Top S&P 500 Stocks’ Role Is One Less Thing to Worry About

Driver of index’s current advance is nothing unusual.

Worried about only a handful of stocks pushing the S&P 500 Index higher? Don’t be, according to Dubravko Lakos-Bujas, head of U.S. equity strategy at JPMorgan Chase & Co. In a report Friday, he cited data showing the 10 stocks adding the most to the index this year accounted for a combined 35 percent of its advance. That was in line with the 36 percent figure since 1991 and far below the 66 percent when stocks peaked in 2000.

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