| Chapelgrove Waste Management Limited | Water & waste | 2001 |
| Chapplins Estate Agents (Havant) Limited | Real estate | 2002 |
| Char (UK) Limited | Wholesale & retail | 2006 |
| Character Construction (Southern) Limited | Wholesale & retail | 2003 |
| Charles Winter (Portsmouth) Limited | Wholesale & retail | 1963 |
| Charlton Gate Property Co. Limited | Real estate | 1986 |
| Charlton's PMC Ltd | Construction | 2006 |
| Charter Cutting Company Limited | Other services | 2006 |
| Charters of Aldershot Limited | Wholesale & retail | 1959 |
| Cherrywood Management Company (Hedge END) Limited | Households | 1998 |
| CHG Sports Therapy Ltd | Other services | 2020 |
| Chic Teak Limited | Wholesale & retail | 2006 |
| Chidden Farms | | 1996 |
| CHP 3 SPV 1 Limited | Real estate | 2025 |
| CHP 3 SPV 2 Limited | Real estate | 2025 |
| Christopher Stephens Limited | Wholesale & retail | 2005 |
| Church Street Models Limited | Extraterritorial | 2007 |
| Church's Financial Planning Limited | Financial services | 1996 |
| Churchers Limited | Real estate | 1984 |
| Churchers Trust Corporation Limited | Professional & scientific | 2005 |
| Cipher NET Shield Ltd | Information & communication | 2023 |
| Circle K | | 1992 |
| City Legal Translations International Ltd | Extraterritorial | 1998 |
| City North Limited | Transport & logistics | 2007 |
| CJH Agri-Environment Consultants Ltd | Professional & scientific | 2006 |
| Classic Cabs (Grimstead) Ltd | Transport & logistics | 2003 |
| Cleall Builders Limited | Construction | 2003 |
| Clean Plan Services Limited | Administrative & support | 1999 |
| Clear View Consulting Limited | Construction | 2007 |
| Clemente Ltd | Health & social care | 2013 |
| Click More Limited | Information & communication | 2003 |
| Climate Control (Southern) Limited | Construction | 2001 |
| Cloudminded Limited | Information & communication | 2014 |
| Club in the Park Limited(The) | | 1973 |
| CMA Recruitment Group Limited | Financial services | 2019 |
| CMD Independent Financial Advisers Limited | Financial services | 2000 |
| Coach House Litigation LP | | 2013 |
| Coast 2 Coast Marine Transport Limited | Transport & logistics | 2004 |
| Coastalpoint Limited | Real estate | 1998 |
| Cobra Despatch Ltd | Transport & logistics | 2006 |
| Cochrane & Co Accountants Limited | Professional & scientific | 2007 |
| Cockram and Day Limited | Wholesale & retail | 1979 |
| Coco's Nails Ltd | Other services | 2018 |
| Cogo Ltd | Professional & scientific | 1999 |
| Colden Limited | Real estate | 1993 |
| Coley Chemicals Limited | Professional & scientific | 2005 |
| Colin Underwood Limited | Agriculture & fishing | 2002 |
| College Town Montessori Nursery School Limited | Education | 2002 |
| Collyers Services Limited | Agriculture & fishing | 1995 |
| Colourbox Collections Limited | Extraterritorial | 1999 |
| Comergy Limited | Manufacturing | 1997 |
| Compact Heating Products Limited | Extraterritorial | 2003 |
| Compucourse Limited | Information & communication | 2000 |
| Computers Network & Maintenance Limited | Information & communication | 1997 |
| Concept Metalcraft Limited | Manufacturing | 2004 |
| Concorde (2000) Limited | Wholesale & retail | 1991 |
| Configure 8 Limited | Manufacturing | 2002 |
| Congress Limited | Professional & scientific | 1996 |
| Conja Limited | Construction | 2001 |
| Connecting Technologies Limited | Information & communication | 1998 |
| Constable Hart & Co.Limited | Professional & scientific | 1903 |
| Constanter Trading Ltd | Wholesale & retail | 2025 |
| Consultant Futurity Services Limited | Wholesale & retail | 2004 |
| Contemplation Care Limited | Health & social care | 2007 |
| Contemplation Holdings Limited | Professional & scientific | 2003 |
| Contemplation Homes Limited | Health & social care | 2003 |
| Contract Construction Services Limited | Construction | 2006 |
| Cooks Maintenance Limited | Wholesale & retail | 1982 |
| Core Elements Limited | Wholesale & retail | 2007 |
| Corinium Construction Limited | Construction | 2005 |
| Corporate Aviation Technical Support Ltd | Manufacturing | 2005 |
| Corporate Upgrades Distribution Limited | Manufacturing | 1994 |
| Cort Way Limited | Hospitality | 2006 |
| Cosens Marine & General Limited | Manufacturing | 2005 |
| Countec Europe Ltd. | Extraterritorial | 2003 |
| County Apartments Limited | Hospitality | 2006 |
| Covelward Limited | Transport & logistics | 1977 |
| Coveract Accounting Services Limited | Professional & scientific | 2000 |
| Covetree Developments Limited | Financial services | 2000 |
| Cowley Computer Solutions Ltd | Information & communication | 2004 |
| Craig Worboys Associates Ltd | Construction | 2021 |
| Craigen, Brebner and Co. Ltd | Extraterritorial | 2023 |
| Cranbury (Holdings) Limited | Professional & scientific | 1963 |
| Cranbury Estates Limited | Construction | 1963 |
| Cranbury Home Farms Limited | Construction | 1962 |
| Cranbury Investment Company Limited | Construction | 1963 |
| Cranleys Consulting Limited | Professional & scientific | 1998 |
| Creation Partnerships Limited | Information & communication | 1998 |
| Creatiques Limited | Wholesale & retail | 2004 |
| Creative Web Ventures Limited | Wholesale & retail | 2004 |
| Credit Management Limited | Professional & scientific | 2000 |
| Creed Consulting Ltd. | Information & communication | 1998 |
| Cremate-A-Pet Limited | Water & waste | 2002 |
| Cricket Fine Art Limited | Wholesale & retail | 2008 |
| Crime Detection Systems Limited | Manufacturing | 1995 |
| Criss Catering Ltd | Transport & logistics | 2019 |
| Cristina Brunchi Ltd | Professional & scientific | 2015 |
| Crossbond International Marketing Services Limited | Real estate | 1997 |
| Crossway Garage Ltd | Wholesale & retail | 2002 |
| Crown Foods Limited | Hospitality | 1991 |