The people who manage the blue-chip index are substituting Goldman Sachs, Nike and Visa for Alcoa, Bank of America and Hewlett-Packard.
Apple pushes the Nasdaq and Nasdaq-100 to 13-year highs, and the Dow jumps 141, its best day since mid-July, thanks to gains from Caterpillar, 3M and IBM.
The Dow has its first weekly gain in a month, but stocks end basically flat on worries about continuing slow job growth. Syria worries add to volatility.
The Labor Department issues its August report before Friday's open. Investors are looking for data that give the Fed room not to trim its bond buying.
With geopolitical tensions mounting and a budget battle looming in Washington, it's hard to see when or why the worries might stop.
The downside risk in terms of the Nasdaq is 21.8% by year end.
The Dow falls nearly 4.5% for the month as stocks suffer modest losses. September, historically a tough month, looms. Markets are closed Monday for Labor Day.
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