The return of “Roaring Kitty” has boosted several so-called meme stocks in the U.S. markets this morning.

Keith Gill’s @TheRoaringKitty account on the social media platform X was dormant from June 2021 until Sunday night, when the account posted an image of a man holding a controller and moving to sit forward in his chair, a meme frequently used by video gamers. That post alone was enough for GameStop’s stock to spike more than 100% Monday morning, being halted for trading several times for volatility. 

Gill and the subreddit /WallStreetBets were at the center of the 2021 meme stock frenzy when shares of GameStop and AMC Entertainment, among others, surged more than 1,000% by the end of the year. Other struggling stocks like BlackBerry and Bed, Bath & Beyond also dealt with …