西西软件园 Stock pickers encountered difficulty this year in part because of concentration at the top of the market. Just five stocks—Apple, Berkshire Hathaway, Johnson & Johnson, Microsoft, and Intel— accounted for 20% of the market’s gains. If you weren’t at least equally weighted toward them, you had virtually no shot at making up for missing their enormous, index-driving gains. A majority of the market’s stocks did not perform nearly as well. According to the Leuthold Group, only 30% of S&P 1500 stocks posted gains exceeding the index itself. You’d have to go back to 1999 to see anything like this.