| Caraston Hall Support Limited | Health & social care | 2009 |
| Caraston Holdings Ltd | Health & social care | 2022 |
| Caravan MAN (Western) Limited | Other services | 2007 |
| Carbon Compost Company Limited | Manufacturing | 2010 |
| Carbon Husky Limited | Financial services | 2018 |
| Carbon.Gc Limited | Other services | 2007 |
| Card Energy Ltd | Construction | 2018 |
| Cardens Estate Agents Limited | Real estate | 2003 |
| Cardinal Point Consulting Limited | Professional & scientific | 2025 |
| Cardiomind Research Consultancy Ltd | Professional & scientific | 2026 |
| Cardyard Ltd | Wholesale & retail | 2012 |
| Care Contracts SW Ltd | Health & social care | 2025 |
| Care Gems Southwest Ltd | Public administration | 2026 |
| Caredkids Ltd | Health & social care | 2025 |
| Career-Bridge Recruitment Ltd | Administrative & support | 2026 |
| Carenova Ltd | Health & social care | 2022 |
| Carepathways (South West) Limited | Health & social care | 2024 |
| Cargo 2 Plot Management Company Limited | Real estate | 2012 |
| Carisbrooke Marine Ltd | Other services | 2017 |
| Carkive Ltd | Information & communication | 2026 |
| Carlos Roberto@Services Ltd | Administrative & support | 2024 |
| Carm Construction Management Limited | Construction | 2020 |
| Carm Group Limited | Construction | 2018 |
| Carman Kebab Ltd | Hospitality | 2019 |
| Carman Partners Limited | Professional & scientific | 2020 |
| Caroline Clare Ltd | Financial services | 2024 |
| Carousel Catering Ltd | Hospitality | 2023 |
| Carparison Limited | Administrative & support | 2018 |
| Carpenter Family Limited | Health & social care | 2026 |
| Carrington Projects Limited | Construction | 1996 |
| Cars & Cuppas Ltd | Arts & recreation | 2024 |
| Cars Inc Ltd | Wholesale & retail | 2021 |
| Carshalton Boiler Services Limited | Construction | 1990 |
| Cartcorner Limited | Wholesale & retail | 2023 |
| Carter & Robson Limited | Financial services | 2024 |
| Carter Eco Tech Ltd | Construction | 2025 |
| Carter Highway Consulting Limited | Construction | 2022 |
| Carter PCW Ltd | Real estate | 2024 |
| Carterhatch Architectural Acoustics Ltd | Professional & scientific | 2018 |
| Cartridges Law LLP | | 2022 |
| Carus Travel Limited | Administrative & support | 2011 |
| Carvanbits Ltd | Wholesale & retail | 2022 |
| Carys Flain Consultancy Limited | Professional & scientific | 2021 |
| Casalia Limited | Real estate | 2024 |
| Cashflow Creators Limited | Administrative & support | 2013 |
| Casita Escapes Limited | Hospitality | 2024 |
| Caspernina Properties Ltd | Real estate | 2010 |
| Castina Properties Limited | Real estate | 2019 |
| Castle Barton Limited | Real estate | 1988 |
| Castle Court Holdings Limited | Real estate | 1989 |
| Castle Court Leisure Limited | Professional & scientific | 1991 |
| Castle Court Retail Limited | Construction | 1988 |
| Castle Features Joinery Ltd | Manufacturing | 2025 |
| Castle Lakes Property Limited | Real estate | 2021 |
| Castle Lane (Woodbury) Management Company Limited | Real estate | 2015 |
| Castle View Press Limited | Information & communication | 2022 |
| Castleton Property Development Ltd | Real estate | 2023 |
| Castries Homes Ltd | Real estate | 2023 |
| Catalysed Ltd | Information & communication | 2016 |
| Catalyst Business Growth Limited | Professional & scientific | 2026 |
| Catch 77 Community Interest Company | Hospitality | 2020 |
| Caterina Properties Ltd | Real estate | 2017 |
| Catersw Ltd | Hospitality | 2024 |
| Cathedral & Quay Developments Ltd | Construction | 2018 |
| Cathedral & Quay Portfolio Ltd | Hospitality | 2019 |
| Cathedral & Quay Properties Ltd | Real estate | 2015 |
| Cathedral Appointments Limited | Administrative & support | 1998 |
| Cathedral Contractors Limited | Construction | 2019 |
| Cathedral Physiotherapy Limited | Health & social care | 2015 |
| Cathedral Property Management (Southernhay East) Limited | Households | 2022 |
| Catherine Harwood Bell LLP | | 2004 |
| Cathy Colston Property Limited | Real estate | 2010 |
| Catwalk Club Devon Ltd | Wholesale & retail | 2025 |
| Causimo Limited | Information & communication | 2026 |
| Cavenagh Real Estate Ltd | Real estate | 2023 |
| Cavendish Collection Ltd | Wholesale & retail | 2026 |
| Cavendish Online Limited | Financial services | 2000 |
| Cavern Music & Arts Collective C.I.C. | Arts & recreation | 2017 |
| Cavern Promotions Limited | Hospitality | 2012 |
| Cavity Tray Cleaner Ltd | Manufacturing | 2022 |
| Caya Living Limited | Real estate | 2022 |
| Cayeco Ltd | Extraterritorial | 2016 |
| CB Heating and Hot Water Services Ltd | Construction | 2020 |
| Cbam Investments Limited | Financial services | 1991 |
| CBD Homes Limited | Construction | 2023 |
| CC Cosmetics Ltd | Other services | 2024 |
| CC Environmental Services Ltd | Professional & scientific | 2019 |
| CC Exeter Limited | Hospitality | 2021 |
| Ccal Plant & Commercials Ltd | Wholesale & retail | 2025 |
| CCH Europe Limited | Extraterritorial | 2007 |
| CCH Property Company Limited | Extraterritorial | 2000 |
| CCS SW Limited | Construction | 2020 |
| CCT Homes Limited | Real estate | 2023 |
| CCT Property Group Limited | Real estate | 2020 |
| Cctv Engineering Limited | Professional & scientific | 2001 |
| Cctv Options (UK) Ltd | Administrative & support | 2017 |
| CD Manifold Holdings Limited | Financial services | 2019 |
| Cdclee Ltd | Information & communication | 2022 |
| CDF Engineering Group Ltd | Other services | 2026 |
| CDF Transport Services Ltd | Transport & logistics | 2026 |