| Community Ballers CIC | Arts & recreation | 2026 |
| Community Help Offering Individuals Counselling and Equine Services Community Interest Company | Health & social care | 2006 |
| Community Ride Project CIC | Education | 2026 |
| Community Together C.I.C. | Other services | 2011 |
| Compass Consortium Ltd | Real estate | 2018 |
| Complete Building Shopfitting Solutions Ltd | Construction | 2018 |
| Complete Office Products Ltd. | Administrative & support | 2011 |
| Complex Care Solutions Limited | Administrative & support | 2009 |
| Computer Solutions Tamworth Limited | Wholesale & retail | 2012 |
| Computergem Limited | Information & communication | 2014 |
| Concierge London Limited | Professional & scientific | 2017 |
| Concise Construction Testing Ltd | Professional & scientific | 2022 |
| Confederation of Professional Golf Limited | Arts & recreation | 1992 |
| Conformzeit Ltd | Professional & scientific | 2022 |
| Connect Fire Security Limited | Administrative & support | 2021 |
| Connect Mortgages & Protection Ltd | Financial services | 2020 |
| Connected Pathways CIC | Education | 2026 |
| Connemara Close Ltd | Households | 2018 |
| Connexus Finance Limited | Financial services | 2025 |
| Conrads Garage Limited | Wholesale & retail | 2019 |
| Conscious Living Coaches Ltd | Other services | 2022 |
| Consort Business Services Limited | Financial services | 2005 |
| Consort Place Management Company Limited | Real estate | 2002 |
| Consort Property Developments Limited | Construction | 2017 |
| Construct Safe Tamworth Limited | Construction | 2021 |
| Construction Glass Fibre Manufacturers Association | Other services | 2011 |
| Construction Property Consultants Limited | Professional & scientific | 2022 |
| Construction Safety Advisory Services Limited | Construction | 1986 |
| Construction Site Testing Ltd | Professional & scientific | 2025 |
| Consult 4D Ltd | Information & communication | 2018 |
| Contagious Supplements Limited | Wholesale & retail | 2023 |
| Container Systems Limited | Manufacturing | 1986 |
| Controlled Environments Ltd | Health & social care | 2006 |
| Converter King Ltd | Manufacturing | 2015 |
| Cookson Group Limited | Financial services | 2025 |
| Cooksons Purified Cleaning Limited | Administrative & support | 2025 |
| Cool UN Ltd | Information & communication | 2003 |
| Cooler Water Distribution Ltd | Construction | 2002 |
| Cooling the Change Ltd | Other services | 2026 |
| Coopermark Ltd | Construction | 2021 |
| Coopers Property Company Limited | Construction | 2007 |
| Copes Lodge Ltd | Hospitality | 1996 |
| Coppice Side Engineering Ltd | Manufacturing | 2008 |
| Coppinshill Limited | Agriculture & fishing | 2025 |
| Copsey Homes Ltd | Real estate | 2023 |
| Cora Communications Ltd | Information & communication | 2022 |
| Coral Products (Mouldings) Ltd | Extraterritorial | 2012 |
| Core Integrity Clinics Ltd | Health & social care | 2022 |
| Core Marketing & Events Limited | Professional & scientific | 2002 |
| CORE300 Limited | Arts & recreation | 2019 |
| CORE4CLINIC (Verwood) Limited | Health & social care | 2018 |
| Corestrat Ltd | Real estate | 2021 |
| Cornerstone Joint Ventures Holdings Limited | Financial services | 2024 |
| Cornerstone Partnership Developments Limited | Construction | 2020 |
| Cornerstone Partnership Group Limited | Financial services | 2023 |
| Cornerstone Partnership Limited | Real estate | 2016 |
| Cornerstone Partnership Management Limited | Real estate | 2024 |
| Cornerstone Restoration Limited | Administrative & support | 2020 |
| Cornerstone Software Ltd | Information & communication | 2016 |
| Cornerstorecreative Ltd | Professional & scientific | 2025 |
| Corporate Connection Workwear & Business Clothing Limited | Manufacturing | 2002 |
| Corporate Letting HQ Ltd | Real estate | 2025 |
| Corrico Limited | Construction | 1982 |
| Corrigan Fire and Security Limited | Construction | 2019 |
| Corun Limited | Professional & scientific | 2007 |
| COS94 Trans Limited | Transport & logistics | 2026 |
| Cosmedic Online Limited | Wholesale & retail | 2015 |
| Cosmedic Skin Clinic Limited | Health & social care | 2005 |
| Cosmedic Training Academy Ltd. | Education | 2015 |
| Cosmos Dental Limited | Information & communication | 2020 |
| Costa Consultant Ltd Ltd | Households | 2025 |
| Cosy Corner Crew Ltd | Arts & recreation | 2025 |
| Cosy Stays Serviced Apartments Limited | Hospitality | 2026 |
| Coton Engineering Ltd | Professional & scientific | 2014 |
| Cotswold Confectionery Ltd | Manufacturing | 2016 |
| Country Leisure Sport Ltd | Wholesale & retail | 2017 |
| Countrywide Cottages Limited | Hospitality | 2015 |
| County Driveways (UK) Limited | Construction | 2006 |
| Cousins Pizza House Ltd | Hospitality | 2019 |
| Coventry Technology Services Ltd | Information & communication | 2016 |
| Cowboy Classics Ltd | Wholesale & retail | 2025 |
| Cowley Homegroup Ltd | Real estate | 2024 |
| CPE Pressure Vessels Limited | Manufacturing | 1948 |
| CPF Electrical Ltd | Construction | 2021 |
| CPG Digital Services Limited | Other services | 2020 |
| CPG International Ventures Limited | Other services | 2020 |
| CPG Knowledge and Development Services Limited | Other services | 2020 |
| CPI (Tamworth) Ltd | Construction | 2013 |
| CPS Renewable Energy Solutions Ltd | Administrative & support | 2018 |
| CR Deliveries Ltd | Transport & logistics | 2025 |
| CR Financial Advice Ltd | Financial services | 2020 |
| CRA Construction Services (UK) Limited | Construction | 2021 |
| Crafternoon Tea Tamworth Ltd | Hospitality | 2024 |
| Crawford Summers Property Limited | Real estate | 2026 |
| Creative Choices CIC | Health & social care | 2015 |
| Creative Garden Rooms Limited | Construction | 2018 |
| Creative Laser Engraving Ltd | Manufacturing | 2013 |
| Creative Legacy Ltd | Wholesale & retail | 2020 |
| Creative Living Holding Ltd | Financial services | 2024 |
| Creative Living Property Ltd | Real estate | 2023 |