| Ccms Commercial Cleaning Maintenance Services Limited | Other services | 2017 |
| CCP (Staffs) Limited | Transport & logistics | 2018 |
| CCP Holdings Stoke Limited | Real estate | 2019 |
| CCR Trading Ltd | Wholesale & retail | 2020 |
| CCS Care Recruitment Ltd | Administrative & support | 2020 |
| CCS Contracting Group Ltd | Financial services | 2026 |
| CCS Environmental Ltd | Professional & scientific | 2026 |
| CCS Facade Solutions Ltd | Construction | 2025 |
| CCS Fuel Injection Limited | Manufacturing | 2018 |
| CCS Mclays Limited | Wholesale & retail | 1998 |
| CCS Trade Ltd | Agriculture & fishing | 2018 |
| CCW - Training Academy Limited | Professional & scientific | 2009 |
| CCX Land Limited | Information & communication | 2025 |
| CD Consulting Group Ltd | Professional & scientific | 2023 |
| CD Press International Limited | Wholesale & retail | 2002 |
| CD Properties Cardiff Limited | Real estate | 2022 |
| CD SPV 1 Holdings Ltd | Real estate | 2025 |
| CD SPV 1 Ltd | Construction | 2024 |
| Cdab Coker Design & Build Limited | Construction | 2017 |
| Cdba Trading Limited | Construction | 2023 |
| CDC Food Ltd | Hospitality | 2025 |
| CDC Resources Ltd | Other services | 2021 |
| CDC Specialists Ltd | Administrative & support | 2012 |
| CDF Developments Ltd | Real estate | 2021 |
| CDF Investments Limited | Real estate | 2013 |
| CDF Lets Limited | Real estate | 2025 |
| CDG Transport Cargo Ltd | Transport & logistics | 2025 |
| CDG Wine Merchants Ltd | Wholesale & retail | 2021 |
| CDI Limited | Construction | 2018 |
| CDM Environmental Ltd | Construction | 2017 |
| CDM Holding Ltd | Wholesale & retail | 2018 |
| CDP Paws Limited | Wholesale & retail | 2022 |
| CDP Training & Development Limited | Education | 2002 |
| Cdrs Group Ltd | Information & communication | 2024 |
| Cdryer Consulting Limited | Professional & scientific | 2026 |
| CDS Consultancy Services Limited | Financial services | 2002 |
| CDS Motor Company Ltd. | Other services | 2017 |
| Cdsm Limited | Transport & logistics | 2019 |
| CDT (Cardiff) Limited | Hospitality | 2018 |
| CDW Group Ltd | Wholesale & retail | 2019 |
| Ce-K Consultancy Limited | Professional & scientific | 2019 |
| Ceagre Limited | Information & communication | 2019 |
| Ceams World Ltd | Wholesale & retail | 2022 |
| Ceased Trading 07482180 Ltd | Other services | 2011 |
| Ceased Trading 09176977 Limited | Construction | 2014 |
| Ceased Trading 09811276 Limited | Agriculture & fishing | 2015 |
| Ceased Trading 10163113 Ltd | Wholesale & retail | 2016 |
| Ceased Trading 10238319 Ltd | Hospitality | 2016 |
| Ceased Trading 10353116 Ltd | Transport & logistics | 2016 |
| Ceased Trading 10826122 Limited | Construction | 2017 |
| Ceased Trading 11483984 Ltd | Administrative & support | 2018 |
| Ceased Trading 11717824 Ltd | Hospitality | 2018 |
| Ceased Trading 12208392 Ltd | Mining & quarrying | 2019 |
| Ceased Trading 12328538 Ltd | Wholesale & retail | 2019 |
| Ceased Trading 12338565 Ltd | Construction | 2019 |
| Ceased Trading 14587449 Ltd | Wholesale & retail | 2023 |
| Ceased Trading 15839594 Ltd | Construction | 2024 |
| Ceative Limited | Information & communication | 2019 |
| Ceaton Holdings Limited | Financial services | 2022 |
| Ceaton Security Services Limited | Administrative & support | 1991 |
| CEC Enterprise Limited | Administrative & support | 2014 |
| Cece's Choice Ltd | Hospitality | 2020 |
| Cedar Events Limited | Hospitality | 2025 |
| Cedar Harbor Cloud Ltd | Information & communication | 2025 |
| Cedar Renovations Limited | Real estate | 2016 |
| Cedar Support Limited | Information & communication | 2003 |
| Cedar Support Properties Ltd | Real estate | 2017 |
| Cedar Trade Limited | Wholesale & retail | 2018 |
| Cedar Tree Accountancy Limited | Extraterritorial | 2015 |
| Cedar Vale Health Ltd | Wholesale & retail | 2026 |
| Cedarmont Limited | Health & social care | 2006 |
| Cedars Dental Practice Limited | Health & social care | 2010 |
| Cedarwoodcreations Ltd | Wholesale & retail | 2025 |
| Ceddr Healthcare Solutions Ltd | Health & social care | 2024 |
| Ceder TP Ltd | Health & social care | 2026 |
| Cedyrn Ltd | Information & communication | 2016 |
| Ceedubu Ltd | Wholesale & retail | 2019 |
| Ceeesscee Ltd | Wholesale & retail | 2016 |
| Ceejay Publishing Limited | Information & communication | 2018 |
| Cefala Consultants Ltd | Administrative & support | 2014 |
| Cefel Construction Ltd | Construction | 2019 |
| Cefn Bryn Holdings Limited | Real estate | 2023 |
| Cefn Carnau Property Ltd | Real estate | 2021 |
| Cefn Coed Gardens Ltd | Households | 2010 |
| Cefn Coed Gardens Management Company Limited | Households | 1973 |
| Cefn Coed Management Limited | Administrative & support | 2003 |
| Cefn Court Management Co. Limited | Households | 1974 |
| Cefn Mably Country House Limited | Households | 2000 |
| Cefn Mably Country Park Limited | Households | 2000 |
| Cefn Mably Farm Park Limited | Arts & recreation | 2007 |
| Cefn Mably Walled Garden Limited | Households | 2002 |
| CEG Run Ltd | Arts & recreation | 2025 |
| Cegin Earl / Earl's Kitchen CYF. | Manufacturing | 2018 |
| Cein Fashion Ltd | Wholesale & retail | 2023 |
| Ceir R.D Cars Limited | Wholesale & retail | 2019 |
| Ceirios Limited | Administrative & support | 2016 |
| CEL Trustee Limited | Administrative & support | 2018 |
| Celebi Group UK Ltd | Construction | 2020 |
| Celebrities Catering Ltd | Hospitality | 2021 |
| Celebrities Express Ltd | Hospitality | 2025 |