Billionaire investor Warren Buffett announced on CNBC Monday morning that his Berkshire Hathaway holding company has bought $10.7 billion of stock in IBM. Buffett said the company began investing in March, and now owns 64 million share of IBM, or 5.5 percent of the computer and technology company. The buy is a bit of a shift for Buffett, who has in the past avoided purchasing tech stocks. Erik Holm of The Wall Street Journal reports on the latest.