| HC23 Ltd | Real estate | 2023 |
| HCC Protective Coatings Limited | Wholesale & retail | 1998 |
| HCE Facilities Ltd | Administrative & support | 2026 |
| HD Business Branding Limited | Professional & scientific | 2025 |
| HD Inspections NDT Ltd | Manufacturing | 2021 |
| HD Office Solutions Limited | Transport & logistics | 2021 |
| HDH Locums Ltd | Health & social care | 2021 |
| HDY Properties Ltd | Construction | 2014 |
| Head Street (Property Management) Limited | Administrative & support | 2008 |
| Headway Essex | Health & social care | 1991 |
| Heal the Womb Ltd | Other services | 2015 |
| Healing Hearts & Minds CIC | Health & social care | 2025 |
| Health Care HUT Ltd | Health & social care | 2021 |
| Health Care PHU Ltd | Administrative & support | 2019 |
| Health Hosts Ltd | Administrative & support | 2010 |
| Health Talks Community Training CIC | Education | 2025 |
| Health-Home-Happiness Ltd | Real estate | 2025 |
| Healthcare Concierge Consulting Ltd | Health & social care | 2015 |
| Healthcare Homes (2020) Limited | Financial services | 2020 |
| Healthcare Homes (Genesis) Limited | Financial services | 2019 |
| Healthcare Homes (LSC) Limited | Health & social care | 2009 |
| Healthcare Homes (Spring) Limited | Health & social care | 2020 |
| Healthcare Homes Group Limited | Health & social care | 2005 |
| Healthcare Homes Holdings Limited | Professional & scientific | 2008 |
| Healthcare Homes Limited | Extraterritorial | 2015 |
| Healthy Content Limited | Information & communication | 2014 |
| Healthy Pages Ltd | Administrative & support | 2010 |
| Heard Supply & Install Limited | Construction | 2018 |
| Heart 2 Heart Balloons Ltd | Wholesale & retail | 2010 |
| Heart Consultancy Limited | Professional & scientific | 2025 |
| Hearth & HAY Ltd | Hospitality | 2026 |
| Hearth Cornerstone Ltd | Construction | 2024 |
| Hearth Design Ltd | Professional & scientific | 2025 |
| Hearthstone Properties Ltd | Households | 2018 |
| Hearttec Direct Limited | Wholesale & retail | 2023 |
| Hearttec Solutions Limited | Wholesale & retail | 2021 |
| Heatec Heating and Plumbing Limited | Construction | 2002 |
| Heath Stables & Storage Limited | Administrative & support | 2016 |
| Heather Rabbatts Limited | Professional & scientific | 2022 |
| Heatherset Close Residents Association (Esher) Ltd | Real estate | 2004 |
| Heathlands (Snettisham) Management Company Limited | Households | 2016 |
| Heathwest Developments Ltd | Construction | 2007 |
| Heating Solutions (Essex) Limited | Administrative & support | 2020 |
| Heatsafe Installations Limited | Construction | 2010 |
| Heavenly Hybrid Limited | Wholesale & retail | 2011 |
| Heavenly Stars Fireworks Limited | Extraterritorial | 2007 |
| Heavens Above Fireworks Limited | Other services | 2004 |
| Heavy Sumo Ltd | Information & communication | 2010 |
| Hebel Ltd | Construction | 2025 |
| Hecra Ltd | Health & social care | 2020 |
| Hector the Choco Labo Ltd | Information & communication | 2026 |
| Heddle's Homes & Landscaping Limited | Professional & scientific | 1984 |
| Hedingham Contracts Ltd | Construction | 2006 |
| Heeny Limited | Administrative & support | 2022 |
| Heeton Management (UK) Limited | Professional & scientific | 2020 |
| Hegston Limited | Information & communication | 2011 |
| Heia Wharf Colchester Management Limited | Households | 2010 |
| Heinzmann Regulateurs Europa Limited | Manufacturing | 2005 |
| Hela Tech Ltd | Information & communication | 2024 |
| Helen Batchelor Consulting Ltd | Professional & scientific | 2025 |
| Helicopter Charter Limited | Extraterritorial | 2012 |
| Helicopter Landing Solutions Ltd | Transport & logistics | 2023 |
| Helios Nexu Ltd | Information & communication | 2024 |
| Helios Ventilation Systems Limited | Manufacturing | 1993 |
| Helix Platforms Ltd | Information & communication | 2026 |
| Hello Dental Ltd | Health & social care | 2025 |
| Helm College Ltd | Other services | 2026 |
| Helm Navigation Limited | Wholesale & retail | 2003 |
| Helping Hand Therapy Ltd | Health & social care | 2020 |
| Helping Hands Housing Group Limited | Hospitality | 2023 |
| Helux Systems Ltd | Manufacturing | 2022 |
| Hemings Engineering Limited | Manufacturing | 1998 |
| Hemingsworth Ltd | Administrative & support | 2013 |
| Henco Homes Ltd | Real estate | 2023 |
| Henley Developments (South East) Limited | Construction | 2020 |
| Henley's of Wivenhoe Limited | Hospitality | 2012 |
| Henry Ashe Projects Ltd. | Construction | 2002 |
| Henry C Morrill Investments Limited | Real estate | 2009 |
| Henry Hall Build Ltd | Construction | 2017 |
| Henry Hall Landscapes Ltd | Administrative & support | 2019 |
| Henry Maston Limited | Professional & scientific | 2017 |
| Henry Rose Lettings Limited | Real estate | 2012 |
| Henry Samuel Projects Ltd | Construction | 2015 |
| Hephaestus Projects UK Ltd | Information & communication | 2015 |
| Heppell.Net Limited | Education | 2005 |
| HER Portrait Limited | Information & communication | 2019 |
| Herd Club Consultants Limited | Professional & scientific | 2023 |
| Here 4 YOU Limited | Administrative & support | 2016 |
| Here for Your Support Ltd | Construction | 2024 |
| Herewood Services Limited | Wholesale & retail | 2008 |
| Heritage Building Conservation Services Limited | Construction | 2017 |
| Heritage Homes (East Anglia) Limited | Construction | 1996 |
| Heritage Horticultural Lawn Care Limited | Construction | 2018 |
| Heritage Oak Cartlodges Limited | Manufacturing | 2026 |
| Heritage Park (Watton) Residents Management Company Limited | Households | 2023 |
| Heritage U.K Trading Ltd | Wholesale & retail | 2018 |
| Hermes Abrasives Limited | Manufacturing | 1984 |
| Herney Limited | Construction | 2018 |
| Hero Automatic Driving School Ltd | Education | 2026 |
| Hero Driving School Ltd | Education | 2021 |