On Friday, the Federal Trade Commission (FTC) filed a formal complaint against three major pharmacy benefit managers (PBMs)—CVS Health Inc’s (NYSE:CVS) Caremark, Cigna Corp’s (NYSE:CI) Express Scripts,

The owner of one of the three largest pharmacy middlemen in the United States on Tuesday filed suit to quash an attempt by the Federal Trade Commission to investigate industry practices. However, the suit relies on research that the health conglomerate helped pay for and was conducted by an economist who’s become wealthy arguing in support of huge mergers.