Ken Griffin's Citadel and Citadel Securities' Profiles have Risen with GameStop Frenzy. Now the Firms have Caught the Attention of Lawmakers. (Business Insider) It seems that wherever you look in the GameStop frenzy, there's a Ken Griffin connection. In the past two weeks, the concentrated effort of retail traders, mobilized in large part on Reddit's WallStreetBet's forum and other social media sites, helped push shares of heavily-shorted companies like GameStop, AMC, and others to dizzying heights.