Shares of Warren Buffett’s Berkshire Hathaway far outperformed the benchmark S&P 500 stock index over the decade of the 2000s, with a gain of 73.9% The S&P dropped 6% over the same ten-year period. In fact, Buffett has easily beat the S&P benchmark over the last 3 decades, with only 5 years in the negative and 25 positive years.