America's 12 biggest companies now

In the past 6 years, giants like Exxon and Walmart have slid while tech companies have soared.

1.  Apple

tim cook wwdc apple
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  • Market cap: $698 billion
  • 2009 rank: 33

Apple (AAPL) started off 2015 with a bang, posting the biggest quarterly profit in U.S. corporate history.

Why was it ranked so low in 2009? Mainly because that's 20-something generations ago in Apple years -- the iPad was still a rumor, Apple's iPod Nano got a video camera and the iPhone 3G was just released.

Apple's stock did recently nosedive 8% when iPhone sales didn't meet expectations, but Wall Street is betting that Apple will create a new personal record with a $53 billion annual profit for the current fiscal year.

  @CNNMoneyInvest - Last updated August 03 2015 11:35 AM ET