| Casa Futures Ltd | Hospitality | 2024 |
| Casting Support Systems Limited | Manufacturing | 1994 |
| Cater Point UK Ltd | Manufacturing | 2025 |
| Cater Works Ltd | Manufacturing | 2026 |
| Caterclean and Extraction Ltd | Administrative & support | 2026 |
| Cath's Cafe Limited | Hospitality | 2026 |
| Cattlemans PUB Group Ltd | Hospitality | 2018 |
| Cattlemans Steakhouse PGN Ltd | Hospitality | 2024 |
| Cavendish Global Ltd | Administrative & support | 2024 |
| Cavendish Maxwell (Africa) Limited | Professional & scientific | 2019 |
| Cavendish Maxwell Holdings Limited | Professional & scientific | 2019 |
| Cavendish Maxwell Limited | Professional & scientific | 2016 |
| Cavendish Technology Ltd | Information & communication | 2016 |
| Cayman Golf Ltd | Arts & recreation | 2024 |
| CB Stych Services Limited | Administrative & support | 2025 |
| CCP Procurement Ltd | Wholesale & retail | 2022 |
| CDM Industrial Roofing and Cladding Ltd | Construction | 2022 |
| CE Construction SW Ltd | Construction | 2026 |
| Central Embroidery Limited | Wholesale & retail | 2003 |
| Centre Pass Apparel Ltd | Wholesale & retail | 2020 |
| Centrepeace | Health & social care | 2012 |
| Chanel House Management Company Ltd | Households | 2024 |
| Chantilly Patisserie Limited | Hospitality | 2018 |
| Chartrite Limited | Manufacturing | 1993 |
| Chase Properties (SW) Ltd | Real estate | 2025 |
| Chasewood Business Services Ltd | Information & communication | 2022 |
| Cheng an YI Company Limited | Hospitality | 2022 |
| Chico Foods Ltd | Hospitality | 2025 |
| Chief Vehicle Rentals Limited | Administrative & support | 2001 |
| Chilcor Ltd | Administrative & support | 2019 |
| Child Friendly Products Limited | Arts & recreation | 2016 |
| Chillcotts Ltd | Professional & scientific | 2006 |
| Chilldayz Limited | Hospitality | 2025 |
| Chloe Perry Enabling Ltd | Professional & scientific | 2022 |
| Chloe Perry Ltd | Professional & scientific | 2021 |
| Churston Builders Limited | Construction | 2018 |
| Ciqurix Ltd | Administrative & support | 2012 |
| CJK Developers Ltd | Construction | 2007 |
| CJK Rentals Ltd | Real estate | 2017 |
| CKM Media (SW) Ltd | Professional & scientific | 2021 |
| Cladiators Ltd | Construction | 2023 |
| Claire Burton Limited | Real estate | 2025 |
| Claron (Plastics) Limited | Manufacturing | 1984 |
| Claron Limited | Manufacturing | 2008 |
| Classic Motorhomes Ltd | Wholesale & retail | 2022 |
| Clay Cellars Studio Ltd | Arts & recreation | 2025 |
| Clay Tokens Limited | Professional & scientific | 2012 |
| Clean Bright Cleaning Services Ltd | Administrative & support | 2020 |
| Clear Acoustic Design Ltd | Professional & scientific | 2019 |
| Clearway Clean & Care Ltd | Administrative & support | 2025 |
| Clennon Cleaning & Access SW Limited | Administrative & support | 2018 |
| Clialto Ltd | Information & communication | 2004 |
| Click Limited | Wholesale & retail | 2015 |
| Clothing Your Way Limited | Wholesale & retail | 2016 |
| Clovis Management Company Limited | Households | 1991 |
| CMS Consultancy & Management Services Limited | Professional & scientific | 2016 |
| Coast 2 Coast Digital Ltd | Professional & scientific | 2015 |
| Coast and County Ltd | Wholesale & retail | 2022 |
| Coast Project Developments Limited | Professional & scientific | 2022 |
| Coast Property Surveyors Ltd | Professional & scientific | 2025 |
| Codex AI Ltd | Information & communication | 2024 |
| Coffee Couture Plymouth Ltd | Hospitality | 2017 |
| Coffee Couture Wholesale Limited | Wholesale & retail | 2016 |
| Coles Court Management Company Limited | Households | 2016 |
| Colin Masters Ltd | Construction | 2018 |
| Colin Rundle & SON Limited | Construction | 2014 |
| Collecta Tempus Ltd | Wholesale & retail | 2023 |
| Collectively Diverse C.I.C. | Education | 2025 |
| Coludrevel Ltd | Wholesale & retail | 2025 |
| Commercial Go-Karts Limited | Wholesale & retail | 1965 |
| Community Pony C.I.C. | Other services | 2021 |
| Compacfoam UK Limited | Wholesale & retail | 2023 |
| Complementary Medical Assoc UK Ltd | Other services | 2025 |
| Complementary Medical Association Limited | Health & social care | 2002 |
| Complete Campers SW Ltd | Wholesale & retail | 2022 |
| COMPLIANCY101 Ltd | Health & social care | 2023 |
| Compton Valley Nursery Limited | Health & social care | 2011 |
| Compton Valley Wealth Management Ltd | Professional & scientific | 2009 |
| Compwiz Ltd | Wholesale & retail | 2013 |
| Concise Law Limited | Professional & scientific | 2022 |
| Concise Wealth Management Ltd | Financial services | 2010 |
| Condor Vehicle Sales Ltd | Wholesale & retail | 2020 |
| Confidence Makers CIC | Education | 2023 |
| Conservation Chat UK Ltd | Administrative & support | 2020 |
| Consult SW Ltd | Construction | 2025 |
| Coracle Retreats Ltd | Other services | 2025 |
| Core-Solutions SW Ltd | Professional & scientific | 2025 |
| Countrywide Funding Solutions Limited | Financial services | 2019 |
| Countrywide Solutions Limited | Other services | 2015 |
| Courtlands NO 1 (Exmouth) Management Company Limited | Households | 2006 |
| Cover ME Fitness Limited | Administrative & support | 2023 |
| Cover ME Ltd | Administrative & support | 2020 |
| Cover ME MD Limited | Administrative & support | 2023 |
| Cozy Kitchen Cafe Ltd | Hospitality | 2026 |
| CP Electrical SW Limited | Construction | 2016 |
| Crafty FOX Community Hub CIC | Hospitality | 2024 |
| CRE8IVE Media Ltd | Information & communication | 2020 |
| CRE8IVE Works Ltd | Professional & scientific | 2025 |
| Createaapp Limited | Information & communication | 2014 |
| Creator Merch Solutions Ltd | Professional & scientific | 2025 |