| Hallam Heating Limited | Construction | 2015 |
| Halls Painting Contractors Ltd | Construction | 2002 |
| Halton Electrical Limited | Construction | 2016 |
| Hamill & Clark Limited | Real estate | 2009 |
| Hamilton Square RTM Company Limited | Households | 2013 |
| Hamlets Tavern Ltd | Hospitality | 2021 |
| Handling Industrial Training Ltd | Construction | 2019 |
| Handy Stamps Ltd | Wholesale & retail | 2017 |
| Handyplumb Limited | Construction | 2014 |
| Hani Super Store Ltd | Wholesale & retail | 2025 |
| Hanmer Enterprises Ltd | Agriculture & fishing | 2023 |
| Hannaby & Jones Ltd | Manufacturing | 2006 |
| Hannah Ellis Design Limited | Professional & scientific | 2024 |
| Hanover Holdings Ltd | Real estate | 2024 |
| Hanshold Limited | Construction | 2019 |
| Hanso Property Holdings Ltd | Hospitality | 2025 |
| HAO WEI Wrexham Ltd | Hospitality | 2023 |
| Happy Hedgehog Foods Ltd | Manufacturing | 2019 |
| Hardel Developments Ltd | Construction | 2024 |
| Hardhat Systems Limited | Financial services | 2020 |
| Hardy & Davies Autoelectrical Limited | Wholesale & retail | 2007 |
| Hare N Husky Co Ltd | Information & communication | 2023 |
| Harken Financial Limited | Financial services | 2019 |
| Harlec Electrical Ltd | Professional & scientific | 2022 |
| Harmony Holiday Lets Limited | Real estate | 2024 |
| Harmony Property Holdings Limited | Real estate | 2025 |
| Haroldson Ltd | Manufacturing | 2021 |
| Harper Stays Ltd | Real estate | 2025 |
| Harperletting Ltd | Real estate | 2023 |
| Harputlu Ltd | Hospitality | 2025 |
| Harrington Light Haulage Ltd | Transport & logistics | 2017 |
| Harrow Road Management Company Limited | Households | 1989 |
| Harthill Estates Limited | Administrative & support | 2015 |
| Harthill Homes Limited | Administrative & support | 2015 |
| Hartley & Co Construction Limited | Construction | 2026 |
| Hartley and Parry Developments Limited | Construction | 2012 |
| Hartley and Parry Homes Limited | Real estate | 2024 |
| Harvey James Construction Limited | Construction | 2023 |
| Harvi Limited | Professional & scientific | 2008 |
| HAS Engineering Solutions Ltd | Professional & scientific | 2020 |
| Hashtag Partnershipsolutions Limited | Administrative & support | 2014 |
| Haswell Brothers LLP | | 2017 |
| Haswell Services Limited | Administrative & support | 2016 |
| HAT Catering Ltd | Hospitality | 2025 |
| Hauck UK Limited | Wholesale & retail | 2019 |
| Haulfryn Care Limited | Health & social care | 2008 |
| Haus of Sass by Stephanie Limited | Other services | 2024 |
| Havana Poke Bowl Ltd | Hospitality | 2025 |
| Havarco Limited | Professional & scientific | 2002 |
| Have Investments CYF | Public administration | 2025 |
| Have Property Investment CYF. | Real estate | 2026 |
| Havelock James Property Limited | Real estate | 2017 |
| Haven Pathways Community Interest Company | Education | 2025 |
| Havilland Active Ventures Limited | Financial services | 2026 |
| Havilland Active Ventures Management Company LLP | | 2026 |
| Havilland Health UK Limited | Professional & scientific | 2025 |
| Hawarden Road Management Company Limited | Households | 2006 |
| Hawk Alloys Limited | Wholesale & retail | 2009 |
| Hawkesbury Trading Limited | Construction | 2023 |
| Hawkey Limited | Professional & scientific | 2013 |
| Hawksmere Properties Limited | Real estate | 1988 |
| Hawthorn Commercial Training Services Limited | Transport & logistics | 2020 |
| Hayakawa International (UK) Limited | Manufacturing | 1993 |
| Hayes Healthcare Limited | Health & social care | 2016 |
| Haymarket Block Services Ltd | Real estate | 2025 |
| Haywards Homes Limited | Real estate | 2022 |
| Hazelhurst Lettings Ltd | Real estate | 2017 |
| HD Bathrooms and Heating Ltd | Construction | 2024 |
| HD Cleaning Limited | Administrative & support | 2024 |
| Head Office Hair Ltd | Other services | 2013 |
| Head Office Training Academy Ltd | Education | 2020 |
| Headsmart Global ACY Limited | Administrative & support | 2025 |
| Headsmart Global Ltd | Information & communication | 2019 |
| Health and Safety Academy Limited | Education | 2021 |
| Healthcare Professionals Properties Limited | Real estate | 2023 |
| Healthfull Holdings Group Limited | Financial services | 2014 |
| Healthfull Holdings Limited | Financial services | 2014 |
| Hearfield Mashru Consultancy Ltd | Professional & scientific | 2024 |
| Heart at Home Vets Ltd | Professional & scientific | 2025 |
| Heart of Planning Limited | Information & communication | 2025 |
| Heat Service (Wrexham) Ltd | Construction | 2019 |
| Heatkey Installations Ltd | Construction | 2013 |
| Heatkey Ltd | Extraterritorial | 2013 |
| Heatsource Energy Solutions Ltd | Administrative & support | 2017 |
| Heaven Coffee Shop Limited | Hospitality | 2017 |
| Heed Developments Ltd | Real estate | 2007 |
| Height Adjustable Mounts Ltd | Manufacturing | 2020 |
| Helander Properties Limited | Real estate | 2025 |
| Helios Quality Systems Ltd | Professional & scientific | 2015 |
| Helix Surfacing Ltd | Extraterritorial | 2011 |
| Hello Sausage Ltd | Real estate | 2021 |
| Hellwing Construction Ltd | Professional & scientific | 2007 |
| Helm Haulage Limited | Transport & logistics | 2011 |
| Help to Buy (Wales) Limited | Financial services | 2013 |
| Helpbase Limited | Wholesale & retail | 2012 |
| Helping Hands WRX CIC | Health & social care | 2022 |
| Helpmerent.Co.Uk Ltd | Real estate | 2015 |
| Hendy Agriculture Ltd | Agriculture & fishing | 2021 |
| Henry & Bell Limited | Health & social care | 2017 |
| Henry Davies Limited | Construction | 2020 |