Alkermes plc (NASDAQ:ALKS - Get Free Report) EVP David Joseph Gaffin sold 2,034 shares of the firm's stock in a transaction on Monday, May 4th. The stock was sold at an average price of $33.20, for a total value of $67,528.80. Following the completion of the transaction, the executive vice president owned 231,558 shares of the company's stock, valued at $7,687,725.60. This trade represents a 0.87% decrease in their position. The sale was disclos…