| Hayton Bridge Accountancy Limited | Professional & scientific | 2011 |
| Hayward Events Limited | Administrative & support | 2016 |
| HAZ & SAM Property Solutions Ltd | Real estate | 2022 |
| Hazell Construction Limited | Construction | 2011 |
| Hazelwood Bar & Restaurant Ltd | Hospitality | 2016 |
| HB Couriers Ltd | Transport & logistics | 2022 |
| HB Servicing Ltd | Wholesale & retail | 2026 |
| HB UK Tyres Ltd | Manufacturing | 2024 |
| HBM 1958 Investments Limited | Financial services | 2019 |
| Hbnt Group Ltd | Education | 2004 |
| Hbry Consulting Limited | Professional & scientific | 2024 |
| HBS Developments (Essex) Ltd | Construction | 2017 |
| HCF Contract Furniture Ltd | Manufacturing | 2011 |
| HCO Digital Limited | Information & communication | 2021 |
| HD Dreams Limited | Wholesale & retail | 2021 |
| Head Spa Chelmsford Ltd | Other services | 2024 |
| Headline Chelmsford Ltd | Other services | 2022 |
| Headwaysolutionsconsulting Limited | Information & communication | 2022 |
| Headwill Limited | Wholesale & retail | 2025 |
| Heal by LJ Ltd | Other services | 2022 |
| Health & Healing Limited | Health & social care | 2003 |
| Health and Social Ltd | Public administration | 2022 |
| Health Assessment and Aftercare Limited | Health & social care | 2025 |
| Health League Limited | Information & communication | 2015 |
| Health Life London Ltd | Health & social care | 2023 |
| Health Personnel Limited | Health & social care | 2005 |
| Health Sparkle Limited | Health & social care | 2022 |
| Healthaxis Solutions Limited | Professional & scientific | 2025 |
| Healthcare Analytics Solutions Limited | Health & social care | 2016 |
| Healthcare Management Services (UK) Ltd | Health & social care | 2010 |
| Healthcare North East Limited | Wholesale & retail | 1995 |
| Healthcare Outsourcing Solutions Ltd | Administrative & support | 2025 |
| Healthcare Staffing Solutions Ltd | Other services | 2016 |
| Hearing Help Essex Limited | Health & social care | 2006 |
| Hearthstone Supported Living Ltd | Health & social care | 2026 |
| Heartly Healing Limited | Education | 2021 |
| Heat Pump Designs Ltd | Professional & scientific | 2012 |
| Heath Medical Limited | Health & social care | 2020 |
| Heathbray Consulting Ltd | Professional & scientific | 2009 |
| Heather Partnership Ltd | Financial services | 2018 |
| Heather Thomas Ltd | Professional & scientific | 2013 |
| Heatherstone Consultants Limited | Real estate | 2005 |
| Heating and Plumbing Property Installations Limited | Construction | 2004 |
| Heavyhaul (Chelmsford) Limited | Manufacturing | 1957 |
| Heavymatter Labs Ltd | Information & communication | 2026 |
| Hebrews Ltd | Education | 2013 |
| Hecray Company Limited | Construction | 1971 |
| Hectic Hippo Limited | Real estate | 2017 |
| Hedex Software Ltd | Information & communication | 2023 |
| Hedingham Cafe UK Ltd | Hospitality | 2024 |
| Height Excellence Limited | Administrative & support | 2022 |
| Helen Rollason Heal Cancer Charity | Health & social care | 1996 |
| Helex Ironwork Limited | Manufacturing | 2016 |
| Helix Electrical Fire and Security Ltd | Construction | 2026 |
| Helixed Halo Limited | Professional & scientific | 2010 |
| Hembrough Enterprises Limited | Professional & scientific | 2016 |
| Henderson Product Distribution Ltd | Wholesale & retail | 2026 |
| Henderson-Rose Healthcare Ltd | Health & social care | 2021 |
| Hennessy Family Law Limited | Professional & scientific | 2017 |
| Henry Irwin Acquisitions Ltd | Real estate | 2019 |
| Henry Lewi Practice Limited | Health & social care | 2015 |
| Henry RAY Homes Limited | Administrative & support | 2013 |
| Henry RAY Trading Ltd | Wholesale & retail | 2017 |
| Henshall Green Limited | Professional & scientific | 2013 |
| Hepworth Partners Ltd | Professional & scientific | 2025 |
| Heracles Holdings Ltd | Administrative & support | 2017 |
| Heracles Ltd | Information & communication | 2022 |
| Herbs of Earth Ltd | Wholesale & retail | 2025 |
| Heritage Decor Ltd | Construction | 2016 |
| Heritage Leisure Limited | Professional & scientific | 1996 |
| Heritage Paving & Landscapes Ltd | Administrative & support | 2024 |
| Hern Pocknells Limited | Professional & scientific | 2022 |
| Heron Court Management Company (Ongar) Limited | Households | 1990 |
| Herringbone Capital Partners Limited | Financial services | 2014 |
| Herringbone Partners Limited | Professional & scientific | 2013 |
| Heshtec Limited | Health & social care | 2025 |
| Hestia Property Solutions Ltd | Hospitality | 2022 |
| Hewleys Sports and Leisurewear Limited | Wholesale & retail | 2023 |
| HEX Management Ltd | Professional & scientific | 2023 |
| Heyjhma Limited | Health & social care | 2025 |
| HFH Group Limited | Financial services | 2020 |
| HFK Medical Solutions Ltd | Health & social care | 2023 |
| HGS IT Limited | Information & communication | 2016 |
| Hgsb (Alexander Lane Shenfield) LLP | | 2025 |
| Hgsb (Meadway Cuffley) LLP | | 2025 |
| Hgsb (the Paddocks Ongar) LLP | | 2025 |
| HH Contractors Ltd | Construction | 2022 |
| Hhdh Limited | Transport & logistics | 2020 |
| Hhex Investments Ltd | Real estate | 2023 |
| Hi-Five Limited | Professional & scientific | 2007 |
| Hickling Music Services Ltd | Extraterritorial | 2019 |
| Hidden Flavours Ltd | Hospitality | 2025 |
| Hidden Leaders Limited | Education | 2022 |
| Hidraulika UK Ltd | Wholesale & retail | 2004 |
| Hiforce Properties Ltd | Real estate | 2023 |
| Higdon & Co Limited | Professional & scientific | 2009 |
| Higgs & Co Properties Ltd | Real estate | 2025 |
| High Energy Fuels Limited | Water & waste | 2017 |
| High House Farm (Open Space) Management Company Limited | Households | 2024 |
| High House Weddings Limited | Hospitality | 2014 |