| Hairouna Ltd | Wholesale & retail | 2025 |
| Hairvo Ltd | Other services | 2026 |
| Hakuba Green Ltd | Real estate | 2022 |
| Hale Ducting Ltd | Professional & scientific | 2022 |
| Hale Partnership Limited | Financial services | 2001 |
| Hale Secretarial Limited | Administrative & support | 2002 |
| Hall Barn Estates Limited | Other services | 1996 |
| Hall Insurance Services Limited | Financial services | 1983 |
| Halls Landscape Construction Ltd | Construction | 2022 |
| Halo 2018 Limited | Financial services | 2018 |
| Halo 360 Enterprises Ltd | Wholesale & retail | 2019 |
| Halo Beauty Salon Ltd | Administrative & support | 2025 |
| Halo Home Improvements Limited | Construction | 2004 |
| Haloss Limited | Manufacturing | 2022 |
| Hamble Hearth Ltd | Arts & recreation | 2023 |
| Hambledon Farms Ltd | Financial services | 2023 |
| Hamden Homes Limited | Construction | 1995 |
| Hamesy Plastering & Building Ltd | Construction | 2026 |
| Hamilton Academy | Education | 2012 |
| Hamilton Frazer Ltd | Professional & scientific | 2024 |
| Hamme Construction Limited | Extraterritorial | 1995 |
| Hammond Construction (Oxford) Limited | Construction | 2007 |
| Hammond Electrical (South) Limited | Construction | 2022 |
| Hammond Residential Solutions Ltd | Real estate | 2023 |
| Hampal Consultancy Limited | Professional & scientific | 2025 |
| Hampden Bottom Farm Limited | Agriculture & fishing | 2009 |
| Hampden Court (Gerrards Cross) Freeholders Limited | Households | 2019 |
| Hampercraft Ltd | Wholesale & retail | 2018 |
| Hamptons GX Ltd | Transport & logistics | 2011 |
| Hamsterzorb Berkshire Ltd | Arts & recreation | 2018 |
| Hamzasultani Ltd | Wholesale & retail | 2025 |
| Hancock Developments Limited | Construction | 2019 |
| Hancock Property Services Ltd | Construction | 2025 |
| Handedly Ltd | Extraterritorial | 2024 |
| Handover Clean Ltd | Administrative & support | 2026 |
| Handyman Services Team Ltd | Construction | 2016 |
| Hanger Lane Holdings Limited | Extraterritorial | 1968 |
| Hangul Global Ltd | Wholesale & retail | 2026 |
| Hanif Healthcare Limited | Wholesale & retail | 2019 |
| Hannam Consulting Limited | Professional & scientific | 2020 |
| Hanomi Limited | Professional & scientific | 2023 |
| Hansen Kevin Patterson Centre Ltd | Wholesale & retail | 2024 |
| Hansford Sensors Limited | Manufacturing | 2006 |
| Hansons Chauffeuring Ltd | Transport & logistics | 2024 |
| Hanwell Fields 3B Management Company Limited | Extraterritorial | 2005 |
| HAO CHI Panda Halal Chinese Ltd | Hospitality | 2026 |
| HAP Chartered Architects Limited | Professional & scientific | 2003 |
| Happy TAI PAN Limited | Hospitality | 2024 |
| Happy Tummy 121 Limited | Hospitality | 2020 |
| Happydayscleaning Ltd | Administrative & support | 2025 |
| Harcourt Gardens Management RTM Company Ltd | Households | 2010 |
| Harglo Property Management Limited | Other services | 2024 |
| Harina Fruit & VEG Ltd | Wholesale & retail | 2024 |
| Harini Services Ltd | Wholesale & retail | 2025 |
| Haris Properties HW Ltd | Real estate | 2022 |
| Haritna Limited | Hospitality | 2017 |
| Harkbuzz Ltd | Wholesale & retail | 2023 |
| Harlequin Travel (UK) Limited | Transport & logistics | 2013 |
| Harley Towler Consultancy Ltd | Professional & scientific | 2023 |
| Harley Wapshare Associates Ltd. | Construction | 2015 |
| Harleybeck Limited | Households | 1985 |
| Harling & Kirk Accountants Limited | Professional & scientific | 2024 |
| Harmer Safety Consulting Ltd | Professional & scientific | 2024 |
| Harmon Parts Ltd | Wholesale & retail | 2024 |
| Harmony House Furnishers Limited | Wholesale & retail | 1996 |
| Harmony Tree Ltd | Information & communication | 2022 |
| Harnikk Ltd | Wholesale & retail | 2025 |
| Harriott Catering Ltd | Hospitality | 2024 |
| Harris Magee Limited | Information & communication | 2009 |
| Harrison Finley Limited | Real estate | 2019 |
| Harrow Collection Ltd | Manufacturing | 2025 |
| Harry Plotter Limited | Construction | 2024 |
| Hart Sound & Air Testing Ltd | Professional & scientific | 2024 |
| Harvest Hill (Bourne END) Residents' Association Limited | Households | 1992 |
| Harvest Landscapes Ltd | Administrative & support | 2024 |
| Harveys Electrical Limited | Extraterritorial | 2017 |
| Harveys Mechanical Limited | Construction | 2017 |
| Harvsonia Holdings Ltd | Real estate | 2020 |
| Harwoods Electrical Limited | Construction | 2020 |
| Hasach Ltd | Wholesale & retail | 2025 |
| Haslam Consulting Ltd | Information & communication | 2023 |
| Haslam Logistics Ltd | Transport & logistics | 2018 |
| Hassall Homes (Cheshire) Limited | Extraterritorial | 1972 |
| Hassall Homes (Mercia) Limited | Extraterritorial | 1985 |
| Hassall Homes (Southern) Limited | Extraterritorial | 1950 |
| Hassall Homes (Wessex) Limited | Extraterritorial | 1957 |
| Hassan Trading UK Limited | Wholesale & retail | 2017 |
| Hasuka Automation Ltd | Manufacturing | 2024 |
| HAT Topco Limited | Professional & scientific | 2026 |
| Hatchcopse Holdings Limited | Financial services | 2018 |
| Hatters Lane (204-210) Associates RTE Limited | Professional & scientific | 2007 |
| Haus of Pilates LDN Ltd | Arts & recreation | 2023 |
| Havarc Ltd | Administrative & support | 2024 |
| Haven Heights Limited | Real estate | 2024 |
| Havenhill ZUH Ltd | Health & social care | 2025 |
| Havenley UK Ltd | Construction | 2021 |
| Haverhill Developments Limited | Real estate | 2007 |
| Hawes Holdings Limited | Administrative & support | 2009 |
| Hawes Plant and Tool Hire Limited | Construction | 1986 |
| Hawes Skip Hire Limited | Water & waste | 2008 |