Wall Street closes rollercoaster week sharply lower



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* Nasdaq leads losses as technology majors sink

* S&P 500 ends below 50-day moving average

* Triple options expiry causes late session volume spike

* Indexes post weekly losses

* Indexes down: Dow 0.48%, S&P 0.91%, Nasdaq 0.91% (Updates with closing prices)

By Stephen Culp

NEW YORK, Sept 17 (Reuters) - U.S. stocks ended sharply lower in a broad sell-off on Friday, ending a week buffeted by strong economic data, corporate tax hike worries, the Delta COVID variant, and possible shifts in the U.S. Federal Reserve's timeline for tapering asset purchases.

All three major U.S. stock indexes lost ground, with the Nasdaq Composite Index's .IXIC weighed down as rising U.S. Treasury yields pressured market-leading growth stocks.

They also posted weekly losses, with the S&P index .SPX suffering its biggest two-week drop since February.

"The market is struggling with prospects for tighter fiscal policy due to tax increases, and tighter monetary policy due to Fed tapering," said David Carter, chief investment officer at Lenox Wealth Advisors in New York.

"Equity markets are also a little softer due to today's weak Consumer Sentiment data," Carter added. "It's triggering concerns that the Delta variant could slow economic growth."

A potential hike in corporate taxes could eat into earnings also weigh on markets, with leading Democrats seeking to raise the top tax rate on corporations to 26.5% from the current 21%.

While consumer sentiment steadied this month it remains depressed, according to a University of Michigan report, as Americans postpone purchases while inflation remains high.

Inflation is likely to be a major issue next week, when the Federal Open Markets Committee holds its two-day monetary policy meeting. Market participants will be watching closely for changes in nuance which could signal a shift in the Fed's tapering timeline.

"It has been a week of mixed economic data and we are focused clearly on what will come out of the Fed meeting next week," said Bill Northey, senior investment director at U.S. Bank Wealth Management in Helena, Montana.

The Dow Jones Industrial Average .DJI fell 166.44 points, or 0.48%, to 34,584.88; the S&P 500 .SPX lost 40.76 points, or 0.91%, at 4,432.99; and the Nasdaq Composite .IXIC dropped 137.96 points, or 0.91%, to 15,043.97.

The S&P 500 ended below its 50-day moving average, which in recent history has proven a rather sturdy support level.

Of the 11 major sectors in the S&P 500, all but healthcare .SPXHC ended in the red, with materials .SPLRCM and utilities .SPLRCU suffering the biggest percentage drops.

COVID vaccine manufacturers Pfizer Inc PFE.N and Moderna Inc MRNA.O dropped 1.3% and 2.4%, respectively, as U.S. health officials moved the debate over booster doses to a panel of independent experts.

U.S. Steel Corp X.N shed 8.0% after it unveiled a $3 billion mini-mill investment plan.

Robinhood Markets Inc HOOD.O rose 1.0% after Cathie Wood's ARK Invest bought $14.7 million worth of shares in the trading platform.

Volume and volatility spiked toward the end of the session due to "triple witching," which is the quarterly, simultaneous expiration of stock options, stock index futures, and stock index options contracts.

Volume on U.S. exchanges was 15.51 billion shares, compared with the 9.70 billion average over the last 20 trading days.

Declining issues outnumbered advancing ones on the NYSE by a 1.97-to-1 ratio; on Nasdaq, a 1.00-to-1 ratio favored advancers.

The S&P 500 posted seven new 52-week highs and two new lows; the Nasdaq Composite recorded 67 new highs and 82 new lows.



S&P 500 flirts with 50-day moving average Link



Reporting by Stephen Culp; Additional reporting by Krystal Hu
in New York and Ambar Warrick in Bengaluru; Editing by Richard
Chang

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