| Christopher Rushton Developments Ltd | Real estate | 2021 |
| Chrypckd Group Ltd | Wholesale & retail | 2023 |
| Chuchuff Ltd | Wholesale & retail | 2025 |
| Chung's Capital Ltd | Real estate | 2022 |
| Church Hill Place Management Company Limited | Households | 2018 |
| Church Walk (Chasetown) Management Limited | Households | 2007 |
| Churchfields Property Consortium Ltd | Real estate | 2017 |
| Churchley Bros.Limited | Extraterritorial | 1961 |
| Churchley Builders Plastics Limited | Extraterritorial | 1994 |
| Cianel Consulting Limited | Information & communication | 2013 |
| Cimac Martial Arts Wear Limited | Wholesale & retail | 1975 |
| Cimac Properties Limited | Construction | 2019 |
| Cimpli Limited | Information & communication | 2025 |
| Ciofran Global Limited | Wholesale & retail | 2026 |
| Citrus F.S. Limited | Other services | 2006 |
| City Centre Car Care Company Ltd. | Wholesale & retail | 1987 |
| City Centre Car Care Holdings Limited | Administrative & support | 2016 |
| City Centre Investments Limited | Real estate | 1971 |
| City Gardens (2026) Holdco Ltd | Real estate | 2026 |
| City Green Holdings Limited | Financial services | 2024 |
| City Green Investments Limited | Real estate | 2018 |
| City Link Transfers Ltd | Transport & logistics | 2019 |
| City Office Group Ltd | Professional & scientific | 2026 |
| City Price Limited | Manufacturing | 2020 |
| City UK Services Limited | Construction | 2007 |
| Citylink Estate Group Ltd | Real estate | 2020 |
| Citywave Systems Ltd | Extraterritorial | 2026 |
| Citywide Executive Travel Limited | Transport & logistics | 2018 |
| CJ Group Investments Ltd | Real estate | 2024 |
| CJ Lifestyle & Wellness Limited | Other services | 2021 |
| Cjcc Property Limited | Real estate | 2020 |
| Cjcl Investments Limited | Information & communication | 2017 |
| CJF Accounting Services Ltd | Professional & scientific | 2024 |
| Cjgb Retail (2) Ltd | Wholesale & retail | 2023 |
| Cjmr Management Ltd | Professional & scientific | 2024 |
| CK Building Supplies Ltd | Wholesale & retail | 2010 |
| CKC Consulting Services Limited | Information & communication | 2015 |
| CKG Estates Ltd | Real estate | 2023 |
| CKM Property Maintenance Limited | Construction | 2020 |
| Cladding London Limited | Construction | 2015 |
| Claim Resolution Services Ltd | Professional & scientific | 2024 |
| Claire Bartlett Ltd | Professional & scientific | 2021 |
| Claire Court Residents Association (Sheldon) Limited | Households | 1973 |
| Clairvaux Gardens Management Limited | Households | 2008 |
| Clamp Bros Events Hire Limited | Extraterritorial | 2018 |
| Clare GOW Services Limited | Professional & scientific | 2026 |
| Claremorris Consultancy Ltd | Extraterritorial | 2022 |
| Clarence Mansions Management Company Limited | Real estate | 2001 |
| Clarendon Court (Leamington Spa) Management Company Limited | Households | 2004 |
| Claret Advisory Ltd | Professional & scientific | 2026 |
| Claricks Limited | Real estate | 2025 |
| Clarion Education Limited | Education | 2024 |
| Claritize Ltd | Administrative & support | 2025 |
| Clarity Software Group Holdings Limited | Financial services | 2020 |
| Clarity Software Group Limited | Information & communication | 1989 |
| Clark Highway & Civil Services Ltd | Construction | 2025 |
| Clark Mulhern Construction Limited | Construction | 2011 |
| Clark Mulhern Holdings Limited | Financial services | 2024 |
| Clark Mulhern Plant Limited | Administrative & support | 2017 |
| Clark Properties (Birmingham) Limited | Real estate | 2018 |
| Clarke Associates (Midlands) Limited | Administrative & support | 2009 |
| Clarke Electrical & Property Services Ltd | Administrative & support | 2016 |
| Clarke Properties (Midlands) Limited | Real estate | 1964 |
| Clarkecm Limited | Professional & scientific | 2025 |
| Clarman Engineering Company Limited | Real estate | 1961 |
| Clash Design Ltd | Professional & scientific | 2005 |
| Clasp Ltd | Real estate | 2011 |
| Classic Cleaning Services (Birmingham) Ltd | Administrative & support | 2025 |
| Classic Construction Company (Birmingham) Ltd | Construction | 1986 |
| Classic Design & Build (Exhibitions) Limited | Construction | 2020 |
| Classic Replay Limited | Information & communication | 2024 |
| Classic Toys Limited | Wholesale & retail | 2009 |
| Classic Zone Limited | Wholesale & retail | 2022 |
| Claverham Group Limited | Manufacturing | 1997 |
| Claverham Limited | Manufacturing | 1997 |
| Clawtech Ltd | Other services | 2003 |
| Clay & Wright Limited | Real estate | 2023 |
| Clay Hair Studio Ltd | Other services | 2022 |
| Clay Homes Limited | Real estate | 2013 |
| Clay Housing Ltd | Health & social care | 2008 |
| Clay Medical & Therapy Services Limited | Health & social care | 2012 |
| Claybrook Business Park Limited | Financial services | 2026 |
| Claybrook Developments Ltd | Construction | 2022 |
| Claybrooke Limited | Real estate | 1964 |
| CLB Creative and Consultancy Ltd | Education | 2023 |
| CLC Management Solutions Limited | Administrative & support | 2013 |
| Clean Genie West Midlands Limited | Administrative & support | 2015 |
| Clean to Completion Ltd | Administrative & support | 2021 |
| Clean UP Water Ltd | Professional & scientific | 2022 |
| Cleanaxis Ltd | Administrative & support | 2026 |
| Cleaner Homes Solihull (Domestic) Limited | Administrative & support | 2019 |
| Cleaner Systems Ltd | Administrative & support | 2004 |
| Clearance Cosmetics Limited | Wholesale & retail | 2024 |
| Clearbrook Financial Solutions Ltd | Financial services | 2012 |
| Clearbrook Homes Ltd | Real estate | 2023 |
| Cleardale Limited | Professional & scientific | 1996 |
| Clearpath Operational Excellence Consultancy Ltd | Professional & scientific | 2025 |
| Clearspace Counselling Ltd | Health & social care | 2026 |
| Clearview 3D Ltd | Professional & scientific | 2020 |
| Clearview Outdoor Cleaning Limited | Administrative & support | 2025 |