| Computer Client Services Limited | Information & communication | 1994 |
| Computer Netlink Systems Limited | Information & communication | 1995 |
| Computer Solution (UK) Limited | Information & communication | 1997 |
| Computers 2000 Limited | Information & communication | 1994 |
| Conceptioneering Limited | Administrative & support | 2005 |
| Concertland Ltd | Other services | 2015 |
| Connect 360 International Limited | Information & communication | 2006 |
| Cononiah Consults Ltd | Construction | 2007 |
| Conscience Creative LLP | | 2004 |
| Conscious Elevation Ltd | Administrative & support | 2024 |
| Consilium Associates Limited | Professional & scientific | 2006 |
| Consistent Training Solutions Limited | Information & communication | 2005 |
| Consolidation Consultancy Limited | Information & communication | 2004 |
| Conspicuous Limited | Administrative & support | 2000 |
| Constantia Developments Limited | Construction | 2004 |
| Consultants & Design Services Limited | Construction | 2007 |
| Contacts International Limited | Professional & scientific | 2005 |
| Contarnex Europe Limited | Wholesale & retail | 1996 |
| Contentity Limited | Information & communication | 2005 |
| Contract Support Services | | 2000 |
| Control Holdings Limited | Professional & scientific | 1989 |
| Control I.T. Systems Ltd. | Professional & scientific | 1999 |
| Cook Control Systems Limited | | 1980 |
| Coombe Wood Golf Club Limited | Arts & recreation | 1961 |
| Coombe Wood Lawn Tennis Club Limited | Arts & recreation | 1935 |
| Coombes Electrical Services Limited | Construction | 2021 |
| Coonan Concrete Pumping Limited | Construction | 2001 |
| Coonan Construction Limited | Extraterritorial | 2003 |
| Copthorne Management Limited | Real estate | 1980 |
| Copyscroller Products | | 1998 |
| Core Competence Management International Ltd. | Extraterritorial | 2006 |
| Core Technical Solutions Limited | Information & communication | 2007 |
| Cornwell Business Consultants Limited | Information & communication | 2007 |
| Cornwell Lord Limited | Professional & scientific | 2006 |
| Corporate Edge Limited | Professional & scientific | 1996 |
| Corporate Hardware Limited | Wholesale & retail | 1996 |
| Corrosion and Materials Consultants Limited | Professional & scientific | 1992 |
| Cortexcure Limited | Wholesale & retail | 2025 |
| COS Fit Happens Limited | Wholesale & retail | 2003 |
| Cost Reduction Services Limited | Professional & scientific | 1995 |
| Costurn Industrial Textiles Limited | Manufacturing | 1974 |
| Cottimore Local Limited | Wholesale & retail | 2021 |
| Coughlans Bakeries Limited | Manufacturing | 1937 |
| Counties Home Loan Management Limited | Financial services | 1989 |
| Country Carpet Holdings Limited | Financial services | 1987 |
| Country Carpet Warehouses Limited | Wholesale & retail | 1970 |
| Country Rugs Limited | Wholesale & retail | 2023 |
| Countrywide Carpets & Flooring Limited | Construction | 1985 |
| County Business School Limited | Education | 2016 |
| County Club,Guildford,Limited(The) | Other services | 1905 |
| County Insurance Agencies Limited | Financial services | 1999 |
| County Marquees Events Limited | Administrative & support | 2015 |
| Court House Mansions Freehold Limited | Households | 1998 |
| Couture Technologies Limited | Professional & scientific | 2024 |
| Coveney Nicholls Limited | Professional & scientific | 2001 |
| Covercourt Limited | Real estate | 1999 |
| Coverdale Homes Limited | Financial services | 2001 |
| Covert Intelligence Solutions Ltd | Administrative & support | 2007 |
| COW Corner Limited | Information & communication | 2007 |
| COX and Jones Limited | Construction | 2007 |
| COX Universal Enterprises Limited | Administrative & support | 1994 |
| Coxaegenu Ltd | Health & social care | 2025 |
| Coxwell Care Limited | Health & social care | 2005 |
| Coxwell Hall of Faringdon Ltd | Health & social care | 2013 |
| CPS (Contracts) Limited | | 1986 |
| CR and CC Company Limited | Households | 2005 |
| Crane Catering Services Limited | Manufacturing | 2003 |
| Cranleigh Arts Centre Limited(The) | Arts & recreation | 1982 |
| Cranleigh Autos Limited | Wholesale & retail | 2003 |
| Cranleigh Practice Ltd | Health & social care | 2007 |
| Cranleigh Radio Limited | Wholesale & retail | 1985 |
| Cranleigh School | Education | 1998 |
| Cranleigh Star Development Company Limited | Real estate | 2005 |
| Craving Solution Ltd | Wholesale & retail | 2020 |
| Crawley Insurance Brokers Limited | | 1972 |
| Craylyn Limited | Professional & scientific | 1982 |
| CRB Environmental Ltd | Professional & scientific | 2006 |
| Crdm Property Ltd | Administrative & support | 2025 |
| Create Pictures Ltd | Information & communication | 2002 |
| Creative Air Conditioning Services Limited | Construction | 2004 |
| Creative Connection Limited | Education | 2004 |
| Creative Response (Arts) Limited | Administrative & support | 2002 |
| Creegan Properties Limited | Construction | 1974 |
| Creegan Property Investments Limited | Construction | 1982 |
| Crescent AM Holdings Ltd | Financial services | 2023 |
| Crescent Hire Centre Ltd | Administrative & support | 1995 |
| Crescent Project Services Limited | Administrative & support | 2007 |
| Crest Data Limited | Financial services | 1967 |
| Crestfield Care Limited | Health & social care | 2005 |
| Cricketers Close Management Company Limited | Households | 2013 |
| Crisp Finance Limited | Professional & scientific | 1996 |
| Crispus Limited | Information & communication | 2007 |
| Critical on Call Ltd | Health & social care | 2012 |
| Crockford Cleaning Services Limited | Administrative & support | 2003 |
| Crofton Healthcare Limited | Health & social care | 2003 |
| Croftwood Care UK Limited | Health & social care | 2017 |
| Croham Road (72) Management Limited | Households | 1999 |
| Cromwell Engineering Limited | Construction | 1974 |
| Cromwells Estate Agents (CB) Limited | Real estate | 2007 |
| Cromwells Estate Agents (Wallington) Limited | Real estate | 2007 |