| Brynbuild Holdings Limited | Administrative & support | 2024 |
| Brynbuild Limited | Construction | 2011 |
| Bryntirion Associates Ltd | Other services | 2018 |
| Buarth Bach Limited | Real estate | 2021 |
| Budgerty Limited | Information & communication | 2023 |
| Bunlicious Ltd | Hospitality | 2025 |
| Business Accounting Solutions Ltd | Professional & scientific | 2010 |
| Bwlch Gwyn Wind Farm Limited | Energy | 2021 |
| BWM Rentals Limited | Real estate | 2019 |
| BY Buddy Ltd | Wholesale & retail | 2021 |
| C & D Heating and Cooling Services Ltd | Construction | 2024 |
| C & D Homes Limited | Construction | 2015 |
| C E Wynne Limited | Administrative & support | 2015 |
| C LEE Building Ltd | Other services | 2025 |
| C. D. I. Plumbing & Heating Ltd | Professional & scientific | 2011 |
| C.J Property Partners Ltd | Real estate | 2025 |
| Cabeyes Ltd | Professional & scientific | 2020 |
| Cadia Construction Ltd | Construction | 2025 |
| CAE Rhug Holistic Farm Limited | Education | 2020 |
| CAE Rhys Holiday Park Limited | Hospitality | 2023 |
| Cae-Glas Management Company Limited | Households | 2000 |
| Caerwys Agricultural Show Ltd | Other services | 2023 |
| Caerwys Pharmacy Practice Limited | Wholesale & retail | 2023 |
| Caerwys Veterinary Surgery Limited | Professional & scientific | 2017 |
| Caffi ISA Community Interest Company | Hospitality | 2016 |
| Calentica Ltd | Construction | 2011 |
| Calgreen Freeholds Ltd | Real estate | 2024 |
| Calgreen Homes Ltd | Real estate | 2024 |
| Calon Kitchens Limited | Manufacturing | 2019 |
| Cambrian Chambers Limited | Real estate | 2012 |
| Camddwr Canine Limited | Wholesale & retail | 2007 |
| Camden London Ltd | Extraterritorial | 2018 |
| Camp Coed Ltd | Hospitality | 2025 |
| Campfire Enterprise | Education | 2012 |
| Cams Lettings Ltd | Real estate | 2026 |
| Cams Property Group Ltd | Households | 2024 |
| Canolfannau Cynghori SIR Y Fflint, Flintshire Citizens Advice Bureaux | Health & social care | 2000 |
| Canter Equestrian Ltd | Wholesale & retail | 2015 |
| Capital Engineering Limited | Professional & scientific | 2016 |
| Cappelli Hair Studio Ltd | Other services | 2016 |
| Capper & Jones Ltd | Professional & scientific | 2012 |
| Car Aircon Services Ltd. | Wholesale & retail | 2009 |
| Carer Ventures Ltd. | Financial services | 2017 |
| Carl Harley Property Ltd | Administrative & support | 2016 |
| Carl Mason , Carlosm Limited | Arts & recreation | 2024 |
| Carlin Partnership Ltd | Administrative & support | 2019 |
| Carreg Hire Ltd | Administrative & support | 2025 |
| Carreg Holdings Ltd | Agriculture & fishing | 2021 |
| Cartrefi Llew Coch CYF. | Real estate | 2020 |
| Case Managers Ltd | Health & social care | 2013 |
| CC JAS Accounting Ltd | Administrative & support | 2011 |
| CCA Land Ltd | Real estate | 2016 |
| CD Technical Engineering Ltd | Transport & logistics | 2017 |
| Cdgc Properties Ltd | Construction | 2020 |
| CEI Meadows Ltd | Real estate | 2022 |
| Celtic Business Holdings Limited | Financial services | 2025 |
| Celtic Business Property Holdings Limited | Financial services | 2026 |
| Celtic Financial Planning Ltd | Financial services | 2018 |
| Celtic Law Limited | Professional & scientific | 2016 |
| Celtic Stone NW Limited | Manufacturing | 2025 |
| Certain Pictures Limited | Information & communication | 2004 |
| Charisma Barber Shop Ltd | Other services | 2026 |
| Charm Design Ltd | Professional & scientific | 2021 |
| Chcs International Limited | Professional & scientific | 2015 |
| Chefs Dairy Ltd | Wholesale & retail | 2024 |
| Chemlabel Limited | Information & communication | 2015 |
| Chemsafe Limited | Professional & scientific | 2005 |
| Chemsoft Eh&S Ltd | Information & communication | 2022 |
| Chemsoft Group Limited | Information & communication | 2015 |
| Chemware Limited | Information & communication | 2015 |
| Cherise Amore Salon Ltd | Other services | 2021 |
| Chester Accommodation Limited | Hospitality | 2023 |
| Chester Festival of Performing Arts Ltd | Arts & recreation | 2004 |
| Chester Newgate Properties Limited | Real estate | 1960 |
| Chester Services Partnership Limited | Information & communication | 2013 |
| Chester Tour Company Ltd | Arts & recreation | 2023 |
| Chester Visual Arts | Arts & recreation | 2017 |
| Christmas Count Ltd | Wholesale & retail | 2021 |
| Christos Coaching Limited | Other services | 2023 |
| Chukkatracker Ltd | Information & communication | 2024 |
| Cittaslow UK CIC | Other services | 2009 |
| CKK Developments Ltd | Construction | 2025 |
| CL Davies Services Limited | Professional & scientific | 2026 |
| Clare's Counselling Ltd | Health & social care | 2022 |
| Clarion Payroll Services Limited | Professional & scientific | 2022 |
| Clarion People Limited | Professional & scientific | 2017 |
| Clarity Virtual Accounting Ltd | Professional & scientific | 2012 |
| Clarity Virtual Ltd | Professional & scientific | 2003 |
| Clawdd Newydd Limited | Construction | 2020 |
| Clear Path Energy Engineering Consultants Ltd | Professional & scientific | 2023 |
| Cleared With Care Ltd | Water & waste | 2023 |
| Clic Creative Limited | Professional & scientific | 2011 |
| Clickery Financial Ltd | Financial services | 2015 |
| Clinical Care Connect Ltd | Health & social care | 2025 |
| Clinical CME Group Ltd | Professional & scientific | 2022 |
| Cliqs Marketing Limited | Information & communication | 2024 |
| CLL Consultancy Ltd | Professional & scientific | 2026 |
| Clwyd Brickwork Ltd | Construction | 2014 |
| Clwyd Communications Ltd | Information & communication | 2026 |
| Clwyd Environmental Services Ltd | Administrative & support | 2017 |