 Mario Rosati, at Aehr Test Systems NASDAQ:AEHR, made a large buy and sell of company shares on September 29, according to a new SEC filing. What Happened: A Form 4 filing from the U.S. Securities and Exchange Commission states that Mario Rosati exercised options to purchase 25,183 Aehr Test Systems shares at prices ranging from 2.06 to 2,063 per share for a total of 12,829,762 on September 29. 