Warren Buffett is known as being a patient investor. But is he too patient with five stocks, including some in the S&P 500?X All five of the U.S.-listed stocks (and classes of stocks) Buffett's Berkshire Hathaway added to in the fourth quarter, including Sirius XM Holding (SIRI), Liberty SiriusXM (LSXMA) and Chevron (CVX), are lagging again this year so far after underperforming all of last year too, says an Investor's Business Daily analysis of data from S&P Global Market Intelligence and MarketSmith.The f ...