The Dow Jones Industrial Average bounced 127.94 points, to close at 15,191.06, lifted by Microsoft and General Electric, extending gains after rallying nearly 1 percent in the previous session. The blue-chip index logged its first consecutive triple-digit gains since June.
Meanwhile, Goldman Sachs, Visa and Nike will join the Dow Jones Industrial Average, replacing Alcoa, Bank of America and Hewlett-Packard. The changes will be effective with the opening of trading on Sept. 23, S&P Dow Jones Indices said in a statement. The index changes were prompted by the low stock price of the three companies slated for removal and the index committee's desire to diversify the sector and industry group representation of the index.
(Read more: Here's what you needto know about the Dow index changes)
The S&P 500 rallied 12.28 points to end at 1,683.99. And the Nasdaq gained 22.84 points, to finish at 3,729.02. Both indexes finished higher for the sixth-straight session.
The CBOE Volatility Index (VIX), widely considered the best gauge of fear in the market, declined below 15.
Despite initial worries over a September swoon in equities, the Dow has rallied nearly 2.5 percent for the month so far, while the S&P 500 and the Nasdaq have jumped more than 3 percent each.
All key S&P sectors ended higher, led by financials and industrials.