Adobe CEO Shantanu Narayen will step down after a successor is named; he became CEO in 2007 and will remain as chair of the board; ADBE drops 6%+ after hours (Jordan Novet/CNBC)

Jordan Novet / CNBC: Adobe CEO Shantanu Narayen will step down after a successor is named; he became CEO in 2007 and will remain as chair of the board; ADBE drops 6%+ after hours   —  Adobe said CEO Shantanu Narayen will step down after a successor has been appointed, and he will remain as the design software company's chair.