Stocks slumped at the open as investors grew increasingly concerned over the economic impact of the devastating earthquake and tsunami that hit JapanFriday.
The Dow Jones Industrial Average fell more than 60 points after ending lower last week.
Among Dow components, General Electric , Boeing and 3M sank, while Pfizer gained.
So which individual stocks are worth watching today? Here are six that are on the move:
The tire company was trading at highs not seen since last January, with shares up more than 1 percent.
Las Vegas Sands
The casino was downgraded to hold from buy at Jefferies. The firm also cut the price target to $45 from $57.
The online reservation service was downgraded to neutral from buy at Merriman Capital, with shares down about 3 percent.
The telecom manufacturer was upgraded to buy from hold at Citi.
The pharmaceutical manufacturer was the only Dow component on the 52-week high list Monday, trading at levels not seen since January, 2010. Shares were up more than 3 percent on the day.
The solar products manufacturer was downgraded to neutral from overweight at Piper Jaffray.
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.