| Honey Pipkin Ltd | Administrative & support | 2022 |
| Honeys Training Club Limited | Arts & recreation | 2026 |
| Honeyz Tanning Products Ltd | Wholesale & retail | 2022 |
| Hooked Leigh Limited | Hospitality | 2020 |
| Hooli Mooli Trading Company Limited | Wholesale & retail | 2012 |
| Hope Brothers Property Limited | Real estate | 2025 |
| Horley Road Ltd | Construction | 2022 |
| Hornchurch Football Club (2005) Limited | Arts & recreation | 2005 |
| Horticultured Limited | Administrative & support | 2012 |
| Horwitz Associates Limited | Professional & scientific | 2016 |
| Hoskins Electrical & Telecommunications Limited | Construction | 2022 |
| Host Unusual Limited | Administrative & support | 2017 |
| Hot Drop Drinks Ltd | Wholesale & retail | 2025 |
| Hot Masala Limited | Hospitality | 2024 |
| Hot Products FBA Ltd | Wholesale & retail | 2025 |
| Hot Steel Services Ltd | Construction | 2023 |
| House of Cars Kent Limited | Administrative & support | 2018 |
| House of Gain Limited | Arts & recreation | 2015 |
| House of Hair Essex Limited | Other services | 2020 |
| House of Kaiora Limited | Wholesale & retail | 2026 |
| House of Nirvana Limited | Real estate | 2023 |
| Hove Heating Limited | Construction | 2018 |
| Howe & Knight Limited | Hospitality | 2025 |
| Hozzamedia Industries Limited | Information & communication | 2004 |
| HP Fabrication Ltd | Agriculture & fishing | 2017 |
| HPR Property Management Ltd | Real estate | 2024 |
| HPS Supplies Ltd | Wholesale & retail | 2015 |
| HTN Beauty Ltd | Other services | 2014 |
| HTT Regsolutions Ltd. | Professional & scientific | 2017 |
| Hub Accounting Ltd | Professional & scientific | 2013 |
| Hubbard Computer Services Ltd. | Information & communication | 1998 |
| Huddersfield Leathers Ltd | Wholesale & retail | 1999 |
| Hudhost Ltd | Other services | 2011 |
| Hudson House Leigh on Sea RTM Company Ltd | Households | 2026 |
| Hudson Roofing and Cladding Ltd | Construction | 2016 |
| Hudson THP Limited | Professional & scientific | 2011 |
| Hudsons Accountants Limited | Extraterritorial | 2019 |
| Hughes Holdings Group Limited | Financial services | 2025 |
| Hughes Parks Limited | Hospitality | 2025 |
| Hugo Investments Limited | Financial services | 2026 |
| Hullbridge Sports 1947 Ltd | Arts & recreation | 2025 |
| Humanuka Ltd | Professional & scientific | 2025 |
| Hunneybel Group Ltd | Construction | 2015 |
| Hunters Lane Management Company Limited | Households | 2006 |
| Hurleys Plumbing & Heating Limited | Construction | 2008 |
| Hurlock Greyhounds Ltd | Agriculture & fishing | 2024 |
| Hurrell Notary Limited | Professional & scientific | 2024 |
| Hutton Nova Ltd | Real estate | 2024 |
| HUX Acquisitions Ltd | Wholesale & retail | 2025 |
| Hybrid Hub Gym Ltd | Arts & recreation | 2024 |
| Hydrospec Holdings Limited | Financial services | 2024 |
| HYE Studio Limited | Manufacturing | 2025 |
| Hygiene Control Limited | Health & social care | 2009 |
| Hyperneph Software Limited | Information & communication | 2020 |
| Höme.Ai Care Limited | Information & communication | 2026 |
| I a Building Services Ltd | Construction | 2017 |
| I AM Atticus Ltd | Information & communication | 2012 |
| I CAN DO This Limited | Administrative & support | 2015 |
| I Fit OUT Ltd | Construction | 2013 |
| I G M (UK) Ltd | Construction | 2011 |
| I J W Property Holdings Ltd | Real estate | 2025 |
| I Love Tradesmen Limited | Other services | 2012 |
| I R G Building Services Limited | Professional & scientific | 2014 |
| I T C Independent Tool Company Ltd | Professional & scientific | 2010 |
| I-Dakota Ltd | Real estate | 2021 |
| IA2O Ltd | Information & communication | 2010 |
| Iamhodling Ltd | Financial services | 2018 |
| IAN and Sons Removals Ltd | Transport & logistics | 2023 |
| IAN Green Consultancy Services Ltd | Professional & scientific | 2014 |
| IAN Removals & Sons Ltd | Transport & logistics | 2021 |
| IAS Loudspeakers Limited | Other services | 2024 |
| Ibuild Interior Services Limited | Construction | 2016 |
| Ibuild Newco Ltd. | Financial services | 2019 |
| IC Sparkz Ltd | Professional & scientific | 2025 |
| Iceberg Cyber Security Europe Limited | Administrative & support | 2017 |
| Iceberg Cyber Security Limited | Administrative & support | 2016 |
| Iceinfo Limited | Real estate | 1985 |
| Icelab Essex Cryo Limited | Other services | 2020 |
| Iceni Solutions UK Ltd | Construction | 2022 |
| Icon Beauty & Skin Limited | Other services | 2024 |
| Icon Design Build & Maintenance Ltd | Construction | 2018 |
| Iconic Living Garden Contractors Ltd | Administrative & support | 2018 |
| Iconsult Payment Solutions Limited | Professional & scientific | 2016 |
| ICU Holdings (Essex) Limited | Financial services | 2021 |
| ICU Properties Limited | Real estate | 2021 |
| Icubed Home Cinema Limited | Construction | 2014 |
| Idance Academy UK Ltd | Education | 2025 |
| Idance Studios Limited | Education | 2015 |
| Ideal Carpentry & Construction Limited | Construction | 2024 |
| Ideal Fishbar (Eastwood) Limited | Hospitality | 2015 |
| Ideal Landscapes (Essex) Limited | Administrative & support | 2020 |
| Iechyd DA Property Limited | Real estate | 2024 |
| Iejb Ltd | Real estate | 2024 |
| IFM RE Ltd | Real estate | 2022 |
| IGE Heating Ltd | Construction | 2024 |
| Igloo Music UK Limited | Other services | 2010 |
| Ignite Fireplace Designs Limited | Construction | 2020 |
| Ignite Recruitment Services Ltd | Administrative & support | 2018 |
| Ignosco Solutions Ltd | Professional & scientific | 2012 |
| Ignus Management Consultants Ltd | Professional & scientific | 2019 |