Last month Carl Icahn dumped Apple's stock and ran for the exit over concerns of a crackdown on Apple's iTunes in China. Today we're learning that the Oracle of Omaha sank his teeth into Apple stock on March 31. Aside from Apple, IBM is the only other technology company that Berkshire owns a significant stake in.

The Financial Times reports today that "The stake in Apple also represents a departure for Mr Buffett. The 85-year-old has made no secret of his aversion to investing in technology companies, saying in the past that they are either too complicated or that it is hard to determine whether they pass his "moat" test.

The moat concept is a principle of Mr Buffett's style of value investing. It refers to the competitive advantage a company has in its business that allows it to generate long-term profits and continue growing market share versus competitors.

Apple's shares are up than 2 percent this morning in pre-market trading after Warren Buffett's Berkshire Hathaway disclosed in a quarterly regulatory filing that it holds a 9.81m stake in the company as of March 31."

About Making Comments on our Site: Patently Apple reserves the right to post, dismiss or edit any comments.