US STOCKS-S&P, Nasdaq dip as Powell warns on economic recovery

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* Powell says economic recovery far from complete
* Fiscal stimulus talks to continue on Tuesday
* BioNTech jumps on rolling EU review of vaccine candidate
* Indexes: Dow up 0.13%, S&P off 0.15%, Nasdaq down 0.55%

(Adds comments; updates prices)
By Devik Jain
Oct 6 (Reuters) - The S&P 500 and the Nasdaq retreated on
Tuesday as Federal Reserve Chair Jerome Powell warned the U.S.
economic recovery remained far from complete, with a selloff in
some of the biggest technology companies also weighing on
sentiment.
The domestic rebound could still slip into a downward spiral
if the coronavirus is not effectively controlled and growth
sustained, Powell said, in a call for more help to businesses
and households. "Markets are worried about what the Fed knows that we don't
know," said John Augustine, chief investment officer at
Huntington National Bank in Columbus, Ohio.
"The things that are obvious to us are that small businesses
are closing and unemployment remains high in the services
sector. The Fed aggressively wants to address both of those with
more fiscal stimulus."
Comments from officials that a stimulus deal was still
possible had lifted the three main stock indexes on Monday,
helping them recoup losses from last week that were sparked by
news that President Donald Trump had contracted COVID-19.
Trump returned to the White House on Monday from the Walter
Reed Medical Center military hospital, but faced fresh backlash
for removing his mask upon his return and urging Americans not
to fear the disease that has killed more than 209,000 in the
United States. House Speaker Nancy Pelosi and Treasury Secretary Steven
Mnuchin spoke by phone on Monday about fresh relief measures and
were preparing to talk again on Tuesday. Seven of the 11 major S&P sectors were up, with gains led by
the battered energy sector .SPNY .
A rotation into value-linked sectors .IVX such as
industrials .SPLRCI also boosted the blue-chip Dow, but the
Nasdaq slipped further away from record highs following a dip in
shares of heavyweight technology mega-caps.
Amazon.com Inc AMZN.O , Apple Inc AAPL.O , Facebook Inc
FB.O and Google-owner Alphabet Inc GOOGL.O fell between 0.8%
and 2.2% as reports said a U.S. House of Representatives'
antitrust report contains a "thinly veiled call to break up" the
companies. At 11:29 a.m. ET, the Dow Jones Industrial Average .DJI
was up 35.20 points, or 0.13%, at 28,183.84, the S&P 500 .SPX
was down 5.19 points, or 0.15%, at 3,403.44, and the Nasdaq
Composite .IXIC was down 62.46 points, or 0.55%, at 11,270.03.
Boeing Co BA.N fell 2.8% after the planemaker cut its
rolling 20-year forecast for airplane demand due to the fallout
from the COVID-19 pandemic. U.S.-listed shares of BioNTech BNTX.O jumped 6.3% after
the European health regulator said it had started a real-time
review of the COVID-19 vaccine being developed by the German
biotech firm and U.S. drugmaker Pfizer Inc PFE.N . Pfizer's
shares dipped 0.1%. Shares of audio device makers Sonos Inc SONO.O and
Logitech LOGN.S fell 5.2% and 4.7%, respectively, after their
speakers were removed from Apple's online stores. Advancing issues outnumbered decliners by a 2.18-to-1 ratio
on the NYSE and by a 1.96-to-1 ratio on the Nasdaq.
The S&P index recorded 24 new 52-week highs and no new low,
while the Nasdaq recorded 93 new highs and seven new lows.