Among the stock activity stories for Friday, Sept. 14, from AP Business News:
— Shares of SkyWest Inc. rose after the regional airline operator announced a share buyback and was upgraded by Raymond James & Associates.
— RDA Microelectronics Inc.'s shares jumped after the semiconductor company announced a special dividend.
— Triumph Group Inc.'s stock climbed as an analyst raised her price target on the company, saying she views it as one of the most compelling names in commercial aerospace.
