| H&T Bars Ltd | Hospitality | 2024 |
| H&W Team Ltd | Administrative & support | 2019 |
| H&Y Hirani Properties Ltd | Real estate | 2026 |
| H. F. O. Technical Services Limited | Administrative & support | 2014 |
| H.Adam Limited | Information & communication | 2025 |
| H.Bros Recovery&Logistics Ltd | Transport & logistics | 2024 |
| H.D.M.C. (Conferencing) Limited | Extraterritorial | 2001 |
| H.L. Sheldon Limited | | 1953 |
| H.P.M.C. Limited | Professional & scientific | 2000 |
| H.R. Accountancy Services Limited | Professional & scientific | 1994 |
| H100 Consulting Limited | Professional & scientific | 2024 |
| H21O Limited | Water & waste | 2023 |
| H2A Systems Ltd | Administrative & support | 2024 |
| H2A2 Properties Limited | Real estate | 2023 |
| H3B UK Ltd | Wholesale & retail | 2024 |
| H7N Ltd | Real estate | 2019 |
| HA GIA Ltd | Other services | 2023 |
| HA Horizon Services Limited | Health & social care | 2023 |
| HA Trading & Logistics Ltd | Wholesale & retail | 2025 |
| Ha.Fba Ltd | Wholesale & retail | 2026 |
| HA1 Carpentry Ltd | Construction | 2013 |
| HA1 Construction Ltd | Construction | 2025 |
| HA2 Dental Ltd | Health & social care | 2026 |
| HA5 Residents Limited | Households | 2020 |
| HAA Diagnostics Ltd | Health & social care | 2023 |
| Haadi Investments Limited | Real estate | 2014 |
| Haaginteriors Limited | Manufacturing | 2017 |
| Haap Healthcare Ltd | Health & social care | 2026 |
| Haaya Ltd | Information & communication | 2023 |
| Habau Ltd | Construction | 2024 |
| Habayeb Limited | Financial services | 2021 |
| Habibi Interpreting and Translation Limited | Professional & scientific | 2011 |
| Habibi Interpreting and Translation Services Ltd | Professional & scientific | 2025 |
| Habibi on the Hill Limited | Hospitality | 2026 |
| Habiscus Property Limited | Real estate | 2016 |
| Habitat Design & Build Ltd | Construction | 2020 |
| Habitect Ltd | Information & communication | 2025 |
| Hacemos Limited | Professional & scientific | 2006 |
| Hadamin Limited | Professional & scientific | 2025 |
| Hadasa Limited | Construction | 2017 |
| Haddenham Flats Limited | Households | 1997 |
| Hadi Gallery Limited | Wholesale & retail | 2018 |
| Haemonetics Asia UK Ltd | Administrative & support | 2012 |
| Haemonetics Limited | Wholesale & retail | 1975 |
| Haffurd Consulting Limited | Professional & scientific | 2017 |
| Hafiza Foundation | Other services | 2025 |
| HAI TE ARK Trading Limited | Wholesale & retail | 2019 |
| Haider Assets Ltd | Real estate | 2024 |
| Haider Property Management Limited | Real estate | 2018 |
| Haile Consulting Ltd | Professional & scientific | 2026 |
| Haines and Robinson Holdings Ltd | Real estate | 2025 |
| Hair Brained Holdings Limited | Manufacturing | 2021 |
| Hair by ME Ltd | Other services | 2025 |
| Hair Company Harrow Ltd | Other services | 2015 |
| Hair Design Studio London Ltd | Other services | 2020 |
| Hair Growth Centre Leeds Limited | Health & social care | 2021 |
| Hair With TLC Limited | Other services | 2018 |
| Haircules Wholesale Limited | Other services | 2022 |
| Hairgrowthcentre Birmingham Ltd | Health & social care | 2020 |
| Hairgrowthcentresurgery Limited | Health & social care | 2020 |
| Hairgrowthcentresurrey Limited | Health & social care | 2020 |
| Hairstyle & Beauty Ltd | Other services | 2007 |
| HAJ M Ltd | Construction | 2014 |
| Hajer Properties Ltd | Real estate | 2019 |
| HAK & Co UK Ltd | Manufacturing | 2025 |
| Hakasa Ltd | Health & social care | 2023 |
| Hakka Eateries Ltd | Hospitality | 2022 |
| HAL Group Holdings Ltd | Administrative & support | 2018 |
| Halai K Limited | Professional & scientific | 2014 |
| Halai Plumbing Limited | Construction | 2011 |
| Halal Deals Ltd | Administrative & support | 2026 |
| Halal Food Farmacy Ltd | Manufacturing | 2017 |
| Hale International(Uk) Limited | Wholesale & retail | 2009 |
| Hale Lane Residents Company Limited | Households | 2004 |
| Halebop Ltd | Administrative & support | 2014 |
| Halesford Limited | Construction | 2015 |
| Halestone Limited | Real estate | 2013 |
| Half Moon Entertainments Ltd | Professional & scientific | 2026 |
| Half Moon One Ltd | Real estate | 2024 |
| Halfacre Developments Limited | Construction | 2006 |
| Halford Place Management Limited | Real estate | 2015 |
| Halifax Estate Agents Ltd | Real estate | 2014 |
| Haliti Recruitment Ltd | Administrative & support | 2026 |
| Hall James Limited | Administrative & support | 2006 |
| Hallam Student Investments Limited | Construction | 2015 |
| Halland & Spring Consultants Limited | Financial services | 2015 |
| Halland Limited | Real estate | 2020 |
| Halley Medical Supplies Limited | Professional & scientific | 2003 |
| Halli & Shah Limited | Manufacturing | 2021 |
| Hallow Media Limited | Information & communication | 2023 |
| Hallowell Place Limited | Households | 2017 |
| Halo IS Productions Limited | Information & communication | 2014 |
| Halsall Homes Limited | Construction | 1999 |
| Halsall Travel International Ltd | Administrative & support | 2018 |
| Halyards Medical Ltd | Health & social care | 2026 |
| Halymaz Trading Ltd | Financial services | 2018 |
| Hamareraah Ltd | Wholesale & retail | 2025 |
| Hamberley Investments Ltd | Professional & scientific | 2022 |
| Hambledon Hall Farm Limited | Agriculture & fishing | 2024 |
| Hamhill Store Ltd | Wholesale & retail | 2026 |