Roku Inc. /zigman2/quotes/205087179/composite ROKU -3.79% said late Monday its Chief Executive Steve Louden plans to step down at an unspecified date. Louden will help the streaming-device maker to hire his successor, Roku said. He joined Roku as CFO in 2015. He plans to relocate to the Seattle area with his family "after assisting with a smooth transition," Roku said. Shares of Roku fell 3.8% in the extended session after ending the regular trading day up 4.4%.