The Rout's Worst Losers

It was a rough day on Wall Street yesterday, with the S&P 500 losing 2.6 percent of its value. As Marketwatch pointed out, there were an unusual number of S&P stocks posting major declines. It's rough if one of your stocks loses 9 percent over the course of a year, but these S&P members all lost that in a single day yesterday:

• Mallinckrodt, down 12.6 percent
• Williams Cos., down 12.1 percent
• Endo International, down 10.2 percent
• Qorvo Inc., down 9.3 percent
• Chesapeake Energy, down 9.2 percent
• Freeport-McMoRan, down 9.1 percent