| Connell Studios Ltd | Information & communication | 2017 |
| Construct Engineers Ltd | Professional & scientific | 2022 |
| Consult Easy Ltd | Professional & scientific | 2025 |
| Contract Sign Systems Limited | Manufacturing | 1991 |
| Control Print Limited | Manufacturing | 2003 |
| Convergex Connections Ltd | Administrative & support | 2023 |
| Conway Bailey Transport Limited | Transport & logistics | 2000 |
| Coppice Theatre Ltd | Arts & recreation | 2026 |
| COR Technologies Ltd | Manufacturing | 2018 |
| Coriander Indian Restaurant Limited | Hospitality | 2026 |
| Cormac Contracting Limited | Construction | 2011 |
| Cormac Solutions Limited | Extraterritorial | 2023 |
| Cornish Ancestry Ltd | Information & communication | 2014 |
| Cornish Breaks Limited | Hospitality | 2010 |
| Cornish Changeovers Ltd | Agriculture & fishing | 2021 |
| Cornish Coastline Ltd | Manufacturing | 2021 |
| Cornish Coffee Co. Limited | Wholesale & retail | 1995 |
| Cornish Cracking Eggs Ltd | Agriculture & fishing | 2025 |
| Cornish Custom Homes Ltd | Construction | 2026 |
| Cornish Developers Limited | Construction | 2023 |
| Cornish Epos and IT Services Ltd | Wholesale & retail | 2011 |
| Cornish Holdings Ltd | Mining & quarrying | 2024 |
| Cornish Liquids Ltd | Manufacturing | 2015 |
| Cornish Purl Ltd | Wholesale & retail | 2025 |
| Cornish Sunset Holidays Ltd | Hospitality | 2022 |
| Cornubianart Limited | Manufacturing | 2021 |
| Cornwall Aerial Guys Ltd | Wholesale & retail | 2018 |
| Cornwall Bespoke Joinery Ltd | Manufacturing | 2026 |
| Cornwall Bike Training Ltd | Education | 2020 |
| Cornwall Biomass Ltd | Wholesale & retail | 2013 |
| Cornwall Build Ltd | Construction | 2025 |
| Cornwall Business Collective Ltd | Administrative & support | 2025 |
| Cornwall Business Finance Ltd | Professional & scientific | 2011 |
| Cornwall Caravan Centre Limited | Wholesale & retail | 2006 |
| Cornwall Care Services 2026 Limited | Health & social care | 2026 |
| Cornwall Centre for Culture and the Arts C.I.C. | Education | 2020 |
| Cornwall Chimney Services Ltd | Administrative & support | 2020 |
| Cornwall Community Accountancy Service | Professional & scientific | 2012 |
| Cornwall Construction and Developments Ltd | Manufacturing | 2023 |
| Cornwall Cullet Limited | Water & waste | 2009 |
| Cornwall Decorators Ltd | Construction | 2018 |
| Cornwall Delivery Ltd | Transport & logistics | 2024 |
| Cornwall Entertainment Limited | Other services | 2015 |
| Cornwall Field Agency Ltd | Administrative & support | 2026 |
| Cornwall Food Partnership CIC | Professional & scientific | 2023 |
| Cornwall Funeral Services Ltd | Administrative & support | 2015 |
| Cornwall Garden Landscaping Ltd | Administrative & support | 2023 |
| Cornwall Gems Ltd | Manufacturing | 2023 |
| Cornwall Granite and Slate Limited | Wholesale & retail | 2011 |
| Cornwall Granite Limited | Wholesale & retail | 2011 |
| Cornwall Health Care Services Ltd | Other services | 2021 |
| Cornwall Heating Contractors Ltd | Construction | 2020 |
| Cornwall Heritage Trust Limited(The) | Arts & recreation | 1985 |
| Cornwall Hospitality Ltd | Professional & scientific | 2021 |
| Cornwall Infant Feeding CIC | Health & social care | 2026 |
| Cornwall Kawasaki Centre Limited | Wholesale & retail | 2022 |
| Cornwall Legal Centre CIC | Professional & scientific | 2024 |
| Cornwall LPG Ltd | Wholesale & retail | 2014 |
| Cornwall Media Resource Limited | Arts & recreation | 1997 |
| Cornwall Neighbourhoods for Change Limited | Administrative & support | 2001 |
| Cornwall Partners in Care Limited | Health & social care | 2011 |
| Cornwall Special Needs Taekwondo C.I.C. | Arts & recreation | 2021 |
| Cornwall Sports Tours Limited | Arts & recreation | 2025 |
| Cornwall VIP Barbers Ltd | Other services | 2023 |
| Cornwall Voluntary Sector Forum | Professional & scientific | 2005 |
| Cornwall Wood Treatments Services Limited | Manufacturing | 1987 |
| Cornwall Woodburners Ltd | Construction | 2015 |
| Cornwallpattesting Ltd | Professional & scientific | 2025 |
| Corserv Care Limited | Public administration | 2020 |
| Corserv Contracting Limited | Extraterritorial | 2023 |
| Corserv Facilities Limited | Real estate | 2019 |
| Corserv Limited | Professional & scientific | 2015 |
| Corserv Solutions Limited | Construction | 2011 |
| Countryside Cottages Ltd | Hospitality | 2021 |
| Countryside Enterprise 2024 Ltd | Households | 2024 |
| Courtney King Plant Hire Ltd | Construction | 2013 |
| Cowz Ltd | Administrative & support | 2014 |
| Cozy Corner Cafe Limited | Hospitality | 2026 |
| Create ME Time Ltd | Arts & recreation | 2018 |
| Create US Time Ltd | Arts & recreation | 2019 |
| Creation Eco-Clean Limited | Administrative & support | 2021 |
| Creative and Skint Ltd | Professional & scientific | 2022 |
| Creative Kernow Enterprises Limited | Information & communication | 2002 |
| Creative Kernow Limited | Education | 1983 |
| Creative Path 52 Limited | Information & communication | 2026 |
| Creative Sculpt Studio Ltd | Other services | 2018 |
| Creature Comforts (Cornwall) Ltd | Manufacturing | 2001 |
| Crescent Housing Limited | Hospitality | 2019 |
| Crofty Planning Ltd | Professional & scientific | 2020 |
| Crofty Primary Care Limited | Health & social care | 2022 |
| Crypto Accounting Limited | Professional & scientific | 2021 |
| Cuckoo Valley Limited | Hospitality | 2017 |
| Curie Scientific Limited | Wholesale & retail | 2023 |
| Curnow Consulting Limited | Professional & scientific | 2010 |
| Custom Services Southwest Ltd | Administrative & support | 2024 |
| D & M Cleaning Service Limited | Administrative & support | 2010 |
| D & R Electrical Installations Limited | Construction | 2014 |
| D M Orthotics Limited | Manufacturing | 2004 |
| D S Design (SW) Limited | Administrative & support | 2009 |
| D&R Concrete Limited | Construction | 2023 |