| H&S Construction LIM Limited | Construction | 2025 |
| H&W Arboricultural Specialists Limited | Agriculture & fishing | 2017 |
| H&Y Projects Ltd | Construction | 2026 |
| H. & M. Construction (Doncaster) Limited | Construction | 1987 |
| H. L. C. Engineering Services Limited | Manufacturing | 1995 |
| H. Mell & SON (Services) Ltd. | Professional & scientific | 1985 |
| H. Wilson Commercial Limited | Wholesale & retail | 1996 |
| H.A Driver Training Ltd | Education | 2026 |
| H.A.I Logistics Ltd | Transport & logistics | 2017 |
| H.E. Brinkley Limited | Construction | 1976 |
| H.I.Weldrick Limited | Wholesale & retail | 1959 |
| H.L. Brown & SON Limited | Wholesale & retail | 1910 |
| H.L.B.Properties Limited | Real estate | 1959 |
| H.S.N. Partnership (UK) Limited | Professional & scientific | 2008 |
| H2 Portes 1 Limited | Manufacturing | 2017 |
| H2 Portes 2 Limited | Manufacturing | 2017 |
| H2 Portes Topco Limited | Extraterritorial | 2017 |
| H20 Solar (Engineering) Limited | Construction | 2008 |
| H21 DEV Ltd | Financial services | 2025 |
| H4 Group Limited | Water & waste | 2019 |
| HA VY Nails Ltd | Other services | 2023 |
| Haa-Dja Limited | Administrative & support | 2008 |
| Haas Real Estate Ltd | Real estate | 2026 |
| Habia | Administrative & support | 1998 |
| Habinet Ltd | Real estate | 2024 |
| Habodel 2 Limited | Real estate | 2013 |
| Habodel 3 Limited | Real estate | 2013 |
| Habodel 5 Limited | Real estate | 2013 |
| Habodel 7 Limited | Real estate | 2014 |
| Habodel 8 Limited | Real estate | 2016 |
| Habodel Property Services Limited | Financial services | 2022 |
| Habs Homes Ltd | Real estate | 2020 |
| Hackerstem Ltd | Education | 2023 |
| Hackett Flooring Ltd | Construction | 2025 |
| Hacky Holdings Limited | Financial services | 2023 |
| Hadi Pharm Ltd | Health & social care | 2013 |
| Hado Estates Ltd | Real estate | 2014 |
| Hadrian (Residential) Limited | Real estate | 2014 |
| Hadrian Developments Ltd | Financial services | 2019 |
| Hadrian ST Albans Ltd | Real estate | 2024 |
| Hadtap Holdings Ltd | Financial services | 2026 |
| Haggart Ltd | Financial services | 2025 |
| Haggertys Essentials Ltd | Wholesale & retail | 2020 |
| Haidre Ltd | Extraterritorial | 2021 |
| Haigh Accountants Holdings Limited | Financial services | 2025 |
| Haigh Accountants Limited | Professional & scientific | 2010 |
| Haigh Farming LLP | | 2010 |
| Haigh Properties Yorkshire Limited | Real estate | 2015 |
| Hail Care and Consultancy Limited | Professional & scientific | 2025 |
| Hail Pro Ltd | Wholesale & retail | 2025 |
| Hain Logistic Limited | Transport & logistics | 2019 |
| Hair and Scalp Care Ltd | Other services | 2025 |
| Hair Drying Solutions Limited | Wholesale & retail | 2016 |
| Hair Fantastic Retail Limited | Wholesale & retail | 2012 |
| Hair Loss Clinic Inc Limited | Health & social care | 2026 |
| Hairzone (Doncaster) Limited | Other services | 2003 |
| Haitch Homes Ltd | Construction | 2026 |
| Haith Engineers Limited | Professional & scientific | 1964 |
| Haith Group Limited | Financial services | 2015 |
| Haith-Np Limited | Health & social care | 2016 |
| Haiv Limited | Wholesale & retail | 2025 |
| Hakk Properties Ltd | Real estate | 2025 |
| HAL Energy Ltd | Manufacturing | 2020 |
| Halal Meat Store Ltd | Manufacturing | 2012 |
| Halcyon Forge Ltd | Administrative & support | 2025 |
| Halcyon Works Limited | Extraterritorial | 2026 |
| HALE67 Limited | Hospitality | 2025 |
| Hall Cross Tax Consultancy Limited | Professional & scientific | 1990 |
| Hall Farm Transport Limited | Transport & logistics | 2019 |
| Hall Fencing Limited | Construction | 2006 |
| Hall Grove Developments Ltd | Construction | 2024 |
| Hall-Brooks Properties Ltd | Real estate | 2023 |
| Hallam Yellow Rose Limited | Transport & logistics | 2024 |
| Halldale Properties Limited | Construction | 2006 |
| Hallmark Developments (Yorkshire) Limited | Construction | 2024 |
| Hallmark Mortgages Limited | Financial services | 2012 |
| Hallmark TM Ltd | Other services | 2024 |
| Hallowed Ventures Limited | Professional & scientific | 2012 |
| Hallplant Services Limited | Manufacturing | 2022 |
| Halsey Advisory Limited | Other services | 2025 |
| Halton 5 Management Company Limited | Real estate | 2024 |
| Halton 5 Property Management Company Limited | Households | 2024 |
| Haltrix Ltd | Wholesale & retail | 2026 |
| Hamari Ltd | Real estate | 2021 |
| Hamilton Lodge Management Company Limited | Real estate | 2005 |
| Hamlin Homes (Yorkshire) Limited | Construction | 2004 |
| Hamlin Homes Limited | Construction | 2002 |
| Hamlingtons Ltd | Wholesale & retail | 2010 |
| Hammers TM Ltd | Public administration | 2024 |
| Hampstead Court Residents Management Company Limited | Households | 2021 |
| Hampton (29) Limited | Health & social care | 2015 |
| Hamshaw Associates Limited | Professional & scientific | 2011 |
| Hamster Companies Ltd | Financial services | 2015 |
| HAN Estate Limited | Real estate | 2024 |
| Hancock Fencing Limited | Construction | 2017 |
| Hand in Hand Care Ltd | Public administration | 2025 |
| Handbrake Ltd | Wholesale & retail | 2025 |
| Handmade With Care by Matthew Thomas Palmer Ltd | Manufacturing | 2025 |
| Handy Craft Shop Ltd | Wholesale & retail | 2025 |
| Handyman John Ltd | Construction | 2025 |