Although Buffett has an enviable record of investment success, he readily admits that most of his decisions have been average. In his annual shareholder letter this year, he said that he’s made about 12 really good decisions over the past 60 years—that is, about one every five years. These 12 investments, including early purchases of Coca-Cola and American Express, account for the bulk of the market-beating returns of Berkshire Hathaway.
One question put to Buffett and Munger was whether they were concerned that Berkshire’s stock portfolio was now over 30% in Apple, due to price increases since the shares were purchased. The questioner pointed out that some prominent advisers suggest that no more than 20% of a portfolio should be invested in a single company. Mr. Munger’s pungent reply: “I think he’s out of his mind.”
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