Shares in the video game retailer more than doubled at one point after a prominent meme stock investor made his first online posting in about three years.

In a recent interview with NPR, S.E.C. Chairman Gary Gensler says one of his top priorities is protecting amateur investors as his agency unveils a number of tough new rules and investigations.

The House Financial Services Committee held a hearing where members probed major players in the GameStop and meme stock story.