For decades, Berkshire Hathaway (NYSE:BRK.B) Chairman and CEO Warren Buffett maintained a pretty conservative approach to investing, favoring retail and banking stocks while giving a wide berth to more volatile sectors such as tech and energy. However, he finally pulled the trigger on PetroChina Co. (NYSE:PTR) in 2002 and Apple Inc. (NASDAQ:AAPL) in 2011. The Oracle’s foray into energy and tech initially paid off after he realized a tidy $3.5B profit on PetroChina, while his $158 billion…
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