Name
 | URL | Country
| Market Cap (US$)
|
|---|
| Corporate Knight Services, Inc. | http://www.corporateknight.com/ | United States | Private |
| Cortex HR, Inc. | http://www.cortexhr.com/ | Canada | Private |
| Court Reporter's Clearinghouse, Inc. | http://www.crctexas.com/ | United States | Private |
| CRAssociates, Inc. | http://www.crassoc.com/ | United States | Private |
| Creative Associates International, Inc | http://www.caii.net | United States | Private |
| CROSSMARK | http://www.crossmark.com/ | United States | Private |
| CYC Holdings plc | http://www.cycholdings.com | United Kingdom | Private |
| Damgaard A/S | http://www.damgaard.com | Denmark | Private |
| David Jeffrey Associates, Inc. | http://www.davidjeffrey.com/ | United States | Private |
| Dean & Company | http://www.deanco.com/ | United States | Private |
| Decobel Inc | | United States | Private |
| Deer Consumer Products, Inc | NA | Canada | Public |
| Delinea Corporation | http://www.delinea.com/ | United States | Private |
| Democracy Data & Communications, LLC | http://www.democracydata.com/ | United States | Private |
| Derbyshire First Investments Limited | http://www.dfil.co.uk | United Kingdom | Private |
| Design Forum | http://www.designforum.com | United States | Private |
| Development Alternatives, Inc. | http://www.dai.com/ | United States | Private |
| DFI International, Inc. | http://www.dfi-intl.com/ | United States | Private |
| Diehl, Evans & Company, LLP | http://www.diehlevans.com/ | United States | Private |
| Digitas, Inc. | http://www.digitas.com/ | United States | Private |
|
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