Among the stock activity stories for Tuesday, Oct. 9, from AP Business News:
— Shares of Questcor Pharmaceuticals Inc., which had lost 60 percent of their value in the last four weeks, recovered some lost ground Tuesday after a Jefferies & Co. analyst upgraded the biopharmaceutical company's stock.
— Penn Virginia Corp.'s stock fell after the oil and gas company announced a public stock offering and preferred equity offering.
