| Cosmetic Practitioners Training Network LP | | 2016 |
| Cosmetics @ Indulgence Limited | Other services | 2023 |
| Cosmo Sarah Limited | Wholesale & retail | 2025 |
| Costa Investment Properties Limited | Real estate | 2020 |
| Costal Brick Developments Ltd | Real estate | 2026 |
| Costura Limited | Wholesale & retail | 2014 |
| Cotswold Chelsea Limited | Health & social care | 2023 |
| Cotswold Hardy Plants Ltd | Agriculture & fishing | 1979 |
| Cotton Investments Limited | Financial services | 2019 |
| Couch & Hoskin Limited | Manufacturing | 1957 |
| Coughlan Brickworks Ltd | Construction | 2019 |
| Counselling Buddy Ltd | Information & communication | 2026 |
| Counterparts (Demolition) Limited | Wholesale & retail | 1980 |
| Counters Barn Ltd | Real estate | 2025 |
| Country & Coast Property Management Ltd | Hospitality | 2022 |
| Country Antiques & Interiors Limited | Wholesale & retail | 1994 |
| Country Breaks Limited | Information & communication | 2008 |
| Country Garden Patio Centre Limited | Wholesale & retail | 2002 |
| Country Press (South West) Limited | Manufacturing | 2001 |
| Countryheat Limited | Administrative & support | 2009 |
| Countryside Homes (SW) Limited | Construction | 2018 |
| County Castle Fitness Ltd | Arts & recreation | 2025 |
| County Cricket Matters Ltd | Information & communication | 2020 |
| County Garage (Newton Abbot) Limited | Wholesale & retail | 2006 |
| County Skip Hire Limited | Water & waste | 1999 |
| County Tile Warehouse Limited | Wholesale & retail | 1991 |
| Court Place Development Limited | Construction | 2018 |
| Court Road Energy Limited | Energy | 2024 |
| Courtbrook Limited | Construction | 2025 |
| Courtenay Place Residents Limited | Households | 2002 |
| Courtis Communications and Utilities Limited | Construction | 2023 |
| Courtney Roofing Services Ltd | Construction | 2021 |
| Courtney Stevens Permanent Makeup Ltd | Other services | 2017 |
| Courtney Stevens Permanent Makeup Training Academy Ltd | Other services | 2019 |
| Courtside Conversions Limited | Manufacturing | 2001 |
| Courtyard (Ebford) Management Limited | Administrative & support | 2009 |
| Cove Cafe (SW) Ltd | Hospitality | 2024 |
| Cove Food Ltd | Hospitality | 2025 |
| Coverdale Court Management Company Limited | Hospitality | 2015 |
| Coward Consulting Limited | Professional & scientific | 2017 |
| Cowdray Eyecare Ltd | Health & social care | 2025 |
| Cowick Retail Ltd | Wholesale & retail | 2024 |
| Cowley Cooling Ltd | Manufacturing | 2017 |
| Cowley Place Management Limited | Households | 1996 |
| Cowork Ventures Ltd | Real estate | 2016 |
| Coxes Monkey and Spanner Ltd | Hospitality | 2020 |
| CP Proclean Ltd | Administrative & support | 2025 |
| CP Shipping Limited | Transport & logistics | 2003 |
| CPC Courier Ltd | Transport & logistics | 2020 |
| Cpfw Limited | Financial services | 2022 |
| Cpia Ltd | Professional & scientific | 2016 |
| CPM General Builders Ltd | Construction | 2019 |
| Cqbeanz Ltd | Wholesale & retail | 2026 |
| Crabpots UK Ltd | Manufacturing | 2019 |
| Crackshot Limited | Arts & recreation | 2014 |
| Craftmongers Ltd | Wholesale & retail | 2023 |
| Crafty Cakes Limited | Manufacturing | 2003 |
| Crallan Jones Limited | Real estate | 2015 |
| Cranbrook Kebab House Ltd | Hospitality | 2026 |
| Cranbrook Youth Club CIC | Arts & recreation | 2022 |
| Crank House Coffee Ltd | Wholesale & retail | 2013 |
| Cranmere Court Management Company Limited | Real estate | 1992 |
| Crannaford Estates Ltd | Hospitality | 2026 |
| Crantech Ltd | Other services | 2025 |
| Crash Box & Classic Car Club of Devon Limited | Other services | 1977 |
| Crashing Wave Music Limited | Arts & recreation | 2007 |
| Crawford Munro Consulting Limited | Professional & scientific | 2012 |
| Crawfords GAS Plumbing & Heating Limited | Construction | 2021 |
| Crazy COW Competitions Ltd | Arts & recreation | 2025 |
| CRC Batteries Ltd | Manufacturing | 2019 |
| CRE Civil Group PTY Ltd | Real estate | 2020 |
| Crealy Limited | Extraterritorial | 2001 |
| Cream Park Limited | Professional & scientific | 2022 |
| Create Carpentry and Bespoke Joinery Ltd | Construction | 2026 |
| Creating Excellence: (SW) Ltd | Extraterritorial | 2018 |
| Creatingexcellencecompany Ltd | Extraterritorial | 2018 |
| Creative Aquatic Ltd | Arts & recreation | 2013 |
| Creative Culture South West C.I.C. | Education | 2017 |
| Creative Cutz Limited | Other services | 2015 |
| Creative Kitchens Exeter Ltd | Construction | 2025 |
| Creative Loft Conversions Herts Limited | Construction | 2015 |
| Creative Medical Research Limited | Professional & scientific | 2003 |
| Creative Music Hub CIC | Arts & recreation | 2021 |
| Creative Objects Ltd | Administrative & support | 2005 |
| Crediton Dental Centre Limited | Health & social care | 2020 |
| Crediton Rugby Football Club Commercial Limited | Arts & recreation | 2023 |
| Crediton Rugby Football Club Limited | Arts & recreation | 2013 |
| Crediton Wholesale Ltd | Wholesale & retail | 2023 |
| Creeks Cakes Ltd | Wholesale & retail | 2024 |
| Creeks Cuppa Ltd | Hospitality | 2024 |
| Crescent Bay Properties Ltd | Real estate | 2020 |
| Crescent Wealth Management Limited | Financial services | 2016 |
| Cresco Asset Management Limited | Professional & scientific | 2019 |
| Cresswell Consultancy Limited | Information & communication | 2013 |
| Crestwoods Homes Ltd | Construction | 2025 |
| Creww Executive Board Limited | Other services | 2021 |
| CRG Ventures Ltd | Real estate | 2020 |
| Crispin Associates (UK) Ltd | Administrative & support | 2002 |
| Crisplane Limited | Real estate | 2004 |
| Critical Mass Comics Limited | Wholesale & retail | 2012 |