Keith Gill, alias Roaring Kitty, faces a probe by regulators in Massachusetts over his trades in GameStop (NYSE:GME) stock. Gill, who led the 2021 meme stock rally, recently bought a big block of GameStop common and options. He advertised the positions by posting them to X, formerly Twitter. He also showed a screenshot of his positions on Reddit’s Superstonks subreddit. GME stock rose 5.5% on June 4 but fell slightly overnight. It was due to open this morning at about $26.80 per share, a market capitalizati ...