Among the stock activity stories for Wednesday, Sept. 26, from AP Business News:
— Shares of Chesapeake Energy Corp. fell after an analyst downgraded the oil and gas company, saying its shares will have a tough time moving any higher.
— Shares of Texas Instruments Inc. slipped and Oppenheimer & Co. cut its rating as the chipmaker shifts the focus of its wireless investments from smartphones and tablets to industrial and automotive customers
— Shares of GT Advanced Technologies Inc., which makes products for the solar and LED industries, fell as an analyst lowered the company's rating and price target because he believes the company will not be able to capitalize in the near term on its sapphire cover glass, a scratch-proof material used in cellphones and cameras.
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