| Name | Exchange | Symbol | Last trade | Change | Mkt cap | |
| Flasp�hler Research Group | Private | |||||
| Maritz Research Inc. | Private | |||||
| The PreTesting Company, Inc. | Private | |||||
| Walker Information, Inc. | Private | |||||
| Burke, Inc. | Private | |||||
| J.D. Power and Associates, Inc. | Private | |||||
| Press Ganey Associates, Inc. | Private | |||||
| Abt SRBI Inc. | Private | |||||
| Research Data Analysis, Inc. | Private | |||||
| The Blackstone Group, Inc. | Private | |||||
| marketRx, Inc. | Private |