| H2N Management Ltd | Professional & scientific | 2018 |
| H2O Bathroom Solutions Ltd | Wholesale & retail | 2009 |
| H2O Nails & Beauty Ltd | Other services | 2023 |
| H2O Nails Ltd | Other services | 2025 |
| H2O Property Solutions Ltd | Real estate | 2019 |
| H2OMES Plumbing and Heating Ltd | Construction | 2024 |
| H2Y Limited | Administrative & support | 2007 |
| H4 Barbers Limited | Other services | 2019 |
| H9 Living Limited | Real estate | 2025 |
| HA Authentic Foods Ltd | Hospitality | 2025 |
| HA HA Festivals Limited | Wholesale & retail | 2019 |
| HA HA Promotions Limited | Wholesale & retail | 2018 |
| HA Property Limited | Real estate | 2006 |
| HA Solutions Sheff Ltd | Administrative & support | 2025 |
| HA Telecoms Ltd | Other services | 2017 |
| HAA Property Management Ltd | Real estate | 2026 |
| HAA Samad Bangladesh Ltd | Extraterritorial | 2009 |
| Haarkon Limited | Information & communication | 2021 |
| Haay Consulting Ltd | Information & communication | 2025 |
| Habeebkay Ltd | Other services | 2026 |
| Habibi Mini Market Limited | Wholesale & retail | 2025 |
| Habibi Shawarma S4 Ltd | Hospitality | 2026 |
| Habtom Ltd | Transport & logistics | 2025 |
| HAC Catering (2020) Limited | Hospitality | 2019 |
| Hach Logistics Ltd | Transport & logistics | 2025 |
| Hackenthorpe FC Ltd | Arts & recreation | 2024 |
| Hackett Physio Ltd | Health & social care | 2015 |
| Hacking Hill Event Catering Limited | Hospitality | 2017 |
| HAD Corporation Limited | Professional & scientific | 2023 |
| HAD Property Limited | Construction | 2021 |
| Haddad Inc Ltd | Wholesale & retail | 2021 |
| Haddi Mortgages Limited | Financial services | 2022 |
| Hadee Engineering (2023) Co Ltd | Manufacturing | 1980 |
| Hadee Engineering Co. Ltd | Manufacturing | 1971 |
| Hadee EOT Limited | Extraterritorial | 2026 |
| Hadengrove LLP | | 2011 |
| Hadenpark Limited | Real estate | 1994 |
| Hadfield Architecture Ltd | Professional & scientific | 2019 |
| Hadfield Catering Butchers Limited | Wholesale & retail | 1997 |
| Hadfield Cawkwell Davidson Limited | Professional & scientific | 2007 |
| Hadfield Property Management Ltd | Real estate | 2024 |
| Hadgu Properties Limited | Real estate | 2023 |
| Hadi Housing Group Ltd | Real estate | 2026 |
| Hadi Karir Ltd | Health & social care | 2023 |
| Hadison Ltd | Wholesale & retail | 2017 |
| Hadwellhalfric Ltd | Wholesale & retail | 2026 |
| Haelo (UK) Ltd | Arts & recreation | 2013 |
| HAF Logistics Ltd | Transport & logistics | 2024 |
| HAF Powertools Limited | Wholesale & retail | 1994 |
| Hafez Language School C.I.C. | Education | 2024 |
| Hafman Limited | Professional & scientific | 2021 |
| Hafsa Trade Ltd | Wholesale & retail | 2024 |
| Hagglers Corner Limited | Administrative & support | 2013 |
| Hagglers Events Ltd | Hospitality | 2013 |
| Haggstones Heating Ltd | Construction | 2024 |
| Hague & Turner Supplies Ltd | Wholesale & retail | 2022 |
| Hague Farming Limited | Agriculture & fishing | 1988 |
| Hague Haulage Limited | Transport & logistics | 2019 |
| Hague Mechanical Engineering Services Ltd | Manufacturing | 2024 |
| Hague Plant Limited | Construction | 1975 |
| Hague UK Holdings Limited | Financial services | 2026 |
| Hague Yorkshire Limited | Financial services | 2022 |
| Hagues Garage Services Ltd | Extraterritorial | 2006 |
| HAH Innovation Limited | Wholesale & retail | 2025 |
| HAI NAM Ltd | Real estate | 2025 |
| Haibus Limited | Real estate | 2003 |
| Haidari Tours Ltd | Administrative & support | 2022 |
| Haiderium Property Limited | Real estate | 2025 |
| Hair & Beauty Lounge Enterprises Ltd | Other services | 2021 |
| Hair (SY) Limited | Other services | 2017 |
| Hair Analysis Report Ltd | Information & communication | 2024 |
| Hair Bebe Limited | Other services | 2018 |
| Hair by Cynthia Ltd | Other services | 2023 |
| Hair by Elfin Ltd | Other services | 2003 |
| Hair by HCM Limited | Other services | 2018 |
| Hair by Kaya Ltd | Other services | 2020 |
| Hair Healers Salon Ltd | Other services | 2026 |
| Hair Hub Ltd | Other services | 2012 |
| Hair Hypermarket Limited | Other services | 2016 |
| Hair Q Ltd | Health & social care | 2026 |
| Hair Union Sheffield Ltd | Other services | 2009 |
| Hairdresser Ltd | Wholesale & retail | 2025 |
| Hairlines Ltd | Other services | 2018 |
| Hairy Hounds Dog Grooming Salon Limited | Professional & scientific | 2014 |
| Hajdecoration Limited | Construction | 2025 |
| Hajj Holdings Limited | Administrative & support | 2024 |
| Hajj Travellers Ltd | Construction | 2020 |
| HAK Core Solutions Limited | Administrative & support | 2025 |
| HAK Demi Ltd | Hospitality | 2019 |
| HAK Trade Ltd | Wholesale & retail | 2024 |
| HAL Morganson Limited | Real estate | 2007 |
| Hala Falafel Ltd | Hospitality | 2024 |
| Halan Grocers Ltd | Wholesale & retail | 2025 |
| Halation Effect Ltd | Professional & scientific | 2011 |
| Halbyrd Furniture Limited | Wholesale & retail | 1997 |
| Halcyon Abode Ltd | Professional & scientific | 2010 |
| Halcyon Daze Limited | Hospitality | 2016 |
| Halcyon Driving School Ltd | Education | 2021 |
| Halcyon Hallamshire Limited | Hospitality | 2023 |
| Halcyon Residential Limited | Real estate | 2004 |