| C C L Traditional English GUN Products Limited | Manufacturing | 1983 |
| C H Holdings and Investments Limited | Financial services | 2022 |
| C J Fire and Security Systems Ltd | Administrative & support | 2011 |
| C L R Construction Ltd | Construction | 2015 |
| C Perkins Machinery Limited | Wholesale & retail | 2017 |
| C R Macdonald Holdings Limited | Professional & scientific | 2018 |
| C R Macdonald Limited | Construction | 2002 |
| C R Macdonald Plant Hire Limited | Construction | 2014 |
| C W Corporate Communications Limited | Manufacturing | 1986 |
| C&H Showcase Ltd | Administrative & support | 2020 |
| C&M Group Holdings Limited | Financial services | 2020 |
| C&M James Ltd | Construction | 2026 |
| C&T Home and Garden Furnishings Ltd. | Wholesale & retail | 2022 |
| C-Fresh Limited | Extraterritorial | 2020 |
| C. Clark & SON Limited | Construction | 2025 |
| C. J. S. Building Services Limited | Construction | 2007 |
| C.A.N Electrical Services Limited | Construction | 2018 |
| C.A.R.M.S. Conflict Aggression & Resistance Management Services Limited | Professional & scientific | 2005 |
| C.A.T. Flooring Partnerships Limited | Construction | 2025 |
| C.B.T. Group Limited | Administrative & support | 2007 |
| C.D.D. Cable Specialists Limited | Manufacturing | 2013 |
| C.M.C Deals Ltd | Construction | 2022 |
| C.Quirk Limited | Wholesale & retail | 2023 |
| C.R.B. Electrical Limited | Construction | 2002 |
| C21 Solutions Limited | Information & communication | 2008 |
| Cabcal Services Limited | Extraterritorial | 2002 |
| Cadam Engineering Limited | Manufacturing | 2017 |
| Cadam Machinery Limited | Manufacturing | 2017 |
| Cadantis Associates Ltd | Professional & scientific | 2003 |
| Cadantis Forensics Limited | Extraterritorial | 2017 |
| Cadantis Ltd | Professional & scientific | 2008 |
| Caden Ltd | Extraterritorial | 2010 |
| Cadinside Ltd | Information & communication | 1999 |
| Cafe Cannoli Limited | Hospitality | 2018 |
| Cafequote Limited | Construction | 1995 |
| CAI Hong Spa Ltd | Health & social care | 2025 |
| Cake Mechanic Ltd | Manufacturing | 2018 |
| Calderhead Holding Limited | Financial services | 2025 |
| Calderhead Refrigerated Transport Limited | Transport & logistics | 2003 |
| Caledonian Control Technology Limited | Manufacturing | 1987 |
| Caledonian Controls Limited | Professional & scientific | 1999 |
| Calenta Ltd | Professional & scientific | 2023 |
| Calibre Electrical Limited | Construction | 2019 |
| Calibre Performance Coaching Ltd | Education | 2019 |
| Calincamiloristrans Ltd | Transport & logistics | 2024 |
| Calken Bronze Ltd | Administrative & support | 2010 |
| Calken Services Limited | Professional & scientific | 2019 |
| Callow Hill Village Limited | Real estate | 1984 |
| Callow Park Residents Association Limited | Administrative & support | 1978 |
| Calmify Ltd | Professional & scientific | 2021 |
| CAM Construction (Midlands) Limited | Construction | 2004 |
| Cameron Chance Ltd | Real estate | 2009 |
| Cameron James Consulting Limited | Education | 2023 |
| Campbell Construction (Midlands) Limited | Real estate | 2017 |
| Campbell Pitt & Co Ltd | Professional & scientific | 2018 |
| Canavape Ltd | Manufacturing | 2024 |
| Candy Head Management Ltd | Administrative & support | 2007 |
| Cannins Ltd | Administrative & support | 2015 |
| Canny Partners Limited | Professional & scientific | 2018 |
| Capax Developments Limited | Construction | 2023 |
| Capital CAB Company Limited | Administrative & support | 2021 |
| Capstone Refurbishment Ltd | Construction | 2017 |
| Capt Group Limited | Financial services | 2024 |
| Captured by JJ Photography Ltd | Professional & scientific | 2025 |
| Car Clinic Redditch Ltd | Wholesale & retail | 2018 |
| Car Repairs Shop Limited | Wholesale & retail | 2018 |
| Caracas Holdings Limited | Professional & scientific | 2017 |
| Carers Careline | Health & social care | 2003 |
| Caribbean Flavour Restaurant and Bar Limited | Hospitality | 2025 |
| Carlton Blinds Limited | Manufacturing | 2002 |
| Carma Online Limited | Wholesale & retail | 2014 |
| Carms Ltd | Professional & scientific | 2023 |
| Caroline Dixon Services Limited | Professional & scientific | 2012 |
| Carp Particles UK Ltd | Wholesale & retail | 2021 |
| Carpenter Landscapes Limited | Construction | 2005 |
| Carpenters Hill Dairy Limited | Agriculture & fishing | 2007 |
| Carpet & Flooring (Trading) Limited | Extraterritorial | 2022 |
| Carpetworld Manchester Limited | Extraterritorial | 2002 |
| Carrot Property Investments Limited | Real estate | 2022 |
| Carrs Coatings Limited | Manufacturing | 2008 |
| Cars Vans and More Ltd | Wholesale & retail | 2019 |
| Cartel Incorporated Ltd | Hospitality | 2021 |
| Cartwheel Holdings Limited | Financial services | 2018 |
| Carve Creations Limited | Manufacturing | 2017 |
| Casa Improvements Limited | Construction | 2024 |
| Casa Shop Limited | Wholesale & retail | 2024 |
| Cascades Property Limited | Real estate | 2010 |
| Casey Counting Ltd | Administrative & support | 2018 |
| Casmarelle Ltd | Administrative & support | 2023 |
| Caspian Group Holdings Limited | Administrative & support | 2014 |
| Castolin Eutectic Limited | Wholesale & retail | 1948 |
| Catalin Transport Ltd | Transport & logistics | 2025 |
| Cater for Limited | Professional & scientific | 2010 |
| Catrina Trans Ltd | Transport & logistics | 2026 |
| Cattwell Limited | Construction | 2026 |
| Cava Security Services Limited | Administrative & support | 2005 |
| Cavalier Property Limited | Real estate | 2022 |
| CB & HC Limited | Wholesale & retail | 2023 |
| CB Bookkeeping Limited | Professional & scientific | 2019 |
| CB Campers Ltd | Other services | 2024 |