| Harelaw Industrial Estate Ltd | Real estate | 2021 |
| Hargof Limited | Hospitality | 2020 |
| Hargreaves (UK) Limited | Transport & logistics | 2001 |
| Hargreaves Carbon Products Europe Limited | Extraterritorial | 2012 |
| Hargreaves Corporate Director Limited | Administrative & support | 2018 |
| Hargreaves Environmental Services Limited | Water & waste | 2024 |
| Hargreaves Hemingfield Ltd | Professional & scientific | 2023 |
| Hargreaves Land (North) Limited | Financial services | 2005 |
| Hargreaves Land (South) Limited | Real estate | 2003 |
| Hargreaves Land Group Limited | Real estate | 2023 |
| Hargreaves Land Holdings Limited | Financial services | 2019 |
| Hargreaves Land Limited | Real estate | 2011 |
| Hargreaves LD Limited | Real estate | 2023 |
| Hargreaves Maltby Limited | Real estate | 2012 |
| Hargreaves Pension Company Limited | Professional & scientific | 2017 |
| Hargreaves Property Ventures Limited | Real estate | 2017 |
| Hargreaves Services (Blindwells) Limited | Real estate | 2013 |
| Hargreaves Services (Westfield) Limited | Real estate | 2013 |
| Hargreaves Services Europe Limited | Other services | 2011 |
| Hargreaves Services Forestry Limited | Real estate | 2013 |
| Hargreaves Services PLC | Professional & scientific | 2003 |
| Hargreaves Trading Limited | Wholesale & retail | 2026 |
| Hargreaves Waste Management Services Limited | Water & waste | 2024 |
| Hargreaves Wilsden Ltd | Professional & scientific | 2023 |
| Hargreaves Zinc Processing Limited | Professional & scientific | 2024 |
| Harlyn Barton Management Limited | Households | 1986 |
| Harness Accounting Limited | Professional & scientific | 2016 |
| Harrier Fuels Ltd. | Energy | 1993 |
| Harringtons Sales and Lettings Limited | Real estate | 2009 |
| Harrison Education Insights Consultancy Limited | Professional & scientific | 2022 |
| Harrison Hair & Beauty Ltd | Other services | 2018 |
| Harrison Holdings & Investments Limited | Financial services | 2018 |
| Harrison Property and Investments Ltd | Real estate | 2021 |
| Harrison Spratt Developments Ltd | Construction | 2024 |
| Harrogate Coins Ltd | Wholesale & retail | 2025 |
| Hart Properties and Developments Ltd | Real estate | 2006 |
| Hartley Bird Limited | Real estate | 2023 |
| Harvies of Edinburgh Limited | Wholesale & retail | 2002 |
| Hasan KIS Ltd | Wholesale & retail | 2025 |
| Haswell and District Mencap | Other services | 2005 |
| Hatch Growth Ltd | Information & communication | 2026 |
| Haus of Aesthetica Ltd | Other services | 2023 |
| Havok Bike Park CIC | Arts & recreation | 2023 |
| Hawar Aroma Pizza Ltd | Hospitality | 2024 |
| Hawk & Atlantik Ltd | Wholesale & retail | 2024 |
| Hawks Culinary Ltd | Hospitality | 2019 |
| Hawthorn Blue Ltd | Administrative & support | 2012 |
| Hayhoe Offshore Limited | Energy | 2021 |
| Hayley Adelaide Ltd | Real estate | 2025 |
| Hayley UY Khanh Ltd | Real estate | 2023 |
| Hazelbrook Specialist Care at Home Limited | Health & social care | 2012 |
| Hazmor Investments Limited | Real estate | 2019 |
| HBR Limited | Construction | 2001 |
| HC Construction (North East) Ltd | Construction | 2021 |
| HC Conveyors Limited | Wholesale & retail | 2023 |
| HC Travel Solutions Ltd | Transport & logistics | 2024 |
| HDD Drilling Supply Services Limited | Other services | 2015 |
| HDY Logistics Ltd | Transport & logistics | 2024 |
| HE Contracts Limited | Manufacturing | 1998 |
| HEA Projects Ltd | Real estate | 2025 |
| Head in the Cloud Solutions Limited | Information & communication | 2021 |
| Heads UP Scaffolding Limited | Construction | 2025 |
| Headway Wealth Ltd | Professional & scientific | 2019 |
| Health Box Nutrition (NE) Limited | Hospitality | 2019 |
| Heart and Home Community Services CIC | Education | 2026 |
| Heart of the Home Cleaning Limited | Administrative & support | 2024 |
| Heating England Limited | Professional & scientific | 2011 |
| Heavyweight Group Ltd | Financial services | 2026 |
| Hebden Activewear Limited | Wholesale & retail | 2018 |
| Hegamonia Ltd | Wholesale & retail | 2025 |
| Heighington JV Limited | Construction | 2016 |
| Heist Store Ltd | Wholesale & retail | 2021 |
| Helen Cooksley Ltd | Professional & scientific | 2023 |
| Helios Estates Limited | Real estate | 2024 |
| Helios Living (Walthamstow) Limited | Construction | 2022 |
| Helios Logistics (Wynyard) Limited | Construction | 2020 |
| Helios Property Holdings Limited | Construction | 2010 |
| Helios Real Estate Limited | Construction | 2012 |
| Hello Baby Store Limited | Wholesale & retail | 2023 |
| Help @ Hand (Durham) Limited | Administrative & support | 2022 |
| Helrazors Limited | Professional & scientific | 2016 |
| Hemp Garden Community Association CIC | Health & social care | 2024 |
| Henderson Limited | Extraterritorial | 2003 |
| Hendleigh Estates Ltd | Real estate | 2024 |
| Henhousefc Limited | Hospitality | 2024 |
| Henry Elizabeth Rentals Limited | Real estate | 2021 |
| Henry Rupert Holdings Ltd | Real estate | 2022 |
| Henry's Fish Bar Limited | Hospitality | 2025 |
| Henry's Fish Shack Ltd | Hospitality | 2025 |
| Henshaw & Henshaw Ltd | Energy | 2008 |
| Heritage 100 Walks CIC | Health & social care | 2025 |
| Heritage Star Foods Limited | Wholesale & retail | 2025 |
| Hero Healthcare Limited | Professional & scientific | 2013 |
| Heron Television Limited | Information & communication | 2013 |
| Herwood Estates Limited | Real estate | 2017 |
| Hesler Automation Limited | Construction | 2023 |
| Hestia Store Ltd | Wholesale & retail | 2026 |
| Hexifydot Limited | Information & communication | 2026 |
| HFR Holding Company Limited | Financial services | 2022 |
| HFR Paving Ltd | Construction | 2024 |