It's no secret by now that Apple (NASDAQ: AAPL) is Warren Buffett's favorite stock.

The Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) chief has sung its praises time and again, calling it a "wonderful business" and even saying it's "probably the best business I know in the world."

Despite the company's size and Buffett's fondness for the iPhone maker, it may still come as a surprise to learn Apple now makes up 51% of Berkshire Hathaway's stock portfolio as of the end of the second quarter.

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Source Fool.com