Shark Tank Season 4 (airing from September 2012 to May 2013) is widely considered a turning point for the series. While the core panel of Mark Cuban, Daymond John, Kevin O’Leary, Robert Herjavec, and Lori Greiner remained the anchors, the season introduced a powerful rotation of Guest Sharks who brought fresh perspectives, industry-specific expertise, and new deal-making styles to the tank.