| Hammond Care Limited | Administrative & support | 2010 |
| Hamnegg Ltd | Wholesale & retail | 2026 |
| Handle-It Limited | Wholesale & retail | 2003 |
| Hands on Hand Home Care Ltd | Health & social care | 2024 |
| Hanlon Properties Ltd | Real estate | 2017 |
| Hannah & Craig Ltd | Wholesale & retail | 2025 |
| Hansell Drew & Co Limited | Extraterritorial | 2010 |
| Happiness IS a Relative Term Ltd | Construction | 2020 |
| Happy Butter Ltd | Manufacturing | 2023 |
| Happy Designs Limited | Other services | 2011 |
| Harbourne Developments Limited | Real estate | 2002 |
| Harbron Group Holdings Limited | Financial services | 2015 |
| Harbron Recruit Limited | Administrative & support | 2011 |
| Harbuck Housing Limited | Real estate | 2003 |
| Harding Hospitality Group Ltd | Hospitality | 2024 |
| Hares Consultancy Ltd | Professional & scientific | 2022 |
| Harmony Homes 2020 Limited | Construction | 2021 |
| Harrier Print Ltd | Financial services | 2012 |
| Harriet Haxby Limited | Wholesale & retail | 2024 |
| Harris Estates Consultancy Limited | Professional & scientific | 2025 |
| Harry & Grace Limited | Administrative & support | 2008 |
| Harry Carpentry Ltd | Manufacturing | 2025 |
| Harry's Home Improvements & Maintenance Ltd | Construction | 2020 |
| Hart Investing Ltd | Education | 2025 |
| Hartford (South West) Developments Limited | Construction | 2022 |
| Hartford (South West) Limited | Construction | 2016 |
| Hartleys (SW) Ltd | Agriculture & fishing | 2018 |
| Harvest Windows Limited | Wholesale & retail | 1987 |
| Harvey's Retreats Limited | Hospitality | 2018 |
| Harveys BUS Ltd | Transport & logistics | 2002 |
| Haslid Services Ltd | Professional & scientific | 2021 |
| Hassall and Butler Ltd | Wholesale & retail | 2024 |
| Hatton Garden Trustees Limited | Real estate | 1970 |
| Haunch UK Steel Framed Fabrications Ltd | Manufacturing | 2023 |
| Haustopia Limited | Real estate | 2018 |
| Havenvale Property Management Ltd | Real estate | 2025 |
| Hawkerland Consulting Limited | Professional & scientific | 2022 |
| Hawkmoor Cottages Residents Association Ltd | Water & waste | 1993 |
| Hawthorn & Hamilton Ltd | Real estate | 2024 |
| Hayes Wellness Ltd | Wholesale & retail | 2018 |
| Haytor Construction Ltd | Construction | 2019 |
| Haytor Court Management Company Limited | Households | 1993 |
| Haytor Engineering Ltd | Professional & scientific | 2025 |
| Haytor Health Limited | Health & social care | 2014 |
| Haytor Property Group Ltd | Financial services | 2019 |
| Haytor Property Investments Ltd | Real estate | 2022 |
| Haytor View Management Company Limited | Real estate | 2001 |
| Haywood Heating Limited | Administrative & support | 2012 |
| Hazel Close 1971 Limited | Extraterritorial | 2014 |
| Hazy Sands Holdings Limited | Financial services | 2020 |
| HC Community Cafe HQ Community Interest Company | Hospitality | 2023 |
| HD Building Contractors Ltd | Construction | 2023 |
| HDH Homes Limited | Construction | 2006 |
| Head Honcho's Salon Limited | Other services | 2024 |
| Headland Services Limited | Other services | 1993 |
| Heal & Partners Property Developments Ltd | Real estate | 2024 |
| Health and Care Innovations Limited | Information & communication | 2014 |
| Health and Care Videos Limited | Information & communication | 2015 |
| Healthcare Governance and Risk Solutions Limited | Professional & scientific | 2022 |
| Heanton House Holdings Limited | Health & social care | 2021 |
| Heanton House Property Limited | Real estate | 2022 |
| Heart of Devon Limited | Other services | 2003 |
| Hearty Hues Ltd | Arts & recreation | 2024 |
| Heatflow SW Ltd | Construction | 2026 |
| Heathcot Homes Limited | Construction | 2011 |
| Heathercombe Brake Trust | Hospitality | 2001 |
| Heatherley Estates Ltd | Real estate | 2020 |
| Heathfield Leisure Pursuits | Other services | 1997 |
| Heathfield Management (South West) Limited | Wholesale & retail | 1982 |
| Heathlands Devon Ltd | Real estate | 2018 |
| Heatworx SW Ltd | Construction | 2026 |
| Heddon Mill Limited | Construction | 2004 |
| HEI Contracting Ltd | Construction | 2021 |
| HEI Group (SW) Limited | Energy | 2018 |
| Helen Shea Ltd | Public administration | 2020 |
| Hellier & SON Construction Ltd | Construction | 2023 |
| Hellyer Holdings Limited | Administrative & support | 2025 |
| Hellyers of Honiton Limited | Wholesale & retail | 2012 |
| Heltor Environmental Limited | Extraterritorial | 2020 |
| Heltor Group Limited | Financial services | 2022 |
| Heltor Storage Limited | Real estate | 2024 |
| Hemsford Holidays Limited | Hospitality | 2011 |
| Henley Plant Limited | Construction | 2022 |
| Henney Investco Limited | Real estate | 2019 |
| Hennock Agricultural Investments Limited | Financial services | 2020 |
| Hennock Hideaways Ltd | Hospitality | 2026 |
| Hennock International Ltd | Professional & scientific | 1995 |
| Hephaestus Carpentry and Construction Ltd | Construction | 2022 |
| Herb Storytelling CIC | Education | 2026 |
| Herbal Equine Limited | Agriculture & fishing | 2011 |
| HERE4IT Limited | Information & communication | 2025 |
| Heritage Roofing Southwest Ltd | Construction | 2021 |
| Heritage Stained Glass Limited | Professional & scientific | 2013 |
| Heronwalk (Ashburton) Limited | Households | 2016 |
| Hesketh Mews Management Company Limited | Households | 1999 |
| Hestevard LLP | | 2016 |
| Hewe Medical Limited | Health & social care | 2024 |
| HEX Fire and Security (SW) Ltd | Administrative & support | 2022 |
| Hexagon Global Solutions Limited | Professional & scientific | 2019 |
| HEY Booklover HQ Limited | Wholesale & retail | 2024 |