Buffett adds to Wells Fargo, Wal-Mart, IBM holdings

http://www.usatoday.com/story/money/business/2013/05/15/warren-buffett-wal-mart/2164007/

Proving once again that he's a long-term investor, not a day trader, billionaire investor Warren Buffett's Berkshire Hathaway made few changes to its closely followed $85 billion stock portfolio in the first quarter.

Berkshire increased stakes in three blue-chip favorites, adding a global player in energy infrastructure, and bidding farewell to just two names, according to a regulatory filing Wednesday.