| Cole Digital Services Ltd | Professional & scientific | 2023 |
| Colehill Engineering Ltd | Professional & scientific | 2024 |
| Colepike Consultancy Ltd | Professional & scientific | 2025 |
| Coleshill Accident Repair Centre Ltd | Wholesale & retail | 2024 |
| Coleshill Windows & Doors Ltd | Manufacturing | 2014 |
| Colin Consultants Ltd | Information & communication | 2026 |
| Collaborative Education Trust | Education | 2011 |
| Collate Systems Limited | Information & communication | 2014 |
| Collect & Drive Ltd | Transport & logistics | 2019 |
| Collect My Rent Limited | Real estate | 2016 |
| Collective (Coleshill Street) Ltd | Construction | 2023 |
| Collective Development Group Ltd | Real estate | 2023 |
| Collett Transport Services Limited | Professional & scientific | 2013 |
| Collin & Hobson Limited | Wholesale & retail | 1983 |
| Collin (Holdings) Limited | Professional & scientific | 2006 |
| Collins Holdings Ltd | Financial services | 2021 |
| Colmar Properties Ltd. | Wholesale & retail | 1989 |
| Colmor Construction Ltd | Construction | 2021 |
| Colmor Holdings Ltd | Financial services | 2022 |
| Colmore Exchange Ltd | Wholesale & retail | 2026 |
| Colmore Tang Construction Limited | Construction | 2013 |
| Colmore Tang Projects Limited | Construction | 2020 |
| Colonial Finance (UK) Limited | Financial services | 1986 |
| Colordrives Limited | Professional & scientific | 1984 |
| Colourful Baby World Ltd | Wholesale & retail | 2016 |
| Colourwheel Solihull Ltd | Education | 2019 |
| Coltham Property Ltd | Real estate | 2019 |
| Columbo Construction Ltd | Construction | 2013 |
| Colwall Capital Investments Limited | Construction | 2023 |
| Combat Sports Retail Ltd | Wholesale & retail | 2006 |
| Comerford Construction Company Limited | Construction | 2005 |
| Comfort AC Ltd | Construction | 2023 |
| Comfort Community Services CIC | Hospitality | 2019 |
| Commercial Energy Switch Limited | Energy | 2024 |
| Commercial Green Maintenance Ltd | Agriculture & fishing | 2025 |
| Commercial Manager Ltd | Professional & scientific | 2021 |
| Commercial Property Consultants Limited | Construction | 2018 |
| Commercialised Investments Limited | Real estate | 2015 |
| Commonwealth Freight Limited | Administrative & support | 1995 |
| Commtech Solutions Ltd | Information & communication | 2020 |
| Communication & Technologies Ltd | Information & communication | 2016 |
| Community Essentials CIC | Health & social care | 2020 |
| Companions Pet Cremation Services Ltd | Other services | 2020 |
| Company Developments (Finance) Limited | Real estate | 1965 |
| Company for Electronic Industrial Automation (Ceia) Limited | Wholesale & retail | 2013 |
| Compcore Ltd | Information & communication | 2026 |
| Compensation 4 U Limited | Financial services | 2025 |
| Competition Bros Ltd | Arts & recreation | 2020 |
| Complete Accounting (UK) Ltd | Professional & scientific | 2012 |
| Complete Backoffice Solutions Ltd | Professional & scientific | 2015 |
| Complete Cloud Services Ltd | Wholesale & retail | 2018 |
| Complete Sports Group Ltd | Arts & recreation | 2022 |
| COMPLIANCE365 by ZAM Ltd | Information & communication | 2026 |
| Compton-Associates Ltd | Manufacturing | 2007 |
| Computaccount (UK) Limited | Information & communication | 1983 |
| Computer Tech-Experts Limited | Information & communication | 2004 |
| Conaught Plant Hire Limited | Administrative & support | 1996 |
| Concas Limited | Construction | 2005 |
| Concept Information Technology Limited | Administrative & support | 2025 |
| Conclude Properties Limited | Professional & scientific | 2023 |
| Concours Motor Company (1962) Limited | Wholesale & retail | 2007 |
| Concrete Creps Ltd | Wholesale & retail | 2025 |
| Concrete Developments (Readymix) Ltd | Financial services | 2016 |
| Concrete Developments Limited | Wholesale & retail | 1950 |
| Conduce Consulting Limited | Information & communication | 2009 |
| Conduce Group Limited | Information & communication | 2009 |
| Conduce I.T. Services Limited | Information & communication | 2009 |
| Conduce Ltd | Information & communication | 2003 |
| Conduce Software Limited | Information & communication | 2010 |
| Confiar Limited | Professional & scientific | 2012 |
| Confidence Group Limited | Professional & scientific | 2015 |
| Configit Ltd | Information & communication | 2011 |
| Conflow Power Group Ltd | Professional & scientific | 2020 |
| Congleton Garden Machinery Limited | Wholesale & retail | 1990 |
| Conifera Holdings Ltd | Agriculture & fishing | 2011 |
| Conley Utilities Limited | Construction | 2009 |
| Connaught Redevelopments Ltd | Real estate | 2026 |
| Connect 2 Families Ltd | Other services | 2017 |
| Connect 2 Finance Limited | Financial services | 2016 |
| Connect Case Management Limited | Health & social care | 2019 |
| Connect to Finance Limited | Financial services | 2016 |
| Connexos (Holdings) Limited | Other services | 2024 |
| Connexos Agency Limited | Professional & scientific | 2022 |
| Connexos Digital Limited | Other services | 2023 |
| Connextion Plumbing & Heating Ltd | Construction | 2017 |
| Connolly Building Solutions Ltd | Construction | 2015 |
| Conor O'Sullivan Designs Limited | Manufacturing | 2023 |
| Conservative Friends of Cyprus Limited | Administrative & support | 2022 |
| Conservatories R US Limited | Other services | 1999 |
| Consilience Consultancy Limited | Information & communication | 2024 |
| Construct Technology Ltd | Information & communication | 2015 |
| Constructing More Limited | Administrative & support | 2012 |
| Construction D H Limited | Construction | 2019 |
| Consult HD Ltd | Professional & scientific | 2017 |
| Consult Legal Recruitment Ltd | Administrative & support | 2016 |
| Contact Wave Limited | Information & communication | 2014 |
| Contactasia Ltd | Professional & scientific | 2012 |
| Contained Chaos Ltd | Professional & scientific | 2022 |
| Contempo Financial Services Ltd | Financial services | 2007 |
| Contemporary Cribs Limited | Construction | 2012 |