| Cams Construction Ltd | Construction | 2024 |
| Cams Precision Limited | Professional & scientific | 2018 |
| Cams Properties Ltd | Real estate | 2024 |
| Camscoach Ltd | Professional & scientific | 2023 |
| Canaan Healthcare Group Limited | Administrative & support | 2020 |
| Canal Walk Limited | Real estate | 2024 |
| Candor Health Limited | Administrative & support | 2018 |
| Canley Specsavers Limited | Wholesale & retail | 2022 |
| Cannell & Chalmers Estates Limited | Real estate | 2024 |
| Cannock Specsavers Hearcare Limited | Wholesale & retail | 2017 |
| Cannock Specsavers Limited | Wholesale & retail | 1988 |
| Cannock Visionplus Limited | Wholesale & retail | 2000 |
| Cannock Voyager Specsavers Limited | Wholesale & retail | 2018 |
| Canopy IQ Ltd | Administrative & support | 2025 |
| Canterbury Specsavers Hearcare Limited | Wholesale & retail | 2003 |
| Canterbury Specsavers Limited | Wholesale & retail | 2001 |
| Canterbury Visionplus Limited | Wholesale & retail | 2001 |
| Canton Express Fareham Limited | Hospitality | 2022 |
| Canvey Island Specsavers Limited | Wholesale & retail | 2014 |
| CAP IT Automation Limited | Information & communication | 2024 |
| CAP Scaffolding Ltd | Construction | 2024 |
| Cape Verde Experience Ltd. | Administrative & support | 2006 |
| Capex Project Management Ltd | Professional & scientific | 2016 |
| Capital Groundworks Limited | Construction | 2023 |
| Capital Group Consultancy Limited | Professional & scientific | 2023 |
| Capital Homes (Cardozo Road) Ltd | Construction | 2018 |
| Capital Homes (Greater London) Limited | Construction | 2016 |
| Capital Homes (Southern) Ltd. | Construction | 1997 |
| Capital Homes Group Limited | Construction | 2015 |
| Capital Homes Investments Limited | Real estate | 2023 |
| Capital Investments Southern Limited | Real estate | 2017 |
| Capital Programmes Consultancy Limited | Information & communication | 2015 |
| Capital Traders Limited | Professional & scientific | 2014 |
| Cappo Group Limited | Professional & scientific | 2005 |
| Cappo International Limited | Administrative & support | 1986 |
| Capropco Limited | Real estate | 2019 |
| Captec Group PLC | Manufacturing | 2018 |
| Captec Limited | Manufacturing | 1984 |
| Captec Subsystems Engineering Limited | Manufacturing | 1966 |
| Capture Projects Ltd | Construction | 2026 |
| Capturewise Technology Ltd | Information & communication | 2023 |
| Car Adviser Limited | Wholesale & retail | 2004 |
| Car Craft AC Ltd | Wholesale & retail | 2026 |
| Caramel Records Limited | Arts & recreation | 2022 |
| Carbon Assets Limited | Professional & scientific | 2009 |
| Carbonday Ltd | Administrative & support | 2020 |
| Card Bros Ltd | Wholesale & retail | 2025 |
| Card Dons Ltd | Wholesale & retail | 2021 |
| Cardiff Specsavers Hearcare Limited | Wholesale & retail | 2003 |
| Cardiff Specsavers Limited | Wholesale & retail | 1990 |
| Cardiff ST Mellons Specsavers Limited | Wholesale & retail | 2024 |
| Cardiff Visionplus Limited | Wholesale & retail | 1993 |
| Cardigan Specsavers Limited | Wholesale & retail | 2011 |
| Cardinal Yacht Care Ltd | Manufacturing | 2024 |
| Cardioview Limited | Health & social care | 2024 |
| Care and Mobility Centre Ltd | Administrative & support | 2000 |
| Care Approved Bodyshop Support Limited | Professional & scientific | 2018 |
| Care Assist Network CIC | Administrative & support | 2025 |
| Care Ceylon UK Ltd | Health & social care | 2024 |
| Care Team Trainers Ltd | Professional & scientific | 2025 |
| Carestaff Supply Ltd | Health & social care | 2014 |
| Carie Dear Ltd | Wholesale & retail | 2025 |
| Carikam Ltd | Wholesale & retail | 2019 |
| Carioca Street Food Ltd | Hospitality | 2023 |
| Carisbrooke Associates Limited | Professional & scientific | 2016 |
| Cariss Land and Property Ltd | Professional & scientific | 2015 |
| Carl West Limited | Construction | 1997 |
| Carless Close (Gosport) Management Limited | Households | 1990 |
| Carlisle Specsavers Hearcare Limited | Wholesale & retail | 2006 |
| Carlisle Specsavers Limited | Wholesale & retail | 1992 |
| Carlisle Visionplus Limited | Wholesale & retail | 1992 |
| Carodean Property Ltd | Real estate | 2025 |
| Caroline Lodge LLP | | 2009 |
| Caroline Management Ltd | Real estate | 2011 |
| Carp Chaos Ltd | Wholesale & retail | 2022 |
| Carpenters Quay Management Company Limited | Households | 2005 |
| Carpet Clearance Warehouse (Portsmouth) Ltd | Wholesale & retail | 2001 |
| Carrera Bidco Limited | Financial services | 2025 |
| Carrera BIO Ltd | Professional & scientific | 2026 |
| Carrera Jvco Limited | Financial services | 2025 |
| Carrswood Yachts Limited | Wholesale & retail | 2015 |
| Cars of Fareham Limited | Extraterritorial | 2014 |
| Cars of Hampshire Ltd | Wholesale & retail | 2025 |
| Carson Student Properties Limited | Real estate | 2019 |
| Carsons Ltd | Wholesale & retail | 2021 |
| Cartek Letting Limited | Real estate | 2020 |
| Carter & Sons Electrical Ltd | Construction | 2014 |
| Carter and Hardy Ltd | Wholesale & retail | 2023 |
| Carter Business Property Ltd | Real estate | 2026 |
| Cartman Limited | Information & communication | 2000 |
| Cartrefi Jenkins Ltd | Real estate | 2025 |
| CAS Intl Ltd | Information & communication | 2013 |
| CAS Yachting Limited | Other services | 2026 |
| Casa Accountancy & Bookkeeping Limited | Professional & scientific | 2014 |
| Casa Onaca Ltd | Real estate | 2026 |
| Casita Property Ltd | Real estate | 2022 |
| Cass Baxter Carpentry & Construction Ltd | Construction | 2022 |
| Cast-Off Ltd | Wholesale & retail | 2025 |
| Castilian Way Ltd | Extraterritorial | 2021 |
| Castle (EU) Limited | Wholesale & retail | 2012 |