Take a look at some of Monday's midday movers:
Apple hit a fresh 52-week low.
Radian Group traded at a 52-week high after the company was upgraded to "outperform" from "market perform" at Keefe, Bruyette & Woods with a price target of $12.
Intuitive Surgical added to last week's losses following a report about an investigation into its da Vinci robot. The medical device maker was the worst performer on the Nasdaq 100 index.
Caterpillar was the worst performer on the Dow on concerns about growth in China.
—By CNBC's Lori Spechler
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Patti Domm is CNBC Executive Editor, News, responsible for news coverage of the markets and economy.
A CNBC reporter since 1990, Bob Pisani covers Wall Street from the floor of the New York Stock Exchange.
Senior Producer at CNBC's Breaking News Desk.
Dominic Chu is a markets reporter for CNBC.
Evelyn Cheng is a markets writer for CNBC.
Sara Eisen is a correspondent for CNBC, focusing on currencies and the global consumer.