Warren Buffett to CNBC: I bought more IBM in Q1 By: CNBC.com News May 02, 2015 at 08:47 AM EDT Apparently taking advantage of a dip in IBM's stock price, Warren Buffett bought more shares, adding to Berkshire Hathaway's $13.4 billion stake. Read More >> Related Stocks: Berkshire Hathaway International Business Machines