By Kate Gibson, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks fell on Friday, with the market still on track for its third week of gains, as investors reacted to the uncertain science of reading verbal signals from U.S. central bankers.

The Dow Jones Industrial Average and the S&P 500 both fell for a second session, retreating from the record heights that came Wednesday after the Federal Reserve unexpectedly said it would refrain from curbing stimulus for now. On Monday, stocks rallied in the wake of Larry Summers deciding to pull his name out of contention to replace Ben Bernanke as chairman of the Federal Reserve.

The final trading session of the week had one Federal Open Market Committee member signaling the Fed could curb stimulus next month and another was critical of the decision not to taper in September.

It has been a "big week if you're a Fed watcher, between Larry Summers and the FOMC meeting, the market was caught off guard," said Richard Slinn, co-head of investments for Northern California, J.P. Morgan Private Bank. The bank manages $910 billion in assets.

The Fed's unexpected decision to hold off on reducing its $85 billion in monthly asset purchases was "aimed more at Main Street than Wall Street," said Slinn, adding that the Fed wants to ensure its "decisions don't risk the nascent recovery in the private sector," given the potential impact of rising interest rates on housing and the auto sectors.

The Dow Jones Industrial Average (DJI) 108.32 points, or 0.7%, to 15,528.15, with aluminum-producer Alcoa Inc. (AA) among the top three decliners among its 30 components, its shares down 1.7% on its final day of trading as a blue chip.

Alcoa, Hewlett-Packard Co. (HPQ) and Bank of America Corp. (BAC) will no longer be part of the Dow 30 when trading begins Monday, replaced by Goldman Sachs Group Inc.(GS), Visa Inc. (V) and Nike Inc. (NKE).

Another Dow component, Caterpillar Inc. (CAT), fell 2.3% after the heavy-equipment maker in a regulatory filing reported a decline in retail sales.

The S&P 500 index (SPX) dropped 9.38 points, or 0.5%, to 1,712.96, with telecommunications losing the most and health care the best performing of its 10 major sectors.

The Nasdaq Composite (RIXF) shed 8.41 points, or 0.2%, to 3,780.96.

Apple Inc. (AAPL) shares fell 0.5% as long lines formed at the iPhone maker's retail stores around the globe, with the latest models of its handsets on sale, starting Friday.

AK Steel Holding Corp. (AKS) declined 7.9% after forecasting a fourth-quarter loss.

For every stock rising, nearly three declined on the New York Stock Exchange, where 642 million shares traded as of 1:45 p.m. Eastern.

Composite volume approached 2.2 billion.

Interviewed Friday on Bloomberg Television, Federal Reserve Bank of St. Louis President James Bullard said the decision not to begin tapering followed weaker economic data, and that a small taper could start in October. Stock futures fell after he spoke. Read about what some Fed watchers think.

In prepared comments for delivery at a business luncheon in New York, Bullard said tapering is more likely if the labor market continues to improve.

Kansas City Fed President Esther George on Friday said markets were ready for reduced stimulus to begin, and the central bank's failure to follow through on expectations hurt its credibility on Wall Street.

Crude-oil futures(CLV3) lost 74 cents, or 0.7%, to $105.65 a barrel and gold futures dropped $35.10, or 2.6%, at $1,334 an ounce on the New York Mercantile Exchange.

The dollar (DXY) gained against the currencies of U.S. trading partners, including the euro (EURUSD) but excluding the yen (USDJPY)

Treasury prices held steady, with the yield on the benchmark 10-year note (10_YEAR) down 3 basis points at 2.725%.

A day after rallying to records on the FOMC decision not to taper, U.S. stocks mostly fell Thursday in a consolidation of the prior day's gains.

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