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America's 12 biggest companies now

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

4.  Berkshire Hathaway

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4
  • Market cap: $353 billion
  • 2009 rank: 12

Under the steady hand of investing guru and CEO Warren Buffett, Berkshire Hathaway (BRKA)'s wings are wider than any company on this list, spanning every industry from insurance to manufacturing to finance and more.

Its investments include Kraft Foods, Goldman Sachs (GS) and Coca-Cola (KO) and as a conglomerate it has around 60 subsidiaries.

Four of the companies on this list -- ranked 6,7,9 and 12-- are part of Berkshire Hathaway's portfolio.

A Berkshire Hathaway class B stock costs around $145. Its class A stock costs over $215,000.

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

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