Ultragenyx Pharmaceutical Inc. (NASDAQ:RARE - Get Free Report) CFO Howard Horn sold 4,683 shares of the firm's stock in a transaction dated Friday, May 1st. The shares were sold at an average price of $24.90, for a total transaction of $116,606.70. Following the completion of the sale, the chief financial officer owned 110,342 shares of the company's stock, valued at approximately $2,747,515.80. The trade was a 4.07% decrease in their position. …