 IGM Biosciences NASDAQ:IGMS insider Daniel Shinyu Chen sold 602 shares of the firms stock in a transaction dated Tuesday, September 8th. The stock was sold at an average price of 50.20, for a total value of 30,220.40. Following the sale, the insider now directly owns 116,518 shares of the companys stock, valued at 5,849,203.60. The ... 