Check out the companies making headlines yesterday:

Cognex (NASDAQ: CGNX): Machine vision technology company Cognex (NASDAQ: CGNX) rose by 5% on Tuesday after Goldman Sachs issued a significant "double-upgrade" on the stock, moving its rating from Sell directly to Buy. See our full article here.

Is now the time to buy Cognex? Access our full analysis report here.

Flex (NASDAQ: FLEX): Global manufacturing solutions provider Flex (NASDAQ: FLEX) fell by 4.2% on Tuesday after the market reacted to weak U.S. jobs data and persistent concerns over the tech sector. See our full article here.

Is now the time to buy Flex? Access our full analysis report here.

iHeartMedia (NASDAQ: IHRT): Global media and entertainment company iHeartMedia (NASDAQ: IHRT) rose by 4.1% on Tuesday after the company announced an exclusive video podcasting partnership with Netflix. See our full article here.

Is now the time to buy iHeartMedia? Access our full analysis report here.

Booz Allen Hamilton (NYSE: BAH): Government consulting firm Booz Allen Hamilton (NYSE: BAH) fell by 6.9% on Tuesday after the company announced that its Chief Financial Officer, Matthew Calderone was resigning See our full article here.

Is now the time to buy Booz Allen Hamilton? Access our full analysis report here.

Limbach (NASDAQ: LMB): Building systems company Limbach (NASDAQ: LMB) rose by 4.7% on Tuesday after its board of directors approved a share repurchase program authorizing the company to buy back up to $50.0 million of its common stock. See our full article here.

Is now the time to buy Limbach? Access our full analysis report here.