| GF South West Limited | Professional & scientific | 2022 |
| Gilbury 2 Management Co. Ltd | Real estate | 2017 |
| Gillett Investments Ltd | Professional & scientific | 2018 |
| Gio&Mo LLP | | 2025 |
| Glamgulltech Ltd | Information & communication | 2025 |
| Glazed and Roasted Ltd | Hospitality | 2024 |
| Glenn Collis Limited | Other services | 2018 |
| Glide and Grin Ltd. | Extraterritorial | 2013 |
| Glocrete Ltd | Manufacturing | 2017 |
| Glowarm Plumbing & Heating(Cornwall) Ltd | Construction | 2011 |
| Glynn Barton Limited | Hospitality | 2021 |
| Glynn Mill Ltd | Hospitality | 2025 |
| Gold Wolf Silver Stag Limited | Real estate | 2024 |
| Golden FRY Bodmin Ltd | Hospitality | 2021 |
| Goof Golf Limited | Wholesale & retail | 2023 |
| Gormenghast Limited | Administrative & support | 2014 |
| Graftin Ltd | Wholesale & retail | 2025 |
| Granite Data Systems Ltd | Administrative & support | 1996 |
| Grassroots Farming Impact Ltd | Agriculture & fishing | 2026 |
| Grassroots Farming Ltd | Wholesale & retail | 2020 |
| Grata Opus Limited | Information & communication | 2016 |
| Gregory Property Solutions Ltd | Construction | 2026 |
| Grenville Meadow Management Company Limited | Households | 2006 |
| Grove House Management Company (Falmouth) Limited | Households | 2005 |
| Gulpepper Ltd | Wholesale & retail | 2018 |
| H&H Scaffolding (SW) Limited | Construction | 2012 |
| Haines Recovery Ltd | Transport & logistics | 2022 |
| Halgavor Properties Limited | Real estate | 2017 |
| Hamatethy LLP | | 2014 |
| Hancock Holdings (Southwest) Limited | Real estate | 2025 |
| Handover HR Limited | Professional & scientific | 2023 |
| Happy Clean Ltd | Administrative & support | 2019 |
| Harbour Village (Management Company) Limited | Households | 2004 |
| Hardhead Limited | Professional & scientific | 2007 |
| Harnby-Corbett Properties Limited | Real estate | 2016 |
| Hatton Energy Limited | Construction | 2008 |
| Havenstone Property Limited | Real estate | 2006 |
| Hawkey Developments Limited | Real estate | 2020 |
| HCL Howarth Cornwall Limited | Education | 2000 |
| Health & Safety Associates (South West) Ltd | Professional & scientific | 2015 |
| Hebask Ltd | Professional & scientific | 2016 |
| Hellandbridge Treatment Limited | Households | 2019 |
| Hemmings Partnership Limited | Construction | 2013 |
| Hepzibah Pink Limited | Wholesale & retail | 2017 |
| Heyl Kitchens Ltd | Professional & scientific | 2026 |
| Highcliffe Management Company Limited | Real estate | 1998 |
| Highcliffe Management Company Two Limited | Real estate | 2000 |
| Hightriple Limited | Construction | 1990 |
| Hilgrove Mews Residents Association Limited | Real estate | 2018 |
| Hill Tribe Media Limited | Information & communication | 2022 |
| Hill Tribe Productions Limited | Information & communication | 2006 |
| HM Homes Property Limited | Real estate | 2025 |
| Hohm Systems Ltd | Professional & scientific | 2019 |
| Holistic Herd Health Ltd | Professional & scientific | 2020 |
| Holistic Silk Limited | Manufacturing | 2005 |
| Holm Oak (Falmouth) Limited | Households | 2009 |
| Holmbush Windows Limited | Manufacturing | 2009 |
| Home-Start Kernow | Health & social care | 2014 |
| Hopeful Hearts Companionship C.I.C. | Health & social care | 2025 |
| Horizon Agri Ltd | Agriculture & fishing | 2025 |
| Hosken Properties Ltd | Construction | 2019 |
| Housetrap Ltd | Arts & recreation | 2021 |
| HR Partners Ltd | Administrative & support | 2023 |
| Hsvc Ltd | Wholesale & retail | 2015 |
| Hweg Rosva Ltd | Real estate | 2018 |
| Hyphae Earth Ltd | Manufacturing | 2022 |
| I.Q. Developments (UK) Limited | Real estate | 2004 |
| Ibot Productions Ltd | Financial services | 2025 |
| Ibounce Cornwall Ltd | Arts & recreation | 2016 |
| Ibuntu (Bodmin) Limited | Health & social care | 2024 |
| Ibuntu Holdings Limited | Financial services | 2024 |
| Ibuntu Limited | Health & social care | 2017 |
| Idenna Limited | Professional & scientific | 2003 |
| Income Energy Ltd | Professional & scientific | 2022 |
| Interiors for Homes Ltd | Wholesale & retail | 2008 |
| Intobodmin CIC | Arts & recreation | 2017 |
| Intoeverywhere Ltd | Arts & recreation | 2021 |
| Ivan Jones Electrical Services Limited | Construction | 2003 |
| Ivyleaf Combe Holidays Limited | Hospitality | 2011 |
| J & K Automotive Limited | Wholesale & retail | 2021 |
| J B Services SW Ltd | Construction | 2022 |
| J D Construction (Cornwall) Ltd | Construction | 2020 |
| J Daniel Holdings Limited | Financial services | 2020 |
| J Delacoe Construction Ltd | Construction | 2016 |
| J Orchard Construction Ltd | Construction | 2018 |
| J P Holdings (Cornwall) Ltd | Real estate | 2016 |
| J Parkyn Limited | Information & communication | 2023 |
| Jaffa Incorporated Limited | Extraterritorial | 1982 |
| James Thomas Tarmacadam Contractors Limited | Construction | 2007 |
| James Wilton Dance Limited | Arts & recreation | 2014 |
| Jasper Holdings (Cornwall) Ltd | Financial services | 2024 |
| Jata Connections Ltd | Construction | 2022 |
| Jata Construction (Cornwall) Limited | Construction | 2019 |
| JAY JAY Sports Limited | Manufacturing | 1992 |
| JB Music Management Ltd | Arts & recreation | 2025 |
| Jbje Group Limited | Financial services | 2023 |
| Jbrady Cars Ltd | Wholesale & retail | 2021 |
| JC Waste and Clean Ltd | Water & waste | 2024 |
| JCJ Property Management Limited | Real estate | 2023 |
| JDW Construction Ltd | Construction | 2021 |