| Greenmoss Limited | Wholesale & retail | 1989 |
| Greenway Property Ltd | Construction | 2018 |
| Greenway Serviced Accommodation Limited | Households | 2019 |
| Greenwith Partners Limited | Health & social care | 2019 |
| Grenada Villa Ltd | Real estate | 2018 |
| Greymare Farm Limited | Real estate | 2017 |
| Greyson Homes Ltd | Construction | 2026 |
| Griffco Ltd | Real estate | 2025 |
| Griffin Construction Services Limited | Professional & scientific | 2021 |
| Griffin Forensics Ltd | Information & communication | 2006 |
| Griffin Health Physics Ltd | Other services | 2009 |
| Griggs Garage Ltd | Wholesale & retail | 2025 |
| Grimwood & SON Ltd | Transport & logistics | 2008 |
| Gripsure (International) Limited | Manufacturing | 2017 |
| Gripsure (UK) Limited | Manufacturing | 2010 |
| Groovy Studios Ltd | Information & communication | 2021 |
| Groundforce (SW) Ltd | Construction | 2026 |
| Group Ninety Seven Property Management Ltd | Real estate | 2025 |
| Grove Developments (Cornwall) Limited | Households | 2018 |
| Grove Digital (UK) Ltd | Information & communication | 2005 |
| Grove Financial Services (UK) Ltd. | Financial services | 2012 |
| Grow Southwest Ltd | Agriculture & fishing | 2025 |
| Growing Your Profits LLP | | 2013 |
| GTR Capital Limited | Real estate | 2022 |
| GTR Fitness Ltd | Wholesale & retail | 2020 |
| Guardline Ltd | Information & communication | 2021 |
| Guarlford Ltd | Health & social care | 2024 |
| Guberno Capital Limited | Financial services | 2014 |
| Guberno Ltd | Real estate | 2012 |
| Guillemot Advisory Ltd | Administrative & support | 2024 |
| Gull Rock Productions Ltd | Arts & recreation | 2019 |
| GUM Health, Bath & Bristol Periodontal Clinic Ltd | Health & social care | 2020 |
| Gunn Businesses Ltd | Real estate | 2019 |
| GUR Build UK Limited | Construction | 2017 |
| GW Global Insights Bidco Limited | Information & communication | 2022 |
| GW Global Insights Midco Limited | Information & communication | 2022 |
| GW Global Insights Topco Limited | Information & communication | 2022 |
| Gweal an Top Management Company Ltd | Households | 2013 |
| Gwel Holdings Ltd | Administrative & support | 2020 |
| Gwel Marten Residents' Association Limited | Households | 1985 |
| Gwel-An-Mor (Management) Limited | Households | 1980 |
| Gwendra Cabins Limited | Hospitality | 2025 |
| Gwendroc Flats Management Company Limited | Households | 1987 |
| Gwerdelen Limited | Wholesale & retail | 2020 |
| Gwerin Limited | Construction | 2021 |
| Gwineas Developments Ltd | Professional & scientific | 2017 |
| Gwithian Farm Limited | Hospitality | 2009 |
| GWP Acquisitions Ltd | Real estate | 2018 |
| H & G Electrical (SW) Limited | Construction | 2009 |
| H & I Beauty Retreat Limited | Other services | 2018 |
| H F Produce Limited | Manufacturing | 2014 |
| H&Icrowle Ltd | Wholesale & retail | 2024 |
| H. Mason Limited | Real estate | 1977 |
| H.Hocking and SON Limited | Real estate | 1959 |
| H.L. Smith (Holdings) Limited | Professional & scientific | 1982 |
| H2OMAX Ltd | Agriculture & fishing | 2025 |
| Hager Groundworks Limited | Construction | 2024 |
| Halcyon Stores Ltd | Wholesale & retail | 2023 |
| Hall for Cornwall Limited | Arts & recreation | 1990 |
| Hallawell M & PT Limited | Professional & scientific | 2005 |
| Hallmark of Truro Ltd | Wholesale & retail | 2026 |
| Hamilton Close (Management Company) Limited | Real estate | 2026 |
| Hammer Technologies Limited | Manufacturing | 2013 |
| Hand in Hand Kernow Care Ltd | Health & social care | 2026 |
| Hanin Gents Hairdressers Ltd | Other services | 2018 |
| Hannafore Point Limited | Hospitality | 1998 |
| Hannbelle Limited | Real estate | 2019 |
| Hannon & Cook Ltd | Hospitality | 2019 |
| Hannon PUB Co. Ltd | Hospitality | 2020 |
| Hanover Parc Management Company (2010) Limited | Households | 2010 |
| Hansen Financial Planning Limited | Financial services | 2017 |
| Happy Business Consultants Ltd | Professional & scientific | 2023 |
| Happy Energy Holdings Limited | Financial services | 2014 |
| Happy Energy Solutions Ltd | Construction | 2013 |
| Happy Food 68 Limited | Hospitality | 2025 |
| Happy Piranha Ltd | Wholesale & retail | 2018 |
| Harbour Business Support Limited | Administrative & support | 2023 |
| Harbour View House Limited | Hospitality | 2019 |
| Harbourmaster Accommodation Ltd | Hospitality | 2020 |
| Hard Pressed Threads Limited | Wholesale & retail | 2008 |
| Hardy House Maintenance Limited | Households | 2016 |
| Harford Management & Consultancy Limited | Professional & scientific | 2020 |
| Harlyn Estates LLP | | 2023 |
| Harmony GI Surgery Limited | Health & social care | 2024 |
| Harold L.Bates & SON Limited | Real estate | 1945 |
| Harper Group Enterprises Limited | Financial services | 2016 |
| Harper Property Holdings Limited | Real estate | 2020 |
| Harri Silver Ltd | Manufacturing | 2024 |
| Harris Healthcare (Bristol) Limited | Health & social care | 2014 |
| Harrison Construction & Carpentry Ltd | Administrative & support | 2017 |
| Harrowbeer Homes Limited | Real estate | 2002 |
| Hart P S Ltd | Administrative & support | 2024 |
| Hartwood Timber Limited | Manufacturing | 2012 |
| Harva Developments Ltd | Construction | 2024 |
| Harvey's Yard Management Company Limited | Households | 2021 |
| Hatch Match and Dispatch Celebrancy Ltd | Other services | 2018 |
| Hattam Construction Limited | Construction | 2010 |
| Havenmist Limited | Real estate | 2004 |
| Hawthorn Close Management Co Ltd | Households | 2022 |
| HAY & Pascall Bespoke Ltd | Manufacturing | 2025 |