File photo of Berkshire Hathaway Chairman Buffett acknowledging crowd after playing table tennis at the Berkshire Hathaway annual meeting weekend in Omaha

 
File photo of Berkshire Hathaway Chairman Buffett acknowledging crowd after playing table tennis at the Berkshire Hathaway annual meeting weekend in Omaha
Berkshire Hathaway chairman Warren Buffett acknowledges the crowd after playing table tennis at the Berkshire Hathaway annual meeting weekend in Omaha, Nebraska, in this May 2, 2010 file photo. Buffett has donated another $1.93 billion to five charitable foundations, the third-highest amount since the investor began donating 99 percent of his wealth in 2006, according to a July 2, 2010 filing with the U.S. Securities and Exchange Commission. REUTERS/Rick Wilking/Files (UNITED STATES - Tags: PROFILE SOCIETY BUSINESS)