| Harrington Engineering Ltd | Construction | 2010 |
| Harrington Jenkins Consultancy Limited | Professional & scientific | 2010 |
| Harrington Jenkins Group Limited | Financial services | 2021 |
| Harrington Porter Garden Management Limited | Administrative & support | 2020 |
| Harringtons Legal Services Ltd | Professional & scientific | 2024 |
| Harris & Co Management Limited | Households | 2015 |
| Harris & Hughes Limited | Construction | 2002 |
| Harris and Hargraves Ltd | Wholesale & retail | 2020 |
| Harris Associates (South West) Limited | Professional & scientific | 2014 |
| Harris Building & Construction Limited | Administrative & support | 2017 |
| Harris Contract Furniture Limited | Manufacturing | 2018 |
| Harris Cooling & Mechanical Ltd | Professional & scientific | 2026 |
| Harris Decorating Contractors Ltd | Construction | 2012 |
| Harris Estates (Bristol) Limited | Construction | 1999 |
| Harris Estates Limited | Real estate | 1998 |
| Harris Evolution Limited | Construction | 2010 |
| Harris Family FIC 2024 Limited | Professional & scientific | 2024 |
| Harris Geoconsult Limited | Mining & quarrying | 2011 |
| Harris Heating SW Ltd | Construction | 2026 |
| Harris Motion Ltd | Information & communication | 2025 |
| Harris Tyser Ltd | Professional & scientific | 2018 |
| Harrison Court Residents Association Limited | Households | 2004 |
| Harrison Creations Ltd | Professional & scientific | 2007 |
| Harrison Lesser Ltd | Wholesale & retail | 2023 |
| Harrisons Health and Fitness Ltd | Health & social care | 2022 |
| Harrogate Leisure Group Ltd | Financial services | 2025 |
| Harrogate Secure Shredding Ltd | Extraterritorial | 2013 |
| Harrogate Self Storage Solutions Ltd | Extraterritorial | 2019 |
| Harrogate Self Store Ltd | Extraterritorial | 2009 |
| Harrogate Storage Supplies Ltd | Extraterritorial | 2019 |
| Harroway Manor (Freehold) Limited | Households | 2010 |
| Harry Fraser Vehicle Upholstery Ltd | Manufacturing | 2021 |
| Harry Glass Estates Limited | Real estate | 1999 |
| Harry James Consulting Ltd | Information & communication | 2019 |
| Harry's Court Management Company Limited | Households | 2024 |
| Harsha & Sarah Property Limited | Real estate | 2025 |
| Harsley Associates Limited | Professional & scientific | 2010 |
| Hart & Jones Limited | Professional & scientific | 2015 |
| Hart Data Consulting Ltd | Information & communication | 2025 |
| Hart Deco Ltd | Construction | 2025 |
| Hart Forestry Ltd | Agriculture & fishing | 2018 |
| Hart Mouncher Corporation Limited | | 1988 |
| Hart of Driving Limited | Transport & logistics | 2008 |
| Hartai Ltd | Hospitality | 2025 |
| Hartcliffe & Withywood Ventures | Education | 1985 |
| Hartcliffe and Withywood Community Partnership | Other services | 2001 |
| Hartcliffe Coderz CIC | Education | 2024 |
| Hartcliffe Way Petrol Station Limited | Wholesale & retail | 2018 |
| Hartfield Flowers Ltd | Wholesale & retail | 2026 |
| Harthill Gardens Residents Association Limited | Households | 1996 |
| Harthoric Ltd | Information & communication | 2025 |
| Hartig Data Solutions Ltd | Professional & scientific | 2017 |
| Hartley Consulting Ltd | Information & communication | 2014 |
| Hartley Knight Ltd | Administrative & support | 2011 |
| Hartley Plastering Limited | Construction | 2023 |
| Hartley Ultrafast Ltd | Manufacturing | 2020 |
| Hartleywilliams Ltd | Real estate | 2017 |
| Hartmanns Books Limited | Wholesale & retail | 2024 |
| Hartnell Limited | Real estate | 1986 |
| Hartnell Taylor Cook LLP | | 2005 |
| Hartnells Limited | Real estate | 1986 |
| Hartry Global Ltd | Construction | 2015 |
| Hartwell Living Ltd | Real estate | 2026 |
| Hartzak Ltd | Wholesale & retail | 2013 |
| Harvard Associates Ltd | Administrative & support | 2015 |
| Harvem Ltd | Administrative & support | 2007 |
| Harvest Creation Limited | Professional & scientific | 2008 |
| Harvest Developments (South West) Limited | Construction | 2005 |
| Harvest Healthcare Solutions Limited | Health & social care | 2023 |
| Harvest Hosts (UK) Holding Co. Limited | Financial services | 2023 |
| Harvesthouse Christian Centre Ltd | Other services | 2022 |
| Harvestwell Ltd | Administrative & support | 2023 |
| Harvey Commercial Holdings Limited | Professional & scientific | 2016 |
| Harvey Contracts Limited | Construction | 2010 |
| Harvey Fire Doors Limited | Construction | 2023 |
| Harvey Lettings Ltd | Real estate | 2026 |
| Harvey Lloyd Developments Ltd | Real estate | 2019 |
| Harvey Lloyd Fisheries Limited | Agriculture & fishing | 2013 |
| Harvey Lloyd Property Limited | Financial services | 2013 |
| Harvey Michaels Limited | Other services | 2021 |
| Harvey Pearce Financial Ltd | Financial services | 2019 |
| Harvey PUB Co Ltd | Hospitality | 2025 |
| Harvey Shopfitters Limited | Construction | 1981 |
| Harvey Training Academy Ltd | Education | 2020 |
| Harvey's Wholesale Limited | Wholesale & retail | 2009 |
| Harveys Cellars Limited | Hospitality | 2011 |
| Harveys Scaffolding Ltd | Construction | 2007 |
| Harvinder Kaur Ltd | Professional & scientific | 2018 |
| Harwood (HR) Limited | Administrative & support | 2010 |
| Hascey Limited | Hospitality | 2025 |
| Haseeb Healthcare Limited | Health & social care | 2022 |
| Hasell Stonework & Developments Ltd | Construction | 2022 |
| Haseltine Lake Kempner LLP | | 2009 |
| Haseya International Ltd | Manufacturing | 2025 |
| Hash Tech Limited | Information & communication | 2024 |
| Hasiohr Ltd | Professional & scientific | 2023 |
| Haske Ltd | Wholesale & retail | 2019 |
| Haskells Legal Ltd | Professional & scientific | 2025 |
| Haskins Holme Rigging Limited | Construction | 2016 |
| Haslam Filter Ltd | Wholesale & retail | 2024 |