Warren Buffett and his team at Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) have been nearly synonymous with Apple (NASDAQ: AAPL) since taking a position in the stock in 2014. The investment (and all the stock they bought along the way) turned out to be smart and made Berkshire a substantial profit.

However, Berkshire has started to sell Apple stock despite voicing its belief in the business. At one point, Apple made up more than half of Berkshire's investment portfolio; now, it has retreated to less than 40%.

So why is Berkshire reducing its stake in one of Buffett's favorite companies? The answer may surprise you.

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Source Fool.com