| CHW Doors Ltd | Professional & scientific | 2012 |
| Cicily Ltd | Wholesale & retail | 2016 |
| CID Expert Limited | Transport & logistics | 2023 |
| Cilla Hospitality Ltd | Hospitality | 2025 |
| Ciptransport Ltd | Transport & logistics | 2025 |
| Circyl Limited | Information & communication | 2017 |
| Ciro Citterio Menswear Ltd | Wholesale & retail | 2011 |
| Cirqu Properties Limited | Real estate | 2023 |
| Cirquit Limited | Wholesale & retail | 2012 |
| Citraman Inns Ltd | Hospitality | 2016 |
| CJ Cabs Ltd | Administrative & support | 2016 |
| CJB Martin Investments Limited | Real estate | 2026 |
| CJH Fire Door Inspections & Remedials Limited | Manufacturing | 2026 |
| Cjrcomposites Ltd | Manufacturing | 2022 |
| Ckmz Consultancy Ltd | Professional & scientific | 2016 |
| Clara Transport Ltd | Transport & logistics | 2025 |
| Clarence Plates Ltd | Administrative & support | 2011 |
| Claritas Audio Visual Limited | Extraterritorial | 2015 |
| Clarity Commercial Finance Limited | Financial services | 2023 |
| Clarity HR Studio Ltd | Administrative & support | 2026 |
| Clarke Lane Engineering Limited | Manufacturing | 1996 |
| Clarkes Bulk Transport Ltd | Transport & logistics | 2016 |
| Clarks TM Ltd | Construction | 2025 |
| Clarkscape Solutions Ltd | Administrative & support | 2026 |
| Class Mate Education Limited | Administrative & support | 2025 |
| Classic Silicone Hoses Ltd | Other services | 2013 |
| Claymore Health & Fitness Ltd | Arts & recreation | 2018 |
| Clayton Transport Limited | Transport & logistics | 2011 |
| CLB Agency Ltd | Wholesale & retail | 2020 |
| Clean Machine Services (Midlands) Limited | Administrative & support | 2013 |
| Clean Water Services Ltd | Water & waste | 2015 |
| Clear Brew Birmingham Ltd | Administrative & support | 2019 |
| Clear Care Mobile Ltd | Health & social care | 2026 |
| Clear Electrical Solutions Limited | Construction | 2023 |
| Clear Nutrition Ltd | Health & social care | 2023 |
| Clearbrew Central Ltd | Other services | 2018 |
| Clearflow Legionella Solutions Ltd | Construction | 2018 |
| Clearly Drainworks Ltd | Water & waste | 2013 |
| Clearsmile Aligners Limited | Extraterritorial | 2013 |
| Clearsmile Braces Limited | Health & social care | 2013 |
| Cleo Marketing Limited | Administrative & support | 2008 |
| Cleotech Marketing Services Ltd | Professional & scientific | 2023 |
| CLH Services Ltd | Administrative & support | 2018 |
| Clickpower Ltd | Professional & scientific | 2022 |
| Clifford Legal Ltd | Professional & scientific | 2026 |
| Climaterite Limited | Manufacturing | 2017 |
| Clinical Framework Limited | Health & social care | 2008 |
| Clinicons Solutions Limited | Professional & scientific | 2024 |
| Clinistaff Ltd | Health & social care | 2015 |
| Clive Toon Developments Ltd | Construction | 2019 |
| Clive Toon Joinery Ltd | Manufacturing | 2013 |
| Closed System Control Association Ltd | Other services | 2016 |
| Cloud Accounting Academy Ltd | Extraterritorial | 2022 |
| Cloud Accounting Support Services Ltd | Professional & scientific | 2017 |
| Cloud Tech One Limited | Information & communication | 2025 |
| Cloud-Safe Limited | Information & communication | 2025 |
| Cloudnak Limited | Information & communication | 2015 |
| Clover Blue Ltd | Manufacturing | 2026 |
| Clover Developers Ltd | Administrative & support | 2018 |
| Clovers Freelancing Ltd | Information & communication | 2025 |
| Club Connective Ltd | Administrative & support | 2024 |
| CMB Smile Design Limited | Administrative & support | 2024 |
| Cmce Holdings Limited | Financial services | 2022 |
| CML Manufacturing Ltd | Manufacturing | 2024 |
| CMO Services Ltd | Manufacturing | 2008 |
| CMP Property Investments Limited | Real estate | 2019 |
| CMR Property Rentals Ltd | Real estate | 2019 |
| CMS Fabrications Ltd | Manufacturing | 2007 |
| CNC LAB Ltd | Manufacturing | 2020 |
| CNR Electrical Ltd | Construction | 2024 |
| CNS Home Construction Limited | Construction | 2021 |
| CNS Property Development Limited | Construction | 2021 |
| Co Labs Digital Ltd | Information & communication | 2025 |
| Coach Caelum Limited | Health & social care | 2025 |
| Coach Door Systems Ltd | Manufacturing | 2018 |
| Cobra Construction Services Limited | Construction | 2022 |
| Coco and MOO Ltd | Manufacturing | 2021 |
| Coconut Cafes Ltd | Wholesale & retail | 2025 |
| Coconut Pubs Ltd | Hospitality | 2023 |
| Coconut Wellness Studios Ltd | Arts & recreation | 2023 |
| Cogent Proposals Ltd | Professional & scientific | 2024 |
| Colclough Haulage Ltd | Transport & logistics | 2016 |
| Coldcare Ltd | Manufacturing | 2024 |
| Cole Company Capital Limited | Other services | 2024 |
| Coleman’S Legal Services Limited | Administrative & support | 2023 |
| Coler Supply Ltd | Extraterritorial | 2020 |
| Coleshill Town Football Club Limited | Arts & recreation | 2006 |
| Coley Wholesale Ltd | Wholesale & retail | 2024 |
| Colleen Mills Limited | Hospitality | 2011 |
| Colmore Tailors Ltd | Wholesale & retail | 2015 |
| Coltronics Systems Limited | Manufacturing | 1986 |
| COMBESGATE1 Ltd. | Information & communication | 2004 |
| Commercial Facade Installations Ltd | Construction | 2026 |
| Commercial Hardware Limited | Wholesale & retail | 2014 |
| Commissionability Ltd | Construction | 2013 |
| COMMITTED2CARE Ltd | Public administration | 2017 |
| COMMITTED2CLEAN Ltd | Administrative & support | 2021 |
| COMMITTED2CLEAN-COMMERCIAL Ltd | Administrative & support | 2025 |
| Communication for Business Limited | Information & communication | 2012 |
| Community Academies Trust | Education | 2010 |