Name
 | URL | Country
| Market Cap (US$)
|
|---|
| 360i.com, Inc. | http://www.360i.com/ | United States | Private |
| A. Dawn Lesh International | | United States | Private |
| A.G. Page Associates, Inc. | http://www.a-g-page.com/ | United States | Private |
| Aberdeen Group, Inc. | http://www.aberdeen.com/ | United States | Private |
| Acento Advertising, Inc. | http://www.acento.com | United States | Private |
| Action Figure, Inc. | http://www.actionfigure.com/ | United States | Private |
| Actuarial Consultants, Inc. | http://www.acibenefits.com/ | United States | Private |
| AD-TECH Communications | http://www.medadtech.com | United States | Private |
| Adamson & Partners Limited | http://www.adamsons.com | United Kingdom | Private |
| Adamson Advertising, Inc. | http://www.adamson-inc.com/ | United States | Private |
| Adler Chomski Marketing Communication Ltd | NA | Israel | Private |
| Adlink Cable Advertising, LLC | http://www.adlink.com/ | United States | Private |
| Admarketing Inc. | | United States | Private |
| Adolfo Aguilar Agency, Inc. | http://www.ccagency.com | United States | Private |
| Adventures in Advertising Franchise, Inc. | http://www.discoveraia.com | United States | Private |
| Affinity Solutions | http://www.affinitysolutions.com | United States | Private |
| Agents Inspired Technologies | http://www.agentsinspired.com | Spain | Private |
| Agri-West International, Inc. | | United States | Private |
| Aistrup Associates | http://www.aistrup.com/ | United States | Private |
| Akzenta Ag | | Germany | Private |
|
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