History suggests Apple has much more room to run By: CNBC.com News April 28, 2015 at 12:43 PM EDT A closer look at the mega-cap leaders of the S&P 500 over the last 30 years suggests that Apple's market value could balloon to more than $1 trillion. Read More >> Related Stocks: AT&T Inc Apple Atlantic Power Corp Exxon Mobil General Electric International Business Machines Microsoft