| Idology Partnership Limited | Education | 2015 |
| Iduna Lifestyle Limited | Agriculture & fishing | 2023 |
| IG1RAPHAEL1007 Property Ltd | Real estate | 2024 |
| IG2EASTERN604 Property Ltd | Real estate | 2024 |
| Ilusso Limited | Wholesale & retail | 2018 |
| Imminent Ltd | Professional & scientific | 2018 |
| Imperial Companies Ltd | Agriculture & fishing | 2025 |
| Impressionable Ltd | Information & communication | 2026 |
| Infinity Brickwork Ltd | Construction | 2023 |
| Infinity Technology Construction Limited | Construction | 2023 |
| Inkara Technologies Limited | Administrative & support | 2011 |
| Innis James Ltd | Administrative & support | 2017 |
| INT Consultancy Limited | Information & communication | 2013 |
| Intercm Ltd | Construction | 2024 |
| International JBC Ltd | Professional & scientific | 2019 |
| Intricom Ltd | Information & communication | 2018 |
| Investment Product Development ( NO 2 ) Limited | Other services | 2021 |
| Investment Product Development Limited | Other services | 2006 |
| Isles Tallow Limited | Manufacturing | 2026 |
| Itam Intelligence Limited | Information & communication | 2009 |
| ITC Valuers Limited | Professional & scientific | 2006 |
| Ivonik Limited | Wholesale & retail | 2019 |
| Ivor Chinman Accountants Ltd | Professional & scientific | 1979 |
| IVY Power Limited | Extraterritorial | 2023 |
| IVY Projects Ltd | Construction | 2021 |
| J 8 Limited | Administrative & support | 2018 |
| J C a Investments Limited | Real estate | 2007 |
| J C Smith Cleaning Services Ltd | Administrative & support | 2018 |
| J D L Taxation Services Limited | Professional & scientific | 2021 |
| J.M. Insulations Limited | Construction | 1980 |
| J.W. Plasterworks Ltd | Construction | 2012 |
| J3 Roofing & Facades Limited | Construction | 2024 |
| JA Fitness & Coaching Ltd | Arts & recreation | 2023 |
| Jacob Levi Limited | Information & communication | 2014 |
| Jammit Holdings Limited | Information & communication | 2024 |
| Japanese Essex Ltd | Hospitality | 2026 |
| Jaskiran Hare Limited | Information & communication | 2017 |
| Jasmin Secure Ltd | Administrative & support | 2020 |
| Jayfx Ltd | Information & communication | 2022 |
| Jaygold Limited | Information & communication | 2002 |
| JB Offshore Ltd | Professional & scientific | 2026 |
| JBM Electrical Group Ltd | Construction | 2022 |
| Jbos Investments Ltd | Real estate | 2026 |
| JCF Retail Limited | Administrative & support | 2016 |
| JDB Boyce Holdings Limited | Real estate | 2021 |
| Jennings (SL) Limited | Arts & recreation | 2011 |
| Jennings Racing (2006) Limited | Arts & recreation | 2006 |