Prothena Corporation plc (NASDAQ:PRTA - Get Free Report) major shareholder William Scully bought 162,000 shares of the firm's stock in a transaction that occurred on Tuesday, September 29th. The shares were acquired at an average cost of $8.68 per share, with a total value of $1,406,160.00. Following the purchase, the insider directly owned 214,000 shares of the company's stock, valued at $1,857,520. This trade represents a 311.54% increase in t…