| Harborough Ecovillage CIC | Wholesale & retail | 2019 |
| Harborough Fayres C.I.C. | Administrative & support | 2017 |
| Harborough Fencing Ltd | Construction | 2013 |
| Harborough Fire and Safety Ltd | Public administration | 2018 |
| Harborough Food and Wine Ltd | Wholesale & retail | 2022 |
| Harborough Hearing Care Limited | Wholesale & retail | 2019 |
| Harborough Home Care Limited | Health & social care | 2023 |
| Harborough Kitchens Ltd. | Manufacturing | 2009 |
| Harborough Land 2 Limited | Professional & scientific | 2025 |
| Harborough Landscape Contractors Ltd | Administrative & support | 2023 |
| Harborough Legal Limited | Professional & scientific | 2025 |
| Harborough Mews Care Limited | Health & social care | 2022 |
| Harborough Monitoring Limited | Administrative & support | 2025 |
| Harborough Mortgages Ltd | Financial services | 2012 |
| Harborough Pilates Centre Ltd | Arts & recreation | 2020 |
| Harborough Pressure Washing Ltd | Administrative & support | 2024 |
| Harborough Psychology Practice Limited | Health & social care | 2020 |
| Harborough Rewire Team Ltd | Construction | 2025 |
| Harborough Solar Ltd | Construction | 2025 |
| Harborough Stone Limited | Construction | 2004 |
| Harborough Town Community Trust | Arts & recreation | 2015 |
| Harborough Town FC | Arts & recreation | 2015 |
| Harborough Town Hub CIC | Professional & scientific | 2024 |
| Harborough Town Trading Limited | Arts & recreation | 2008 |
| Harborough Youth and Community Trust | Health & social care | 2005 |
| Harbour Capital Limited | Financial services | 2025 |
| Hardy Finance Limited | Wholesale & retail | 2004 |
| Haripongo 2014 Limited | Financial services | 2014 |
| Harman & Hunter Accountants and Business Advisers Ltd | Professional & scientific | 2013 |
| Harpers Brook Management Limited | Households | 2008 |
| Harrison Wellness Limited | Health & social care | 2025 |
| Harry Chapman Window Systems Limited | Construction | 1999 |
| Harry Darby Associates Limited | Professional & scientific | 2008 |
| Harry Drew Construction Limited | Construction | 2022 |
| Harwayes Holdings Limited | Real estate | 1947 |
| Harwinn Agricultural and Construction Services Ltd | Construction | 2019 |
| Hashtag ME Limited | Information & communication | 2018 |
| Haste Theatre Ltd | Arts & recreation | 2019 |
| Haverberg Building Services Limited | Construction | 2006 |
| Hawker Racing Limited | Wholesale & retail | 2012 |
| HAY Hampers Limited | Wholesale & retail | 1991 |
| HAY Lets Ltd | Real estate | 2024 |
| Haybrooke Associates Limited | Information & communication | 2006 |
| Hazbin Commercial Cleaners Ltd | Administrative & support | 2023 |
| HCD Solutions Ltd | Other services | 2026 |
| Head Candy Hairdressing Ltd | Wholesale & retail | 2013 |
| Heads UP Rehabilitation Ltd | Professional & scientific | 2017 |
| Health Touch Life Ltd | Health & social care | 2024 |
| Heatserv Solutions Ltd | Construction | 2013 |
| Hebe Holdings Company Limited | Financial services | 2026 |
| Helvetica MP Ltd | Wholesale & retail | 2025 |
| Henceforth Bitcoin Limited | Information & communication | 2022 |
| Henketye Investments Ltd | Real estate | 2017 |
| Henry Spain Investment Services Limited | Financial services | 2010 |
| HEP Food Consulting Ltd | Professional & scientific | 2015 |
| Herd Ventures Ltd | Extraterritorial | 2025 |
| Herisson Management Services Ltd | Real estate | 2026 |
| Heritage Elements Ltd | Professional & scientific | 2018 |
| Heritage Wood Floors Ltd | Construction | 2001 |
| Hermitage Innovation Group Limited | Wholesale & retail | 2013 |
| Hermitage Works Limited | Real estate | 2023 |
| Hewetson Consulting Ltd | Other services | 2018 |
| Hewitt Insight Consulting Ltd | Information & communication | 2024 |
| Hewson Motor Hub Ltd | Wholesale & retail | 2019 |
| HEY Goose Ltd | Information & communication | 2024 |
| HFM Radio Limited | Information & communication | 2004 |
| Hicks (2) Limited | Manufacturing | 2008 |
| Hidcote Holdings Limited | Professional & scientific | 2019 |
| High Frequency Technology Ltd | Information & communication | 2024 |
| High Impact Education Services. Limited | Education | 2013 |
| Hilltop Equity LLP | | 2011 |
| Hilltop Hospitality Advisors Ltd | Professional & scientific | 2019 |
| Hilly Real Estate Consultancy Ltd | Professional & scientific | 2021 |
| Historica Ltd | Wholesale & retail | 2010 |
| Hive and Rocket LLP | | 2020 |
| Hlmnd Properties Ltd | Real estate | 2025 |
| HMC Projects in Central and Eastern Europe | Education | 1998 |
| Hmews Consultancy Ltd | Professional & scientific | 2023 |
| Hohm Developments Ltd | Construction | 2025 |
| Hollcross Hospitality Ltd | Hospitality | 2023 |
| Holloway & Naughton Limited | Manufacturing | 2001 |
| Holmleigh Haulage Limited | Transport & logistics | 2014 |
| Holt Priory Property Limited | Real estate | 2019 |
| Holt View Residents Company Limited | Households | 2006 |
| Holyoaks Farm Limited | Agriculture & fishing | 1994 |
| Holywell Valley Enterprises Ltd | Professional & scientific | 2023 |
| Horizon Environmental and Social Governance Limited | Professional & scientific | 2019 |
| Hornbeam Holdings Limited | Financial services | 2024 |
| Hospitality Post Ltd | Administrative & support | 2018 |
| Houghton Digital Ltd. | Information & communication | 2001 |
| Hourglass (DMS) Limited | Administrative & support | 2020 |
| House of Art Limited | Other services | 2024 |
| House of Spheres Limited | Wholesale & retail | 2010 |
| Howitt Associates Limited | Professional & scientific | 1966 |
| HRG Green Limited | Manufacturing | 2013 |
| Hrzn Holdings Ltd | Financial services | 2026 |
| Hstge Ltd | Wholesale & retail | 2021 |
| Htfc Fanzone Limited | Arts & recreation | 2026 |
| Huffington Enterprises Limited | Hospitality | 2020 |
| Hugo's Homes Ltd | Real estate | 2023 |