How a band of Reddit traders drove GameStop stock up 275% in a week: CNBC After Hours

CNBC.com's MacKenzie Sigalos brings you the day's top business news headlines. On today's show, reporters from across the CNBC newsroom explain the GameStop phenomenon, in which a Reddit-fueled rally to punish short sellers is sending the stock skyrocketing above its fundamental valuation. Plus, a titan of the private equity industry steps back after an external review uncovered $160 million in payments to convicted sex offender Jeffrey Epstein.