NEW YORK (TheStreet) -- Apple shares surged in premarket trading on Wednesday as investors responded to the tech giant's blowout second-quarter results, reported after the market closed on Tuesday. The iPhone maker's stock was up $50.67, or 9.04%, to $610.95 after the company again shredded Wall Street's estimates. Apple announced quarterly earnings of $12.30 a share on $39.2 billion in revenue.