| Coatech IT Services Ltd | Information & communication | 2019 |
| Cobalz Limited | Professional & scientific | 2000 |
| Coca Builders Ltd | Construction | 2021 |
| Cocktails N Dreams Ltd | Hospitality | 2011 |
| Code 50 Holdings Limited | Financial services | 2026 |
| Coed Y Glyn Estates Ltd | Households | 2025 |
| Coed-Y-Glyn LOG Cabins Limited | Hospitality | 2016 |
| Coed-Y-Glyn Properties Limited | Real estate | 2023 |
| Coedpoeth Barber Ltd | Other services | 2025 |
| Coedwigaeth Pencelyn Limited | Agriculture & fishing | 2011 |
| Coeus Financial Consultancy Limited | Information & communication | 2011 |
| Coleman's Electrical Limited | Construction | 2005 |
| Coles Commercial Property Management Ltd | Real estate | 2026 |
| Coleys Wrexham Ltd | Wholesale & retail | 2025 |
| Colibri Media UK Ltd | Wholesale & retail | 2023 |
| Colin Davies Cabinet Makers Ltd | Manufacturing | 2022 |
| Colin Fowler Limited | Professional & scientific | 2014 |
| Collectorstash Ltd | Wholesale & retail | 2022 |
| Colour Supplies Limited | Wholesale & retail | 1987 |
| Comarda Marketing Limited | Administrative & support | 2025 |
| Comfg Holdings Ltd | Financial services | 2021 |
| Comfg Limited | Manufacturing | 1988 |
| Coming Computer Engineering Limited | Information & communication | 2020 |
| Commercial & Industrial Gauges Limited | Manufacturing | 1998 |
| Common Sense Safety Solutions Limited | Professional & scientific | 2010 |
| Community Prayer Fellowship International | Other services | 2013 |
| Community Trust and Savings Limited | Financial services | 2012 |
| Complete Flooring & Civils Ltd | Administrative & support | 2026 |
| Complete Supply Chain Services Limited | Administrative & support | 2013 |
| Compliance Aide Ltd | Health & social care | 2022 |
| Concept Paints Ltd | Wholesale & retail | 1998 |
| Condor Publishing Ltd | Information & communication | 2023 |
| Condura Homes Limited | Real estate | 2026 |
| Connect One Ltd | Financial services | 2022 |
| Connectec Limited | Wholesale & retail | 2017 |
| Connected Security Limited | Administrative & support | 2005 |
| Consensus Marketing Limited | Professional & scientific | 2010 |
| Considered Spaces Ltd | Real estate | 2025 |
| Construct Care Ltd | Construction | 2024 |
| Construction Training Group CYF | Education | 2024 |
| Consultancy Tim.E Limited | Real estate | 2020 |
| Consumer Voice Limited | Information & communication | 2023 |
| Contour Marking Limited | Manufacturing | 1995 |
| Contraband Software Ltd | Information & communication | 2025 |
| Conwy Care Ltd | Health & social care | 2022 |
| Coolpoint Ltd | Wholesale & retail | 2000 |
| Coppell's Industrial Concrete Floors Ltd | Construction | 2022 |
| Coppells Holdings Ltd | Financial services | 2025 |
| Copper House Property Ltd | Hospitality | 2018 |
| COR Coaching Limited | Other services | 2005 |
| Coral Reef Business Consultancy Limited | Professional & scientific | 2020 |
| Corbanhill Limited | Real estate | 1977 |
| Core Financial Solutions Ltd | Professional & scientific | 2025 |
| Coresite Ltd | Construction | 2026 |
| Corgi Engineering Ltd | Agriculture & fishing | 2023 |
| Corluma Holdings Limited | Financial services | 2025 |
| Corluma Limited | Financial services | 2025 |
| Corna Storr Ltd | Hospitality | 2023 |
| Corner Cafe Wrexham Ltd | Hospitality | 2025 |
| Corner House Country Cottages Limited | Real estate | 2010 |
| Corner House Holidays Limited | Hospitality | 1994 |
| Corner Turkish Barbers Ltd | Other services | 2026 |
| Cornerstone Consultancy Solutions Limited | Information & communication | 2025 |
| Corr Active Ltd | Wholesale & retail | 2026 |
| Corrina Maclean Ltd | Wholesale & retail | 2017 |
| Cosmo Health Care Agency Limited | Health & social care | 2015 |
| Cosy Sheep Ltd | Hospitality | 2025 |
| Cottam's Construction Limited | Construction | 2026 |
| Country Concrete Products Limited | Manufacturing | 2014 |
| Countryside Greens Limited | Extraterritorial | 1996 |
| County ALL Trades Services Limited | Extraterritorial | 2011 |
| County Landscapes NW Ltd | Administrative & support | 2018 |
| County Laundry and Cleaners (Rhyl) Limited (the) | Professional & scientific | 1931 |
| County Secure Services (UK) Ltd | Administrative & support | 2026 |
| Course Detective Limited | Education | 2020 |
| Courts Food Limited | Hospitality | 2023 |
| Covenant Windows Limited | Construction | 2001 |
| Coverall Tarpaulins Limited | Administrative & support | 2003 |
| Coxeys Limited | Extraterritorial | 2015 |
| Cozy CUP (WR) Limited | Hospitality | 2024 |
| CPC Corporation Limited | Transport & logistics | 2018 |
| Cpoe Holdings Limited | Real estate | 2022 |
| CPR Shopfitting Limited | Construction | 2010 |
| CQ Software Limited | Information & communication | 2025 |
| Cradduck Ltd | Transport & logistics | 2016 |
| Craft & Tails Limited | Hospitality | 2023 |
| Craig Fach Ltd | Administrative & support | 2020 |
| Crane Medical Services Ltd | Health & social care | 2016 |
| Crazy Candy Co Ltd | Wholesale & retail | 2021 |
| CRB Nexus Holdings Ltd | Financial services | 2023 |
| CRB Nexus Ltd | Real estate | 2023 |
| Creative Avionics Solutions Ltd | Professional & scientific | 2026 |
| Creative ROX Ltd | Manufacturing | 2014 |
| Creative Social Work Training & Consultancy Ltd | Professional & scientific | 2025 |
| Creaturekerb Limited | Professional & scientific | 2023 |
| Crescent Holdings Limited | Real estate | 2022 |
| Crest PSC 3340 Limited | Construction | 2007 |
| Creu Arts Limited | Wholesale & retail | 2025 |
| Creuynni Wellbeing CIC | Health & social care | 2025 |
| Crewe Self Storage Limited | Administrative & support | 2013 |