| Cornish Frame Company Ltd | Manufacturing | 2025 |
| Cornish Fresh Ltd | Wholesale & retail | 2004 |
| Cornish Hampers and Gifts Ltd | Hospitality | 2026 |
| Cornish HUE Ltd | Real estate | 2025 |
| Cornish Landscaper Ltd | Administrative & support | 2016 |
| Cornish Liquid Minerals Limited | Manufacturing | 2020 |
| Cornish Luggage Transfers Limited | Transport & logistics | 2014 |
| Cornish Luxury LET Care Ltd | Real estate | 2025 |
| Cornish Marine Ltd | Wholesale & retail | 2019 |
| Cornish Originals CIC | Other services | 2024 |
| Cornish Quarries Limited | Manufacturing | 1988 |
| Cornish Rural Retreats Limited | Extraterritorial | 2024 |
| Cornish Sea Bass Ltd | Agriculture & fishing | 2023 |
| Cornish Seascape Holidays Ltd | Hospitality | 2024 |
| Cornish Stone Products Ltd | Professional & scientific | 2007 |
| Cornish Wave Limited | Administrative & support | 2020 |
| Cornishcoastcleaningservicesltd Ltd | Administrative & support | 2025 |
| Cornishon Limited | Hospitality | 2021 |
| Cornwall Air Ambulance Trust | Administrative & support | 2009 |
| Cornwall and Devon Land Rover Club Limited | Arts & recreation | 1986 |
| Cornwall Based Dispensaries Ltd | Wholesale & retail | 2019 |
| Cornwall Bird Watching & Preservation Society | Other services | 2011 |
| Cornwall Brickwork Services Ltd | Construction | 2019 |
| Cornwall Car Hire Limited | Administrative & support | 2014 |
| Cornwall Cleaning and Property Management Ltd | Administrative & support | 2022 |
| Cornwall Contracting Ltd | Construction | 2014 |
| Cornwall Conversions Ltd | Construction | 2025 |
| Cornwall Data Access Limited | Information & communication | 2014 |
| Cornwall Dental Hygiene and Therapy Limited | Health & social care | 2025 |
| Cornwall Dental Hygiene Services Ltd | Health & social care | 2025 |
| Cornwall Door and Window Repair Ltd | Construction | 2025 |
| Cornwall Extensions New Builds Ltd | Construction | 2023 |
| Cornwall Fencing Limited | Manufacturing | 2014 |
| Cornwall Finance and Investment Services Limited | Financial services | 2012 |
| Cornwall Fleet Solutions Ltd | Construction | 2019 |
| Cornwall Gifts Ltd | Wholesale & retail | 2026 |
| Cornwall Health Ltd | Health & social care | 2023 |
| Cornwall Holiday Home Management Ltd | Administrative & support | 2021 |
| Cornwall Holmes Property Ltd | Real estate | 2025 |
| Cornwall Home Care Limited | Health & social care | 2023 |
| Cornwall Hose and Hydraulics Ltd | Manufacturing | 2024 |
| Cornwall Keys Ltd | Other services | 2026 |
| Cornwall Laser Limited | Other services | 2025 |
| Cornwall Loft Conversions Limited | Construction | 2017 |
| Cornwall Moto Supply Ltd | Wholesale & retail | 2026 |
| Cornwall Padel Club Ltd | Arts & recreation | 2026 |
| Cornwall Property Developments Ltd | Construction | 2020 |
| Cornwall Refrigeration Solutions Ltd | Manufacturing | 2012 |
| Cornwall Retrofit Ltd | Professional & scientific | 2024 |
| Cornwall Saracens Basketball CIC | Education | 2023 |
| Cornwall Touring Park Limited | Hospitality | 2014 |
| Cornwall Travel Ltd | Wholesale & retail | 2025 |
| Cornwall Yoga Ltd | Arts & recreation | 2022 |
| Cosmos Currency Exchange Ltd | Financial services | 2020 |
| Coswarth Farm Limited | Agriculture & fishing | 2012 |
| Cosyhome Stoves Ltd | Construction | 2011 |
| Country COW Designs Limited | Manufacturing | 2021 |
| Cove Digital Marketing Ltd | Professional & scientific | 2025 |
| Coverack Ventures Ltd | Financial services | 2022 |
| Covid 19 Recovery Investments Ltd | Financial services | 2020 |
| Cozz & Blaine Ltd | Wholesale & retail | 2025 |
| CPM Cornwall Ltd | Other services | 2019 |
| Cpowers Electrical Ltd | Construction | 2025 |
| Crantock Construction Services (CCS) Limited | Construction | 2015 |
| Crantock Farmers Market Ltd | Administrative & support | 2026 |
| Crantock Lodge Limited | Health & social care | 2019 |
| Crantock Plains Caravan Storage Limited | Hospitality | 2017 |
| Crantock Properties Ltd | Construction | 2017 |
| Crantock Street Community Garden CIC | Arts & recreation | 2025 |
| Crantock Village Stores Ltd | Wholesale & retail | 2014 |
| Creative Robyn Limited | Hospitality | 2024 |
| Creators Foundry Ltd | Manufacturing | 2025 |
| Creatures of Detail Ltd. | Extraterritorial | 2016 |
| Crescent Rentals Ltd | Hospitality | 2024 |
| Crest Construction Cornwall Limited | Administrative & support | 2019 |
| Crib and Croust Limited | Manufacturing | 2019 |
| Cribbar Construction Ltd | Construction | 2025 |
| Cribbar Limited | Wholesale & retail | 2003 |
| Cribbar Motors Ltd | Wholesale & retail | 2025 |
| Cross-Shore Medical Ltd | Health & social care | 2025 |
| Crossfit Newquay Ltd | Arts & recreation | 2016 |
| Crownsway Offlicence Ltd | Wholesale & retail | 2015 |
| Crucible Care | Manufacturing | 2005 |
| Crumbles Cornwall Ltd | Wholesale & retail | 2024 |
| Crystal Blue Adventures CIC | Arts & recreation | 2024 |
| CS Aviation Services Ltd | Manufacturing | 2025 |
| Cssg Paint Maintenance Ltd | Construction | 2021 |
| Cuprite Limited | Real estate | 2014 |
| CXO & Co UK Ltd | Administrative & support | 2026 |
| CXT Electrical Solutions Ltd | Construction | 2025 |
| Cybarpunk Limited | Transport & logistics | 2020 |
| Cybernetic Witch Cult Ltd | Wholesale & retail | 2020 |
| Cyberstein Robotics Ltd | Professional & scientific | 2006 |
| D & T Brickwork Ltd | Construction | 2024 |
| D J Woodgate Engineering Ltd | Professional & scientific | 2016 |
| D R East Limited | Construction | 2003 |
| D W Blatchford Limited | Financial services | 2011 |
| D.A.M. Newquay Limited | Transport & logistics | 2014 |
| Daiisy Interiors Ltd | Wholesale & retail | 2024 |
| Daisy Cottage Folkestone Limited | Hospitality | 2025 |