| Cornwall Arts Restaurant Limited | Hospitality | 2012 |
| Cornwall Association of Tourist Attractions | Other services | 2020 |
| Cornwall Autism Limited | Health & social care | 2020 |
| Cornwall Blasting Ltd | Professional & scientific | 2025 |
| Cornwall Boat Parts Limited | Wholesale & retail | 1994 |
| Cornwall Business Show Limited | Administrative & support | 2012 |
| Cornwall Carpentry & Flat Roofing Ltd | Manufacturing | 2021 |
| Cornwall Cider Co. Limited | Manufacturing | 2013 |
| Cornwall Climate Action Network CIC | Administrative & support | 2022 |
| Cornwall Commercials Ltd | Other services | 2017 |
| Cornwall Composites Limited | Manufacturing | 2022 |
| Cornwall Computers and Tech CIC | Water & waste | 2026 |
| Cornwall Countryside Supplies Limited | Agriculture & fishing | 2009 |
| Cornwall Crafts Association | Other services | 2013 |
| Cornwall Cricket Board Limited | Arts & recreation | 2011 |
| Cornwall Development Company Ltd | Extraterritorial | 1998 |
| Cornwall EAR Care Clinic Ltd | Education | 2026 |
| Cornwall Environmental Consultants Limited | Professional & scientific | 1991 |
| Cornwall Event Cabins Limited | Wholesale & retail | 2023 |
| Cornwall Eventing Academy CIC | Education | 2024 |
| Cornwall EYE Consultant Ltd | Health & social care | 2015 |
| Cornwall EYE Services Limited | Health & social care | 2019 |
| Cornwall Farm Machinery Limited | Wholesale & retail | 2010 |
| Cornwall Ferries Limited | Transport & logistics | 2003 |
| Cornwall Flooring & Home Ltd | Wholesale & retail | 2016 |
| Cornwall Food and Drink Limited | Professional & scientific | 2010 |
| Cornwall Garage Door Centre Limited | Construction | 2002 |
| Cornwall Glass & Glazing Limited | Wholesale & retail | 2012 |
| Cornwall Glass (Manufacturing) Limited | Manufacturing | 2013 |
| Cornwall Golf Limited | Arts & recreation | 2026 |
| Cornwall Group Limited | Wholesale & retail | 1998 |
| Cornwall Haematology Ltd | Health & social care | 2024 |
| Cornwall Home Show Limited | Administrative & support | 2010 |
| Cornwall Home Stagers Ltd | Other services | 2026 |
| Cornwall Homes & Developments Limited | Real estate | 2024 |
| Cornwall Homeseekers Ltd | Real estate | 1997 |
| Cornwall Hospitality Collective CIC | Other services | 2023 |
| Cornwall Housing Limited | Real estate | 2003 |
| Cornwall IVF Limited | Health & social care | 2005 |
| Cornwall Laser Specialists Ltd. | Other services | 2018 |
| Cornwall Laundry and Linen Hire Ltd | Other services | 2024 |
| Cornwall Leisure Ltd | Hospitality | 2019 |
| Cornwall Lifestyle Limited | Agriculture & fishing | 2014 |
| Cornwall Living Lets Ltd | Real estate | 2024 |
| Cornwall Living Ltd | Real estate | 2020 |
| Cornwall Maintenance Services Limited | Construction | 2020 |
| Cornwall Manufacturers Group Limited | Other services | 2018 |
| Cornwall Medical Contracting Ltd | Public administration | 2021 |
| Cornwall Medical Group Limited | Health & social care | 2021 |
| Cornwall Mining and Geo-Resources Alliance Ltd | Other services | 2025 |
| Cornwall Montessori Ltd | Education | 2021 |
| Cornwall Neurology Limited | Health & social care | 2024 |
| Cornwall Nurseries Limited | Education | 2023 |
| Cornwall OUT of Hours Services Limited | Professional & scientific | 2007 |
| Cornwall Payroll Ltd | Professional & scientific | 2016 |
| Cornwall Refinishing Ltd | Construction | 2024 |
| Cornwall Renewable Energy Ltd | Construction | 2024 |
| Cornwall Residential Landlords Association | Information & communication | 2005 |
| Cornwall Rugby Referees Society | Arts & recreation | 2011 |
| Cornwall Safety Services Limited | Professional & scientific | 2024 |
| Cornwall Scaffolding Ltd | Construction | 2014 |
| Cornwall Self Storage Ltd | Transport & logistics | 2025 |
| Cornwall Stonemasonry Ltd | Manufacturing | 2020 |
| Cornwall Tattoo Convention Ltd | Arts & recreation | 2019 |
| Cornwall Therapy Hub CIC | Education | 2026 |
| Cornwall Timber Frames Limited | Construction | 1983 |
| Cornwall Timber Framing Ltd | Manufacturing | 2017 |
| Cornwall Transport Hub Ltd | Transport & logistics | 2025 |
| Cornwall Tree Services Ltd | Agriculture & fishing | 2024 |
| Cornwall Vein Clinic Limited | Health & social care | 2016 |
| Cornwall Vending Ltd | Wholesale & retail | 2019 |
| Cornwall Vision Care Ltd | Health & social care | 2019 |
| Cornwall Warehousing Limited | Transport & logistics | 2025 |
| Cornwall Waste Care Ltd. | Water & waste | 2018 |
| Cornwall Wi-Fi Services Limited | Construction | 2022 |
| Cornwall Wildlife Trust | Education | 1962 |
| Cornwall Women of Colour Collective CIC | Education | 2026 |
| Cornwall.Tv Limited | Information & communication | 2013 |
| Cornwallis Management Company Limited | Administrative & support | 2003 |
| Cornwalls Laser Training Academy Ltd | Other services | 2025 |
| Cortez Holdings Limited | Financial services | 2021 |
| Cosawes Park Ltd | Hospitality | 1964 |
| Cosmic Connections Ltd | Administrative & support | 2025 |
| Cottingham Holiday Cottages Limited | Hospitality | 2026 |
| Cotton Mills Cornwall Limited | Wholesale & retail | 2010 |
| Cougar Internal Mail Ltd | Administrative & support | 2011 |
| Counter Construction Ltd | Construction | 2025 |
| Counterball Ltd | Other services | 2016 |
| Country Estate Supper Club Ltd | Agriculture & fishing | 2024 |
| Countryside Seeds Limited | Wholesale & retail | 2017 |
| Countrywide Inns UK Ltd | Hospitality | 2019 |
| County Electrical Limited | Wholesale & retail | 2007 |
| County Homesearch International Limited | Administrative & support | 1997 |
| Courtney Marie Photography Ltd | Professional & scientific | 2022 |
| Cove Cafe Kernow Ltd | Hospitality | 2023 |
| Coversa Ltd | Administrative & support | 2025 |
| Cowgirls Stithians Ltd | Hospitality | 2025 |
| Cowling Plant Hire Ltd | Construction | 2017 |
| Coyte Farm Limited | Extraterritorial | 2012 |
| Crabb DMC Ltd | Construction | 2021 |