Valuable insights on the character of a bull run in stocks can be gained by investigating the companies leading the rally. The table below lists the 10 best performing S&P 500 stocks since the October 3,2011 low. My table shows the marketโ€™s biggest winners are among the most speculativeโ€”homebuilders, distressed financials, and tech companies. What does that say about the 28% rally in the S&P 500 since the October 3 low? Speculative sentiment is the dominant force in the stock market today. Invest accordingly.