| Cocoba Holdings Limited | Manufacturing | 2025 |
| Cocoba Limited | Manufacturing | 2010 |
| Cocoba Marketing Limited | Wholesale & retail | 2021 |
| Code 2 Events Consultancy Ltd | Administrative & support | 2024 |
| Codi Services Limited | Professional & scientific | 2024 |
| Codisan Limited | Hospitality | 2026 |
| Codner Builders Ltd | Construction | 2021 |
| Cofton Motors Limited | Wholesale & retail | 2008 |
| Cofton Motors Starcross Limited | Wholesale & retail | 2002 |
| Collage Consulting Limited | Information & communication | 1995 |
| Colledge Homes Limited | Construction | 2016 |
| Colour Calendars Ltd | Manufacturing | 2008 |
| Colvill Properties Limited | Administrative & support | 2015 |
| Combat Cleaning SW Limited | Administrative & support | 2013 |
| Comcat Engineering SW Ltd | Manufacturing | 2019 |
| Commercial Drone Training Education Limited | Education | 2016 |
| Commissioning HR Ltd | Administrative & support | 2015 |
| Committo Ltd | Administrative & support | 2018 |
| Commonfield Services Limited | Manufacturing | 1995 |
| Community Living SW CIC | Hospitality | 2023 |
| Community Support Team CIC | Education | 2012 |
| Company 7 Limited | Hospitality | 2020 |
| Compass Electrical Solutions (SW) Ltd | Construction | 2019 |
| Compass Finance Consultancy Limited | Professional & scientific | 2019 |
| Compass Medical Services Limited | Health & social care | 2006 |
| Compass Plumbing & Heating Solutions (SW) Ltd | Construction | 2018 |
| Compass Recruitment SW Ltd | Administrative & support | 2023 |
| Competition Phoenix Ltd | Arts & recreation | 2025 |
| Complete Electrical (SW) Ltd | Construction | 2023 |
| Complete Financial Services (SW) Ltd | Professional & scientific | 2025 |
| Complete Foodservice Limited | Extraterritorial | 2004 |
| Complete Restoration Services Ltd | Other services | 2013 |
| Complete Yoga Limited | Professional & scientific | 2006 |
| Completely Cured Ltd | Manufacturing | 2019 |
| Component Process and Repair Holdings Limited | Financial services | 2017 |
| Compton's Café CIC | Information & communication | 2026 |
| Compucare Computer Servicing Limited | Information & communication | 2001 |
| Conan Security Ltd | Administrative & support | 2023 |
| Concentrica Limited | Information & communication | 1998 |
| Concept Design (Leicester) Limited | Manufacturing | 1993 |
| Concept Events SW Limited | Arts & recreation | 2022 |
| Concept Fusion Ltd | Information & communication | 2020 |
| Concord Developments (Exeter) Ltd | Construction | 2023 |
| Confectionery Kitchen Limited | Wholesale & retail | 2016 |
| Confidence Health Solutions Limited | Professional & scientific | 2024 |
| Conhse Limited | Real estate | 2017 |
| Conjet Limited | Information & communication | 2018 |
| Connaught Road LLP | | 2008 |
| Connected Electrical Services Limited | Construction | 2016 |
| Conrad Copy Limited | Information & communication | 2013 |
| Consano Medical Ltd | Health & social care | 2023 |
| Conservation Without Borders Trading Limited | Administrative & support | 2021 |
| Consiliosa Limited | Information & communication | 2014 |
| Construction Contract Services (South West) Limited | Construction | 2012 |
| Construction Products UK Limited | Wholesale & retail | 2004 |
| Consulting Solutions Network Limited | Information & communication | 2015 |
| Consultra Ltd | Professional & scientific | 2024 |
| Contour Medical Aesthetics Academy Ltd | Education | 2024 |
| Contractor Voice Ltd | Professional & scientific | 2021 |
| Control Customs UK Ltd | Other services | 2018 |
| COO Partners LLP | | 2006 |
| Cooks Plumbing and Heating Limited | Construction | 2000 |
| Cool for Cats Limited | Agriculture & fishing | 2025 |
| Coombe Vale Garage Limited | Wholesale & retail | 2002 |
| Coombes 5* Cleaning Services Ltd | Administrative & support | 2022 |
| Coombeshead Tree Care Ltd | Agriculture & fishing | 2020 |
| Coop Brand Ltd | Information & communication | 2016 |
| Copperthorn Projects Ltd | Professional & scientific | 2022 |
| Coproduce Healthcare Ltd | Health & social care | 2025 |
| Coralwharf Limited | Hospitality | 2000 |
| Corbyn Homes Limited | Construction | 2011 |
| Core AV Solutions Ltd | Construction | 2022 |
| Core Electrics (SW) Limited | Construction | 2024 |
| Corner Stone (Newton Abbot) Limited | Construction | 2007 |
| Cornish Chough Management Limited | Real estate | 2015 |
| Cornish Maritime Services Limited | Administrative & support | 2012 |
| Cornish Seafood Company Limited | Extraterritorial | 2006 |
| Cornwall Fuels Limited | Extraterritorial | 2013 |
| Corrosion Management Ltd | Professional & scientific | 2021 |
| Cosgraves Limited | Agriculture & fishing | 1999 |
| Coslec Electrical Services Ltd | Construction | 2020 |
| Cosmetic Surgery in Essex Limited | Health & social care | 2009 |
| Cottson Ltd | Construction | 2018 |
| Country & Coastal Interiors Limited | Professional & scientific | 2013 |
| Countrywide Hotels a Ltd | Hospitality | 2021 |
| Countrywide Hotels Investments Limited | Real estate | 2016 |
| Countrywide Hotels Limited | Hospitality | 2014 |
| County Cleansing Limited | Water & waste | 2003 |
| Couper Meadows Limited | Real estate | 2022 |
| Courageous Life LLP | | 2013 |
| Courier Fleet Limited | Transport & logistics | 2010 |
| Court Farm Barn (Abbotskerswell) Management Limited | Hospitality | 1994 |
| Cowan-Dickie Fishing Limited | Agriculture & fishing | 2013 |
| Cowley’S School of Motoring Ltd | Education | 2023 |
| Cowshed Media Ltd | Information & communication | 2024 |
| Cozy Flooring Limited | Construction | 2017 |
| Cozy Homes (SW) Ltd | Construction | 2020 |
| Cozy Kitchens Limited | Wholesale & retail | 2018 |
| CP Geo-Services Ltd | Professional & scientific | 2015 |
| CPM Partnership Limited | Construction | 2006 |