| GEM Admin Services Limited | Administrative & support | 2025 |
| Gentech Reproduction Limited | Agriculture & fishing | 2025 |
| Gentlemans Tattoo Flash Limited | Information & communication | 2011 |
| George Hughes Couriers Ltd | Transport & logistics | 2026 |
| George Seal Limited | Construction | 1981 |
| Geoseacore Ltd | Construction | 2022 |
| GET Bitter Ltd | Information & communication | 2023 |
| Giant Helston Limited | Wholesale & retail | 2016 |
| Gigi & Kiki Limited | Real estate | 2025 |
| Gilchrist Exotics Ltd | Wholesale & retail | 2021 |
| Giles Brothers Logistics Ltd | Wholesale & retail | 2023 |
| GL Kean Consulting Ltd | Professional & scientific | 2022 |
| GMC Stone Company Limited | Construction | 2014 |
| Go-For-It Fishing Co Ltd | Agriculture & fishing | 2009 |
| Goimmersive Ltd | Information & communication | 2026 |
| Going Places Property Ltd | Real estate | 2020 |
| Goldsworthy Properties Limited | Hospitality | 2010 |
| Goldvalley Properties Limited | Real estate | 2003 |
| Goonhilly Earth Station Limited | Information & communication | 2009 |
| Gould EPL Ltd | Financial services | 2019 |
| Gould Land Ltd | Agriculture & fishing | 2019 |
| Gould Property Ltd | Real estate | 2019 |
| Graceloft Limited | Construction | 1979 |
| Grade Ruan CLT Limited | Construction | 2013 |
| Graphym Designery Limited | Manufacturing | 2016 |
| Gray Smith Ltd | Transport & logistics | 2018 |
| Grcc-Luft Ltd | Professional & scientific | 2019 |
| Great British Supermarine Limited | Manufacturing | 2013 |
| Green Door Holidays Limited | Real estate | 2019 |
| Greengens&R Limited | Manufacturing | 2020 |
| Greengenuk Limited | Construction | 2011 |
| Grid and Glow Ltd | Construction | 2025 |
| Grogrid Ltd | Professional & scientific | 2025 |
| Groundtech SW Limited | Construction | 2016 |
| Groves & Brown Limited | Administrative & support | 2002 |
| Gryphon Computer Support Ltd | Information & communication | 1994 |
| GSG Tutors Limited | Education | 2014 |
| Gweal Wollas Fields Management Company Limited | Households | 2006 |
| Gwealdues Court Management Company Ltd | Households | 2018 |
| Gweek Village Stores Limited | Wholesale & retail | 2022 |
| Gwel Meneth Management Company Limited | Households | 1998 |
| Gwendreath Holiday Park Limited | Hospitality | 2019 |
| Gwinva Ltd | Information & communication | 2025 |
| Gylly Adventures Activity Centre Ltd | Arts & recreation | 2015 |
| H&H Power and Control Ltd | Manufacturing | 2014 |
| H.R.Lyne & SON Limited | Agriculture & fishing | 1963 |
| Hands Across the Sea Samplers Limited | Information & communication | 2019 |
| Hanig Limited | Construction | 2023 |
| Harbour View Cafe Limited | Hospitality | 2019 |
| Harford Marine Ltd | Agriculture & fishing | 2024 |
| Harrisagri Ltd | Agriculture & fishing | 2016 |
| Harvey’S Holdings Limited | Hospitality | 2023 |
| Hattons (Mullion) Limited | Wholesale & retail | 2005 |
| Haulrelief Ltd | Transport & logistics | 2025 |
| Hawk Stoves Limited | Manufacturing | 2006 |
| Headland Hearing Ltd | Health & social care | 2020 |
| Heather Bell Honey Bees Limited | Agriculture & fishing | 2019 |
| Heather Davis Ltd | Education | 2016 |
| Heatline (Cornwall) Limited | Construction | 2023 |
| Helfire Ltd | Professional & scientific | 2015 |
| Helford Geoscience LLP | | 2007 |
| Helgar Limited | Hospitality | 2019 |
| Helston (Cornwall) CIC | Other services | 2018 |
| Helston Barber 2 Ltd | Other services | 2026 |
| Helston Barber Ltd | Other services | 2025 |
| Helston Construction Limited | Construction | 2008 |
| Helston Fabrications Limited | Manufacturing | 1988 |
| Helston Grill Limited | Hospitality | 2016 |
| Helston Home Hardware Limited | Wholesale & retail | 2015 |
| Helston Kebab Ltd | Hospitality | 2025 |
| Helston Limited | Real estate | 2006 |
| Helston Motor Company Limited | Wholesale & retail | 2026 |
| Helston Railway Company Limited | Transport & logistics | 2006 |
| Helston Railway Preservation Company Limited | Transport & logistics | 2006 |
| Helston Railway Services CIC | Transport & logistics | 2025 |
| Helston Turkish Barber Ltd | Other services | 2023 |
| HELSTON13 Ltd | Manufacturing | 2026 |
| Henderson Fletcher Yachts Ltd | Manufacturing | 2018 |
| Henderson Mines Research Ltd | Administrative & support | 2007 |
| Hendy Developments Ltd | Construction | 2016 |
| Henry Cowls & SON Limited | Manufacturing | 2009 |
| Henry's Campsite Limited | Hospitality | 2016 |
| Heritage Farm & Kitchen Ltd | Agriculture & fishing | 2026 |
| HH Ecommerce Ltd | Wholesale & retail | 2024 |
| Hidden Orchard Ltd | Manufacturing | 2019 |
| HIG Empires Ltd | Wholesale & retail | 2026 |
| Highcross Developments (SW) Limited | Construction | 2022 |
| Highcross Management (Falmouth) Limited | Households | 2023 |
| Hodsolutions Ltd | Professional & scientific | 2025 |
| HOG House Animal Feeds Limited | Wholesale & retail | 2015 |
| Hollands & Long Limited | Construction | 2004 |
| Holmwood Leisure Parks Limited | Extraterritorial | 2008 |
| Home Cornwall Limited | Real estate | 2013 |
| Hoskin Plumbing & Heating Ltd | Construction | 2020 |
| House of VEG Limited | Real estate | 2022 |
| Housel Bay Ltd | Hospitality | 2018 |
| Hudson Rose Property Management Limited | Real estate | 2026 |
| Hudsons Model Car Company Ltd | Manufacturing | 2014 |
| Huju Limited | Manufacturing | 2022 |
| Hydrogen Boat Centre Limited | Transport & logistics | 2023 |