The swing came amid an unusually high-volume trading session, with more than 200 million Nvidia shares trading hands in the first 100 minutes of trading, topping the stock’s median full-day volume over the prior 20 trading sessions of 196.5 million, according to Yahoo Finance data.

U.S. stocks climbed Thursday after market superstar Nvidia and another round of companies said they’re making even fatter profits than expected. The S&P 500 pulled 0.5% higher after flipping between gains and losses several times during the day.