| Cath Kidston Acquisitions Limited | Financial services | 2010 |
| Cath Kidston Group Limited | Wholesale & retail | 2010 |
| Cath Kidston Mezzco Limited | Financial services | 2010 |
| Cath Kidston Pfsco Limited | Financial services | 2010 |
| Catman Boogie Media Limited | Arts & recreation | 2015 |
| Catman Boogie Music & Entertainments Ltd. | Information & communication | 2013 |
| Causer Physiotherapy Ltd | Other services | 2015 |
| Cawdor House Limited | Households | 2025 |
| Caymans Limited | Administrative & support | 2004 |
| Cayres Cleaning Limited | Other services | 1993 |
| CB Enterprises Surveying Services Limited | Professional & scientific | 2007 |
| CB Marketing Consultancy Ltd | Professional & scientific | 2014 |
| Cb-Byceliak Ltd | Other services | 2025 |
| Cbern Solutions Limited | Health & social care | 2024 |
| CBN Furniture Ltd | Manufacturing | 2024 |
| CC Aqua Blasting Ltd | Manufacturing | 2009 |
| CC15 Ltd | Arts & recreation | 2014 |
| CCB Roofing Ltd | Construction | 2019 |
| CCL Woodworkers Limited | Construction | 2003 |
| CDB Construction Property Services Ltd | Construction | 2025 |
| CDC Property (London) Limited | Real estate | 2017 |
| CDG Team Ltd | Transport & logistics | 2025 |
| CDP Software Integrations Ltd | Information & communication | 2025 |
| CE Diagnostics Ltd. | Administrative & support | 2018 |
| CEB Consulting Limited | Professional & scientific | 2023 |
| Cecilia Sabauk Ltd | Administrative & support | 2025 |
| Cedacrest Limited | Real estate | 2011 |
| Cedar Green Healthcare Services Limited | Health & social care | 2024 |
| Cedar Tree Care Limited | Agriculture & fishing | 2013 |
| Cedars South Properties Ltd | Real estate | 2024 |
| Ceiba Ltd | Households | 2025 |
| Celdraft Limited | Professional & scientific | 2019 |
| Celebrant Services by JRC Ltd | Administrative & support | 2020 |
| Celestia Foods Ltd | Hospitality | 2025 |
| Cengo Logistic Ltd | Transport & logistics | 2026 |
| Censornet Limited | Information & communication | 2005 |
| Centauri Consulting Limited | Professional & scientific | 2016 |
| Central Anatolian Resources Limited | Mining & quarrying | 2017 |
| Central Clearance Logistics Ltd | Transport & logistics | 2019 |
| Central Employment Services Ltd | Administrative & support | 2021 |
| Central Point Media Ltd | Information & communication | 2025 |
| Central School of Dance & Drama Limited | Education | 2002 |
| Centre Court Leisure Management Limited | Education | 2010 |
| Centre Point Recruitment Ltd. | Administrative & support | 2023 |
| Centreserve Limited | Construction | 2024 |
| Centrestore Limited | Wholesale & retail | 2025 |
| Centric Media Ltd | Professional & scientific | 2016 |
| Centric SPV 1 Ltd. | Financial services | 2007 |
| Cerebral Palsy England Ltd | Health & social care | 2024 |
| Ceres Advisers Ltd | Professional & scientific | 2019 |
| Certified Courier Logistics Ltd | Transport & logistics | 2025 |
| CES Estates Limited | Real estate | 2007 |
| CES Freehold Estates LLP | | 2011 |
| CEX HQ Ltd | Financial services | 2020 |
| CF13 Limited | Arts & recreation | 2014 |
| CGC Investments Ltd. | Real estate | 2013 |
| Cgetl Ltd | Information & communication | 2026 |
| CH Halsbury Limited | Administrative & support | 2018 |
| Chabear Developments Ltd | Real estate | 2018 |
| Chabear Holdings Ltd | Real estate | 2021 |
| Chabear Investments Ltd | Construction | 2021 |
| Chalcedony Limited | Transport & logistics | 2003 |
| Chalet M Limited | Financial services | 2014 |
| Chalet M Services Limited | Administrative & support | 2019 |
| Chalk Media Limited | Professional & scientific | 2013 |
| Chan Denta Ltd | Health & social care | 2021 |
| Chandelier Cleaning & Restoration Services Limited | Manufacturing | 1980 |
| Chantry Build Ltd | Construction | 2016 |
| Chantry Construction Ltd | Construction | 2025 |
| Chapel Street Surgery Limited | Health & social care | 2012 |
| Chapter Fifty Ltd | Wholesale & retail | 2023 |
| Charcoal Meze Limited | Hospitality | 2023 |
| Charfleet Powder Coatings Holding Ltd | Real estate | 2020 |
| Chariot Clean FM Ltd | Administrative & support | 2020 |
| Charles DE Alwis Corporate Services Limited | Professional & scientific | 1999 |
| Charles Lock Limited | Real estate | 2017 |
| Charlie Simpson Consulting Ltd | Professional & scientific | 2016 |
| Charm RTM Company Limited | Extraterritorial | 2023 |
| Chartermore Partners Ltd | Administrative & support | 2022 |
| Chase Racing 4 Limited | Professional & scientific | 1994 |
| Chatham Maritime Sector 15 Resident Management Company Limited | Households | 2021 |
| Cheale Employee Services LLP | | 2011 |
| Cheale Group Limited | Professional & scientific | 2004 |
| Cheale Meats Limited | Wholesale & retail | 1980 |
| Cheam Properties Limited | Real estate | 2017 |
| Check Safety First Limited | Professional & scientific | 2003 |
| Checkmywheels Limited | Manufacturing | 2011 |
| Checkpoint Solutions Ltd | Administrative & support | 2015 |
| Cheeks Industrial Cleaning Services Limited | Administrative & support | 2009 |
| Cheikh Ndiaye Ltd | Transport & logistics | 2015 |
| Chellix Limited | Construction | 2008 |
| Chelmsford City Cars Limited | Administrative & support | 2019 |
| Chelmsford Night Limited | Hospitality | 2023 |
| Chelsfield Asia Holdings Ltd | Financial services | 2016 |
| Chelsfield Italia Limited | Real estate | 2017 |
| Chelsfield Paris Limited | Real estate | 2018 |
| Chem-Guard Ltd | Professional & scientific | 2012 |
| Cherry Pick Gaming Ltd | Other services | 2023 |
| Cherry Pick Limited | Manufacturing | 2019 |
| Cherry Pick Talent Holdings Ltd | Financial services | 2020 |