| Harkers (DRY Liners & Plasterers) Limited | Construction | 2003 |
| Harkness Associates Limited | Professional & scientific | 2004 |
| Harkon Investments Limited | Real estate | 2026 |
| Harlams Ltd | Wholesale & retail | 2024 |
| Harlech Land Ltd | Administrative & support | 2022 |
| Harlem Group Ltd | Transport & logistics | 2026 |
| Harlem Trading Limited | Wholesale & retail | 2023 |
| Harlequin Heights RTM Company Ltd | Households | 2014 |
| Harlily Capital Limited | Professional & scientific | 2024 |
| Harlily Ltd | Other services | 2025 |
| Harlow Moor Limited | Real estate | 2026 |
| Harlow Therapies Ltd | Health & social care | 2022 |
| Harlowoval Developments Ltd | Financial services | 2023 |
| Harlows Leeds Limited | Other services | 2015 |
| Harman Data Integration Ltd | Information & communication | 2026 |
| Harmonai Hub Limited | Other services | 2024 |
| Harmonia Therapy Ltd | Health & social care | 2015 |
| Harmonic Hearing Care Limited | Wholesale & retail | 2025 |
| Harmonn Ltd | Manufacturing | 2023 |
| Harmonnix Ltd | Other services | 2019 |
| Harmony Children's Services Limited | Health & social care | 2010 |
| Harmony Hypnosis Ltd | Health & social care | 2009 |
| Harmony Hypnotherapy Ltd | Health & social care | 2015 |
| Harmony in Motion - Acts of Creation CIC | Arts & recreation | 2024 |
| Harmony Independent Support Ltd | Health & social care | 2026 |
| Harmony Kitchens & Bedrooms Limited | Construction | 2002 |
| Harmony M&C Ltd | Administrative & support | 2024 |
| Harmony Networks Limited | Information & communication | 2003 |
| Harmony of Health LT UK Limited | Wholesale & retail | 2025 |
| Harmony Property Investments & Development Ltd | Real estate | 2019 |
| Harnev Group Limited | Hospitality | 2025 |
| Harnic Development Limited | Construction | 2019 |
| Harold Henry Holdings Ltd | Construction | 2019 |
| Harold Newsome Developments Limited | Construction | 2019 |
| Harold Newsome Group Limited | Financial services | 2019 |
| Harold Newsome Holdings Limited | Professional & scientific | 2012 |
| Harold Newsome Limited | Manufacturing | 1937 |
| Haroon Editer Limited | Wholesale & retail | 2026 |
| Harpar Qualifications Limited | Education | 2015 |
| Harperhyne Company Limited | Health & social care | 2021 |
| Harperjobling Ltd | Professional & scientific | 2021 |
| Harpers Property Holdings Ltd | Financial services | 2026 |
| Harquebus International Ltd | Professional & scientific | 2014 |
| Harquebus Limited | Professional & scientific | 2010 |
| Harriet Construction Holdings Limited | Real estate | 2025 |
| Harriet Construction Ltd | Construction | 2025 |
| Harriets Cleaning Services Ltd | Administrative & support | 2026 |
| Harrington Franklin Limited | Construction | 2019 |
| Harris & Green Solicitors Ltd | Professional & scientific | 2011 |
| Harris & Myers Construction Ltd | Construction | 2024 |
| Harris & Myers Ltd | Financial services | 2023 |
| Harris & Myers Properties Ltd | Real estate | 2024 |
| Harris & Smith Family Transport Ltd | Transport & logistics | 2019 |
| Harris Bespoke Interiors Limited | Manufacturing | 2020 |
| Harris Carlton Ltd | Professional & scientific | 2022 |
| Harris Fairfax Ltd | Wholesale & retail | 2019 |
| Harris Ideas and Copy Limited | Information & communication | 2008 |
| Harris Landscapes Limited | Administrative & support | 2005 |
| Harris Lynch Lettings Ltd | Real estate | 2023 |
| Harris Real Estate (Services) Limited | Real estate | 2011 |
| Harrison Brothers (Steeplejacks) Limited | Wholesale & retail | 1950 |
| Harrison Cleans Limited | Administrative & support | 2025 |
| Harrison Coultas Limited | Construction | 2022 |
| Harrison Driver Hire Ltd | Transport & logistics | 2023 |
| Harrison Electrical (Leeds) Limited | Construction | 2010 |
| Harrison Electrical Limited | Construction | 1994 |
| Harrison Ford Travel Limited | Professional & scientific | 2019 |
| Harrison GAS Ltd | Manufacturing | 2016 |
| Harrison Goddard Foote LLP | | 2013 |
| Harrison Home Developments Limited | Construction | 1998 |
| Harrison House Management Limited | Real estate | 2006 |
| Harrison Joinery Limited | Construction | 2021 |
| Harrison Kooiman Properties Ltd | Real estate | 2018 |
| Harrison Lofts Ltd | Construction | 2023 |
| Harrison Neville Investments Limited | Real estate | 2004 |
| Harrison Planning & Consultancy Ltd | Financial services | 2022 |
| Harrison Rentals Limited | Real estate | 2018 |
| Harrison Smith Limited | Professional & scientific | 2009 |
| Harrison Spinks Beds Holdings Limited | Financial services | 2024 |
| Harrison Spinks Beds Ltd | Manufacturing | 1933 |
| Harrison Spinks Events Ltd | Hospitality | 2009 |
| Harrison Spinks Farm Holdings Limited | Financial services | 2018 |
| Harrison Tiling Services Limited | Construction | 2019 |
| Harrison Ventures Ltd | Real estate | 2024 |
| Harrisons Flooring Limited | Construction | 2020 |
| Harrista Encasa Limited | Wholesale & retail | 2014 |
| Harrogate Auto Motors Ltd | Wholesale & retail | 2015 |
| Harrogate Cashmere Company Ltd | Wholesale & retail | 2020 |
| Harrogate Contract Cleaners Limited | Administrative & support | 2014 |
| Harrogate Fine Wine Company Limited | Wholesale & retail | 1997 |
| Harrogate Garden Ltd | Hospitality | 2020 |
| Harrogate Horseless Carriages Limited | Extraterritorial | 2005 |
| Harrogate Horseless Carriages Motorsport Limited | Administrative & support | 2003 |
| Harrogate House (Maintenance) Limited | Households | 2004 |
| Harrogate Imaging Limited | Health & social care | 2018 |
| Harrogate Lifestyle Apartments Limited | Real estate | 2010 |
| Harrogate Property Maintenance Ltd | Construction | 2023 |
| Harrogate Road (Leeds) Flat Management Company Limited | Households | 1983 |
| Harrogate Road Restaurants Limited | Hospitality | 2012 |
| Harrogate School of Swimming Limited | Education | 2014 |