| Hancam Limited | Manufacturing | 1999 |
| Hands Digital Ltd | Information & communication | 2014 |
| Hanjy Consulting Limited | Administrative & support | 2014 |
| Hanjy Investments Limited | Real estate | 2021 |
| Hansap Property Ltd | Real estate | 2026 |
| Hanskarin Healthcare Ltd | Health & social care | 2017 |
| Hanyards Lane Residents Association Limited | Households | 2006 |
| Happy Kids Schoolwear Ltd | Wholesale & retail | 2024 |
| Happy Moves Limited | Transport & logistics | 2011 |
| Happy Tails Clinic Ltd | Professional & scientific | 2024 |
| Happy Wheels Ltd | Construction | 2016 |
| Harding Property Solutions Ltd | Construction | 2024 |
| Hardwycke Services Limited | Professional & scientific | 2018 |
| Hare Street Green Ltd | Professional & scientific | 2021 |
| Harissema Limited | Hospitality | 2022 |
| Harleyford Valley Limited | Mining & quarrying | 2012 |
| Harlow Accountants Limited | Professional & scientific | 2018 |
| Harlow and District Chinese Community Centre Limited | Health & social care | 1999 |
| Harlow and District Sports Trust | Arts & recreation | 1959 |
| Harlow Area Evangelistic Fellowship Limited | Other services | 1977 |
| Harlow Art Trust | Arts & recreation | 2024 |
| Harlow Auto Services Ltd | Wholesale & retail | 2019 |
| Harlow Cafe 2 Ltd | Hospitality | 2025 |
| Harlow Carpentry Ltd | Construction | 2023 |
| Harlow Carpets Limited | Construction | 2018 |
| Harlow Cars Ltd | Transport & logistics | 2023 |
| Harlow Cash and Carry Ltd | Wholesale & retail | 2026 |
| Harlow Citizens Advice Limited | Health & social care | 2009 |
| Harlow Cycle Repairs Limited | Wholesale & retail | 2025 |
| Harlow Driver Training Ltd | Education | 2025 |
| Harlow Education Consortium | Education | 2005 |
| Harlow Essex Cleaning Ltd | Other services | 2019 |
| Harlow Fencing Ltd | Wholesale & retail | 2024 |
| Harlow Glass Limited | Construction | 1996 |
| Harlow Group Limited | Manufacturing | 2005 |
| Harlow Group Storage Ltd | Transport & logistics | 1975 |
| Harlow Home Services Ltd | Administrative & support | 2025 |
| Harlow Home Store Ltd | Wholesale & retail | 2026 |
| Harlow Hybrid Auto Ltd | Wholesale & retail | 2023 |
| Harlow Indian Limited | Hospitality | 2022 |
| Harlow Inspirational Learning Trust | Education | 2015 |
| Harlow International Hostel | Hospitality | 2012 |
| Harlow Manufacturing Limited | Manufacturing | 2015 |
| Harlow Masonic Hall Limited | Other services | 1971 |
| Harlow Micropub Ltd | Wholesale & retail | 2024 |
| Harlow Motors Ltd | Wholesale & retail | 2012 |
| Harlow Nail & Beauty Ltd | Other services | 2024 |
| Harlow Nails Limited | Other services | 2026 |
| Harlow Occupational Health Service Limited | Health & social care | 1955 |
| Harlow Operations Limited | Information & communication | 2014 |
| Harlow POP UK Ltd | Health & social care | 2025 |
| Harlow Raiders Cricket Club CIC | Arts & recreation | 2025 |
| Harlow Roofing & Sons Limited | Construction | 2024 |
| Harlow Roofing Limited | Administrative & support | 2008 |
| Harlow Scrum Club CIC | Arts & recreation | 2025 |
| Harlow South PCN Limited | Health & social care | 2024 |
| Harlow Springs Limited | Manufacturing | 2007 |
| Harlow Taxi Hire Limited | Administrative & support | 2011 |
| Harlow Tekkers Football Club Ltd | Arts & recreation | 2022 |
| Harlow Town Greyhound Entertainment Limited | Arts & recreation | 2012 |
| Harlow Travel Ltd | Transport & logistics | 2023 |
| Harlow Tyre Group Ltd | Wholesale & retail | 2021 |
| Harlow United Football Club Ltd | Other services | 2017 |
| Harlynwood (13-18) Management Company Limited | Households | 1976 |
| Harmony African Investment Consults Ltd | Administrative & support | 2024 |
| Harmony Beauty Academy Ltd | Education | 2024 |
| Harmony Clinical Consultancy Limited | Health & social care | 2024 |
| Harmony Home Rentals Limited | Real estate | 2023 |
| Harn Trading Limited | Water & waste | 2015 |
| Harpell Limited | Administrative & support | 2025 |
| Harriet Health Care Services Ltd | Health & social care | 2013 |
| Harris Motorcycles Ltd | Wholesale & retail | 2017 |
| Hart HR Ltd | Administrative & support | 2024 |
| Hartsmere UK Limited | Construction | 2016 |
| Hartvin Ltd | Real estate | 2005 |
| Harve's Interiors Limited | Construction | 2005 |
| Harvesters Bakery Ltd | Manufacturing | 2021 |
| Harvey Estates Group Ltd | Real estate | 2024 |
| HAS Metal Work Limited | Manufacturing | 2016 |
| HAS Residentials Ltd | Real estate | 2021 |
| Haskett Ltd | Agriculture & fishing | 2000 |
| Haskoch Limited | Construction | 2021 |
| Hassle Free Education Ltd | Education | 2019 |
| Hastingwood Property Management Company Ltd | Households | 2016 |
| Hatch Properties Limited | Administrative & support | 2007 |
| Hatch Transforms Ltd | Professional & scientific | 2012 |
| Hatter Publishing Limited | Information & communication | 2025 |
| Haunted Hearts Limited | Wholesale & retail | 2024 |
| Have Blue Broadcast Media Ltd | Information & communication | 2025 |
| Havelit Valves UK Ltd | Construction | 2025 |
| Havenwise Logistics Ltd | Transport & logistics | 2025 |
| Havenzone Services Ltd | Wholesale & retail | 2026 |
| Havering Fitness Ltd | Arts & recreation | 2025 |
| Havering Maids Ltd | Administrative & support | 2020 |
| Havilah Vines Ltd | Information & communication | 2026 |
| Hawkenbury 26 Ltd | Real estate | 2024 |
| Hawkins Cabling Ltd | Construction | 2026 |
| Haych EM Ltd | Other services | 2018 |
| Hayden Fencing Supplies Ltd | Wholesale & retail | 2021 |
| Haymarket Court Management Limited | Households | 2022 |