| Celebrity Creations Management Ltd | Administrative & support | 2022 |
| Celerix Limited | Information & communication | 2024 |
| Celestara Trading Ltd | Wholesale & retail | 2025 |
| Celestia Management Company Limited | Real estate | 2004 |
| Celestial Business Solutions Ltd | Other services | 2024 |
| Celestial Charm Crafts Ltd | Wholesale & retail | 2025 |
| Celestial Estate Ltd | Other services | 2025 |
| Celestial Family Office Limited | Professional & scientific | 2021 |
| Celestial Management Limited | Manufacturing | 2012 |
| Celestialcrest Consulting Limited | Information & communication | 2024 |
| Celestra Group PC | | 2017 |
| Celf Creative Design Ltd | Professional & scientific | 2000 |
| Celf Limited | Wholesale & retail | 2023 |
| Celine Travel Ltd | Wholesale & retail | 2017 |
| Cell Building Services Ltd | Construction | 2019 |
| Cell Plastering & Property Services Ltd | Construction | 2019 |
| Cellar Link Limited | Wholesale & retail | 2008 |
| Cellaro Romano Ltd | Professional & scientific | 2010 |
| Cellesce Limited | Professional & scientific | 2013 |
| Celli Ltd | Wholesale & retail | 2023 |
| Cellis Trading Limited | Wholesale & retail | 2019 |
| Cellord Group Limited | Manufacturing | 2019 |
| Cellorem Ltd | Professional & scientific | 2022 |
| Celltric Ltd | Wholesale & retail | 2024 |
| Cellular Attitude Limited | Professional & scientific | 2019 |
| Cellularsims Limited | Information & communication | 2024 |
| Celrose Mini Mart Limited | Wholesale & retail | 2024 |
| Celsius Heating & Plumbing Ltd | Construction | 2016 |
| Celtara Ltd | Financial services | 2025 |
| Celtic Barks Ltd | Other services | 2023 |
| Celtic Compressors and Pneumatics Limited | Construction | 2012 |
| Celtic Construction and Developments Ltd | Construction | 2018 |
| Celtic Cooling and Heating Limited | Construction | 2003 |
| Celtic Developments Ltd | Construction | 2019 |
| Celtic Distribution Ltd | Wholesale & retail | 2025 |
| Celtic Ecology and Conservation Ltd. | Professional & scientific | 2016 |
| Celtic Energy Limited | Mining & quarrying | 1994 |
| Celtic Environmental Limited | Wholesale & retail | 2025 |
| Celtic Executive Travel Ltd | Transport & logistics | 2016 |
| Celtic Fencing Services Limited | Manufacturing | 2024 |
| Celtic Finance Ltd | Financial services | 2021 |
| Celtic Geomatics Ltd | Professional & scientific | 2016 |
| Celtic Hairdressers Ltd | Other services | 1996 |
| Celtic Housing Ltd | Real estate | 2017 |
| Celtic Investments Limited | Financial services | 2005 |
| Celtic Leasing Company Limited | Administrative & support | 2025 |
| Celtic Logistics Limited | Transport & logistics | 2004 |
| Celtic Minerals Limited | Manufacturing | 2022 |
| Celtic Mining Group Limited | Mining & quarrying | 2004 |
| Celtic Mining Limited | Mining & quarrying | 1994 |
| Celtic Mining Operations Group Limited | Extraterritorial | 2007 |
| Celtic Powerhouse Management Ltd | Professional & scientific | 2019 |
| Celtic Precast Ltd | Construction | 2021 |
| Celtic Productions Limited | Information & communication | 1993 |
| Celtic Properties (Wales) Limited | Construction | 1997 |
| Celtic Property Maintenance Services Limited | Manufacturing | 2010 |
| Celtic Property Solutions Ltd | Real estate | 2023 |
| Celtic Roofing Supplies Ltd | Wholesale & retail | 2025 |
| Celtic Utilities Group Limited | Financial services | 2013 |
| Celticcross Trade Connections Ltd | Wholesale & retail | 2025 |
| Celuaris Limited | Manufacturing | 2017 |
| Celutionsuk Limited | Health & social care | 2018 |
| Cemc Electrical Ltd | Construction | 2026 |
| Cendre Limited | Professional & scientific | 2017 |
| Cenfield Limited | Other services | 2018 |
| Cenith Management Consulting LLP | | 2025 |
| Cenniniago Ltd | Health & social care | 2013 |
| Cent Capital Limited | Information & communication | 2025 |
| Cent Furniture Limited | Manufacturing | 2018 |
| Centaur Computer Services Limited | | 1986 |
| Centenaire Ltd | Administrative & support | 2021 |
| Center for Foreign Policy Analysis and International Security, Ltd | Information & communication | 2022 |
| CENTER1SHOP Ltd | Wholesale & retail | 2025 |
| Centirir Ltd | Information & communication | 2025 |
| Centovita Ltd | Wholesale & retail | 2025 |
| Centraca Ltd | Administrative & support | 2014 |
| Central 03 Ltd | Administrative & support | 2021 |
| Central Builders and Scaffolding Services Limited | Construction | 2022 |
| Central Business Solutions Ltd | Administrative & support | 2020 |
| Central Claim Care Ltd | Administrative & support | 2011 |
| Central Digital Services Limited | Professional & scientific | 2026 |
| Central Garage (Llandaff North) Ltd | Wholesale & retail | 2021 |
| Central Garages Transport Ltd | Transport & logistics | 2009 |
| Central Harness Union Ltd | Other services | 2020 |
| Central House International Ltd | Manufacturing | 2015 |
| Central London Estates Group Limited | Real estate | 2016 |
| Central Maintenance Ltd | Construction | 2024 |
| Central Managed Services Group 01 Ltd | Administrative & support | 2021 |
| Central Managed Services Group 02 Ltd | Administrative & support | 2018 |
| Central MK Apartments Ltd | Real estate | 2017 |
| Central Pharma Cardiff Ltd | Wholesale & retail | 2025 |
| Central Pubs and Leisure Ltd | Professional & scientific | 2018 |
| Central Quay Eight Limited | Construction | 2021 |
| Central Quay Management Company Cardiff Ltd | Real estate | 2020 |
| Central Quay Management Company Limited | Real estate | 2022 |
| Central ROW Realty Ltd | Real estate | 2025 |
| Central South Active Partnership Limited | Arts & recreation | 2024 |
| Central ST. Martins Management Company Limited | Real estate | 2012 |
| Central Stays Cardiff Ltd | Real estate | 2026 |
| Central Steam Cleaning Ltd | Administrative & support | 2017 |