| Courtyard Electronics Limited | Manufacturing | 1985 |
| Coverit Ltd | Manufacturing | 2016 |
| Cowley Family Funerals Ltd | Other services | 2020 |
| Cowley Sales Consultancy Ltd | Professional & scientific | 2023 |
| Cowling Holdings Limited | Construction | 2020 |
| Coyte & Coyte Ltd | Professional & scientific | 2024 |
| COZ We'R Organized Ltd | Construction | 2007 |
| Cozyhomes (South Wales) Limited | Real estate | 2024 |
| CPA Developments Ltd | Construction | 2025 |
| Cparry Marketing Ltd | Professional & scientific | 2023 |
| CPD Circle Limited | Education | 2020 |
| Cpgksa Limited | Administrative & support | 2024 |
| CPR Global Ltd | Information & communication | 2010 |
| CPR Global Tech Ltd | Information & communication | 2010 |
| CPR Reach Ltd | Information & communication | 2024 |
| CPR Rentals Limited | Real estate | 2020 |
| CPS Construction Ltd | Construction | 2021 |
| CRA BJJ Ltd | Arts & recreation | 2018 |
| CRA Fitness & Martial Arts Ltd | Arts & recreation | 2016 |
| CRA Kids Ltd | Education | 2017 |
| Craft Mixology Ltd | Hospitality | 2016 |
| Crafted Property Group Ltd | Real estate | 2026 |
| Craftsea Ltd | Arts & recreation | 2025 |
| Craftsmen Building & Property Services Limited | Construction | 2003 |
| Craftsmen Elite Ltd | Construction | 2023 |
| Craig CCP Ltd | Wholesale & retail | 2025 |
| Craig CCP Stores Ltd | Wholesale & retail | 2025 |
| Craig LAS Group Limited | Construction | 2020 |
| Craig Lewis Consulting Ltd | Professional & scientific | 2025 |
| Craigydwi Ltd | Information & communication | 2020 |
| Cranfields Consulting Ltd | Information & communication | 2026 |
| Craven Cooling Sales Limited | Wholesale & retail | 2019 |
| Craven Cooling Services Ltd | Other services | 2017 |
| Crawley Optical Services Ltd | Health & social care | 2021 |
| Crawleywood Limited | Administrative & support | 2017 |
| Cray Properties (UK) Limited | Financial services | 2003 |
| Crazy Cravings Ltd | Hospitality | 2025 |
| Crazy Events Ltd | Arts & recreation | 2025 |
| CRB and Sons Trading Ltd | Construction | 2026 |
| CRC (Merthyr Tydfil) Limited | Hospitality | 2007 |
| CRC Group Limited | Financial services | 2018 |
| Create Business Solutions Limited | Professional & scientific | 2018 |
| Create Interiors South Wales Ltd | Construction | 2025 |
| Create Locate Properties Ltd | Real estate | 2022 |
| Creately Ltd | Information & communication | 2015 |
| Creatingflow Limited | Professional & scientific | 2012 |
| Creative Brewery OPS Ltd | Hospitality | 2022 |
| Creative Dining Limited | Hospitality | 2019 |
| Creative Hospitality Group Ltd | Administrative & support | 2011 |
| Creative Hospitality Holding Services Ltd | Professional & scientific | 2025 |
| Creative Hospitality Holdings (Swansea) Limited | Financial services | 2021 |
| Creative Projects U.K. Limited | Manufacturing | 1997 |
| Creative Security Services Ltd | Administrative & support | 2012 |
| Creche Properties Limited | Real estate | 2016 |
| Crees Properties Limited | Real estate | 2011 |
| Crescent Dental Ltd | Health & social care | 2016 |
| Cresecop Ltd | Administrative & support | 2026 |
| Crest Ceilings & Partitions Limited | Construction | 2011 |
| Crestvill Limited | Arts & recreation | 2005 |
| Creu Labs Ltd | Information & communication | 2025 |
| Crewconnect RPO Ltd | Administrative & support | 2025 |
| Crewders Ltd | Wholesale & retail | 2023 |
| Cribarth Carpentry Ltd | Manufacturing | 2026 |
| Cribarth Kennels Ltd | Agriculture & fishing | 2012 |
| Cricketers' Blend Ltd | Hospitality | 2025 |
| Cridco Limited | Wholesale & retail | 2023 |
| Cripslock & Co Ltd | Professional & scientific | 2025 |
| Crispy COD (Neath) Limited | Hospitality | 2022 |
| Crispy Johns Limited | Hospitality | 2022 |
| Cristina's Wellbeing Chiropractic Ltd | Public administration | 2024 |
| CRJ Consultancy Limited | Professional & scientific | 2025 |
| CRJ Electrical (South Wales) Limited | Energy | 2023 |
| CRK Developments Limited | Professional & scientific | 2017 |
| Crockers Building Limited | Construction | 2024 |
| Crockz Rainbow Bulliez Limited | Agriculture & fishing | 2019 |
| Crocodile Rock Bars Ltd | Hospitality | 2026 |
| Croft Acre Holiday Cottages Limited | Administrative & support | 2010 |
| Crofty Holdings Limited | Wholesale & retail | 2018 |
| Crollman Property Investments Ltd | Real estate | 2020 |
| Cromwell Flats Management Co. Limited | Real estate | 1996 |
| Cross & Bowen Ltd | Professional & scientific | 2003 |
| Cross & Bowen Management Limited | Professional & scientific | 2012 |
| Cross Hands Well Engineering Ltd | Professional & scientific | 2018 |
| Cross House Inn Ltd | Hospitality | 2014 |
| Cross Pharmacy (Loughor) Limited(The) | Professional & scientific | 1964 |
| Crossfit SA1 Limited | Arts & recreation | 2016 |
| Crossing Point Investment Management Limited | Financial services | 2013 |
| Crossing Point Wealth Management Ltd | Financial services | 2025 |
| Crossroads Clinic Ltd | Administrative & support | 2015 |
| Crowley Creations Ltd | Other services | 2019 |
| Crowley's Bars Ltd | Hospitality | 2024 |
| Crown (Crime Solutions) Ltd | Administrative & support | 2006 |
| Crown Building & Construction Ltd | Extraterritorial | 2015 |
| Crown Building Contractors Ltd | Construction | 2025 |
| Crown Group Solutions Limited | Administrative & support | 2010 |
| Crownhawk Properties (2002 ) Limited | Real estate | 2002 |
| Crownhawk Properties Limited | Real estate | 1999 |
| Crowsfoot Heating Services Ltd | Construction | 2022 |
| CRS Facility Management Ltd | Administrative & support | 2017 |
| Crucible Projects Limited | Real estate | 2024 |