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.
The Dow Jones Industrial Average fell nearly 200 points after ending last week slightly lower.
Here are six that are on the move:
Royal Gold
The mining company was trading at all-time highs not seen since 1987.
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Hyatt
The hotel chain was upgraded to outperform from market perform at FBR Capital.
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BMC Software
The software company was downgraded to hold from buy at Citi.
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Papa Johns
The pizza delivery chain was downgraded to hold from buy at Stifel Nicolaus.
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WW Grainger
The industrial supplier was a bright spot Monday, up more than 2 percent.
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Gap
The clothing retailer was downgraded to neutral from buy at Bank of America Merrill Lynch.
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