Warren Buffett, chairman and chief executive officer of Berkshire Hathaway.
Mandatory Credit:	Daniel Acker/Bloomberg/Getty Images via CNN Newsourc

Warren Buffett, chairman and chief executive officer of Berkshire Hathaway.
Mandatory Credit: Daniel Acker/Bloomberg/Getty Images via CNN Newsourc

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Warren Buffett: Berkshire’s boom days may be over; company approaches $1 trillion in value

Berkshire Hathaway neared a $1 trillion market valuation Monday after a record-breaking year, but CEO Warren Buffett warned in his annual letter to investors that more skyrocketing performances are likely a thing of the past.