| Hayhurst Building Ltd | Construction | 2018 |
| Hayne Corfe Management Company Limited | Professional & scientific | 2011 |
| Hayson Developments Limited | Financial services | 2021 |
| Hayypinnacle Ltd | Health & social care | 2023 |
| HB Design & Services Limited | Wholesale & retail | 2017 |
| HCK Assets Limited | Professional & scientific | 2022 |
| Hctb Investments Ltd | Real estate | 2013 |
| HD Healing Ltd | Wholesale & retail | 2024 |
| HD Medical Services Ltd | Health & social care | 2022 |
| Headland House Ltd | Households | 2016 |
| Headland Point Management Company Limited | Households | 2003 |
| Headley Rothwell Limited | Wholesale & retail | 2016 |
| Health Clinic Cornwall Ltd | Extraterritorial | 2020 |
| Health Computing Ltd | Information & communication | 2011 |
| Health Elixir Ltd | Wholesale & retail | 2013 |
| Healthcare Design Leadership CIC | Professional & scientific | 2022 |
| Healthcare Estates Consultant Services Ltd | Professional & scientific | 2018 |
| Healthpay Ltd | Administrative & support | 2015 |
| Healthwatch Cornwall CIC | Health & social care | 2013 |
| Heanton Villas Property Management Limited | Real estate | 2007 |
| Hearn Land Ltd | Real estate | 2013 |
| Heart of the South Care Agency Limited | Health & social care | 2006 |
| Heartguru Limited | Health & social care | 2016 |
| Heartland Care Limited | Health & social care | 2024 |
| Heathcote Investments Ltd | Real estate | 2025 |
| Heather Island Preservation Group Limited | Households | 2019 |
| Heavitree Hill Limited | Hospitality | 2012 |
| Hebron Management Company Limited | Households | 2020 |
| Helen Grundy Ltd | Administrative & support | 2019 |
| Helford River Cruises and Kayaking Ltd | Arts & recreation | 2012 |
| Helios Maritime Aviation Limited | Transport & logistics | 2008 |
| Helix Energy Group Ltd | Construction | 2026 |
| Heller Ventures Ltd | Real estate | 2019 |
| Helping Hand Accounting Limited | Extraterritorial | 2009 |
| Helping Hand Computers Limited | Extraterritorial | 2009 |
| Helping Hand Holdings Limited | Administrative & support | 2009 |
| Helping Hand Recruitment Limited | Administrative & support | 2009 |
| Helston Cars Ltd | Wholesale & retail | 2018 |
| Helston Gunsmiths Limited | Administrative & support | 2002 |
| Hemp & Harmony Ltd | Manufacturing | 2018 |
| Hemphasize Ltd | Wholesale & retail | 2020 |
| HEN Picked Ltd | Wholesale & retail | 2023 |
| Henderson Property Management Ltd | Administrative & support | 2017 |
| Hendra Group Limited | Information & communication | 2025 |
| Hendra Health Store Limited | Wholesale & retail | 2020 |
| Henley Developers Ltd | Real estate | 2024 |
| Herculan UK Ltd | Construction | 2022 |
| Heronwaytrading Ltd | Wholesale & retail | 2020 |
| Herron & Gall Real Estate Ltd. | Real estate | 2023 |
| Herron Ltd | Real estate | 2024 |
| Hertzian Ltd | Information & communication | 2015 |
| Hetty Hearts Limited | Manufacturing | 2010 |
| Hewitt Financial Training Limited | Financial services | 2009 |
| Hexcraft Limited | Professional & scientific | 2025 |
| Hexton Property Management Ltd | Real estate | 2021 |
| Hftc Ltd | Wholesale & retail | 2017 |
| Hidden Brewery Limited | Manufacturing | 2016 |
| Hidden Habitat Ltd | Health & social care | 2021 |
| Hidderley Park Management Company Limited | Households | 2014 |
| Hideaway Holiday Homes Ltd | Real estate | 2002 |
| Higgins Shopping Arcade Ltd | Wholesale & retail | 2019 |
| High Atlantic (Whipsiderry) Limited | Households | 1979 |
| High Definition Construction Limited | Construction | 2025 |
| High Heart Media Ltd | Professional & scientific | 2014 |
| High Level Maintenance (Southwest) Limited | Construction | 2013 |
| Higher Carnebone Ltd | Agriculture & fishing | 2019 |
| Higher Devoran Barns Ltd | Real estate | 2023 |
| Higher Lank Farm Swimming Limited | Arts & recreation | 2014 |
| Hilary Pryor IFP Ltd | Financial services | 2023 |
| Hillcrest Games Limited | Manufacturing | 2016 |
| Hillgrove Estates (Barnstaple) Limited | Construction | 2019 |
| Hilton & Hilton Limited | Other services | 2011 |
| Hinton-Smith Financial Planning Ltd | Financial services | 2023 |
| Hire Stack Limited | Information & communication | 2024 |
| Hive Accountancy Limited | Professional & scientific | 2015 |
| Hive Business Consultancy Ltd | Professional & scientific | 2019 |
| Hive Business Group Limited | Financial services | 2015 |
| Hive Healthcare Limited | Professional & scientific | 2015 |
| Hive Marketing Solutions Limited | Professional & scientific | 2015 |
| Hive Services Limited | Administrative & support | 2015 |
| Hive Specialist Projects Limited | Professional & scientific | 2021 |
| HJR Builders Ltd | Construction | 2023 |
| HMI Traders Limited | Other services | 1985 |
| Holbeton Project Limited | Construction | 2018 |
| Holddata Limited | Real estate | 2002 |
| Hollr Education Limited | Education | 2016 |
| Hollybush Painting & Decorating Ltd | Construction | 2023 |
| Hollywell Meadow (North Molton) Management Company Limited | Households | 2025 |
| Holon Design Limited | Professional & scientific | 2010 |
| Holy Vale Wines Limited | Extraterritorial | 2014 |
| Home Farm Estate Management Limited | Households | 1990 |
| Homes Cornwall Limited | Construction | 2017 |
| Homly Property Management Limited | Real estate | 2016 |
| Hong Kong House (3MS) Limited | Hospitality | 2025 |
| Honogie Limited | Hospitality | 2025 |
| Honua Global Limited | Information & communication | 2021 |
| Hookedonmedia Ltd | Information & communication | 2012 |
| Hopley's Coaches (Holdings) Limited | Financial services | 2025 |
| Hopley's Coaches Limited | Transport & logistics | 2005 |
| Hopscotch Commercial Cleaning Services Ltd | Administrative & support | 2018 |