(For a live blog on the U.S. stock market, click or type LIVE/ in a news window)
* Fed Chair Jerome Powell wraps up two-day economic report
* Lyft slides after disappointing revenue outlook
* Tech stocks lead rally, chips gain
* Indexes up: Dow 0.94%, S&P 0.64%, Nasdaq 0.90% (Updates to late afternoon, changes dateline, byline)
By Stephen Culp
NEW YORK, Feb 12 (Reuters) - Wall Street closed at record highs on Wednesday as news that the coronavirus outbreak could be running out of steam kept buyers in the ring.
Technology shares led the broad-based rally, which pushed all three major U.S. stock averages to fresh highs. The S&P 500 and the Nasdaq have now set closing highs for three consecutive sessions. The Dow reached its most recent closing record on Feb 6.
China reported its lowest number of new coronavirus cases in two weeks, the day after Beijing's senior Chinese medical adviser said the epidemic could be over by April.
"Obviously, the market is relieved over the fact that it appears that new cases of the coronavirus seem to be dwindling," said Peter Cardillo, chief market economist at Spartan Capital Securities in New York.
The outbreak has spooked investors amid quarantines, supply-chain disruptions and factory shutdowns, and the World Health Organization (WHO) warned that the apparent slowdown in the epidemic's spread should be viewed with "extreme caution."
Market participants paid heed to U.S. Federal Reserve Chair Jerome Powell as he wrapped up his semiannual economic report before Congress, during which he said the central bank was closely monitoring the coronavirus and other threats.
"Chairman Powell stuck to his script, and that was also good news for the market," Cardillo added. "(He) reassured the market that the Fed is there, willing and ready, if need be, to stimulate the economy."
Indeed, Powell reiterated his confidence in the sustainability of the current U.S. economic expansion, now in its 11th year.
The Dow Jones Industrial Average rose 274.46 points, or 0.94%, to 29,550.8, the S&P 500 gained 21.63 points, or 0.64%, to 3,379.38 and the Nasdaq Composite added 87.02 points, or 0.9%, to 9,725.96.
Of the 11 major sectors in the S&P 500, all but consumer staples ended the session in the black, with energy , technology and consumer discretionary posting the largest percentage gains.
Fourth-quarter reporting season is over the hump, with 351 companies in the S&P 500 having posted results. Of those, 70.9% have surprised analyst expectations to the upside, according to Refinitiv data.
Aggregate fourth-quarter earnings are now seen growing at an annual rate of 2.4%, a turnaround from the 0.3% year-on-year decrease forecast on Jan 1.
Lyft Inc lost 10.2% after the ride-hailing company forecast slower revenue growth in 2020.
Micron Technology Inc advanced 3.5% after UBS upgraded the chipmaker's shares to "buy."
The broader Philadelphia SE Semiconductor index gained 1.4%.
Advancing issues outnumbered declining ones on the NYSE by a 1.69-to-1 ratio; on Nasdaq, a 1.67-to-1 ratio favored advancers.
The S&P 500 posted 71 new 52-week highs and two new lows; the Nasdaq Composite recorded 137 new highs and 50 new lows.
Volume on U.S. exchanges was 7.40 billion shares, compared with the 7.66 billion-share average over the last 20 trading days. (Reporting by Stephen Culp; editing by Jonathan Oatis)