| City Anchor Care Services Ltd | Health & social care | 2025 |
| City Build MCR Ltd | Construction | 2021 |
| Cityroot Investments Ltd | Real estate | 2025 |
| CJ Vans Limited | Administrative & support | 2022 |
| CK Ropes Ltd | Wholesale & retail | 2025 |
| CL Joinery & Maintenance Limited | Construction | 2022 |
| Clarendons.A.L.T Ltd | Hospitality | 2022 |
| Clario Ordo Ltd | Wholesale & retail | 2025 |
| Clarkes Bespoke Design Limited | Professional & scientific | 2014 |
| Clarkes Bespoke Development Ltd | Construction | 2024 |
| Clarkes Bespoke Holdings Ltd | Financial services | 2024 |
| Clarke’S Property Holdings Ltd | Real estate | 2026 |
| Classic 27 Ltd | Wholesale & retail | 2026 |
| Classic American Sports Ltd | Extraterritorial | 2019 |
| Classic Football Company Limited | Wholesale & retail | 2006 |
| Classic Football Shirts Limited | Extraterritorial | 2015 |
| Classic Football Shops Limited | Extraterritorial | 2018 |
| Claylands NW Ltd | Administrative & support | 2026 |
| Cleaning Stuff Limited | Administrative & support | 2024 |
| Clifford Whittaker Limited | Financial services | 1985 |
| Clinch Couture Ltd | Wholesale & retail | 2025 |
| Clobber.D Ltd | Wholesale & retail | 2025 |
| Cloggis Ltd | Wholesale & retail | 2011 |
| Close Wood Restorations Limited | Construction | 2025 |
| Cloudprotect Limited | Information & communication | 2010 |
| Clough END Kennels Limited | Administrative & support | 2021 |
| Clough Fields Management Limited | Households | 1990 |
| Clough Valley Properties Ltd | Construction | 2025 |
| Clover Consulting Group Limited | Professional & scientific | 2024 |
| CMA Healthcare Limited | Health & social care | 2022 |
| CNC Heads Limited | Wholesale & retail | 2016 |
| CNC Machining Services Limited | Professional & scientific | 2017 |
| Coachfinder Limited | Transport & logistics | 1998 |
| Coalition of Kindness CIC | Hospitality | 2023 |
| Coating Services Limited | Construction | 1999 |
| Cobweb Restoration Services Limited | Wholesale & retail | 2009 |
| Coleherne Limited | Manufacturing | 1905 |
| Coleherne Trading Group Limited | Wholesale & retail | 1978 |
| Colivinguk Ltd | Real estate | 2020 |
| Collaborate-Create Limited | Professional & scientific | 2023 |
| Collective Systems Limited | Information & communication | 2008 |
| Collective Travel Limited | Administrative & support | 2017 |
| Comfortos Ltd | Wholesale & retail | 2019 |
| Command Line Clothing Ltd | Wholesale & retail | 2022 |
| Commerce Partners Ltd | Wholesale & retail | 2026 |
| Commercial Accounting Solutions Limited | Professional & scientific | 2014 |
| Community Medics CIC | Education | 2025 |
| Community Safety Matters C.I.C. | Information & communication | 2019 |
| Community Wealth Builders Ltd | Professional & scientific | 2021 |
| Compare Invoice Finance.Com Limited | Financial services | 2016 |
| Complete Brickwork & Scaffolding Limited | Construction | 2024 |
| Complete Financial Solutions NW Ltd | Financial services | 2016 |
| Complete KOI and Aquatics Ltd | Wholesale & retail | 2019 |
| Complete Signage Ltd | Construction | 2023 |
| Compliance Training Limited | Other services | 2018 |
| Compstall GC Limited | Wholesale & retail | 2013 |
| Concise Design Ltd | Professional & scientific | 2019 |
| Confidence for Life Limited | Other services | 2013 |
| Connect Home (MCR) Ltd | Real estate | 2025 |
| Connectsportswear Ltd | Wholesale & retail | 2020 |
| Conspicuous Marketing Ltd | Professional & scientific | 2013 |
| Construction Site Logistics Services Ltd | Professional & scientific | 2021 |
| Consula Group Ltd | Administrative & support | 2026 |
| Consula Recruitment Ltd | Administrative & support | 2026 |
| Contact Accounts UK Limited | Professional & scientific | 2008 |
| Contact Flooring Group Ltd | Construction | 2024 |
| Contact Media Ltd | Information & communication | 2021 |
| Contarps (North West) Limited | Manufacturing | 1977 |
| Content With Maria Ltd | Professional & scientific | 2025 |
| Contract Substitutions Limited | Information & communication | 2007 |
| Conveyancing Supermarket Limited | Professional & scientific | 2009 |
| Convincing TV Limited | Information & communication | 2014 |
| Cookson's Consultancy Ltd | Professional & scientific | 2020 |
| Corebuild Property Solutions Ltd | Construction | 2026 |
| Corroless Northern Limited | Manufacturing | 2022 |
| Cosy Toes Nursery Limited | Health & social care | 2004 |
| Cosytoes Childcare Limited | Education | 2006 |
| Cotton Court Properties Limited | Other services | 2019 |
| Cowries Money Limited | Information & communication | 2025 |
| Coyote Coatings Ltd | Manufacturing | 2016 |
| Cozy Homes Holiday Limited | Real estate | 2023 |
| CR LPG Services Limited | Construction | 2020 |
| Craftmode Ltd | Wholesale & retail | 2023 |
| Crafty Rebbits Ltd | Wholesale & retail | 2025 |
| Crasbart Property Ltd | Real estate | 2024 |
| Creative Clay Ltd | Manufacturing | 2010 |
| Creative Inclusion Limited | Administrative & support | 2017 |
| Creative Tile Solutions Ltd | Construction | 2022 |
| Credit Support Services Ltd | Professional & scientific | 2018 |
| Crucial Crew Limited | Information & communication | 2018 |
| Cryptohub International Ltd | Financial services | 2025 |
| CSH Electrical Services Ltd | Construction | 2016 |
| CSS Academy Limited | Arts & recreation | 2024 |
| Cumbermould Properties Ltd | Professional & scientific | 2026 |
| Cura Holistic Care Ltd | Health & social care | 2025 |
| Curtis Builders Limited | Construction | 2002 |
| Curvy Riders MCC | Arts & recreation | 2020 |
| Customtrial Limited | Other services | 1994 |
| CUT Through Comms & Consulting Limited | Information & communication | 2026 |
| Cutting Corners Mitre Makers Limited | Manufacturing | 2012 |