In 2011, something led Warren Buffett (Trades, Portfolio) to change his opinion of the technology sector. The billionaire investor had avoided technology stocks for the majority of his career until 2011, when he directed Berkshire Hathaway ( BRK.A , Financial) ( BRK.B , Financial) to acquire a substantial stake in IBM ( IBM , Financial).
Warren Buffett Cut His Losses in Tech to Invest in What He Knows