The U.S. Securities and Exchange Commission has hit former pharmaceutical executive and convicted stock fraudster Martin Shkreli with a sanction barring him from associating with brokers and ratings agencies.

Shkreli is serving a seven-year prison sentence for his conviction of two counts of securities fraud and related conspiracy count. He was convicted of running a scheme to defraud investors in two hedge funds he created, MSMB Healthcare and MSMB Capital Management.