| City Watch Holdings Ltd | Financial services | 2025 |
| Citystyle Online Ltd | Wholesale & retail | 2024 |
| Ciws International Ltd | Professional & scientific | 2019 |
| CJ Detailing Ltd | Administrative & support | 2026 |
| CJL Cladding Ltd | Construction | 2011 |
| CJL Energy Services Ltd | Professional & scientific | 2025 |
| CKC Installations Ltd | Construction | 2019 |
| Claim Care London Ltd | Construction | 2026 |
| Clansman Holdings Limited | Real estate | 2020 |
| Clarendon Freight Limited | Transport & logistics | 2002 |
| Claudia's Limited | Other services | 2012 |
| Clayton Barker Property Limited | Households | 2020 |
| Clayton Barker Tavern Operations Ltd | Hospitality | 2021 |
| Clayton Barker Taverns Ltd | Real estate | 2021 |
| Clayton Surreal Ltd | Administrative & support | 2023 |
| Clean Storm Limited | Other services | 2018 |
| Cleaning Solutions (Midlands) Limited | Administrative & support | 2021 |
| Clear House Property Services Ltd | Households | 2023 |
| Clear Water Strategies Ltd | Professional & scientific | 2024 |
| Cleddau Trading Ltd | Hospitality | 2019 |
| Clinical Polymer Technologies Ltd. | Manufacturing | 2005 |
| Clinipol Holdings Ltd | Manufacturing | 2014 |
| Clinipol Trustees Limited | Administrative & support | 2020 |
| Cloud-Bee-Net Ltd | Information & communication | 2025 |
| Cloudscape Connect Limited | Information & communication | 2014 |
| Clubhouse Group Limited | Hospitality | 2019 |
| Clubhouse JIU Jitsu Ltd | Arts & recreation | 2022 |
| Clulow Bookkeeping & Forensic Services Limited | Professional & scientific | 2015 |
| Clynchmob Ltd | Arts & recreation | 2020 |
| CM (Ashby) Ltd | Administrative & support | 2022 |
| CM Sports Management Limited | Arts & recreation | 2010 |
| CM3 Electrical Contractors Ltd | Construction | 2025 |
| CMH Capability Limited | Professional & scientific | 2021 |
| CMS Cepcor (Holdings) Limited | Financial services | 2017 |
| CMS Cepcor Limited | Mining & quarrying | 1989 |
| CN Enterprise Ltd | Wholesale & retail | 2022 |
| CNL Minerals Limited | Professional & scientific | 1994 |
| Coalville and District Constitutional Club Company Limited(The) | Real estate | 1896 |
| Coalville Car Sales Ltd | Wholesale & retail | 2024 |
| Coalville Cleaning Services Limited | Administrative & support | 2003 |
| Coalville Commercial Investment Ltd | Real estate | 2024 |
| Coalville Community Publishing CIC | Wholesale & retail | 2025 |
| Coalville Community Workshop C.I.C. | Administrative & support | 2023 |
| Coalville Crust Ltd | Hospitality | 2026 |
| Coalville Cycles Limited | Manufacturing | 2011 |
| Coalville Decorator Centre Limited | Wholesale & retail | 2004 |
| Coalville Exports Ltd | Wholesale & retail | 2026 |
| Coalville Fish Bar Ltd | Hospitality | 2016 |
| Coalville Garden Services Ltd | Wholesale & retail | 2019 |
| Coalville Grill Food Ltd | Hospitality | 2019 |
| Coalville Haulage Limited | Transport & logistics | 2021 |
| Coalville Kitchens & Bedrooms Limited | Construction | 2011 |
| Coalville Mini Market INT Ltd | Wholesale & retail | 2025 |
| Coalville MOT Centre Ltd | Manufacturing | 2004 |
| Coalville News Ltd | Wholesale & retail | 2018 |
| Coalville Signs Limited | Manufacturing | 2018 |
| Coalville Tanning Limited | Other services | 2024 |
| Coalville Town Amateur Boxing Club CIC | Education | 2026 |
| Coalville Town Team Limited | Administrative & support | 2012 |
| Coalville Tyre & Exhaust Limited | Wholesale & retail | 2002 |
| Coalville Vehicle Services Ltd | Wholesale & retail | 2016 |
| Coalville Windows Ltd | Construction | 2024 |
| COALVILLEDOOR2DOORSTORAGE Ltd | Transport & logistics | 2019 |
| Coeus Smart Technology Ltd | Information & communication | 2020 |
| Coleorton Hall Freehold Limited | Households | 2010 |
| Coleorton Hall Management Company Limited | Households | 2003 |
| Coligny Ltd | Other services | 2022 |
| Collie Consultancy Ltd | Extraterritorial | 2020 |
| Comberford Hall Developments Limited | Real estate | 2010 |
| Comeplay Games Ltd | Information & communication | 2025 |
| Comm-Networks Limited | Administrative & support | 2025 |
| Commercial Vehicle Movements Limited | Transport & logistics | 2000 |
| Commercial Vehicle Sales Direct Ltd | Wholesale & retail | 2017 |
| Community Careline N W L Limited | Other services | 2008 |
| Community Chest Limited | Financial services | 2015 |
| Community Convenience Group Ltd | Wholesale & retail | 2021 |
| Complete Build & Landscapes Ltd | Construction | 2022 |
| Complete Fire Safe Ltd | Public administration | 2024 |
| Complete Foot Care Coalville Ltd | Health & social care | 2025 |
| Complete Health and Protection Ltd | Financial services | 2019 |
| Composites Innovation Group Ltd | Financial services | 2014 |
| Consoleting Ltd | Extraterritorial | 2021 |
| Construction Fixings Association | Other services | 2007 |
| Consult Design Manage Limited | Construction | 2017 |
| Consultavila Partners Limited | Professional & scientific | 2022 |
| Consultiv Limited | Information & communication | 2014 |
| Continuity Assured Limited | Information & communication | 2008 |
| Conversion Collective Ltd | Professional & scientific | 2025 |
| Cooper Lennard Bartlett Ltd | Construction | 2025 |
| Cope and Reid Ltd | Construction | 2003 |
| Copper Top Engineering Ltd | Professional & scientific | 2025 |
| COR Properties Limited | Real estate | 2024 |
| Coral Bowden Limited | Professional & scientific | 2020 |
| Corby Cedars Management Company Ltd | Real estate | 2021 |
| Corner Express Stores Ltd | Wholesale & retail | 2021 |
| Corner Smaku Ltd | Manufacturing | 2025 |
| Corny Furniture Ltd | Manufacturing | 2018 |
| Corry and Company,Limited | Professional & scientific | 1880 |
| Costy & Sofia Ltd | Transport & logistics | 2022 |
| Cosy Condos Ltd | Real estate | 2018 |