Morgan Stanley's trading platform, E*Trade, is considering removing Keith Gill, also known as Roaring Kitty, from its platform over concerns of potential stock manipulation related to his recent purchases of GameStop (GME) call options, sources say. Gill reportedly bought a large volume of GameStop call options before a significant rally in May, which has prompted internal discussions at Morgan Stanley about whether these trades amount to market manipulation. The SEC is also reviewing trades around the time of Gill's social-media posts to determine if there was any manipulative activity, according to WSJ.