| Greens (Cornwall) Limited | Agriculture & fishing | 2009 |
| Greenstick Limited | Wholesale & retail | 2016 |
| Greyfriars Residents Association Limited | Households | 1999 |
| Griffco Holdings Limited | Real estate | 2026 |
| Griselinia R US Ltd | Agriculture & fishing | 2022 |
| Groovy Phoenix C.I.C. | Hospitality | 2025 |
| Grove Investment Group Holdings Limited | Financial services | 2024 |
| Grove Investment Group Limited | Real estate | 2024 |
| Grpro Limited | Manufacturing | 2008 |
| Grumpy Holdings Limited | Financial services | 2026 |
| GS Auto Service Ltd | Wholesale & retail | 2023 |
| GT Glassmasters Limited | Construction | 2015 |
| Guanchitas Limited | Manufacturing | 2024 |
| Gundry Stone Limited | Professional & scientific | 2014 |
| Gutierrez Investments Limited | Real estate | 2026 |
| Gweal Pawl (Management Company) Ltd. | Real estate | 2004 |
| Gwel an MOR Residents Company Limited | Real estate | 2002 |
| Gwella Contracting Services Ltd | Water & waste | 2020 |
| Gwella Property Limited | Real estate | 2025 |
| Gwenen Contracting Ltd | Administrative & support | 2024 |
| Gwruthyl Ltd | Construction | 2019 |
| Gyllyngdune Manor Management Company Limited | Households | 2010 |
| H Bell Construction Ltd | Construction | 2024 |
| H Harwood Ltd | Wholesale & retail | 2018 |
| Hager VOR Surf Co Ltd | Wholesale & retail | 1998 |
| Halo Childcare Cornwall Limited | Health & social care | 2022 |
| Handsfree (UK) Limited | Administrative & support | 2014 |
| Happy Clutter Free Ltd | Administrative & support | 2024 |
| Harbour Wealth Management Ltd | Financial services | 2019 |
| Harcharan Limited | Wholesale & retail | 2022 |
| Hardmetal Engineering (Cornwall) Limited | Manufacturing | 2003 |
| Harmonia - Women's Wellbeing Centre C.I.C. | Other services | 2025 |
| Harmony Permaculture Ltd | Education | 2021 |
| Harrison Crewes Properties Ltd | Construction | 2024 |
| Hart Property Cornwall Ltd | Real estate | 2023 |
| Hart's Haulage Limited | Transport & logistics | 2003 |
| Hart's Plant Hire Limited | Construction | 2013 |
| Hasslefree Upvc Limited | Construction | 2003 |
| HAY Energy Ltd. | Energy | 2012 |
| Hayle Launderette Limited | Other services | 2024 |
| Headforwards Fibrepark Limited | Administrative & support | 2023 |
| Headforwards Solutions Ltd | Information & communication | 2011 |
| Headway Cornwall | Health & social care | 2010 |
| Headz UP Limited | Other services | 2010 |
| Health Tech Solutions Ltd. | Health & social care | 2014 |
| Heartlands Furniture | Wholesale & retail | 2013 |
| Heartlands Training Limited | Education | 2015 |
| Heath & Arnold Holdings Limited | Financial services | 2008 |
| Heath & Arnold Limited | Construction | 1973 |
| Helford Atlantic Limited | Real estate | 2002 |
| Helping Hands Accountancy CIC | Financial services | 2024 |
| Hendra Heights Management Company Limited | Households | 2017 |
| HEP Diagnostics Limited | Professional & scientific | 2010 |
| Hermes Road Management Limited | Households | 1992 |
| HFC Mgmt Limited | Extraterritorial | 2020 |
| HGA Holdings Ltd | Real estate | 2023 |
| Higherfore Street Management Company Limited | Hospitality | 2007 |
| Highgrove and Osborn Gardens Management Company Ltd | Households | 2017 |
| Hillside Legal Limited | Professional & scientific | 2024 |
| Hoffmann Haulage Ltd | Transport & logistics | 2020 |
| Holman Park Management Company Limited | Households | 2007 |
| Holsworthy Management Company Limited | Households | 2007 |
| Home and Heating Ltd | Wholesale & retail | 2014 |
| Home Ease Bathrooms Ltd | Construction | 2026 |
| Home Safe Surveyors Ltd | Real estate | 2023 |
| Homefield Park Management (Portreath) Limited | Households | 2011 |
| Homeline Properties Limited | Households | 1982 |
| Homes for Cornwall C.I.C. | Other services | 2026 |
| Honey Bugs Cornwall Ltd. | Other services | 2018 |
| Honeywell-Watkins Limited | Hospitality | 2017 |
| Howell Technology Ltd | Information & communication | 2025 |
| Huckleberry Homes & Leisure Limited | Hospitality | 2013 |
| Huge Ideaz Limited | Professional & scientific | 2012 |
| Hummingbird Holidays Ltd | Hospitality | 2025 |
| Hunters Homes (Cornwall) Limited | Construction | 2016 |
| Hydro-Gas Ltd | Construction | 2025 |
| I J Hodges Limited | Construction | 2010 |
| ICT4 Limited | Information & communication | 2012 |
| Idlewilde Property Limited | Real estate | 2025 |
| Ignis Design Studio Limited | Professional & scientific | 2023 |
| Ignite Mechanical Electrical Solutions Ltd | Construction | 2024 |
| Igniteyou CIC | Hospitality | 2017 |
| IJ70 Ltd | Financial services | 2025 |
| Ilavenil Limited | Wholesale & retail | 2024 |
| Illogan Storage Ltd | Transport & logistics | 2018 |
| Illogan Tandoori Limited | Hospitality | 2026 |
| Illuminated Development Limited | Professional & scientific | 2020 |
| Ilmo Limited | Hospitality | 2014 |
| Impact Trade Finishing Ltd | Manufacturing | 2017 |
| IN Steel (Blacksmiths & Fabricators) Limited | Manufacturing | 2000 |
| IN Touch Physiotherapy Limited | Other services | 2019 |
| Incoondor Ltd | Wholesale & retail | 2019 |
| Indidog Ltd | Hospitality | 2018 |
| Indmec Limited | Wholesale & retail | 2010 |
| Industry 5.0 Associates Limited | Professional & scientific | 2024 |
| Inn Angarrack Limited | Hospitality | 2014 |
| Inn Cornwall Limited | Hospitality | 2010 |
| Inn-Genius Limited | Professional & scientific | 1994 |
| Inns of Cornwall Ltd | Hospitality | 2024 |
| Inovaa Ltd | Construction | 2016 |