Name
 | URL | Country
| Market Cap (US$)
|
|---|
| Buzztone.com, Inc. | http://www.buzztone.com/ | United States | Private |
| CA Coutts Holdings plc | http://www.cacouttsholdings.com | United Kingdom | Private |
| CallTech Communications, LLC | http://www.calltech.com/ | United States | Private |
| Calysto Communications, Inc. | http://www.calysto.com | United States | Private |
| Campbell Mithun Esty | http://www.campbellmithun.com | United States | Private |
| Campbell-Ewald Advertising Company | http://www.campbell-ewald.com | United States | Private |
| Cannondale Associates, Inc. | http://www.cannondaleassoc.com | United States | Private |
| Career Management Consultants, Inc. | http://www.career-management.com | United States | Private |
| Career Partners International Llc | http://www.cpiworld.com | United States | Private |
| Carlson Marketing Group | http://www.carlsonmarketing.com | United States | Private |
| Carmichael Lynch, Inc. | http://www.carmichaellynch.com/ | United States | Private |
| Carrizo Communications | http://www.carrizo.com/ | United States | Private |
| Catalyst Direct, Inc. | http://www.catalystdirect.com | United States | Private |
| Celent LLC | http://www.celent.com/ | United States | Private |
| Certiport, Inc | http://www.certiport.com | United States | Private |
| Chabon Entertainment Group, Inc. | http://www.chabongroup.com/ | United States | Private |
| Charter Solutions Ltd. | http://www.charter-consult.co.uk | United Kingdom | Private |
| CheetahMail, Inc. | http://www.cheetahmail.com | United States | Private |
| Chemistry Communications Group plc | http://www.chemistrygroup.com/ | United Kingdom | Public |
| Cheskin | http://www.cheskin.com/ | United States | Private |
|
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