| Harmonious Web Ltd | Information & communication | 2023 |
| Harmony and Eddoes Direct Ltd | Wholesale & retail | 2018 |
| Harmony Leisure Ltd | Hospitality | 2010 |
| Harmony Property Limited | Real estate | 2018 |
| Harmony Residential Homes Ltd | Health & social care | 2014 |
| Haroldshaw Enterprise Limited | Extraterritorial | 2024 |
| Harowe Homes Ltd | Real estate | 2025 |
| Harper Victoria Estate Ltd | Construction | 2025 |
| Harper-Rose Business Services Ltd | Professional & scientific | 2018 |
| Harrington Electrical Contractor Ltd | Construction | 2024 |
| Harrington Motor Company Ltd | Wholesale & retail | 2021 |
| Harringtons Advisory Limited | Other services | 2012 |
| Harrirad Ltd | Health & social care | 2019 |
| Harris & Hiscock Limited | Other services | 2004 |
| Harris & Hiscock Property Limited | Real estate | 2011 |
| Harris Bathrooms Ltd | Construction | 2013 |
| Harris Cars (South) Ltd | Wholesale & retail | 2015 |
| Harris Housing Limited | Real estate | 2004 |
| Harris Roofing Limited | Construction | 2005 |
| Harris Tarrant Properties Ltd | Construction | 2024 |
| Harrison Clarke Limited | Professional & scientific | 2013 |
| Harrison Gray Financial Services Limited | Other services | 2012 |
| Harrison-Smith Consulting Limited | Information & communication | 2025 |
| Harrop Property Services Limited | Other services | 2006 |
| Harry Edward Homes Ltd | Real estate | 2020 |
| Harry Mcgougan Limited | Professional & scientific | 2011 |
| Harry’S Car Trade Ltd | Wholesale & retail | 2025 |
| Harsiddhi Limited | Wholesale & retail | 2013 |
| Hart Bathrooms & Kitchens Ltd | Construction | 2025 |
| Hart Hill (Hythe) Limited | Households | 1997 |
| Hart Human Factors Limited | Professional & scientific | 2025 |
| HART2HART Mobility Limited | Wholesale & retail | 2023 |
| Hartley Court Management Company Limited | Households | 1999 |
| Hartley Medical Limited | Health & social care | 2022 |
| Hartley Resourcing Limited | Professional & scientific | 2007 |
| Harts & Mortons Hair & Beauty Ltd | Other services | 2020 |
| Haruka Holdings Limited | Financial services | 2021 |
| Harvey Consultancy Services Limited | Professional & scientific | 2023 |
| Harvey Food & Drinks Ltd | Wholesale & retail | 2019 |
| Harvey Superstore Ltd | Wholesale & retail | 2021 |
| Harvin Tax Accountants Limited | Professional & scientific | 2025 |
| Harwoods Developments Limited | Manufacturing | 2011 |
| HAS Building Services Limited | Administrative & support | 2008 |
| HAS Electrical Limited | Construction | 2002 |
| Hashtaghungry. Ltd | Hospitality | 2025 |
| Hasloc Ltd | Wholesale & retail | 2022 |
| Hassall Free Solutions (Hants) Limited | Professional & scientific | 2018 |
| Hassan & Hussain Ltd | Transport & logistics | 2019 |
| Hassan Office Supplies Limited | Wholesale & retail | 2025 |
| Hasta Coffee Limited | Hospitality | 2017 |
| Haste Holdings Ltd | Financial services | 2025 |
| Haste Limited | Manufacturing | 1997 |
| Hastings ST. Investments Ltd | Real estate | 2024 |
| Hatch and Barrel Ltd | Hospitality | 2026 |
| Hatchard Developments Ltd | Construction | 2012 |
| Hatchmead Epoch UK Limited | Wholesale & retail | 2025 |
| Hats Business Incorporated Ltd | Wholesale & retail | 2025 |
| Hatstand Theatre Company Limited | Education | 2025 |
| Hattie Rickards Jewellery Limited | Manufacturing | 2021 |
| Hatton Hortus Ltd | Wholesale & retail | 2022 |
| Hattrick Electrical Ltd | Construction | 2020 |
| Haul for Good CIC | Professional & scientific | 2024 |
| Haul Merch Ltd | Wholesale & retail | 2023 |
| Haulers Wheel Limited | Administrative & support | 2023 |
| Haulin Logistics Ltd | Transport & logistics | 2025 |
| Hauntys Ltd | Manufacturing | 2022 |
| Haus Coast Limited | Manufacturing | 2023 |
| Haus of Pink Limited | Wholesale & retail | 2024 |
| Hausco Property Investors Limited | Real estate | 2017 |
| Hausen Homes & Investments Limited | Construction | 2019 |
| Hauxy Brickwork Ltd | Construction | 2024 |
| Havant Motor Services Limited | Wholesale & retail | 2014 |
| Havari Ltd | Information & communication | 2026 |
| Havelock Chambers RTM Company Limited | Households | 2010 |
| Havelock Properties Ltd | Real estate | 2023 |
| Havelock Road Flats Management Company Limited | Real estate | 2017 |
| Haven Doors Limited | Real estate | 2025 |
| Haven Harbour Investments Ltd | Real estate | 2024 |
| Haven HR Ltd | Administrative & support | 2022 |
| Haven Industries Limited | Manufacturing | 1993 |
| Haven Pathway Homes C.I.C. | Real estate | 2025 |
| Haven Windows Limited | Wholesale & retail | 2014 |
| Havencroft Healthcare Limited | Financial services | 2017 |
| Havendale Visualisation Ltd | Professional & scientific | 2016 |
| Havenly Cleaning Limited | Administrative & support | 2026 |
| Havenly PVT Limited | Wholesale & retail | 2024 |
| Haverly Holdings Ltd | Financial services | 2020 |
| Haverly Homes Ltd | Real estate | 2020 |
| Haviland Signalling Ltd | Construction | 2018 |
| Hawk Lana Limited | Professional & scientific | 2004 |
| Hawkeye Data Ltd | Information & communication | 2024 |
| Hawkins Catering Limited | Hospitality | 2011 |
| Hawkins Clock Co Limited | Wholesale & retail | 2019 |
| Hawkins Court (Marchwood) Management Company Limited | Households | 1994 |
| Hawkins Lifting Limited | Construction | 2014 |
| Haworth Electrical Services Ltd | Construction | 2015 |
| Hawthorn Stories Ltd | Other services | 2019 |
| Hayaat Modestwear Ltd | Wholesale & retail | 2022 |
| Hayatullah Jamal Ltd | Wholesale & retail | 2025 |
| Haydon END Farm Management Limited | Real estate | 2020 |