| Cardedge Limited | Wholesale & retail | 1993 |
| Cardiac Practice Limited | Hospitality | 2010 |
| Cardoso Consulting Ltd | Professional & scientific | 2010 |
| Care Assistants Limited | Real estate | 2014 |
| Care for EAR Ltd | Public administration | 2023 |
| Care Premier Ltd | Education | 2018 |
| Caremanor LLP | | 2010 |
| Caremanor Properties Limited | Real estate | 1997 |
| Careplus Care (UK) Limited | Administrative & support | 2000 |
| Carepoint Medical Services Limited | Health & social care | 2024 |
| Carfrey Limited | Construction | 1983 |
| Cargo DUC Ltd | Transport & logistics | 2026 |
| Cargrey House Residents Association Ltd. | Households | 1994 |
| Caribees Kitchen Ltd | Hospitality | 2019 |
| Carlo Manzi Limited | Administrative & support | 2008 |
| Carlton Avenue (Block C) Management Company Limited | Households | 1992 |
| Carma Services Limited | Other services | 2017 |
| Carmat Construct Ltd | Construction | 2025 |
| Carmine Court Energy Limited | Water & waste | 2023 |
| Carmine Court Leaseholders Group RTM Company Ltd | Households | 2021 |
| Caroline Court (Stanmore) Residents Association Limited | Households | 1970 |
| Caroline Court 2020 Limited | Extraterritorial | 2020 |
| Carousell Limited | Administrative & support | 2016 |
| Carpet Street Ltd | Wholesale & retail | 2022 |
| Carpodium Ltd | Wholesale & retail | 2020 |
| Carroo Limited | Wholesale & retail | 2022 |
| Carter & Jones Properties Ltd | Real estate | 2025 |
| Carter & Rose Property Solutions Ltd | Real estate | 2016 |
| Carthage Camden Accessories Ltd | Wholesale & retail | 2025 |
| Carwash Clubs Limited | Arts & recreation | 2002 |
| Casa Nueva Group Ltd | Real estate | 2024 |
| Casa Nuñez Ltd | Real estate | 2020 |
| Casablanca Resturant Limited | Hospitality | 2024 |
| Casada Health & Beauty Ltd | Health & social care | 2010 |
| Casafortuna AR Limited | Real estate | 2024 |
| Casaraclinic Limited | Other services | 2022 |
| Cascabella Limited | Professional & scientific | 2015 |
| Casco Trading Ltd | Wholesale & retail | 2026 |
| Case Closed Ltd. | Manufacturing | 2021 |
| Casey and Casey Construction Ltd | Construction | 2023 |
| Cash Flow Academy Limited | Professional & scientific | 2023 |
| Cask and Stillage Limited | Hospitality | 2014 |
| Casmar Limited | Administrative & support | 2012 |
| Casmar Properties Ltd | Real estate | 2025 |
| Cass Trading Ltd | Wholesale & retail | 2017 |
| Cassdesign Construction Ltd | Construction | 2026 |
| Castlegate Architectural Consultants Ltd | Professional & scientific | 2005 |
| Castlegate Architecture Surveying & Building Consultancy Ltd | Professional & scientific | 2005 |
| Castleham Management Limited | Real estate | 2015 |
| Castleham Property Limited | Real estate | 2015 |
| Castleham Taxation Services Limited | Professional & scientific | 2012 |
| Castlemans Residents Company Limited | Households | 1989 |
| Castletech Limited | Hospitality | 2012 |
| Castletime Limited | Real estate | 2013 |
| Cata Developments Ltd | Real estate | 2013 |
| Cataleya Developments Ltd | Real estate | 2023 |
| Catalin Tiron Tiling Ltd | Construction | 2026 |
| Catalin Vacaru Rail Limited | Construction | 2017 |
| CATALIN86 Limited | Construction | 2018 |
| Catalyst of Academics Limited | Education | 2011 |
| Catch Marketing Limited | Information & communication | 2018 |
| Caterserveuk Ltd | Professional & scientific | 2025 |
| Catford Padel Collective Limited | Arts & recreation | 2024 |
| Cathedral Walk Management Limited | Households | 2011 |
| Catherine Miller Print Limited | Other services | 2024 |
| Catia Goncalves Ltd | Real estate | 2021 |
| Catoe Sushi Delight Ltd | Hospitality | 2024 |
| Catrinuta Ltd | Wholesale & retail | 2020 |
| Cava Consulting Limited | Administrative & support | 2014 |
| Cavendish H.S.A. Limited | Construction | 1997 |
| Cavendish Investment Group Ltd | Administrative & support | 2017 |
| Cavenham Solutions Ltd | Professional & scientific | 2025 |
| Cavern Court (Liverpool) Management Company Limited | Households | 1983 |
| Cavontex Ltd | Construction | 2023 |
| CAZ Expert Ltd | Construction | 2023 |
| CB & JM Property Ltd | Real estate | 2020 |
| CB Sprint Ltd | Transport & logistics | 2026 |
| CB Wedding Ltd | Wholesale & retail | 2023 |
| Cbdc World Limited | Professional & scientific | 2023 |
| CBI Brickwork Ltd | Construction | 2024 |
| Cbmvisuals Limited | Information & communication | 2020 |
| CBS MEP Ltd | Professional & scientific | 2022 |
| CC Cladding UK Ltd | Manufacturing | 2023 |
| CCM Drylining Ltd | Construction | 2025 |
| CCP Construction Ltd | Construction | 2025 |
| CCS Tiling Limited | Construction | 2009 |
| Ccww Trading Limited | Wholesale & retail | 2026 |
| Cdbfood Ltd | Hospitality | 2025 |
| Cdfood Ltd | Hospitality | 2024 |
| CDG Music Ltd | Information & communication | 2018 |
| Cdig Rail Ltd | Construction | 2016 |
| CDR Industries Ltd | Other services | 2025 |
| CDR Management Ltd | Professional & scientific | 2022 |
| Ceasers Barbers Ltd | Other services | 2024 |
| Cedar House Care Home Limited | Health & social care | 2013 |
| Cedar International (UK) Limited | Administrative & support | 2015 |
| Cedar Road Flats 1ABC Limited | Real estate | 2016 |
| Cedarsoak Ltd | Administrative & support | 2014 |
| Ceepee Limited | Wholesale & retail | 2017 |
| Celebrity Baby Limited | Extraterritorial | 2007 |