| Heft Supply Ltd | Wholesale & retail | 2026 |
| HEH (Devon) Limited | Financial services | 1999 |
| Heights Lodges Limited | Hospitality | 2025 |
| Hekk Consulting Ltd | Administrative & support | 2015 |
| HEL Performance Limited | Extraterritorial | 2013 |
| Held Health Limited | Health & social care | 2023 |
| Hele Hub CIC | Education | 2010 |
| Helen Caroline Wright Limited | Mining & quarrying | 2024 |
| Helen of Troy Boutique Ltd | Wholesale & retail | 2021 |
| Helen Swaffield Associates Ltd | Real estate | 2014 |
| Helen Swafield Associates LLP | | 2025 |
| Helifilms Services (UK) Limited | Information & communication | 2012 |
| Helix Dimensions Limited | Education | 2015 |
| Helliar Commercial Cleaning Ltd | Administrative & support | 2024 |
| Hellier Ridley Limited | Real estate | 2014 |
| Hellums Field Solar Park Limited | Energy | 2012 |
| Helly’S Cleaning Services Limited | Administrative & support | 2025 |
| Helm Squared Ltd | Administrative & support | 2010 |
| Helm Tickets Ltd | Administrative & support | 2018 |
| Helmart Properties Limited | Real estate | 1996 |
| Help Search Locate Ltd | Administrative & support | 2022 |
| Hemfood Services Ltd | Hospitality | 2024 |
| Hemley Advisory Services Limited | Professional & scientific | 2024 |
| Hemyock 21 Properties Limited | Real estate | 2004 |
| Hender & Sons,Limited | Real estate | 1929 |
| Hendham Limited | Agriculture & fishing | 2012 |
| Hening Ltd | Administrative & support | 2019 |
| Henley Green Ltd | Real estate | 2018 |
| Hennock Properties Limited | Real estate | 2009 |
| Henri Emile Ltd. | Wholesale & retail | 2014 |
| Henry Sibun Associates Limited | Real estate | 2011 |
| Henry Sibun Holdings Limited | Financial services | 2019 |
| Henry W. Pollard & Sons Limited | Construction | 1979 |
| Hensleigh House Limited | Households | 1959 |
| Henstridge Airfield Partnership NO.2 LLP | | 2006 |
| Heppell Chancel (1985) Limited | Professional & scientific | 1971 |
| Hera Bay UK Ltd | Real estate | 2007 |
| Herbies Hospitality Limited | Hospitality | 2024 |
| Herbo Heal Ltd | Health & social care | 2025 |
| Heritage AM Limited | Households | 2023 |
| Heritage Construction (South West) Holdings Limited | Construction | 2015 |
| Heritage Construction (South West) Limited | Construction | 2002 |
| Heritage Developments (South West) Holdings Limited | Financial services | 2024 |
| Heritage Homes (Devon) Limited | Construction | 2024 |
| Heritage Homes (West) Limited | Construction | 2008 |
| Heritage Laser Restorations Ltd | Administrative & support | 2023 |
| Heritage Property (South West) Ltd | Households | 2023 |
| Heritage SA Limited | Households | 2023 |
| Heritage, Arts and People Community Interest Company | Professional & scientific | 2018 |
| Herolec Ltd | Construction | 2025 |
| Heron Flats Management Company (Heavitree) Limited | Households | 1974 |
| Heronlock Limited | Administrative & support | 2023 |
| Herridge Property Consulting Holdings Ltd | Real estate | 2023 |
| Herring Consultancy Limited | Professional & scientific | 2015 |
| Hesketh Healthcare Consultancy Limited | Professional & scientific | 2016 |
| Heva Barbers Ltd | Other services | 2024 |
| Hewitt and SON Limited | Construction | 2008 |
| Hexagon Holdings Limited | Financial services | 2018 |
| Hexicon Developments UK Limited | Construction | 2021 |
| HEY Sunshine! Ltd | Wholesale & retail | 2025 |
| Heyday Events Ltd | Administrative & support | 2020 |
| Heydon & Heydon LLP | | 2019 |
| Heydon Innovation Ltd | Professional & scientific | 2021 |
| Heyford Property Limited | Administrative & support | 2017 |
| Heywood Drive Management Company Limited | Households | 1990 |
| HF Autocare Limited | Wholesale & retail | 2017 |
| HF Collective Limited | Financial services | 2020 |
| HG Heritage Limited | Real estate | 2022 |
| Hhark Ltd | Hospitality | 2025 |
| HHM Bahati Limited | Real estate | 2024 |
| HI Douri DEV Ltd | Information & communication | 2016 |
| Hidden Beauty Exeter Ltd | Other services | 2019 |
| Hidden Corners Limited | Wholesale & retail | 2014 |
| Hidden Future Clothing Ltd | Wholesale & retail | 2025 |
| Hidden Oak Equestrian Ltd | Wholesale & retail | 2023 |
| Hidden Oak Ltd | Wholesale & retail | 2020 |
| Hidden Voices Heard Ltd | Professional & scientific | 2015 |
| Hideaway Spaces Limited | Construction | 2020 |
| Hider Consultants Limited | Professional & scientific | 2018 |
| Hien DO Ltd | Other services | 2021 |
| Higglesden Financial Planning Ltd | Professional & scientific | 2025 |
| High Spec Building Ltd. | Construction | 2015 |
| Highbray Care Ltd | Health & social care | 2024 |
| Highbury Road Properties Limited | Real estate | 2018 |
| Highcliff Court (Dawlish) Limited | Real estate | 1985 |
| Highcliffe Capital Ltd | Financial services | 2023 |
| Highcliffe Holdings Limited | Financial services | 2015 |
| Higher Charaton Park Management Company Limited | Households | 2022 |
| Higher Eggbeer Limited | Hospitality | 2020 |
| Higher Huxham Limited | Real estate | 2018 |
| Highfield Coachworks Limited | Wholesale & retail | 2022 |
| Highlands Borders Care Home Limited | Health & social care | 2008 |
| Highventure Investments Ltd | Financial services | 2013 |
| Highwood Grange (Newton Abbot) Limited | Households | 2002 |
| Highworth Nails Ltd | Other services | 2021 |
| Hikmat Devon CIC | Health & social care | 2011 |
| Hilditch Management Group Limited | Financial services | 2021 |
| Hill Hannay Wealth Management Ltd | Professional & scientific | 2018 |
| Hill Healthcare Ltd | Health & social care | 2024 |
| Hill International (UK) Limited | Professional & scientific | 1998 |