| Churchill Taxation Ltd | Professional & scientific | 2014 |
| Churchway Fairview Limited | Real estate | 2026 |
| Chyduzion Ltd | Transport & logistics | 2023 |
| Chykrovoire Ltd | Transport & logistics | 2023 |
| Chykrozith Ltd | Transport & logistics | 2023 |
| Chyminior Ltd | Transport & logistics | 2023 |
| Chymvidzy Ltd | Transport & logistics | 2023 |
| CIG (UK) Holdings and Investments Ltd | Financial services | 2024 |
| CIG (UK) Legal & Investments Ltd | Financial services | 2025 |
| Cine- Scene Creations Limited | Construction | 2025 |
| City College Birmingham | Education | 2017 |
| City Fish Limited | Hospitality | 2024 |
| City Frying Limited | Hospitality | 2024 |
| CJ Holland Contracting Limited | Extraterritorial | 2006 |
| Cjam AM Limited | Health & social care | 2018 |
| CJB Holdings & Investments Ltd | Financial services | 2024 |
| CJB System Designs Limited | Professional & scientific | 2016 |
| CJM Sports Limited | Arts & recreation | 2017 |
| CJP Developments Limited | Real estate | 2018 |
| CJP Homes Ltd | Construction | 2017 |
| CJP Property & Lettings Limited | Real estate | 2019 |
| CJP Property Investments Sedgley Ltd | Construction | 2019 |
| CJT Construction and Developments Ltd | Construction | 2023 |
| CJW Cottages Ltd | Hospitality | 2024 |
| Ckca Limited | Professional & scientific | 2020 |
| CKZ Autos Ltd | Wholesale & retail | 2025 |
| Clare Mathews (NO I One T) Limited | Professional & scientific | 2017 |
| Clarence Road Dentures Ltd | Health & social care | 2025 |
| Clarke Property Investments Limited | Real estate | 2015 |
| Class Solutions Recruitment Ltd | Administrative & support | 2017 |
| Classic Car Parts Limited | Wholesale & retail | 2017 |
| Classic Car Signs Limited | Wholesale & retail | 2022 |
| Classic Curly Curly Limited | Other services | 2025 |
| Classic Enterprises (UK) Limited | Wholesale & retail | 2001 |
| Classic Weddings Limited | Wholesale & retail | 2008 |
| CLAWS2PAWS Pet Shop Ltd | Wholesale & retail | 2022 |
| CLB Lawyers Limited | Professional & scientific | 2016 |
| CLC Building Services Ltd | Construction | 2025 |
| Clean & Tidy Ironing Services Limited | Administrative & support | 2009 |
| Clean Image (UK) Limited | Administrative & support | 2004 |
| Clean Sweep (NH) Ltd | Administrative & support | 2019 |
| Cleaner Projects Limited | Financial services | 2018 |
| Cleansweepsolutionscss Ltd | Water & waste | 2024 |
| Clearstone West Motors Limited | Wholesale & retail | 2026 |
| Clearwater Engineering and Fabrication Limited | Administrative & support | 1998 |
| Clearway Services Limited | Hospitality | 2008 |
| Clee Hills Holdings Limited | Financial services | 2021 |
| Clee Pharma Limited | Administrative & support | 2013 |
| Clee View Estates LLP | | 2024 |
| Clee View Properties Limited | Construction | 2025 |
| Clements Grey Ltd. | Administrative & support | 2012 |
| Cleonex Solutions Ltd | Administrative & support | 2025 |
| Click IT Support Limited | Information & communication | 2023 |
| Clifford Decorating Solutions Limited | Construction | 2022 |
| Clifton Computer Systems Limited | Information & communication | 1985 |
| Clifton Street Management Company Ltd | Households | 2021 |
| Clinical Pharma Services Limited | Professional & scientific | 2025 |
| Clinically Clean Services Limited | Administrative & support | 2022 |
| Cliogrey Ltd | Other services | 2025 |
| Clipa's Construction Limited | Construction | 2025 |
| CLOUD2STACK Limited | Wholesale & retail | 2025 |
| Club 180 Ltd | Information & communication | 2026 |
| Club 22 Fragrances Limited | Wholesale & retail | 2017 |
| Clutton Holdings and Investments Ltd | Financial services | 2021 |
| CLW Surveyors Ltd | Professional & scientific | 2023 |
| CMA Freestyle Limited | Arts & recreation | 2024 |
| CMC IT Services Ltd | Information & communication | 2018 |
| Cmercuri Limited | Administrative & support | 2026 |
| CMG Inspection Ltd | Professional & scientific | 2017 |
| CMM Services Ltd | Professional & scientific | 2020 |
| CMS Tyres Ltd | Manufacturing | 2025 |
| Co-Lab Recordings Limited | Arts & recreation | 2003 |
| Coachedbychristian Ltd | Other services | 2020 |
| Cobden Street Bungalow Ltd | Administrative & support | 2018 |
| Cobra Cable Management Ltd | Wholesale & retail | 2015 |
| Cocktail Cosmetics Ltd | Wholesale & retail | 2010 |
| Cocos Music Bar Ltd | Hospitality | 2024 |
| Codar Studios Limited | Information & communication | 2014 |
| Codecamp Ltd | Education | 2018 |
| Codeconsult Limited | Administrative & support | 2017 |
| Coinhill Ltd | Wholesale & retail | 2018 |
| Coldwick Ltd | Administrative & support | 2018 |
| Cole & Saunders Limited | Financial services | 2005 |
| Collectarea Limited | Wholesale & retail | 2012 |
| Collinson & Grainger Holdings Limited | Extraterritorial | 2009 |
| Collinson & Grainger Limited | Construction | 1986 |
| Collinson & Grainger Property Services Limited | Real estate | 2013 |
| Colmic Construction Limited | Construction | 2005 |
| Colour Business Solutions Limited | Manufacturing | 2002 |
| Coltec Holdings and Investments Ltd | Financial services | 2019 |
| Colthrop Manor Limited | Hospitality | 2015 |
| Com.Net (Cabling) Limited | Manufacturing | 2000 |
| Comfort-Lodge Ltd | Real estate | 2023 |
| Comfort-Lodge Property Investments Ltd | Real estate | 2023 |
| Comfy Crew Limited | Hospitality | 2024 |
| Comfy Plus Limited | Professional & scientific | 2009 |
| Commercial Fire Services Ltd | Administrative & support | 2025 |
| Commercial Kitchen Catering Solutions Ltd | Manufacturing | 2025 |
| Commercial Property Care Limited | Construction | 2009 |
| Commercial Security Systems (UK) Limited | Administrative & support | 2008 |