| Hammer Galleries Limited | Arts & recreation | 1995 |
| Hammerhead Construction Ltd | Construction | 2025 |
| Hampton Bains Ltd | Administrative & support | 2013 |
| Hamrouni Property Group Limited | Real estate | 2022 |
| Hamstede Limited | Administrative & support | 2024 |
| Hanbury Financial UK Limited | Professional & scientific | 2010 |
| Hanbury Wealth Dorset Ltd | Professional & scientific | 2023 |
| Hanbury Wealth LLP | | 2010 |
| Hanbury Wealth Management Limited | Professional & scientific | 2015 |
| Hancocks Drainage & Building Supplies Limited | Wholesale & retail | 1993 |
| Hand SET Constructions Ltd | Construction | 2022 |
| Handles With Care Limited | Wholesale & retail | 1996 |
| Handmade by Hayes Limited | Extraterritorial | 2021 |
| Handsome Products Limited | Wholesale & retail | 2015 |
| Handy on the Hill Limited | Construction | 2017 |
| Handyone.Co.Uk Ltd | Other services | 2016 |
| Hanif Developments Ltd | Real estate | 2020 |
| Hank Trading Ltd | Hospitality | 2020 |
| Hannah Morris Consulting Ltd | Professional & scientific | 2020 |
| Hannah Williams PR Ltd | Information & communication | 2018 |
| Hanson Search Limited | Administrative & support | 2000 |
| Hanuman Media Ltd | Financial services | 2018 |
| Haph Ltd | Construction | 2025 |
| Happy Childhood Ltd | Education | 2017 |
| Harborstone Property Ltd | Hospitality | 2025 |
| Harbory Ltd | Real estate | 2026 |
| Hard to Reach Ltd | Health & social care | 2023 |
| Hardiman Management Ltd | Administrative & support | 2014 |
| Harefield Pharma Associates Limited | Professional & scientific | 1994 |
| Hari Ramachandran Ltd | Health & social care | 2017 |
| Harini Hospitality Ltd | Hospitality | 2024 |
| Hariom Mobile Limited | Wholesale & retail | 2021 |
| Harley Connect Healthcare Ltd | Health & social care | 2011 |
| Harmonear Ltd | Wholesale & retail | 2023 |
| Harmonis Ltd | Professional & scientific | 2025 |
| Harper Cottages Limited | Households | 1994 |
| Harper Wood Consulting Limited | Professional & scientific | 2020 |
| Harper Wood Developments Limited | Construction | 2022 |
| Harper Wood Langcroft Ltd | Construction | 2005 |
| Harperwood Homes Ltd | Construction | 2018 |
| Harri Payroll (UK) Limited | Professional & scientific | 2019 |
| Harri Technologies (UK) Limited | Administrative & support | 2015 |
| Harrimis Limited | Real estate | 2019 |
| Harrington (EN5) RTM Company Limited | Households | 2024 |
| Harris & Bains Commercial Ltd | Wholesale & retail | 2020 |
| Harris & Bains Investments Ltd | Wholesale & retail | 2016 |
| Harris & Bains Ltd | Administrative & support | 2016 |
| Harris & Bains Properties Ltd | Wholesale & retail | 2020 |
| Harris Bains Limited | Professional & scientific | 2014 |
| Harris Geomatics Ltd | Professional & scientific | 2021 |
| Harrison Electrical 24/7 Ltd | Construction | 2026 |
| Harrow Properties Signs Limited | Administrative & support | 2023 |
| Harry Durham Construction Ltd | Construction | 2019 |
| Harry's Event Catering Company Limited | Hospitality | 2025 |
| Hart Tree Surgeons Limited | Administrative & support | 2006 |
| Harte Civil Engineering Ltd | Construction | 2018 |
| Hartfield Legal Ltd | Professional & scientific | 2012 |
| Harvesters Cafe Ltd | Hospitality | 2026 |
| Harvey Johansson Ltd | Wholesale & retail | 2014 |
| Harvey Metcalfe Ltd | Real estate | 2024 |
| HAS Innovation Ltd | Information & communication | 2020 |
| Hasan Numan Ltd | Extraterritorial | 2023 |
| Hasfb Ltd | Health & social care | 2024 |
| Hasl Holdings Ltd | Financial services | 2019 |
| Haslemere 15 Ltd | Financial services | 2025 |
| Hasnam Investments Limited | Real estate | 1984 |
| Hass Foods Ltd | Manufacturing | 2009 |
| Hassbross Autos Ltd | Wholesale & retail | 2021 |
| Hassell Free Mgmt Ltd | Professional & scientific | 2025 |
| Hassop Equity Ltd | Real estate | 2023 |
| Hastingwood Estates Limited | Real estate | 1985 |
| Haston International Limited | Information & communication | 1985 |
| HAT 656 Limited | Wholesale & retail | 2002 |
| Hatched Projects Limited | Construction | 2018 |
| Hatmo Ltd | Real estate | 2019 |
| Hatrix Ltd. | Wholesale & retail | 2012 |
| Hatzola HBS Limited | Health & social care | 2023 |
| Hause of LP Limited | Other services | 2023 |
| Haversham Investments Ltd | Real estate | 2016 |
| Hawkstone Global Software Solutions UK Limited | Administrative & support | 2026 |
| HAY Business Service (U.K.) Co. Ltd | Wholesale & retail | 2018 |
| Hayden Investments Limited | Real estate | 2017 |
| Haydyn Hope Heating & Plumbing Limited | Construction | 2009 |
| Hayhouse Coalmine Ltd | Health & social care | 2017 |
| Haymar Consulting Limited | Professional & scientific | 1998 |
| Haywood-Roberts Limited | Professional & scientific | 1992 |
| HAZ Ventures Ltd | Real estate | 2021 |
| Hazel Lakes Limited | Hospitality | 2020 |
| Hazel Music Limited | Information & communication | 2012 |
| Hazel Nail and Beauty Ltd | Other services | 2026 |
| Hazelwood 2014 Limited | Real estate | 2014 |
| Hazelwood Pharma Law Services Limited | Administrative & support | 2015 |
| Hazey Jane Films Ltd | Information & communication | 2016 |
| HB Brick&Block Ltd | Construction | 2024 |
| HBC (2015) Limited | Construction | 2015 |
| HBD Construction Limited | Construction | 2024 |
| HBF Investments Ltd | Real estate | 2022 |
| Hbll Limited | Manufacturing | 1924 |
| HBS Accountancy Limited | Professional & scientific | 2016 |
| HC Property Investments Limited | Real estate | 2016 |