Among the stock activity stories for Wednesday, May 13, from AP Financial News:

NEW YORK (AP) ¿ Shares of one of the nation's largest trucking companies, YRC Worldwide Inc., sank as investors continued to worry that it might not meet its credit requirements this quarter.

NEW YORK (AP) ¿ Shares of Dow Chemical Co. dropped after the government posted poor retail numbers, showing consumers are spending less on items made using products from the chemical industry.

NEW YORK (AP) ¿ Superior Well Services Inc.'s dismal first-quarter results, a weak demand outlook, price erosion and overall industry weakness prompted analysts to downgrade the company's stock.

NEW YORK (AP) ¿ Shares of restaurant chain Landry's Restaurants Inc. jumped after the company announced its chief executive bought more of its shares earlier this month ¿ a sign one analyst said that CEO Tilman Fertitta may still want to buy the chain.
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