Shares of GameStop Corp. (NYSE:GME) and AMC Entertainment Holdings, Inc. (NYSE:AMC), which had cooled off after a hot rally in mid-May, are surging higher in premarket trading on Monday. The resumption of the meme rally came on the back of Keith Gill, also known as “Roaring Kitty,” disclosing a substantial position in GameStop on the r/Superstonk Reddit forum. A screenshot shared by Gill on the platform showed he held 5 million GME shares valued at $115.70 million, and 120,000 call options worth $65.70 million, with a strike price of $20 and exercisable on June 21. The calls were purchased at …