| Harborough & Cornish Limited | Manufacturing | 2015 |
| Harborough Building and Developments Ltd | Construction | 2026 |
| Harborough Car Sales Limited | Wholesale & retail | 2018 |
| Harborough Flat Roofing Ltd | Construction | 2019 |
| Harborough Horticulture Limited | Administrative & support | 2026 |
| Harborough London Limited | Real estate | 2003 |
| Harborough Plant Hire Ltd | Administrative & support | 2024 |
| Harbot (Builders) Ltd | Construction | 2001 |
| Harbour Hill Holdings Limited | Real estate | 2026 |
| Harbourside Psychology Solutions Limited | Health & social care | 2020 |
| Harco Consulting Limited | Professional & scientific | 2016 |
| Harcourt Enterprises Limited | Wholesale & retail | 2016 |
| Harcourt Financial Limited | Financial services | 2017 |
| Harcourt Garage Limited | Wholesale & retail | 2009 |
| Harcourt Global Limited | Other services | 2014 |
| Harcourt Repairs Ltd | Construction | 2016 |
| Harcourt Wealth Ltd | Financial services | 2020 |
| Hard Touch Ltd | Manufacturing | 2018 |
| Hard Yards Sports Ltd | Manufacturing | 2021 |
| Hardcore Medical & Ambulance Services Limited | Other services | 2016 |
| Hardik Ltd | Transport & logistics | 2026 |
| Hardline Roofing & Building Ltd | Construction | 2026 |
| Hardman Estates Limited | Real estate | 2017 |
| Hardstaff Estates (Holdings) Limited | Financial services | 2022 |
| Hardstaff Estates Limited | Real estate | 2017 |
| Hardwicks Developments Ltd | Real estate | 2017 |
| Hardwicks Management Company Limited | Households | 2018 |
| Hardy Planter Ltd | Administrative & support | 2024 |
| Hare and Hounds Hebden Bridge Ltd | Hospitality | 2020 |
| Hareed Import & Export Ltd | Wholesale & retail | 2023 |
| Harem Barber Ltd | Other services | 2025 |
| Harem Electricals Ltd | Construction | 2020 |
| Harford Logistics Ltd | Transport & logistics | 2014 |
| Hargreaves Engineering Limited | Administrative & support | 2018 |
| Harho Limited | Manufacturing | 2012 |
| Hari AUM Holdings Limited | Real estate | 2023 |
| Hari Estates Ltd | Real estate | 2005 |
| Hari Holdings Limited | Real estate | 2020 |
| Hari Investments Limited | Real estate | 2005 |
| Hari OM Jewels Ltd | Manufacturing | 2023 |
| Hari PM Limited | Professional & scientific | 2021 |
| Hari Singh Nalwa Combat Academy C.I.C. | Arts & recreation | 2024 |
| Hari-Mai Limited | Professional & scientific | 2026 |
| Haribol Beyond 2000 Limited | Real estate | 2024 |
| Hariir Shop Ltd | Wholesale & retail | 2023 |
| Harikrishan Ltd | Transport & logistics | 2025 |
| Harilal Investments Ltd | Real estate | 2022 |
| Harinaman Ltd | Real estate | 2023 |
| Harins Limited | Real estate | 2002 |
| Haris AR Limited | Real estate | 2025 |
| Harishsundar Limited | Health & social care | 2014 |
| Hariti Accountancy Limited | Professional & scientific | 2025 |
| Harjee Developments Ltd | Real estate | 2025 |
| Harjee Ltd | Wholesale & retail | 2023 |
| Harjyot Limited | Wholesale & retail | 2026 |
| Hark 2 Limited | Information & communication | 2010 |
| Harkara Group Ltd | Real estate | 2026 |
| Harkaway Properties Ltd | Real estate | 2026 |
| Harklin Creations Ltd | Manufacturing | 2021 |
| Harkom IT Ltd | Information & communication | 2010 |
| Harl Holdings Limited | Financial services | 2025 |
| Harl Services Limited | Administrative & support | 2026 |
| Harlaxton Properties Ltd | Construction | 2016 |
| Harlaxton Water Works Ltd | Construction | 2016 |
| Harlequin Event Management Limited | Arts & recreation | 1992 |
| Harlequin Motors Limited | Manufacturing | 2006 |
| Harleston Close Management Company Limited | Households | 2015 |
| Harlestone Smile Care Limited | Real estate | 2010 |
| Harley Medical Group Ltd | Health & social care | 2025 |
| Harley Street Evening Doctors Ltd | Health & social care | 2026 |
| Harleyhair Ltd | Health & social care | 2025 |
| Harleys Corrugated Cases Holdings Limited | Financial services | 2021 |
| Harleys Corrugated Cases Limited | Manufacturing | 1966 |
| Harleywood Logistics Ltd | Transport & logistics | 2014 |
| Harlogistics Limited | Transport & logistics | 2025 |
| Harlows Renovations Ltd | Construction | 2022 |
| Harman Building Works Ltd | Construction | 2018 |
| Harman Creations Ltd | Construction | 2024 |
| Harman Trans Logistics Limited | Transport & logistics | 2019 |
| Harmelix Ltd | Other services | 2025 |
| Harmny Limited | Arts & recreation | 2023 |
| Harmonic Series Ltd | Information & communication | 2026 |
| Harmony Holdings Ltd | Real estate | 2021 |
| Harmony House FP Ltd | Financial services | 2022 |
| Harmony Orbit Ltd | Real estate | 2025 |
| Harmony Radio Limited | Information & communication | 2018 |
| Harneez Ltd | Transport & logistics | 2020 |
| Harni Limited | Construction | 2018 |
| Haro Ltd | Wholesale & retail | 2024 |
| Harold and Bryant Ltd | Real estate | 2022 |
| Haroons Optical Ltd | Health & social care | 2023 |
| Harp Food Limited | Manufacturing | 2026 |
| HARP80 Ltd | Wholesale & retail | 2019 |
| Harpin Family Holdings Ltd | Financial services | 2023 |
| Harps Dhillon Ltd | Administrative & support | 2018 |
| Harracott Originals Ltd | Construction | 2015 |
| Harraton Transport Ltd | Transport & logistics | 2014 |
| Harri Transport Ltd | Transport & logistics | 2024 |
| Harria Property Group Ltd | Real estate | 2023 |
| Harrier Ventures Limited | Financial services | 2023 |