The yield on the 10-year Treasury note fell 1 basis points to 1.59 percent.

Among other stocks making big moves:

â¿¿Freeport-McMoRan Copper & Gold plunged $6.12, or 16 percent, to $32.16 after the mining company said it is buying oil companies Plains Exploration & Production and McMoRan Exploration for about $9 billion.

â¿¿Mattress Firm Holding Corp. fell $6.65, or 22 percent, to $23.67 after the mattress retailer said late Tuesday that sales trends were softening.

â¿¿Pandora Media, an internet radio company, fell $1.65, or 17.5 percent, to $7.80 after saying it would make a much larger loss in the fourth quarter than analysts had been forecasting.

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