Among the stock activity stories for Friday, March 15, from AP Business News:
— Shares of iPhone maker Apple Inc. rose after its chief competitor, Samsung Electronics Co., revealed a new top-of-the-line smartphone model.
— Ironwood Pharmaceuticals Inc. shares hit an all-time high following an analyst upgrade on the drug maker's stock.
— Shares of Suntech Power Holdings Co. Ltd. bounced back, following two days of big stock declines as the struggling Chinese solar panel company approached a debt payment.
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