(CNBC) — U.S. stocks climbed on Monday, with the S&P 500 bouncing back from its biggest weekly drop since 2012, as companies including Berkshire Hathaway reported results.
"I've been a believer for months that every time we get a sell off, it's a buying opportunity," said Randy Frederick, managing director of active trading and derivatives at Charles Schwab.
Groupon rallied a day before the provider of online deals reports quarterly earnings, with other Internet names including Yelp and Facebook also surging.