| Calido Investments Limited | Real estate | 2021 |
| Calinescu Victor Limited | Construction | 2015 |
| Calista Beauty and Care Ltd | Other services | 2024 |
| Calista Beauty Ltd | Other services | 2012 |
| Call Point Fire Ltd | Professional & scientific | 2010 |
| Call-N-Clean Ltd | Administrative & support | 2023 |
| Calma Properties Ltd | Real estate | 2024 |
| Calorate Limited | Professional & scientific | 2025 |
| Cals Property Ltd | Real estate | 2021 |
| Calthorpe Gardens Freehold Limited | Administrative & support | 2017 |
| Calthorpe Gardens Property Management Co Limited | Administrative & support | 1964 |
| Caltrax Group Ltd | Wholesale & retail | 2025 |
| Calu-Uk Ltd | Transport & logistics | 2014 |
| Calver Consultancy Limited | Professional & scientific | 2023 |
| Camara DE Acasa Ltd | Wholesale & retail | 2026 |
| Camarad Solutions Ltd | Professional & scientific | 2017 |
| Camavelo Services Limited | Financial services | 2014 |
| Camber Consulting Limited | Professional & scientific | 2007 |
| Camberley Care Limited | Health & social care | 2014 |
| Cambridge Capital Partnership Ltd | Real estate | 2025 |
| Cambridge Dental Specialists Limited | Health & social care | 2020 |
| Cambridge Green Innovations Limited | Information & communication | 2017 |
| Camcap Consulting Ltd | Professional & scientific | 2016 |
| Camcom Ltd | Financial services | 2022 |
| Camden Cables Ltd | Construction | 2023 |
| Camden Contractors Ltd | Construction | 2012 |
| Camden Service Centre Limited | Wholesale & retail | 2023 |
| Camellia Motors Ltd | Wholesale & retail | 2014 |
| Cameo London Limited | Wholesale & retail | 2017 |
| Cameron Tate Investment Limited | Information & communication | 2003 |
| Cameroon Britain Business Council (Cbbc) | Other services | 2016 |
| Camforyou Limited | Hospitality | 2018 |
| Camhall Limited | Other services | 1992 |
| Camilla Khawaja Ltd | Professional & scientific | 2022 |
| Camouflage Group Limited | Arts & recreation | 2025 |
| Camouflage IT Limited | Arts & recreation | 2010 |
| Campaign Master (UK) Limited | Information & communication | 2004 |
| Campaigns on Mind Ltd | Wholesale & retail | 2023 |
| Campbell.S Homes Limited | Real estate | 2021 |
| Campbells Sponsorship Ltd | Professional & scientific | 2001 |
| Campden Real Estate Ltd | Real estate | 2020 |
| Campfame Limited | Information & communication | 2005 |
| Campion More Limited | Real estate | 2016 |
| Campion More Real Estates Limited | Real estate | 2021 |
| Campo Trade UK Limited | Financial services | 2020 |
| Campus Cars Ltd | Wholesale & retail | 2013 |
| Camroc Construction Ltd | Construction | 2020 |
| CAN Consulting Limited | Professional & scientific | 2023 |
| CAN Drainage Properties Ltd | Real estate | 2025 |
| Canada Road (Walmer Kent) Management Company Limited | Households | 2007 |
| Canada Visa Agents Ltd | Professional & scientific | 2022 |
| Canada Waters Estate Management Company Limited | Households | 1997 |
| Canada Waters Freehold Company Limited | Households | 2001 |
| Canada Waters Management Company (NO.1) Limited | Households | 1997 |
| Canada Waters Management Company (NO.2) Limited | Other services | 1997 |
| Canalside Orsman Limited | Real estate | 2025 |
| Canam Trading Co (UK) Ltd. | Wholesale & retail | 1981 |
| Cancast Limited | Information & communication | 2017 |
| Cancer AID for North/East (SRI Lanka) | Health & social care | 1993 |
| Candeo Cleaning Ltd | Administrative & support | 2024 |
| Candid Bear Limited | Professional & scientific | 2017 |
| Candilicious UK Limited | Administrative & support | 2020 |
| Candlewood House Limited | Real estate | 2016 |
| Candy Street London Limited | Manufacturing | 2023 |
| Candymoon Limited | Wholesale & retail | 2025 |
| Candywash Limited | Real estate | 1971 |
| Canford Trading Limited | Wholesale & retail | 2008 |
| Cangles Close Limited | Real estate | 2017 |
| Cann Travel Ltd | Administrative & support | 2009 |
| Cannfix Ltd | Health & social care | 2022 |
| Cannon and Morley Productions Limited | Information & communication | 1999 |
| Canon Residential Ltd | Real estate | 2026 |
| Canons Corner Limited | Administrative & support | 2026 |
| Cantab Dental Limited | Health & social care | 2023 |
| Canton Partners Ltd | Professional & scientific | 2025 |
| Canview 1 Limited | Other services | 2020 |
| Capa Caet Ltd | Administrative & support | 2022 |
| Capact Limited | Real estate | 2018 |
| Capcrest Limited | Administrative & support | 2016 |
| Cape Pubs Limited | Hospitality | 2024 |
| Capelli 82 Limited | Other services | 2022 |
| Capgen Partners Limited | Real estate | 2015 |
| Capgrange Property Management Company Limited | Households | 1990 |
| Capital & Nationwide Limited | Real estate | 2009 |
| Capital Allocation Limited | Professional & scientific | 1991 |
| Capital Building Contractors Limited | Construction | 2021 |
| Capital Car Clinic Ltd | Wholesale & retail | 2017 |
| Capital Claims Management Limited | Administrative & support | 2008 |
| Capital Co Services Limited | Financial services | 2024 |
| Capital Commodities Limited | Extraterritorial | 2021 |
| Capital Estates and Management Limited | Real estate | 2021 |
| Capital Gift Agency Ltd | Wholesale & retail | 2001 |
| Capital Hire Management Ltd | Administrative & support | 2009 |
| Capital Logic Investments Limited | Information & communication | 2013 |
| Capital Medical Ltd | Administrative & support | 2020 |
| Capital Properties Services Ltd | Construction | 2023 |
| Capital Radiosurgery Limited | Financial services | 2022 |
| Capital Repairs Ltd | Other services | 2016 |
| Capital Security and Facilities Management Ltd | Administrative & support | 2023 |
| Capital Service Engineers Ltd | Construction | 2009 |