| Chiropractic Health and Fitness Limited | Health & social care | 2011 |
| Chivers & Co Cornwall Ltd | Construction | 2019 |
| Chiverton Arms Limited | Hospitality | 2010 |
| CHK Education Limited | Administrative & support | 2023 |
| Choudhury Property Services Limited | Real estate | 2026 |
| Chrirobians Limited | Construction | 2013 |
| Chris Bailey Heating Ltd | Construction | 2018 |
| Chris Povey Pianos Ltd | Transport & logistics | 2026 |
| Christalys Services Ltd. | Professional & scientific | 2017 |
| Christine ANN Gilbert Limited | Extraterritorial | 2025 |
| Christine's Court Management Company Limited | Households | 2025 |
| Christopher Ellis and SON Limited | Manufacturing | 2006 |
| Christopherj Rowe and Associates Limited | Financial services | 2012 |
| CHROMA24 Productions Ltd | Extraterritorial | 2003 |
| Chronicle Global Ltd | Professional & scientific | 2024 |
| Chronologi Ltd | Professional & scientific | 2012 |
| CHS Tactical Ltd | Manufacturing | 2020 |
| Chuckles Nurseries Limited | Education | 2003 |
| Church Lane (Cheriton Bishop) Management Company Limited | Households | 2025 |
| Church Walk Management Company (Redruth) Limited | Households | 2003 |
| Churchill Construction SW Ltd | Construction | 2025 |
| CHY Developments Ltd | Construction | 2014 |
| Chy-An-Towans Limited | Health & social care | 2010 |
| Chymedden RTM Company Limited | Households | 2008 |
| Chynoweth View (Cubert) Property Management Company Limited | Households | 2018 |
| Chyreen Fruit Farm Limited | Agriculture & fishing | 2002 |
| Chytek Limited | Hospitality | 2007 |
| Chyverton Estate Company Limited | Agriculture & fishing | 1946 |
| Chyvogue Homes Limited | Construction | 2018 |
| Cilerwisg Farm LLP | | 2013 |
| Circus Dental Limited | Health & social care | 2019 |
| Circus Education Ltd | Education | 2021 |
| Circus Healthcare Limited | Financial services | 2025 |
| City Heat Limited | | 1986 |
| City of Lights Community Celebrations Community Interest Company | Arts & recreation | 2012 |
| City Road Veterinary Centre Limited | Professional & scientific | 2012 |
| City Solar South West Limited | Extraterritorial | 2008 |
| Cj's Luxury Florist Limited | Wholesale & retail | 2025 |
| CL Centre Ltd | Wholesale & retail | 2016 |
| CL Electrical (SW) Ltd | Construction | 2019 |
| Claessen Limited | Administrative & support | 2000 |
| Clairdew Limited | Real estate | 1984 |
| Clarke Carpentry & Construction Limited | Construction | 2022 |
| Classic Sailing Limited | Transport & logistics | 1996 |
| Claude Holman Cars Limited | Wholesale & retail | 1997 |
| Clay Country Trailer Hire Limited | Transport & logistics | 2019 |
| Clear CUT Carpentry & Woodworks Ltd | Manufacturing | 2025 |
| Clear Home Improvements Limited | Construction | 2018 |
| Clearvalley Construction Limited | Construction | 2004 |
| Clearvent Holdings Ltd | Construction | 2020 |
| Clearway Carpentry Limited | Construction | 2010 |
| Clemo Collective Ltd | Real estate | 2023 |
| Clifden Gate Management Company Limited | Households | 2008 |
| Cliff and Ocean Ltd | Professional & scientific | 2018 |
| Cliff Edge Management Company Limited | Households | 2020 |
| Cliff Edge Rentals (APT 21) Ltd | Real estate | 2022 |
| Cliff Edge Rentals (APT 24) Ltd | Real estate | 2022 |
| Cliff Edge Rentals (APT 3) Ltd | Real estate | 2022 |
| Cliff Edge Rentals (APT 36) Ltd | Real estate | 2022 |
| Cliff Edge Rentals (APT 37) Ltd | Real estate | 2022 |
| Cliff Edge Rentals (APT 39) Ltd | Real estate | 2022 |
| Cliff Edge Rentals (APT 8) Ltd | Real estate | 2022 |
| Cliffedge Holdings Ltd | Real estate | 2024 |
| Clifton Gardens Residents Association | Households | 2023 |
| Climate Vision Limited | Professional & scientific | 2011 |
| Climbing Tree Books Limited | Information & communication | 2012 |
| Clipper Cove Management Company Limited | Households | 2006 |
| Clique Barbershop Ltd | Other services | 2018 |
| Clique Customs Ltd | Wholesale & retail | 2017 |
| Clive Mitchell Cycles Limited | Wholesale & retail | 2018 |
| Cloud Nine Group Limited | Households | 2024 |
| Cloudtag Ltd | Information & communication | 2023 |
| Clove Essence Limited | Health & social care | 2018 |
| Clovis Yacht Limited Liability Partnership | | 2002 |
| CM Builds SW Ltd | Construction | 2025 |
| CM Groundworks Limited | Construction | 2016 |
| Cmo'Dwyer Ltd | Health & social care | 2024 |
| Cnnct Ltd | Professional & scientific | 2015 |
| CNV Motor Services Ltd | Wholesale & retail | 2016 |
| CNX Thai Limited | Hospitality | 2019 |
| Coalition Brands Limited | Administrative & support | 2020 |
| Coast and Country Crafts Ltd | Wholesale & retail | 2026 |
| Coast Cleaning Limited | Administrative & support | 2021 |
| Coast to Coast Financial Planning Services Limited | Financial services | 1996 |
| COAST2COAST Maintenance and Valeting Ltd | Wholesale & retail | 2020 |
| Coastal Building, Carpentry & Joinery Ltd | Construction | 2008 |
| Coastal Laundry Engineering Ltd | Manufacturing | 2026 |
| Coastguards Cottages Freehold Limited | Real estate | 2018 |
| Coastline Court Management Company Limited | Households | 1992 |
| Coastside Engineering Services Ltd | Manufacturing | 2023 |
| Cobbs Well House Management Company Limited | Households | 2018 |
| Cobit South West Limited | Information & communication | 2008 |
| Cockrams Surveyors Limited | Administrative & support | 2013 |
| Codal Fencing Southwest Ltd | Construction | 2023 |
| Code 7 Consulting Limited | Professional & scientific | 2011 |
| Coffee POT Enterprises Limited | Real estate | 2002 |
| Coffeebean Trading Ltd | Hospitality | 2024 |
| Coinage House Management Company Limited | Real estate | 2023 |
| Colateral Limited | Information & communication | 2015 |
| Colin Mcguirk Limited | Health & social care | 2019 |