| HDC Products Ltd | Wholesale & retail | 2026 |
| Hearth & Stone Outdoor Living Ltd | Administrative & support | 2025 |
| Heartwood Compass Ltd | Manufacturing | 2018 |
| Heat Site Limited | Construction | 2023 |
| Hedging Plants Direct Limited | Wholesale & retail | 2022 |
| Heirloom Tiaras Ltd | Administrative & support | 2006 |
| HEN and Ribs Ltd | Hospitality | 2025 |
| Hepburn Contractors Limited | Construction | 2015 |
| Hereditable Developments Limited | Real estate | 1995 |
| Herts Heating Group Ltd | Construction | 2025 |
| HG7 Ltd | Real estate | 2026 |
| Hgv-Pro-Drive Ltd | Transport & logistics | 2025 |
| Hide Properties Limited | Real estate | 2025 |
| High Tech Expert Ltd | Other services | 2019 |
| Highmark Consulting and Services Ltd | Professional & scientific | 2024 |
| Hilo Print & Graphics Limited | Manufacturing | 2021 |
| HJM Radiators UK Limited | Wholesale & retail | 2025 |
| Hnhl Property Ltd | Other services | 2026 |
| Holland Roofing and Building Ltd | Construction | 2017 |
| Hollowtree Modular Ltd | Manufacturing | 2025 |
| Hollywood Farm Vineyard Ltd | Agriculture & fishing | 2021 |
| Holmwood Electrical Services Limited | Construction | 2015 |
| Holywells Catering Ltd | Hospitality | 2015 |
| Home Adapt Ltd | Construction | 2024 |
| Home CHO Limited | Hospitality | 2026 |
| Home Heating (Essex) Limited | Construction | 2006 |
| Home Preserver Ltd | Construction | 2019 |
| Homeflex Property Management Ltd | Real estate | 2024 |
| Homehubservices Ltd | Construction | 2026 |
| Homeview Surveillance Limited | Construction | 2007 |
| Homewick Ltd | Wholesale & retail | 2020 |
| Honest Dynamics Limited | Information & communication | 2024 |
| Hoorain Mart Limited | Wholesale & retail | 2025 |
| Hot TUB & Garden Party Hire Limited | Households | 2021 |
| House of Lola Ltd | Other services | 2024 |
| House of Plastercraft Ltd | Construction | 2015 |
| House of Webster Limited | Professional & scientific | 2025 |
| Houses to Homes (Essex) Limited | Construction | 2020 |
| Hrmny Ltd | Health & social care | 2024 |
| HS Clacton Ltd | Hospitality | 2025 |
| Hsdn Invest Ltd | Real estate | 2025 |
| Hucks Properties Limited | Households | 2024 |
| Humphriestrio Grounds Maintenance Ltd | Administrative & support | 2025 |
| Hunt Health Care Investments Limited | Financial services | 2023 |
| Hunt Health Care Property Limited | Real estate | 2023 |
| Hvac Mechanical Solutions Ltd | Construction | 2025 |
| HW Audio Visual Limited | Administrative & support | 2021 |
| Hyper Rare Limited | Wholesale & retail | 2025 |
| I.D.S Accountants Essex Ltd | Professional & scientific | 2025 |
| I.D.S Accountants Ltd | Professional & scientific | 2017 |
| IA Apparel Ltd | Wholesale & retail | 2021 |
| Iceni Medical Solutions Limited | Health & social care | 2024 |
| Ideal Leasing and Finance Limited | Administrative & support | 2007 |
| IDP Transport Services Ltd | Transport & logistics | 2025 |
| IML Fulfilment Limited | Administrative & support | 2008 |
| Immediate Representation Limited | Financial services | 1996 |
| Imperial Care Transport Ltd | Transport & logistics | 2021 |
| Imperial Minibus Transport Ltd | Transport & logistics | 2025 |
| Impresario Theatre School Ltd | Arts & recreation | 2022 |
| Impresario Theatre School Workshops Ltd | Arts & recreation | 2022 |
| IN for a Penny Accountancy Services Limited | Professional & scientific | 2019 |
| IN for a Penny Bookkeeping Services Limited | Professional & scientific | 2019 |
| Independent Assessments Consultancy Ltd | Health & social care | 2023 |
| Independent Powered Access (IPA) Ltd | Manufacturing | 2021 |
| Infinity Air Ltd | Construction | 2025 |
| Initiate SET Construction Ltd | Manufacturing | 2023 |
| Insanity Tattoo Studio Ltd | Arts & recreation | 2026 |
| Insight Psychotherapy Limited | Extraterritorial | 2025 |
| Inspiring Safety Ltd | Professional & scientific | 2025 |
| Integrity Care Services Limited | Health & social care | 2007 |
| Intellux Ltd | Construction | 2026 |
| International Marketing & Distribution Limited | Administrative & support | 2008 |
| Interpreting Direct Limited | Other services | 2014 |
| Intrinsic Music & Publishing Ltd | Information & communication | 2015 |
| Intuifish Ltd | Manufacturing | 2021 |
| Iordache Transport Express Ltd | Transport & logistics | 2025 |
| IPS Training Ltd | Education | 2024 |
| Iron Valve Plumbing Limited | Construction | 2026 |
| Ironworks Gym Clacton Ltd | Arts & recreation | 2016 |
| Isherwood Limited | Extraterritorial | 2002 |
| Ispan Limited | Administrative & support | 2010 |
| Isparkle Cleaning Services Limited | Administrative & support | 2021 |
| Istanbul Barbering Ltd | Other services | 2020 |
| IT Ninjas Limited | Information & communication | 2014 |
| IT Solution Services Limited | Wholesale & retail | 2001 |
| IT Solution Services Trustees Limited | Administrative & support | 2025 |
| Italia Refinish Limited | Professional & scientific | 2014 |
| Itglowstyle Ltd | Wholesale & retail | 2026 |
| ITS Girl Powder Ltd | Other services | 2026 |
| IVY Homes (UK) Limited | Real estate | 2002 |
| IVY House Residential Limited | Real estate | 2017 |
| IVY Innovations (UK) Limited | Manufacturing | 2002 |
| J & S Hutchby Ltd | Real estate | 2025 |
| J & S Spaces Ltd | Real estate | 2025 |
| J a Electrical Installations Ltd | Energy | 2020 |
| J Bravo Holdings Limited | Extraterritorial | 2024 |
| J Bravo Limited | Extraterritorial | 2024 |
| J Cooper Electrical Limited | Construction | 2015 |
| J D Harman Ltd | Construction | 2025 |
| J F Aldous (Holdings) Limited | Professional & scientific | 1987 |