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For the week, the Dow and S&P 500 have each lost 1.9 percent, and the Nasdaq has lost 2.7 percent.

Among other companies making big moves Wednesday:

• Yum Brands jumped 8 percent, the top stock in the S&P 500 index. The parent of Taco Bell, Pizza Hut and other fast-food chains said results from China stores should remain strong, even as the Chinese economy slows. Yum gained $5.28 to $70.99.

• FedEx gained 5 percent, or $4.41 to $89.99. The world’s second-biggest package delivery company unveiled a restructuring plan Monday aimed at raising profits by $1.7 billion within three years. FedEx promised to shed jobs and underused aircraft.

• Costco posted stronger sales and earnings than forecast as more people signed up to buy the company’s diapers and groceries in bulk. Costco’s stock gained $1.92 to $101.56.

• Toyota Motor Corp. dropped $1.56 to $74.50 after the carmaker recalled a total of 7.4 million vehicles worldwide for a for a faulty power-window switch, the latest in a series of recalls for Toyota. The recall announced Wednesday affects more than a dozen models produced from 2005 through 2010.