The S&P 500 and the Dow hit record intraday highs on Tuesday, while the Nasdaq turned positive for the first time this year, buoyed by rising prospects of global economic health and with Alcoa getting the U.S. earnings season off to a promising start.
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The S&P 500 hit 2,155.32, breaking past its previous record on Monday. The Dow hit an all-time high of 18,360.51.
Alcoa's quarterly profit fell less than expected, sending the aluminum producer's shares to a five-month high of $10.67 and helping boost optimism about the earnings season.
Strong economic data and low returns on government bonds along with easing political tensions in Britain and Japan have reduced some global uncertainties and boosted investor appetite for equities.
"There are no good alternatives, from an income standpoint, to the U.S. equity markets at this point, and that's driving the momentum today," said Bill Northey, chief investment officer at Private Client Group of U.S. Bank.
"But we need to see some supporting earnings growth to accompany this move."
While profits of S&P 500 companies are estimated to have fallen 5 percent in the second quarter, mirroring the first, analysts see a return to growth throughout the second half of the year, according to Thomson Reuters data.
At 12:23 p.m. ET the Dow Jones industrial average was up 128.78 points, or 0.71 percent, at 18,355.71.
The S&P 500 was up 17.16 points, or 0.8 percent, at 2,154.32.
The Nasdaq Composite was up 40.59 points, or 0.81 percent, at 5,029.23.
Among the 10 major S&P sectors, the traditionally defensive sectors, utilities, telecoms and consumer staples fell. The three indexes have risen in double-digit percentages this year.
Oil's bounce off a two-month low boosted materials and energy shares.
Strong corporate reports, along with low expectations for a hike in interest rates anytime soon, should keep the momentum in the market going.
United Continental jumped 7 percent after saying its quarterly passenger unit revenue would drop less than expected. The outlook also boost other airlines 3-9 percent.
Amazon.com hit a record high of $757.34 before slipping 0.6 percent. The retailer said it resolved a glitch some customers experienced at its "Prime Day" shopping event.
Hard-disk drive maker Seagate jumped 16.2 percent to $28 on strong preliminary results. Rival Western Digital rose 3.5 percent.
Advancing issues outnumbered decliners on the NYSE by 2,285 to 684. On the Nasdaq, 2,113 issues rose and 650 fell.
The S&P 500 index showed 69 new 52-week highs and one new low, while the Nasdaq recorded 154 new highs and 11 new lows. (Reporting by Yashaswini Swamynathan in Bengaluru; Editing by Savio D'Souza)