| Harmonify Care Ltd | Health & social care | 2026 |
| Harmony Homes and Rooms Ltd | Real estate | 2016 |
| Harmony Living Ltd | Wholesale & retail | 2020 |
| Harmony Music School Limited | Education | 2012 |
| Harnwell Electrical Limited | Construction | 2007 |
| Harold Moore Limited | Manufacturing | 1978 |
| Harold Moore Products Limited | Extraterritorial | 1996 |
| Harp Property Investments Limited | Real estate | 2009 |
| Harp Security Solutions Ltd | Administrative & support | 2026 |
| Harper Beds Limited | Manufacturing | 2023 |
| Harper Clinical Partners Ltd | Health & social care | 2017 |
| Harper Edwards Recruitment Ltd | Administrative & support | 2023 |
| Harper Rose Management Limited | Professional & scientific | 2015 |
| Harper Rose Tanning Limited | Other services | 2026 |
| Harpetzoon Ltd | Hospitality | 2020 |
| Harptech Ltd | Wholesale & retail | 2026 |
| Harriet and Zachary Ltd | Real estate | 2020 |
| Harriet Eccleston Ltd | Professional & scientific | 2024 |
| Harriet Wingfield Ltd | Transport & logistics | 2019 |
| Harrington & Clark Limited | Administrative & support | 2018 |
| Harris & Sons Properties Ltd | Real estate | 2026 |
| Harris Akbar Limited | Arts & recreation | 2024 |
| Harris Dental Laboratory Ltd | Health & social care | 2013 |
| Harris Interiors Ltd | Construction | 2024 |
| Harris Plastering and Handyman Services Ltd | Construction | 2016 |
| Harrison a Homes Limited | Real estate | 2021 |
| Harrison Access Ltd | Construction | 2025 |
| Harrison Decorators Limited | Construction | 2006 |
| Harrison Fisher & Co. Limited | Manufacturing | 1897 |
| Harrison Total Property Ltd | Construction | 2016 |
| Harrison's Signs & Graphics Limited | Extraterritorial | 2023 |
| Harrodson Motor Group Ltd | Wholesale & retail | 2025 |
| Harrop Hotels Ltd | Hospitality | 2010 |
| Harrowbridge Limited | Real estate | 2016 |
| Harry and Wilma Limited | Wholesale & retail | 2024 |
| Harry Ford Limited | Wholesale & retail | 2015 |
| Harry Pennells Ltd | Professional & scientific | 2013 |
| Harry Poxon Gear UP Music Ltd | Information & communication | 2025 |
| Harry Slack Furnishings Limited | Real estate | 1947 |
| Harryboy INK Limited | Arts & recreation | 2021 |
| Harryrs Ltd | Wholesale & retail | 2022 |
| Hart Estates Ltd | Real estate | 2022 |
| Hart GT Ltd | Wholesale & retail | 2017 |
| Hart Rental Properties Ltd | Real estate | 2019 |
| Hart Shaw Business Services Limited | Extraterritorial | 2010 |
| Hart Shaw Limited | Professional & scientific | 2024 |
| Hart Shaw LLP | | 2005 |
| Hart Simpson Ltd | Real estate | 2020 |
| Harthill Consulting Solutions Limited | Financial services | 2010 |
| Harthill Developments Limited | Manufacturing | 1959 |
| Harthill Precision Abrasives Limited | Manufacturing | 1992 |
| Harthill Properties Ltd | Real estate | 2021 |
| Harthill Regrinding Services Limited | Manufacturing | 1965 |
| Harthill Village Hall Limited | Other services | 2010 |
| Hartington Road Management Company Limited | Real estate | 2022 |
| Hartlett Axle Systems Limited | Professional & scientific | 2010 |
| Hartley & Haslam Limited | Real estate | 2016 |
| Hartley Farming Limited | Real estate | 1997 |
| Hartley Hepworth FBA Limited | Financial services | 2003 |
| Hartley Hepworth Holdings Limited | Financial services | 2005 |
| Hartley Hepworth Services Limited | Financial services | 2003 |
| Hartley Management Group Ltd | Public administration | 2026 |
| Hartley's Property Company Ltd | Real estate | 2017 |
| Hartrose Associates Ltd | Professional & scientific | 2013 |
| Hartrose Estates Ltd | Real estate | 2020 |
| Hartrose Foundation Ltd | Other services | 2020 |
| Hartrose Wealth Management Ltd | Professional & scientific | 2016 |
| Hartwith International LLP | | 2010 |
| Hartwith Management Services Limited | Information & communication | 2013 |
| Harun Fresh Food Limited | Wholesale & retail | 2026 |
| Harun Fresh Food-Sh Ltd | Wholesale & retail | 2026 |
| Harveston Limited | Real estate | 1988 |
| Harvey Facilities Management Limited | Construction | 2016 |
| Harvey Maker Limited | Manufacturing | 2025 |
| Harvey Pharma Ltd | Wholesale & retail | 2014 |
| Harveybarrygeorge Limited | Financial services | 2025 |
| Harveys (Leisure) Limited | Extraterritorial | 2012 |
| Harveys Estates Ltd | Real estate | 2026 |
| Harveys Optical (Darnall) Ltd | Wholesale & retail | 2026 |
| Harveys Optical Ltd | Wholesale & retail | 2024 |
| Harwood Street Studio Community Interest Company | Information & communication | 2025 |
| Hasa Enterprises Community Interest Company | Hospitality | 2009 |
| Hashbrownies Ltd | Wholesale & retail | 2013 |
| Hashemi Limited | Health & social care | 2003 |
| Hashim and Anum Real Estate Ltd | Real estate | 2025 |
| Hashmash Tech Limited | Wholesale & retail | 2025 |
| Hasinas Balti House Ltd | Hospitality | 2017 |
| Haslam Management Consultancy Limited | Professional & scientific | 2021 |
| Hasland Associates Limited | Professional & scientific | 2001 |
| Hasmina Group of Companies Ltd | Wholesale & retail | 2025 |
| Hassan Auto Repairs Ltd | Wholesale & retail | 2025 |
| Hassan's Hub Limited | Wholesale & retail | 2025 |
| Hassani Tyre Ltd | Wholesale & retail | 2025 |
| Hastagg Limited | Wholesale & retail | 2026 |
| Hastings PUB Company Ltd | Hospitality | 2024 |
| Hastoo Investments Ltd | Financial services | 2021 |
| Hastoo Ltd | Real estate | 2021 |
| Hastoo Properties Ltd | Real estate | 2021 |
| HAT Shutters Limited | Construction | 2006 |
| Hatch Product Design Ltd | Professional & scientific | 2021 |