â¿¿ Advanced Micro Devices, a chipmaker, slumped 16 cents, or 7.7 percent, to $1.93 after the company denied a report that said it was considering a sale. The stock has lost about 77 percent since March because of dwindling sales.

â¿¿ Facebook jumped $2.50, or 12.6 percent, to $22.36. Wednesday was the expiration of a so-called lockup period that prevents insiders from selling stock immediately after a company goes public. About 850 million shares are being freed for sale.

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