| Hassett Management Limited | Real estate | 2020 |
| Hatdoye Trading Limited | Real estate | 2007 |
| Hattie Gemma Doris Afshar Limited | Extraterritorial | 2022 |
| Haute Beauty Limited | Wholesale & retail | 2021 |
| Havant Hampshire Plumbing Services Ltd | Construction | 2025 |
| Havant Light Opera | Arts & recreation | 2009 |
| Havant Window Cleaning Limited | Administrative & support | 2021 |
| Havilah Life Cosmetics Ltd | Manufacturing | 2023 |
| Hawk Family Office Limited | Administrative & support | 2023 |
| Hawkfield Estates Limited | Real estate | 2025 |
| Hawl Limited | Administrative & support | 2008 |
| Hawthorne Electrical Ltd | Construction | 2020 |
| Hayco Commercial Contractors Ltd | Construction | 2023 |
| Hayco. Limited | Construction | 2019 |
| Haylea Property Ltd | Real estate | 2018 |
| Hayler's Hounds Limited | Other services | 2018 |
| Hayling Island Donkey Sanctuary CIC | Agriculture & fishing | 2023 |
| Haylock & Pittman Holdings Limited | Financial services | 2025 |
| Haymark Ltd | Real estate | 2021 |
| Haythorn Sports & Events Limited | Administrative & support | 2020 |
| Hayward Builders Ltd | Construction | 2025 |
| HBC Builders Ltd | Construction | 2024 |
| HBW 2017 Limited | Real estate | 2017 |
| HC (UK) Limited | Wholesale & retail | 2009 |
| HC Aquatics Ltd | Agriculture & fishing | 2020 |
| Hclm Property Limited | Real estate | 2026 |
| HD Homescapes Ltd | Construction | 2026 |
| HDB Design & Build Limited | Extraterritorial | 2020 |
| HDB Holdings Limited | Extraterritorial | 2020 |
| HDR Medical Services Limited | Health & social care | 2020 |
| HDS Property Development Limited | Real estate | 2022 |
| Hdtv Limited | Information & communication | 2005 |
| Head & Down Ltd | Wholesale & retail | 2025 |
| Head & Jones Hair Ltd | Other services | 2018 |
| Head Case Cigars Ltd | Wholesale & retail | 2017 |
| Healing Smile Limited | Health & social care | 2024 |
| Health @ Handleys Holdings Ltd | Hospitality | 2025 |
| Health Circles Limited | Health & social care | 1998 |
| Health Development Consulting Limited | Health & social care | 2006 |
| Health Portrait Consultancy Limited | Financial services | 2020 |
| Health Portrait Limited | Financial services | 2020 |
| Healthcare Technology Limited | Professional & scientific | 1976 |
| Healthy Living Serenity Limited | Wholesale & retail | 2020 |
| Hearing Plus Ltd | Health & social care | 2023 |
| Heart and Dagger Southern Ltd | Other services | 2026 |
| Heart of the Lion Ltd | Hospitality | 2026 |
| Heath Crook Limited | Agriculture & fishing | 2016 |
| Heating & Cooling Ltd | Construction | 2025 |
| Heavenly Hair and Beauty Ltd | Other services | 2021 |
| Hector Holdings Limited | Real estate | 2026 |
| Hectors Decor Ltd | Construction | 2026 |
| Hedgers Plastering Ltd | Construction | 2022 |
| Hedgetree Ltd. | Information & communication | 2016 |
| Heelan Associates Ltd | Professional & scientific | 2006 |
| Heelan Holdings Ltd | Real estate | 2019 |
| Heelanhub Limited | Administrative & support | 2022 |
| Heidi's Swiss Patisserie Limited | Wholesale & retail | 1990 |
| HEK Holdings Limited | Financial services | 2019 |
| Hella Holdings Limited | Financial services | 2025 |
| Hellcrest Capital Ltd | Real estate | 2026 |
| Hello Ventures Limited | Education | 2025 |
| Hello What Ltd | Information & communication | 2018 |
| Helloskinco Limited | Wholesale & retail | 2023 |
| Hells- Tempress A&D Limited | Information & communication | 2025 |
| Helm Fire Protection Ltd | Public administration | 2021 |
| Help With Wills Limited | Other services | 2020 |
| HEN and Associates Limited | Administrative & support | 2022 |
| Henda Europe Limited | Wholesale & retail | 2015 |
| Henge IT Limited | Information & communication | 2023 |
| Henley Plumbing & Heating Limited | Construction | 2007 |
| Henning Homes Ltd | Real estate | 2025 |
| Henry Morris Homes Limited | Construction | 2015 |
| Henry's Coffee Shop Limited | Hospitality | 2024 |
| Hepburn Advisory Ltd | Professional & scientific | 2024 |
| Hepburn Holmes Ltd | Hospitality | 2025 |
| Hepworth Electrical Ltd | Construction | 2024 |
| Herbert Terry & Sons Limited | Manufacturing | 2003 |
| Here 4 Zero Ltd | Professional & scientific | 2023 |
| Here NOR There Ltd | Hospitality | 2024 |
| Heritage Life Limited | Financial services | 2016 |
| Heritage Oak Carpentry Limited | Construction | 2023 |
| Heritage Steam Supplies Limited | Extraterritorial | 2008 |
| Hermes Elite Ltd | Health & social care | 2016 |
| Hermitage London Limited | Wholesale & retail | 2023 |
| Herr Homes Limited | Construction | 2020 |
| Herriotts Ltd | Arts & recreation | 2026 |
| Hewson Consultancy Ltd | Professional & scientific | 2025 |
| Hexagon Enterprises Ltd | Manufacturing | 2024 |
| HHG Renovations Ltd | Real estate | 2024 |
| Hi-Tech Mouldings Limited | Manufacturing | 1983 |
| Hi-Technology Group Limited | Professional & scientific | 1999 |
| Hi-Technology Holdings Limited | Financial services | 2014 |
| Hibiki Entertainment Limited | Information & communication | 2018 |
| Hickingbotham Consulting Limited | Professional & scientific | 2021 |
| Hicks Medical Services Limited | Health & social care | 2019 |
| HID Security Services Limited | Administrative & support | 2024 |
| Hidden Places Adventure Tours Limited | Administrative & support | 1999 |
| Hide Away Campervans Ltd | Manufacturing | 2019 |
| Hides Access Solutions Ltd | Construction | 2024 |
| HIGGY2022 Limited | Hospitality | 2022 |