| CG Personnel Ltd | Administrative & support | 2019 |
| CG Television Limited | Information & communication | 2018 |
| CGB Collection Ltd | Manufacturing | 2018 |
| CGM Enterprise Limited | Professional & scientific | 2014 |
| Cgpuk Ltd | Administrative & support | 2017 |
| CGS Offshore Ltd | Professional & scientific | 2018 |
| CGS Recruitment Agency Ltd | Administrative & support | 2006 |
| Cgweng Limited | Information & communication | 2013 |
| Cgwprop Ltd | Financial services | 2019 |
| CH 1 Liverpool Limited | Real estate | 2019 |
| CH 357 Ltd | Wholesale & retail | 2025 |
| CH Consultancy Midlands Limited | Professional & scientific | 2018 |
| CH Sport Limited | Other services | 2017 |
| CH4 GAS Utility and Maintenance Services Limited | Professional & scientific | 2011 |
| CH4FM Group Ltd | Construction | 2019 |
| CH7 Properties Limited | Real estate | 2026 |
| Chaada & SON Ltd | Financial services | 2019 |
| Chachaquack Enterprise Holding Co., Ltd | Information & communication | 2021 |
| Chad Love Media Ltd | Information & communication | 2024 |
| Chadbrook Limited | Construction | 2023 |
| Chaddy.Jeanne Cleaning Services Limited | Administrative & support | 2016 |
| Chadhar's Brothers Limited | Real estate | 2024 |
| Chafafia Media Network Ltd | Manufacturing | 2019 |
| Chafik Design Ltd | Construction | 2019 |
| Chafikgraphics Ltd | Wholesale & retail | 2021 |
| Chag (Coppenhall) Limited | Real estate | 2022 |
| Chag (Narberth) Limited | Real estate | 2022 |
| Chai (SW) Limited | Hospitality | 2025 |
| Chaichai Limited | Hospitality | 2025 |
| Chaii Adda Cardiff Ltd | Hospitality | 2026 |
| Chaiibots Ltd | Hospitality | 2025 |
| Chaiiology Cardiff Ltd | Hospitality | 2024 |
| Chain International Ltd. | Extraterritorial | 2018 |
| Chain Krypton Ltd | Wholesale & retail | 2025 |
| Chain Sense Ltd | Information & communication | 2020 |
| Chaindex Insights Ltd | Professional & scientific | 2025 |
| Chair Freelance Ltd | Education | 2022 |
| Chair Salons Limited | Other services | 2017 |
| Chako Ltd | Information & communication | 2024 |
| Chalcott Limited | Households | 2000 |
| Chalfonte Healthcare Limited | Health & social care | 2015 |
| Chalk Hills Healthcare Ltd | Administrative & support | 2015 |
| Challenger Homes (Lower Broughton) Ltd | Construction | 2022 |
| Challenger Homes (Swinton) Ltd | Construction | 2022 |
| Challenger PR Ltd | Administrative & support | 2016 |
| Challenging Production Ltd | Information & communication | 2011 |
| Challis Group Holdings Ltd | Financial services | 2024 |
| Challis Group Ltd | Health & social care | 2022 |
| Challis Property Group Limited | Real estate | 2024 |
| Chamberlains Security (Cardiff) Ltd | Administrative & support | 2005 |
| Chambers Logistics Ltd | Transport & logistics | 2019 |
| Chameleon Catering Ltd | Professional & scientific | 2025 |
| Chameleon Consultancy Solutions Limited | Information & communication | 2017 |
| Chameleon Create Limited | Manufacturing | 2017 |
| Chameleon Group Ltd | Hospitality | 2020 |
| Chameleon Marketing Services Limited | Professional & scientific | 2016 |
| Chames Eddine Charef Ltd | Financial services | 2025 |
| Chamilia PC | | 2014 |
| Chammas Consulting Limited | Administrative & support | 2017 |
| Champ TV Ltd | Information & communication | 2017 |
| Champ UP Ltd | Information & communication | 2019 |
| Champion Rail Solutions Ltd | Construction | 2014 |
| Champion Shutters and Blinds Limited | Wholesale & retail | 2023 |
| Champion Sound Ltd | Information & communication | 2007 |
| Champions Box Limited | Wholesale & retail | 2025 |
| Chamugu Limited | Manufacturing | 2021 |
| Chan's Pharma Ltd | Wholesale & retail | 2021 |
| Chancastle Ltd | Wholesale & retail | 2019 |
| Chance and Counters Cardiff Limited | Hospitality | 2018 |
| Chance Corporate Services UK Limited | Administrative & support | 2023 |
| Chancery Properties and Management Ltd. | Real estate | 2019 |
| Chand Engineering Ltd | Professional & scientific | 2017 |
| Chandler's Quay 1 RTM Company Limited | Households | 2025 |
| Chandni Chowk Banqueting Hall Ltd | Hospitality | 2019 |
| Chandni Chowk Catering Ltd | Hospitality | 2018 |
| Chandni Chowk Food Village Limited | Hospitality | 2017 |
| Chandra Shanker Ltd | Real estate | 2025 |
| Change My Boiler Ltd | Construction | 2021 |
| Changelot Property Management Limited | Households | 1990 |
| Changemotive Limited | Wholesale & retail | 1991 |
| Changing Style Ltd | Other services | 2019 |
| Chango Logistics Ltd | Transport & logistics | 2018 |
| Changsha Vcho Pharma Tech Co., Ltd | Administrative & support | 2020 |
| Changyuan Tranding Limited | Wholesale & retail | 2025 |
| Chang’S WOK Ltd | Hospitality | 2025 |
| Chanlen Trade Limited | Manufacturing | 2025 |
| Channel 3 Consulting Ltd | Information & communication | 2009 |
| Channel 44 Limited | Information & communication | 2019 |
| Channel Business Finance Limited | Financial services | 2023 |
| Channel Cable Ltd | Energy | 2009 |
| Channelafro Ltd | Information & communication | 2020 |
| Channings Cardiff Limited | Wholesale & retail | 2003 |
| Chans Catering Limited | Hospitality | 2023 |
| Chans Plus Limited | Hospitality | 2021 |
| Chansnoodlebar Limited | Hospitality | 2021 |
| Chanvrepur Holding Ltd | Financial services | 2022 |
| Chaohanahfha Limited | Wholesale & retail | 2026 |
| Chaoshuo Trading Co., Ltd | Wholesale & retail | 2025 |
| CHAP365 | Administrative & support | 2025 |
| Chapel Gardens Ltd | Construction | 2025 |