| CAD Automotive Ltd | Administrative & support | 2014 |
| CAD Group Holdings Ltd | Financial services | 2026 |
| Cafe 148 Ltd | Hospitality | 2023 |
| Callen Plant Hire Ltd | Wholesale & retail | 2016 |
| Campbell Traffics Ltd | Construction | 2016 |
| Camtrad Homes Limited | Real estate | 2017 |
| Capalaba Sunset Holdings Ltd | Information & communication | 2017 |
| Capalex Holdings Limited | Professional & scientific | 2004 |
| Capital Aluminium Extrusions Limited | Manufacturing | 1996 |
| Cappers Newton Ltd | Manufacturing | 2019 |
| Car Panels 4 YOU Ltd | Wholesale & retail | 2024 |
| Car Van Repair Tyre Centre Ltd | Wholesale & retail | 2026 |
| Carbondyne Ltd | Wholesale & retail | 2023 |
| CARENOW247 Ltd | Health & social care | 2012 |
| Carirza Ltd | Wholesale & retail | 2026 |
| Carl Davies Ltd | Construction | 2017 |
| Carl Turners Carpentry Ltd | Construction | 2026 |
| Carlewis Group Ltd | Real estate | 2024 |
| Carmiya CEE Limited | Hospitality | 2021 |
| Carol's Fish & Chipp Shop Ltd | Wholesale & retail | 2020 |
| Carols Chippy Ltd | Hospitality | 2024 |
| Cars Market Limited | Wholesale & retail | 2022 |
| Casey Cranes Ltd | Construction | 2024 |
| Cashmores Metals Limited | Wholesale & retail | 1973 |
| Casiviogb Market Ltd | Wholesale & retail | 2026 |
| Caspian Pizza Wednesbury Ltd | Hospitality | 2026 |
| Castle Home Improvements (Midlands) Limited | Construction | 2007 |
| CB Williams Electrical Solutions Limited | Construction | 2014 |
| CCF India Ltd | Manufacturing | 2014 |
| Cedar Bookkeeping Ltd | Professional & scientific | 2023 |
| Celltex Holdings Limited | Financial services | 2015 |
| Celltex Limited | Wholesale & retail | 1991 |
| Cemen Tech Holdings Ltd | Administrative & support | 2019 |
| Cemen Tech UK Ltd | Administrative & support | 2020 |
| Central Arches UK Ltd | Construction | 2018 |
| Central Heatking Ltd | Construction | 2023 |
| Central Letting Solutions Ltd | Real estate | 2018 |
| Central Wholesaler Ltd | Wholesale & retail | 2019 |
| Centurionflow Ltd | Transport & logistics | 2025 |
| Cerobi Services Ltd | Administrative & support | 2026 |
| Chaii Bros Ltd | Hospitality | 2025 |
| Chambers Recovery Limited | Transport & logistics | 2020 |
| Chardikala Transport Limited | Transport & logistics | 2025 |
| Charles Howell (Lettings) Limited | Real estate | 2015 |
| Charm Entertainment Ltd | Information & communication | 2025 |
| Choice Cars (UK) Limited | Transport & logistics | 2013 |
| Chris Bateman Financial Services Limited | Financial services | 2013 |
| Church Hill Court Residents Association Limited | Households | 1997 |
| Cinset Studio Ltd | Information & communication | 2024 |
| Circlemount Dental Technology Ltd | Information & communication | 2026 |
| CIS Facilities Management Limited | Construction | 2014 |
| City Maintenance and Storage Limited | Construction | 2025 |
| Civil ENG Resource Ltd | Construction | 2025 |
| Civilec Contracts Ltd | Construction | 2024 |
| CJW Autos Ltd | Wholesale & retail | 2011 |
| CKB Tax Consulting Limited | Professional & scientific | 2021 |
| CLA Group Trading Ltd | Financial services | 2022 |
| CLA Holdings Direct Ltd | Real estate | 2021 |
| Claire Joyce ISW Ltd | Health & social care | 2019 |
| Clarence Road Service Station Ltd | Transport & logistics | 2010 |
| Classic Plumbing & Building (Midlands) Ltd | Construction | 2018 |
| Classic Plumbing & Heating (Midlands) Ltd | Construction | 2018 |
| Claudia Ravi Cleaning Ltd | Administrative & support | 2024 |
| Clayclo Europe Ltd | Wholesale & retail | 2025 |
| Cleannest Group UK Ltd | Administrative & support | 2025 |
| Clear View Glass Replacement Ltd | Construction | 2022 |
| Climbmax Scaffolding Ltd | Construction | 2023 |
| Club LOS Claveles Limited | Hospitality | 2015 |
| CMS Auto Ltd | Wholesale & retail | 2024 |
| CNC Tech Engineering Ltd | Manufacturing | 2014 |
| Cobalt Controls Limited | Manufacturing | 2003 |
| Cobham Aluminium & Stainless Holdings Limited | Wholesale & retail | 2011 |
| Cobo Healthcare Limited | Health & social care | 2025 |
| Cobo Living Ltd | Real estate | 2024 |
| Cobol Travels Limited | Education | 2025 |
| COD N Crown Fish Bar Ltd | Hospitality | 2026 |
| Codfather House Ltd | Hospitality | 2018 |
| Collins and Co UK Ltd | Transport & logistics | 2025 |
| Combat Heating Solutions Limited | Manufacturing | 2017 |
| Comfichic Ltd | Wholesale & retail | 2025 |
| Commercial Fleet Solutions Limited | Wholesale & retail | 2023 |
| Commercial Truck Repairs (Wolverhampton) Ltd | Wholesale & retail | 2001 |
| Community Red C.I.C. | Administrative & support | 2019 |
| Complete Electric Care Ltd | Construction | 2020 |
| Complete GAS Care Ltd | Construction | 2020 |
| Complete Home Care Ltd | Administrative & support | 2017 |
| Complex Cold Forming Limited | Manufacturing | 2008 |
| COMPO1987 Ltd | Hospitality | 2026 |
| Compressed Air & Refrigeration Services Limited | Manufacturing | 2010 |
| Comtab Limited | Professional & scientific | 2006 |
| Connect Recycler Ltd | Administrative & support | 2017 |
| Connect Rise CIC | Education | 2025 |
| Connect Vehicle Rentals Ltd | Administrative & support | 2021 |
| Connector Subsea Solutions (UK) Ltd | Manufacturing | 2017 |
| Conservation Building Renovation Limited | Extraterritorial | 2012 |
| Construction Design Management Services Limited | Professional & scientific | 1995 |
| Consulting at Number 14 Limited | Professional & scientific | 2024 |
| Contech Testing & Consultancy Ltd | Administrative & support | 2021 |
| Cool & Tech Services Ltd | Construction | 2026 |
| Coolmation Service Ltd | Manufacturing | 1997 |