| Heronash NS Limited | Construction | 2025 |
| Herongate Solutions Ltd | Construction | 2016 |
| Hesoyam Ltd | Wholesale & retail | 2023 |
| Hestia Property Essex Ltd | Real estate | 2022 |
| HEY CAB Ltd | Transport & logistics | 2023 |
| HEY Karma Retreats Ltd | Administrative & support | 2023 |
| HEY Karma Yoga Ltd | Education | 2023 |
| HEY Presto Group Ltd | Administrative & support | 2026 |
| Heyward Brickwork Limited | Construction | 2022 |
| HHM (Essex) Limited | Other services | 2026 |
| Hi-Flow GAS Solutions Limited | Construction | 2017 |
| Hi-Spec Design Build Maintain Ltd | Construction | 2019 |
| Hi-Tec Sports Limited | Financial services | 1974 |
| Hidalgo Funding Limited | Financial services | 2021 |
| Hidden Ingredients Limited | Hospitality | 2025 |
| Hidesk Ltd | Information & communication | 2024 |
| Higgins Air Conditioning Limited | Construction | 2021 |
| Higgins Property Recruitment Limited | Households | 2013 |
| High Maintenance Label Ltd | Wholesale & retail | 2025 |
| High Performance Facility Consulting Ltd | Professional & scientific | 2026 |
| High Purity Service Ltd | Professional & scientific | 2023 |
| High Range Reels Ltd | Wholesale & retail | 2025 |
| Highbury Leisure Limited | Hospitality | 2005 |
| Highgrade Property Consultancy Ltd | Construction | 2024 |
| Highlands Properties (Chelmsford) Limited | Real estate | 2022 |
| Highlands Properties Limited | Real estate | 1997 |
| Highlands Property Investments Limited | Real estate | 2000 |
| Highlands Trading Limited | Real estate | 2024 |
| Highview Shareholdings Limited | Financial services | 2014 |
| Highwood Heating and Cooling Limited | Construction | 2018 |
| Hilaria Limited | Wholesale & retail | 2004 |
| Hilburns Carpentry Ltd | Construction | 2013 |
| Hilder Gaius Limited | Health & social care | 2022 |
| Hillbrow Engineering Services Ltd | Professional & scientific | 2026 |
| Hilling Homes Ltd | Real estate | 2023 |
| Hillmann Ventures Limited | Real estate | 2024 |
| Hills & Whyte Holdings Limited | Financial services | 2022 |
| Hills & Whyte Properties Limited | Financial services | 2020 |
| Hills Brothers Properties Ltd | Real estate | 2019 |
| Hilltop Views (Essex) Limited | Real estate | 2023 |
| Hilltop Views Airbnb Limited | Other services | 2024 |
| Hilltop Views Leisure Limited | Arts & recreation | 2024 |
| Hintons LLP | | 2004 |
| Hintons Property Services Limited | Real estate | 2013 |
| Hipgrave Plastering Limited | Construction | 2023 |
| Hippo Homes Developments Limited | Real estate | 2010 |
| Hippo Homes LLP | | 2010 |
| HIRA2024 Ltd | Hospitality | 2024 |
| Hire Heroes Ltd | Administrative & support | 2026 |
| Hirevan Ltd | Transport & logistics | 2025 |
| HIS Favour Care Limited | Health & social care | 2015 |
| HIS Grace Mission Ltd | Education | 2021 |
| HIS Kingdom Church UK Ltd | Other services | 2023 |
| HIT and Run Ltd | Wholesale & retail | 2020 |
| HJH Limited | Construction | 2019 |
| HK Global Trading Ltd | Wholesale & retail | 2026 |
| HLF Build Ltd | Construction | 2023 |
| Hltsocial Ltd | Professional & scientific | 2025 |
| HM Estella Limited | Administrative & support | 2018 |
| HM Ghills Ltd | Real estate | 2023 |
| HM Longley Ltd | Real estate | 2023 |
| HM Project Assurance & Audit Limited | Information & communication | 1992 |
| HM350 Ltd | Real estate | 2023 |
| Hmc&P Holdings Limited | Financial services | 2023 |
| HME (NW) Limited | Construction | 2018 |
| HMJ Consulting Ltd | Professional & scientific | 2026 |
| HMK Energy Ltd | Construction | 2018 |
| HMO Lets Ltd | Households | 2018 |
| HMP Investments (Essex) Limited | Real estate | 2025 |
| HMS Plant and Tool Hire Limited | Administrative & support | 2014 |
| Hobbs Electrical Installations Ltd | Construction | 2023 |
| Hockton Interior Solutions Ltd | Construction | 2021 |
| Hockton Limited | Construction | 2014 |
| Hogsbay Limited | Health & social care | 2021 |
| Holding Construction Limited | Construction | 2021 |
| Holiday Elite Limited | Administrative & support | 2006 |
| Holiday Medics Ltd. | Administrative & support | 2025 |
| Holland House Productions Ltd | Information & communication | 2024 |
| Holland Park Boxing Ltd | Arts & recreation | 2022 |
| Holland Trucks (Essex) Ltd | Wholesale & retail | 2014 |
| Hollins Decorating Ltd | Construction | 2017 |
| Hollmark Ltd | Construction | 2003 |
| Holly Court Denture Clinic Limited | Other services | 2015 |
| Holly-May Ltd | Wholesale & retail | 2025 |
| Hollybrook Group Services Limited | Construction | 2019 |
| Holmes Holmes Limited | Real estate | 2006 |
| Holric Services Ltd | Transport & logistics | 2014 |
| Home Accent Limited | Wholesale & retail | 2013 |
| Home Creations Essex Limited | Wholesale & retail | 2015 |
| Home Drainage Protection Service Ltd | Water & waste | 2021 |
| Home Excellence Ltd | Wholesale & retail | 2024 |
| Home From Home Support Services Ltd | Health & social care | 2021 |
| Home of Hearts Ltd | Wholesale & retail | 2019 |
| Home Run Expert Ltd | Construction | 2022 |
| Home Safe Property Services Limited | Construction | 2017 |
| Homeflow Properties Ltd | Construction | 2026 |
| Homes for YOU Constructions Ltd | Construction | 2023 |
| Homes of Distinction Limited | Professional & scientific | 2015 |
| Homeworks Contracts Ltd | Construction | 2025 |
| Honey Bloom Creator Network Ltd | Information & communication | 2026 |