 Regeneron Pharmaceuticals Inc NASDAQ:REGN Director George L. Sing sold 3,000 shares of the stock in a transaction that occurred on Monday, June 29th. The stock was sold at an average price of 608.91, for a total value of 1,826,730.00. Following the sale, the director now owns 115,415 shares in the company, valued at 70,277,347.65. The ... 