Among the stock activity stories for Friday, Aug. 3, from AP Business News:
— Shares of Tesla Motors Inc. rose on investor optimism that the electric car company's supply problems are being resolved and the ramp up in production of its key new model is on schedule.
— Blue Nile Inc. shares leaped after the online diamond and jewelry retailer forecast 2012 earnings that exceeded analysts' projections.
— PerkinElmer Inc. shares climbed after the health and industrial sciences company posted solid second-quarter results and maintained its full-year forecast despite the shaky European economy.
