Deeply embattled biotechnology specialist Novavax (NASDAQ:NVAX) popped dramatically higher on Monday, closing up 11.25% against the Friday session. Earlier on the day, the company announced a change of leadership, with Novavax President and CEO Stanley C. Erck stepping down. Taking Erck's place will be industry veteran John C. Jacobs, who left the helm of Harmony Biosciences (NASDAQ:HRMY).