The Associated Press

Among the stock activity stories for Wednesday, Dec. 14, from AP Business News:

â¿¿ Shares of Joy Global Inc. fell after the mining equipment maker warned that production growth could moderate because of weaker demand for commodities.

â¿¿ Shares of Silicon Graphics International Corp. dropped after President and CEO Mark Barrenechea resigned to serve in the same roles at an enterprise software company.

â¿¿ A Baird analyst upgraded American Woodmark Corp. after the cabinet maker announced factory closings and cost cutting measures because of the weak housing market in the U.S.
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