To many, Mr. Gill—who until recently worked in marketing for Massachusetts Mutual Life Insurance Co.—is the force behind the quadruple-digit gains in shares of the videogame retailer GameStop, up more than 1600% this year through Friday. Many online investors say his advocacy helped turn them into a force powerful enough to cause big losses for established hedge funds and, for the moment, turn the investing world upside down.
“People were doing a quick take, saying GameStop was the next Blockbuster, ” he said, a chain caught in a retail decline. “It appeared many folks just weren’t digging in deeper. It was a gross misclassification of the opportunity.”