| Countrywide Tax & Trust Corporation Limited | Professional & scientific | 2003 |
| Courtenay House Management Limited | Households | 1997 |
| Courtyard Serviced Accommodation Ltd | Hospitality | 2017 |
| Coutts Care Solutions Ltd | Health & social care | 2025 |
| Coventry Advocacy Limited | Health & social care | 2019 |
| Coventry and Warwickshire Children's Charity | Other services | 2016 |
| Coventry Super Kings Cricket Club | Arts & recreation | 2020 |
| Covpress Limited | Manufacturing | 2017 |
| Cowdray Close Leamington Limited | Households | 2007 |
| CP Building Systems Ltd | Construction | 2004 |
| CPC Solutions Ltd | Construction | 2024 |
| CPG Facility Services Limited | Professional & scientific | 2013 |
| CPT Intrusive Ltd | Construction | 2025 |
| Cptraining Ltd | Education | 2026 |
| CR Build (Midlands) Ltd | Construction | 2024 |
| Crabb Curtis & Co (Commercial) Limited | Construction | 1990 |
| Cranesthorpe Court Management (Leamington) Limited | Households | 1971 |
| Craving Fried CHX Ltd | Hospitality | 2026 |
| Craving Kebabs Limited | Hospitality | 2022 |
| Creactive Design (Engineering) Limited | Professional & scientific | 2012 |
| Creactive Design (Transport) Limited | Professional & scientific | 2012 |
| Creactive Design Limited | Arts & recreation | 1989 |
| Creative Consulting Solutions Limited | Professional & scientific | 2007 |
| Creative in Nature Ltd | Education | 2023 |
| Creative Maintenance Services Ltd | Other services | 2020 |
| Creative PDB Ltd | Professional & scientific | 2024 |
| Creativejoe Limited | Professional & scientific | 2020 |
| Crees Design Consultancy Limited | Manufacturing | 2012 |
| Crescent Garage (Leamington) Limited | Wholesale & retail | 1964 |
| Crescent Industrial Ltd | Administrative & support | 2016 |
| Cresco Investors Limited | Real estate | 2016 |
| Crestiq Ltd | Wholesale & retail | 2026 |
| Crieff House Management Company Limited | Households | 1988 |
| Crimson Builders Ltd | Construction | 2017 |
| Crimson Contractors Ltd | Construction | 2023 |
| Crimson Investment Properties LLP | | 2005 |
| Cristianfcourier Ltd | Transport & logistics | 2023 |
| Croft Consulting Solutions Ltd | Professional & scientific | 2022 |
| Croft Property Ltd | Real estate | 2026 |
| Croisa Consulting Ltd | Professional & scientific | 2025 |
| Cromac Smith Limited | Transport & logistics | 1989 |
| Crowley Classics Ltd | Other services | 2017 |
| Crown & Coffee Limited | Hospitality | 2025 |
| Crown Aluminium Holdings Ltd | Manufacturing | 2015 |
| Crown Cultures Services Ltd | Professional & scientific | 2026 |
| Crownstall Ltd | Hospitality | 2008 |
| Crowton Ltd | Real estate | 2012 |
| Croxton House Management Company Limited | Real estate | 2023 |
| Crucian Water Orton Limited | Construction | 2016 |
| Cruck House Limited | Administrative & support | 2017 |
| Crustworthy Company Ltd | Hospitality | 2025 |
| CS Decorating & Landscaping Ltd | Construction | 2018 |
| CS Management Services Ltd | Professional & scientific | 2015 |
| CSC Engineering Limited | Information & communication | 2013 |
| CSC Forecourt Services Limited | Professional & scientific | 2004 |
| Cseosec Limited | Information & communication | 2023 |
| CT Playhouse Ltd | Hospitality | 2026 |
| Ctph Limited | Hospitality | 2026 |
| CTR Project Holdings Ltd | Real estate | 2025 |
| CTR Project Services Limited | Professional & scientific | 2018 |
| Ctrl ALT Insight Limited | Information & communication | 2025 |
| CTT Accountancy Ltd | Professional & scientific | 2020 |
| CTT Gables Limited | Real estate | 2019 |
| CTT Law Limited | Professional & scientific | 2018 |
| CTT Private Client Limited | Financial services | 2024 |
| CTT Succession Limited | Professional & scientific | 2022 |
| Cubbington and Lillington Environmental Action NOW CIC | Education | 2023 |
| Cubbington Garage Services Ltd | Wholesale & retail | 2021 |
| Cubbington Sawmills (Southam) Limited | Agriculture & fishing | 1965 |
| Cube Engineering Ltd | Construction | 2011 |
| Cullen Architectural Design Limited | Professional & scientific | 2014 |
| Culture Blender Ltd | Administrative & support | 2025 |
| Curiosity Catering Ltd | Hospitality | 2011 |
| Cursive Thought Ltd | Professional & scientific | 2025 |
| Curtin Climate Resilience Services Ltd | Professional & scientific | 2024 |
| Cusdin Holdings Limited | Professional & scientific | 2016 |
| Custom ENG. Limited | Professional & scientific | 2002 |
| Custom Fit Guards Hearing Limited | Manufacturing | 2017 |
| Cuvette Property Consulting Limited | Real estate | 2011 |
| CV31 Limited | Hospitality | 2015 |
| CV32 Management Ltd | Professional & scientific | 2016 |
| CV32 PUB Company Limited | Hospitality | 2023 |
| CV32 Public Houses Limited | Hospitality | 2025 |
| CV8 Limited | Administrative & support | 1999 |
| CV86 Limited | Other services | 2022 |
| Cwtch Communications Limited | Professional & scientific | 2024 |
| Cwwc Limited | Wholesale & retail | 2024 |
| Cyber-Biome Ltd | Information & communication | 2021 |
| Cybershield AI VPN Ltd | Information & communication | 2026 |
| Cycle Infinity Community Interest Company | Transport & logistics | 2023 |
| Cyclone Industries Limited | Information & communication | 2003 |
| D & C Associates Limited | Administrative & support | 2014 |
| D & D Goode Limited | Construction | 2013 |
| D & N Khera Properties Limited | Real estate | 2014 |
| D C Services & Co Limited | Administrative & support | 2011 |
| D Cafe Launch Ltd | Hospitality | 2025 |
| D M Bromwich Building Services Limited | Construction | 2015 |
| D N a Carcare Ltd | Wholesale & retail | 2011 |
| D O'Hare Limited | Manufacturing | 2011 |
| D S a (Management Services) Limited | Professional & scientific | 2002 |