Coca-Cola (NYSE: KO) is a popular Warren Buffett stock that has an excellent track record for dividend growth and overall profitability. It may be surprising for investors to learn that despite having such a strong business, Coca-Cola hasn't made for a good investment over the past decade. What's notable in the chart above is that over the past decade, Coca-Cola stock has outperformed the S&P only in years when the index's returns were negative.