| C & J Investments Limited | Extraterritorial | 1997 |
| C W Accountancy Services (Frome) Limited | Professional & scientific | 2001 |
| C W Clare (SW) Limited | Wholesale & retail | 2005 |
| C&J Clark (NO 1) Limited | Other services | 1997 |
| C&J Clark Limited | Wholesale & retail | 1997 |
| C. & J. Clark (Holdings) Limited | Administrative & support | 1903 |
| C. & J. Clark (Services) Limited | Manufacturing | 1968 |
| C. & J. Clark (Street) Limited | Professional & scientific | 1992 |
| C. & J. Clark International Limited | Wholesale & retail | 1915 |
| C. & J. Clark Investment Properties Limited | Construction | 1955 |
| C. & J. Clark Main Pension Fund (Trustees) Limited | Professional & scientific | 1987 |
| C. & J. Clark Pension Funds (Trustee) Limited | Professional & scientific | 1984 |
| C. & J. Clark Retail Properties Limited | Construction | 1937 |
| C. & J. Clark Senior Executive Pension Scheme (Trustees) Limited | Professional & scientific | 1987 |
| C. & J. Clark Trustee Limited | Professional & scientific | 1995 |
| C.A. Heal & Sons (Amusements) Limited | Arts & recreation | 1995 |
| C.J. Clothier Transport Limited | Transport & logistics | 2002 |
| C.L.T.B Limited | Administrative & support | 2002 |
| C.R. Jones & Co. Limited | Professional & scientific | 1997 |
| C.W. Feltham Limited | Wholesale & retail | 2004 |
| Cadbury Business Park Limited | Real estate | 1995 |
| Cadbury Communications Limited | Professional & scientific | 2007 |
| Cadbury Kitchens Limited | Manufacturing | 2003 |
| Camp Kerala International Limited | Hospitality | 2020 |
| Campbell Young Associates Limited | Manufacturing | 2003 |
| Cando 4 YOU Services & Travelgoods Ltd | Wholesale & retail | 2003 |
| Cantref Riding Limited | Arts & recreation | 2007 |
| Card Line (West Country) Limited | Wholesale & retail | 2004 |
| Cardamom 49 Ltd | Hospitality | 2023 |
| Care Placement Solutions Ltd | Health & social care | 2024 |
| Carlton Mews Limited | Real estate | 1993 |
| Carter Technical Mouldings Limited | Manufacturing | 2007 |
| Carymoor Environmental Trust | Education | 1998 |
| Casmaran Ltd | Professional & scientific | 2005 |
| Cass & Sons Limited | Professional & scientific | 2007 |
| Castle Home Improvements Limited | Construction | 1988 |
| Castle Mill M.O.T. Centre Ltd | Wholesale & retail | 2006 |
| CB Yacht Brokerage Ltd | Administrative & support | 2025 |
| Celtbrook Limited | Real estate | 1984 |
| Central Motor Co (Bridgwater) Limited | Wholesale & retail | 1999 |
| Central Motors (Chard) Limited | Wholesale & retail | 1963 |
| Ceres Natural Foods Limited | Wholesale & retail | 2000 |
| Chalmers HB Limited | Professional & scientific | 2001 |
| Chant Building & Development Limited | Construction | 2006 |
| Chantry Fine Art Limited | Wholesale & retail | 2003 |
| Chantry Limited | | 1991 |
| Charlton Somerset Hospitality Limited | Real estate | 2022 |
| Charlton Somerset Properties Limited | Real estate | 2024 |
| Charterhouse Yard Management Company Ltd | Real estate | 2021 |
| Cheddar Fuel Station Ltd | Wholesale & retail | 2021 |
| Cheddar GIN Ltd | Manufacturing | 2021 |
| Cheddar Kebab Ltd | Hospitality | 2023 |
| Cheddar Mineral Water Limited | Manufacturing | 2004 |
| Cheddar Motors Limited | Wholesale & retail | 1974 |
| Cheddar Natural Mineral Water Limited | Manufacturing | 2005 |
| Cheddar Natural Spring Water Limited | Manufacturing | 2005 |
| Cheddar Spring Water Limited | Manufacturing | 2004 |
| CHF Herogliffix Limited | Information & communication | 2008 |
| CHF TV Limited | Information & communication | 2016 |
| Chloe Nails & Beauty 102 Ltd | Other services | 2024 |
| Cholwell House Nursing Home Limited | Other services | 2003 |
| Chopper(The) | | 1985 |
| Chris COX Digital Services Ltd | Manufacturing | 2023 |
| Christopher Carter Financial Services Limited | Financial services | 2008 |
| Christopher Claire Limited | Manufacturing | 2007 |
| CHT UK Bridgwater Ltd. | Manufacturing | 1974 |
| Church Street Dental Practice Limited | Health & social care | 2007 |
| Circlepride Limited | Transport & logistics | 1990 |
| CKD & SON Construction Limited | Construction | 2002 |
| Claire LEA Associates Limited | Professional & scientific | 2025 |
| Clare Group Ltd | Professional & scientific | 2018 |
| Clarence Court (Yeovil) Limited | Households | 2004 |
| Clares Refrigeration Limited | Professional & scientific | 1959 |
| Clarity Copiers (Western) Limited | Manufacturing | 1980 |
| Clarks Limited | Wholesale & retail | 1908 |
| Clarks Pension Trustee (2005) Limited | Financial services | 2004 |
| Clarks Properties Limited | Construction | 1960 |
| Clarkson and Woods Limited | Administrative & support | 2003 |
| Cleartenure Property Management Limited | Real estate | 1995 |
| Clement White Jewellers Ltd. | Wholesale & retail | 2003 |
| Cluff Commercial Limited | Real estate | 2005 |
| Coconut Animated Island Limited | Information & communication | 2017 |
| Codag SMT Limited | Water & waste | 1990 |
| Coiffure Ltd | Other services | 1988 |
| Colets Services Ltd | Administrative & support | 2003 |
| Colman Bros. Limited | Construction | 2007 |
| Colsar Limited | Real estate | 1999 |
| Concept Fabrications Cymru Ltd | Construction | 2024 |
| Concord International (Cymru) Limited | Administrative & support | 2000 |
| Connect Electrical Services Limited | Construction | 2001 |
| Consol Suncenter (Newport) Limited | Other services | 1999 |
| Controls and Automation (UK) Limited | Manufacturing | 2003 |
| Converting Designs Ltd | Manufacturing | 2003 |
| Coombes Manor Farm Limited | Agriculture & fishing | 2012 |
| Coombs Carpenters South West Ltd | Manufacturing | 1998 |
| Copernicus Limited | Information & communication | 1982 |
| Corky Pine Limited | Wholesale & retail | 2004 |
| Corner Garage Limited | Wholesale & retail | 2003 |
| Cornish Organic Aloe Vera Ltd | Manufacturing | 2007 |
| Cosy Bike Ltd | Manufacturing | 2012 |