| H & D Properties Ltd | Real estate | 1998 |
| H & H 1 Ltd | Real estate | 2015 |
| H & H 2 Limited | Real estate | 2020 |
| H & K Corporation (Essex) Ltd | Hospitality | 2013 |
| H & K Technologies Limited | Information & communication | 2017 |
| H & L Training Limited | Administrative & support | 2011 |
| H & R Property Limited | Real estate | 2004 |
| H 160 Limited | Professional & scientific | 2020 |
| H and K Design Ltd | Administrative & support | 2017 |
| H Appiagyei Ltd | Public administration | 2026 |
| H Architecture Ltd | Professional & scientific | 2025 |
| H Edwards Group Limited | Financial services | 2022 |
| H F Thomas Ltd | Real estate | 2021 |
| H J Tenger (Chelmsford) Ltd | Hospitality | 2018 |
| H Mortgage Brokers Ltd | Financial services | 2025 |
| H P Marshall Ltd | Professional & scientific | 2016 |
| H T Environmental Limited | Other services | 2024 |
| H W a P Limited | Construction | 2025 |
| H&G Development Group Limited | Professional & scientific | 2021 |
| H&H Legacy Limited | Construction | 2022 |
| H&H Medpro Limited | Construction | 2020 |
| H&M Investment Management Ltd | Financial services | 2007 |
| H&Rj Investments Limited | Real estate | 2022 |
| H&Rj Properties Ltd | Real estate | 2025 |
| H-Two Consultants Limited | Professional & scientific | 1989 |
| H. J. Hardy Plant Limited | Administrative & support | 2019 |
| H.C.M Healthcare Limited | Health & social care | 2023 |
| H.E. Smith & SON Nurserymen (Essex) Limited | Agriculture & fishing | 1972 |
| H.J. Warder Limited | Agriculture & fishing | 1979 |
| H.T.M.G. Ltd | Administrative & support | 2003 |
| H2G2 Consulting Ltd | Administrative & support | 2026 |
| Habendum Limited | Real estate | 1996 |
| Habere Ltd | Construction | 2018 |
| Habibmed Ltd | Health & social care | 2018 |
| Habitab Homes Limited | Real estate | 2024 |
| Haddon Events Limited | Arts & recreation | 2018 |
| Hadeeq Ltd | Real estate | 2026 |
| Hadham Health Limited | Financial services | 2017 |
| Hadleigh Bakery Limited | Real estate | 1961 |
| Hadleigh Bakery Properties Limited | Real estate | 2006 |
| Hadley's Plumbing and Heating Limited | Construction | 2023 |
| Hadlow Consultancy Ltd | Professional & scientific | 2024 |
| Haempath Services Limited | Education | 2024 |
| Hainsford Energy (Blyth Harbour) Limited | Energy | 1991 |
| Hainsford Renewable Energy Limited | Professional & scientific | 2006 |
| Hair (Chelmsford) Limited | Other services | 2015 |
| Hair by Victoria Limited | Wholesale & retail | 2021 |
| Hair Station Chelmsford Ltd | Other services | 2020 |
| Hair Status Limited | Other services | 2015 |
| Hairy Bikers Limited | Wholesale & retail | 2009 |
| Hairy Bikers Television Limited | Administrative & support | 2010 |
| Halal Fried Chicken Stepney Limited | Hospitality | 2012 |
| Halders Holdings Limited | Financial services | 2025 |
| Haley Electrical Services Limited | Construction | 2009 |
| Half Pint Nursery Ltd | Education | 2023 |
| Halfloop Limited | Information & communication | 2022 |
| Halford Offices Ltd | Real estate | 2024 |
| Hall Farm Cottages Ltd | Hospitality | 2014 |
| Hall Lane Golf Ltd | Arts & recreation | 2001 |
| Hallaton Holdings Limited | Financial services | 2026 |
| Hallfield Investments Limited | Real estate | 2018 |
| Hallmark Classics Limited | Wholesale & retail | 2023 |
| Hallmark Developments (Essex) Limited | Construction | 2003 |
| Hallmark Homes Limited | Extraterritorial | 2018 |
| Hallrose Contract Furniture Limited | Manufacturing | 2000 |
| Halls Property Group Limited | Real estate | 2020 |
| Hallscroft Finance Limited | Construction | 1994 |
| Halo Business Support Limited | Professional & scientific | 2012 |
| HAM Engineering Ltd | Professional & scientific | 2026 |
| Hamilton Property Portfolio Ltd | Real estate | 2022 |
| Hamilton Richards Consultants Ltd | Professional & scientific | 2022 |
| Hamilton Workforce Solutions Limited | Administrative & support | 2024 |
| Hamlet Financial Solutions Limited | Financial services | 2016 |
| Hamlin Group Ltd | Hospitality | 2024 |
| Hamlin Leisure Limited | Hospitality | 2022 |
| Hamm Property Ltd | Real estate | 2016 |
| Hammonds Creative Studio Limited | Professional & scientific | 2023 |
| Hammonds Farm Limited | Agriculture & fishing | 2012 |
| Hamptons Sports & Leisure Limited | Arts & recreation | 2016 |
| Hamstore Limited | Other services | 2017 |
| Hancock and Parsons Limited | Administrative & support | 2010 |
| Hand in Hand NRG Limited | Agriculture & fishing | 2007 |
| Hand-Knitted Productions Ltd | Information & communication | 2025 |
| Handiest MEN Property Improvements Ltd | Construction | 2019 |
| Handley & Associates Ltd | Professional & scientific | 2020 |
| Handley-Chase Holdings Limited | Financial services | 2023 |
| Hands Really Heal Co. Limited | Health & social care | 2003 |
| Handyfix Limited | Construction | 2010 |
| Hanger & Hearth Ltd | Wholesale & retail | 2026 |
| Hanging Gardens Nurseries Limited | Wholesale & retail | 2004 |
| Hanging Gardens Services & Sundries Limited | Wholesale & retail | 1986 |
| Hanlon & Sons Developments Ltd | Construction | 2025 |
| Hannah Clarkson Ltd | Information & communication | 2021 |
| Hannah Verrall Limited | Professional & scientific | 2025 |
| Hannahs Properties Ltd | Real estate | 2019 |
| Hanno Reliance Care Limited | Administrative & support | 2024 |
| Hanovia Solutions Limited | Administrative & support | 2005 |
| Hans Consultants Limited | Extraterritorial | 2005 |
| Happich Auto Trim Limited | Manufacturing | 1967 |
| Happy Eden Garden Ltd | Hospitality | 2024 |