Stocks tumbled after news the ratings outlook for the United States was revised to "negative" by Standard & Poor's, although the rating agency affirmed the nation's triple-A ratings.
Here are six that are on the move:
The mining company was trading at all-time highs not seen since 1987.
The hotel chain was upgraded to outperform from market perform at FBR Capital.
The software company was downgraded to hold from buy at Citi.
The pizza delivery chain was downgraded to hold from buy at Stifel Nicolaus.
The industrial supplier was a bright spot Monday, up more than 2 percent.
The clothing retailer was downgraded to neutral from buy at Bank of America Merrill Lynch.
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