| Gapwise Limited | Education | 2014 |
| Garden Folk CIC | Arts & recreation | 2024 |
| Garden Geeks (UK) Ltd | Wholesale & retail | 2021 |
| Garden Geeks Ltd | Wholesale & retail | 2021 |
| Garsewednack Care Home Limited | Health & social care | 2015 |
| Gasworld.Com Limited | Information & communication | 2003 |
| GB Groundworks Southwest Limited | Construction | 2024 |
| GCE Connelly Ltd | Arts & recreation | 2012 |
| GD Dynamics Consulting Ltd | Information & communication | 2023 |
| Gecko Golf Ltd | Wholesale & retail | 2025 |
| Geddon Inns Limited | Hospitality | 2025 |
| Gelma Limited | Other services | 2017 |
| Gemini Management (Cornwall) Limited | Construction | 1989 |
| Gemzo Holdings Limited | Real estate | 2016 |
| Generation Minerals Ltd | Mining & quarrying | 2012 |
| Generation Resources PLC | Mining & quarrying | 2021 |
| GEO Medical Limited | Health & social care | 2022 |
| Geo-Environmental Recruitment Limited | Administrative & support | 2012 |
| Geodrone Survey Limited | Professional & scientific | 2016 |
| Geoform Groundworks Ltd | Construction | 2008 |
| George Butchers Ltd | Wholesale & retail | 2022 |
| Georges Business Ltd | Wholesale & retail | 2026 |
| Geoserve Solutions UK Limited | Information & communication | 2019 |
| Geoxplore Ltd | Professional & scientific | 2020 |
| Geraldine Lavery Associates Limited | Professional & scientific | 2013 |
| Get-Some Airsoft Ltd | Wholesale & retail | 2022 |
| GHS Administration Limited | Professional & scientific | 2000 |
| GHS International Limited | Health & social care | 2018 |
| Gibomarine (GML) Limited | Manufacturing | 2017 |
| Gillian Dickinson Ltd | Manufacturing | 2023 |
| Giraffe Equity Release Ltd | Financial services | 2017 |
| Girly Girl Ltd. | Construction | 2018 |
| GJP Groundworks Limited | Construction | 2024 |
| Glade Grimsby Limited | Real estate | 2026 |
| Glamping Tree Limited | Administrative & support | 2022 |
| Glassons Garage Limited | Wholesale & retail | 2019 |
| Glazing Waves CIC | Arts & recreation | 2024 |
| Glazing Waves Pottery Ltd | Wholesale & retail | 2023 |
| GLB Open-Sourcing Ltd | Wholesale & retail | 2022 |
| Glencross Estate Limited | Real estate | 2019 |
| Glenn Humphries Landscaping Limited | Administrative & support | 2006 |
| Glennek Building Contractors Limited | Construction | 2025 |
| Glenthorne Court (HD) Limited | Households | 2011 |
| Global Clinical Registry Limited | Health & social care | 2025 |
| Global Environment Centre - Europe | Professional & scientific | 1989 |
| Global Inhalation Equipment Limited | Manufacturing | 2013 |
| Global Trade Partners | | 2004 |
| Glorylilly Care Limited | Public administration | 2021 |
| Gloss Magazines Limited | Professional & scientific | 2014 |
| Glover Enterprises Limited Liability Partnership | | 2006 |
| Gloweth Barton Developments Limited | Construction | 2015 |
| Gloweth Barton Truro Ltd | Real estate | 2018 |
| Gloweth FC Limited | Hospitality | 2026 |
| Gloweth Limited | Construction | 1962 |
| GLT Medical Services Limited | Health & social care | 2024 |
| GLT Property Services Ltd | Professional & scientific | 2023 |
| GLV (SW) Ltd | Construction | 2020 |
| Glynn Estate Limited | Households | 2023 |
| Gobiiform Limited | Information & communication | 2023 |
| Godolphin View Management Company Limited | Households | 2006 |
| Godrevy Parc Management Company Limited | Real estate | 2018 |
| Golay Planning Ltd | Other services | 2018 |
| Gold Bird Hair Design Limited | Other services | 2017 |
| Gold Candle 33 UN Limited | Financial services | 2026 |
| Goldbirdhair Ltd | Other services | 2020 |
| Golden Tree Productions CIC | Education | 2007 |
| Goliath Communications Ltd | Information & communication | 2010 |
| Gonvena House Residents Association Limited | Households | 1989 |
| Good Gifts Ltd | Education | 2012 |
| Good Tuesday Ltd | Wholesale & retail | 2021 |
| Goodrich Group Ltd | Construction | 2025 |
| Goodrich Kelly Construction Ltd | Construction | 2025 |
| Goon Rinsey Meadows Management Company Limited | Households | 2022 |
| Goonhavern Electrical Limited | Construction | 2025 |
| Goonvrea Estate Management Company Limited | Real estate | 1991 |
| Gorse Cornwall Ltd | Wholesale & retail | 2021 |
| Grace Church, Truro | Other services | 2010 |
| Graces Court Ltd | Manufacturing | 2022 |
| Granite 3D Limited | Information & communication | 2023 |
| Grantley Gardens Management Company Limited | Households | 2007 |
| Grayson Studio Limited | Information & communication | 2026 |
| Graystone Financial Services Ltd | Financial services | 2009 |
| GRD Building Services Ltd | Construction | 2020 |
| GRD Letting & Development Ltd | Real estate | 2026 |
| Great Cornish Food Limited | Hospitality | 2015 |
| Great Cornish Food Store Limited | Wholesale & retail | 2016 |
| Great Cornish Food Trustee Limited | Professional & scientific | 2022 |
| Great Leisure Developments Ltd | Hospitality | 2020 |
| Great Leisure Group (UK) Limited | Hospitality | 2020 |
| Great Leisure Parks Ltd | Hospitality | 2020 |
| Great Steps International Limited | Wholesale & retail | 2019 |
| Great Western Project Limited | Construction | 2015 |
| Green Agent Limited | Professional & scientific | 2015 |
| Green COW Dairy Ltd | Manufacturing | 2019 |
| Green Hydrogen Intergrated Systems International Ltd | Manufacturing | 2022 |
| Green Sparks PAT Testing Limited | Construction | 2019 |
| Green Works Consulting Ltd | Professional & scientific | 2020 |
| Green-Claimeduk Ltd | Professional & scientific | 2025 |
| Greenbottom Limited | Construction | 2006 |
| Greenmeadow Cottages Goonhavern Management Limited | Households | 2015 |