Stocks added to declines as a lack of positive news failed to counter worries about Europe's efforts to address debt problems in Ireland, as well as other periphery euro zone countries.
So which individual stocks are worth watching today? Here are six that are on the move:
O'Reilly Automotive Inc
The automotive parts retailer was trading at an all-time high with shares up more than 1 percent Monday.
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Aeropostale Inc
The clothing retailer was downgraded to neutral from buy at Buckingham.
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Sandisk Corporation
The semiconductor company was upgraded to outperform from neutral at RW Baird. The firm also increased the price target to $56 from $42.
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Supervalu Inc
The food wholesaler and retailer was trading at lows not seen since November 2008. The shares were down nearly 1 percent Monday.
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The restaurant chain was trading at all-time high levels with shares up more than 1 percent Monday.
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Hormel Foods Corp
The food products company was initiated outperform at BMO Capital with a $57 price target.
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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.