| Churchill News Ltd | Wholesale & retail | 2014 |
| Churchills Haulage Ltd | Administrative & support | 2016 |
| Ciao Napoli Pizzeria Ltd | Hospitality | 2024 |
| Ciel Maison Ltd | Real estate | 2023 |
| Cigre UK Limited | Professional & scientific | 2024 |
| Cillache Ltd | Health & social care | 2023 |
| Cimasafety Limited | Financial services | 2024 |
| Cimtek Engineering Ltd | Professional & scientific | 2016 |
| CIP Keysfin Limited | Transport & logistics | 2022 |
| Circle of Law Limited | Professional & scientific | 2018 |
| Circle Waste Ltd | Water & waste | 2018 |
| Circlemount Ltd | Professional & scientific | 2022 |
| Citiplanners Limited | Financial services | 2016 |
| Citizen Engagement C.I.C. | Professional & scientific | 2011 |
| City Greens Foodtech Ltd | Agriculture & fishing | 2024 |
| City Insulation Contractors Limited | Construction | 1986 |
| CJ Fabrication and Welding Services Ltd | Manufacturing | 2024 |
| CJ Williams Investments LLP | | 2014 |
| CJJ Health & Safety Services Ltd | Professional & scientific | 2022 |
| CJW Trading Ltd | Wholesale & retail | 2014 |
| CKB Contracting Ltd | Construction | 2026 |
| CKL Office Solutions Limited | Wholesale & retail | 2006 |
| CKQ Consulting Ltd | Administrative & support | 2025 |
| CKR Building Solutions Ltd | Administrative & support | 2025 |
| Claimpoint Limited | Professional & scientific | 2011 |
| Claims Specialists (Shropshire) Hire Ltd | Administrative & support | 2018 |
| Claims Specialists (Shropshire) Limited | Other services | 2011 |
| Claire Louise Does Limited | Wholesale & retail | 2024 |
| Claremont Developments (Shropshire) Ltd | Construction | 2020 |
| Claremont Mews Management Company Limited | Households | 1990 |
| Clarity Computer Systems Limited | Manufacturing | 2019 |
| Clarity Poolcare Ltd | Construction | 2022 |
| Clarke Delta Limited | Professional & scientific | 2015 |
| Clarkes Limited | Professional & scientific | 2008 |
| Clarkes LLP | | 2008 |
| Clarkes Safety Mirrors Limited | Manufacturing | 2006 |
| Clarkes Solicitors Limited | Professional & scientific | 2008 |
| Clarkes Solicitors LLP | | 2008 |
| Class-Photos Limited | Professional & scientific | 2009 |
| Classic Acoustics Limited | Manufacturing | 1998 |
| Classic and Classy Motorcycles Ltd | Wholesale & retail | 2019 |
| Classic Carpentry (Shropshire) Limited | Administrative & support | 2012 |
| Classic Property Services Ltd | Real estate | 2021 |
| Classy Homes Limited | Real estate | 2021 |
| Claxton Care Ltd | Public administration | 2024 |
| Clayton UK International Aviation Limited | Wholesale & retail | 2019 |
| Clean Solar Solutions Franchises Ltd | Administrative & support | 2023 |
| Clean Solar Solutions Limited | Administrative & support | 2013 |
| Clean Start Contract Services Limited | Administrative & support | 2017 |
| Clean With Ease Ltd | Administrative & support | 2023 |
| Clean+Solution Ltd | Administrative & support | 2025 |
| Cleaning Heroes Ltd | Administrative & support | 2025 |
| Cleanit Cleaning Services (Staffordshire) Ltd | Administrative & support | 2008 |
| Cleanland Telford Ltd | Administrative & support | 2024 |
| Cleanlynk Ltd | Manufacturing | 2025 |
| Cleanspace Keepers Cleaning Ltd | Administrative & support | 2026 |
| Clear Accountancy & Tax Limited | Extraterritorial | 2025 |
| Clear Accountancy (Inc. Nira Smith Accounts) Limited | Professional & scientific | 2017 |
| Clear Accountancy Services Holdings Limited | Extraterritorial | 2015 |
| Clear Accountancy Services Ltd | Professional & scientific | 2010 |
| Clear Cashflow Solutions Ltd | Financial services | 2022 |
| Clear Fire Safety Solutions Limited | Professional & scientific | 2019 |
| Clear Path Business Services Limited | Professional & scientific | 2026 |
| Clearfone Ltd | Information & communication | 2024 |
| Clearscan Radiology Limited | Professional & scientific | 2024 |
| Clearskin Labs Limited | Wholesale & retail | 2026 |
| Clearview Psychology Ltd | Extraterritorial | 2021 |
| Clearview Security Ltd | Administrative & support | 2013 |
| Cleetek Consulting Ltd | Information & communication | 2019 |
| Cleveland Cleaning Limited | Administrative & support | 2004 |
| Clever Digital Limited | Wholesale & retail | 2011 |
| Clic Training and Development Ltd | Professional & scientific | 2018 |
| Click 57 Limited | Wholesale & retail | 2011 |
| Clicky HUT Ltd | Wholesale & retail | 2019 |
| Clientcore Support Ltd | Administrative & support | 2025 |
| Cliftons Developments Ltd | Construction | 2018 |
| Clinical Imaging IT Ltd | Professional & scientific | 2025 |
| Clinician Central Ltd | Health & social care | 2025 |
| Clock Tower Inn PUB Ltd | Hospitality | 2025 |
| Closed Circuit Cooling Limited | Manufacturing | 1979 |
| Cloud Construct Ltd | Information & communication | 2012 |
| Clover Business Management Ltd | Professional & scientific | 2020 |
| Cloverley Plantscapes LLP | | 2013 |
| Club 0 - 5 Ltd. | Education | 1997 |
| Cludde Limited | Extraterritorial | 2011 |
| Clun Valley Nursery Limited | Agriculture & fishing | 2025 |
| Clusterclean Limited | Manufacturing | 2009 |
| Clutton Homes Cheshire Cheese Limited | Construction | 2020 |
| Clutton Homes Doseley Limited | Construction | 2019 |
| Clutton Homes Hinkshay Limited | Construction | 2019 |
| Clutton Homes Tara LLP | | 2013 |
| CMD Limited | Manufacturing | 1988 |
| CMH Enterprises Ltd. | Extraterritorial | 2015 |
| CML F & L [Telford] Ltd | Transport & logistics | 2008 |
| CMO Financial Limited | Financial services | 2014 |
| CMS 9SPEED Repairs Limited | Wholesale & retail | 2017 |
| CMS Wings & Wheels Ltd | Wholesale & retail | 2021 |
| CMT Transport Limited | Transport & logistics | 2017 |
| Cmva - Limited | Professional & scientific | 2019 |
| CN Cleaning Services Ltd | Administrative & support | 2020 |