I was in Roy Thomson Hall on Friday night here in Toronto for the world premiere of Dumb Money, the very fun Craig Gillespie film about the GameStop meme-stock frenzy of 2021. If you recall, during the height of Covid, retail investors ran up the share prices of GameStop and others, eventually inflicting a “squeeze” on irate institutional investors who had shorted the stocks. As the credits rolled and the audience applauded, I wondered what Ken Griffin—the Wall Street titan, billionaire proprietor of the Citadel hedge fund, and an alleged villain of the GameStop saga—thought of the film. You won’t believe this, but he’s not a fan.