Below is a list of the 40 worst performing stocks in the S&P 500 over the past two trading days. While a lot of the financials are down between 10% and 15%, it's the materials sector stocks that have gotten hit the hardest. Alpha Natural Resources (ANR) is down the most at -26.45%, followed by Cliffs Natural Resources (CLF) at -21.83%. Three more materials sector stocks round out the top five in Allegheny Technologies (ATI), Freeport-McMoRan (FCX), and U.S. Steel (X).
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