| HMD Evergreen Property Management Ltd | Real estate | 2024 |
| HMD Medical Logistics Ltd | Transport & logistics | 2025 |
| HMD Property Group Ltd | Households | 2022 |
| HMS Group of Companies Ltd | Wholesale & retail | 2023 |
| HMT Engineering Group Ltd | Manufacturing | 2000 |
| HMT UK Group Limited | Financial services | 2020 |
| HN Contracting Ltd | Construction | 2015 |
| HN Plant Limited | Manufacturing | 2019 |
| Hoard Hunters Limited | Extraterritorial | 2013 |
| Hobbs Butler Limited | Wholesale & retail | 1997 |
| Hojicha Ltd | Wholesale & retail | 2019 |
| Holford Nutrition Limited | Manufacturing | 2017 |
| Holland Park Computers Ltd | Information & communication | 2010 |
| Hollands Properties (Aylesbury) Limited | Real estate | 1961 |
| Hollingsworth Combat Academy Ltd | Education | 2025 |
| Hollis Songs Limited | Information & communication | 1983 |
| Holly Court Properties Limited | Real estate | 1988 |
| Hollydene House Residents Association Limited | Households | 1992 |
| Hollygound Property Management RTM Company Ltd | Real estate | 2016 |
| Holme Aquariums Limited | Agriculture & fishing | 2022 |
| Holy COW Tea Ltd | Wholesale & retail | 2020 |
| Home Counties Therapy Ltd | Health & social care | 2020 |
| Home Guard Ltd | Construction | 2015 |
| Home Nest Essential Limited | Wholesale & retail | 2025 |
| Home South Limited | Real estate | 2001 |
| Homecountycoaches Limited | Transport & logistics | 2025 |
| Homefree Automation Ltd | Construction | 2025 |
| Homelake Ltd | Wholesale & retail | 2021 |
| Homemaid Exclusive Services Ltd | Administrative & support | 2026 |
| Homerace Developers Ltd | Real estate | 2025 |
| Homes by K Limited | Real estate | 2023 |
| Homes by Peach Limited | Construction | 2014 |
| Honey Wala Ltd | Agriculture & fishing | 2022 |
| Honeybeepub Ltd | Hospitality | 2024 |
| Honeymoon Aylesbury Ltd | Hospitality | 2024 |
| Hoop Heroes Franchise Holdings Ltd | Professional & scientific | 2026 |
| Hoop Heroes Region 1 Ltd | Education | 2025 |
| Hooplah Limited | Wholesale & retail | 2009 |
| Hopcroft Electrical Services Ltd | Construction | 2018 |
| Hope Specialist Healthcare Limited | Health & social care | 2015 |
| Hopelyn Properties Ltd | Real estate | 2022 |
| Hopelyn Property Stays Ltd | Hospitality | 2025 |
| Hopper and Wheatley Restorations Limited | Manufacturing | 2013 |
| Hoppers of Dinton Limited | Education | 2025 |
| Horizon Packing Company Limited | Transport & logistics | 1996 |
| Horizon Property Management Limited | Real estate | 1999 |
| Horizon Regulatory Partners Ltd | Administrative & support | 2025 |
| Horseshoe Lane Management Company Limited(The) | Real estate | 1983 |
| Horsewyse C.I.C | Education | 2009 |
| Hortus Recruitment Ltd | Administrative & support | 2025 |
| Horwood & James LLP | | 2010 |
| Horwood Trading Limited | Professional & scientific | 2024 |
| Hosanna Health Care Limited | Administrative & support | 2018 |
| Hospchild Technologies Ltd | Information & communication | 2026 |
| Hospitality Projects Ltd | Manufacturing | 2019 |
| Hotel and Management Services Ltd | Hospitality | 2019 |
| Hotkeys Property Limited | Real estate | 2016 |
| Houndsmoor Limited | Construction | 2020 |
| House Masters Music Ltd | Professional & scientific | 2023 |
| House of Darkness Ltd | Professional & scientific | 2025 |
| House of Mythras Ltd | Real estate | 2023 |
| House of Props Limited | Administrative & support | 2024 |
| House of Twenty Ltd | Wholesale & retail | 2009 |
| House of White Ltd | Real estate | 2024 |
| Housemedic Property Ltd | Real estate | 2020 |
| Howard Facilities Management Ltd | Construction | 2015 |
| HP Bamboo Limited | Hospitality | 2024 |
| HP19 Ltd | Wholesale & retail | 2016 |
| Hr&F Limited | Professional & scientific | 2025 |
| Hristov Testing Ltd | Construction | 2021 |
| Hritcan Ltd | Construction | 2014 |
| HRJ Solutions Limited | Professional & scientific | 2007 |
| HS Barbers Limited | Other services | 2021 |
| HSE Passport Limited | Extraterritorial | 2012 |
| HSH Aesthetics Limited | Extraterritorial | 2024 |
| HSK Media Limited | Professional & scientific | 2020 |
| Hstech Solutions Ltd | Other services | 2022 |
| HT Bathrooms Ltd | Construction | 2020 |
| HTN Tours Ltd | Transport & logistics | 2025 |
| Htrak Europe Limited | Extraterritorial | 2009 |
| Htrak Limited | Administrative & support | 2003 |
| Hudson Cars Ltd | Transport & logistics | 2022 |
| Hueguard Group Ltd | Wholesale & retail | 2025 |
| HUG a Leaf Ltd | Manufacturing | 2025 |
| Hugaroco Limited | Wholesale & retail | 2025 |
| Hughes IT Support Limited | Information & communication | 2009 |
| Hughes Renovations Limited | Construction | 2022 |
| Huish TV Ltd | Information & communication | 2024 |
| Hukm Development Ltd | Information & communication | 2022 |
| Human Engine Limited | Professional & scientific | 2018 |
| Human Intellect Labs Ltd | Information & communication | 2026 |
| Human Records Ltd | Information & communication | 2007 |
| Hummingbird Properties Limited | Real estate | 2014 |
| Hunch Sports Ltd | Information & communication | 2020 |
| Hungerstop Limited | Hospitality | 2025 |
| Hungry Birdz Ltd | Hospitality | 2026 |
| Hunter Insight Ltd | Professional & scientific | 2024 |
| Hunters Electrical Services Ltd | Construction | 2025 |
| Hunton Developments Ltd | Construction | 2018 |
| Hurrell Solutions Ltd | Manufacturing | 2019 |