Stocks tumbled after a combination of factors, including a surprising trade deficit in China and weak jobless claims, sent investors scurrying to safe-haven assets like Treasurys.
The Dow Jones Industrial Average plunged nearly 200 points after falling a little more than a point in choppy trading on Wednesday.
So which individual stocks are worth watching today? Here are six that are on the move:
JDS Uniphase
The telecom company was upgraded to overweight from equal-weight at Evercore Partners. Shares were up 3 percent on a down day overall.
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Northrop Grumman
The defense contractor was upgraded to sector perform from underperform at RBC Capital with a price target of $75
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UBS
The bank was downgraded to sell from buy at MF Global, and shares were down more than 2 percent.
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Cisco
The telecom equipment maker was trading at lows not seen since July, 2009.
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Anheuser-Busch Inbev
The brewing company was upgraded to buy from neutral at Goldman Sachs.
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General Motors
The automaker was trading about 2 percent lower Thursday after CFO Chris Liddell announced his is stepping down..
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Get the latest stock picks on the CNBC Stock Blog, and see what analysts and others are watching before the bell each day at Analyst Watch.