Billionaire Warren Buffett's Berkshire Hathaway (BRK.A) quadrupled its stake in Apple (AAPL) during the fourth quarter. Last year, Apple shares slumped 30% from its prior record back in 2015, but are now up 17% year-to-date, as the stock reached a record high earlier this week. But Michael Ingram, a market analyst with BGC Partners, based in London, questions how much more growth is left in the stock. He said the company needs to make an acquisition, as it relies too heavily on iPhone revenue. TheStreet's Scott Gamm reports from Wall Street.
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