Warren Buffett and Cathy Baron Tamraz

Warren Buffett and Cathy Baron Tamraz

Scott Eells/Bloomberg

Warren Buffett, chairman and chief executive officer of Berkshire Hathaway Inc., right, poses for a photograph with Cathy Baron Tamraz, president and chief executive officer of Business Wire, left, after ringing the opening bell at the New York Stock Exchange in a Sept. 30, 2011 file photo.