By Polya Lesova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks dropped on Friday after a report showed the U.S. economy expanded at a slower pace in the first quarter than expected and a gauge of consumer sentiment declined in April.

The S&P 500 index (SPX) fell 2.43 points, or 0.2%, to 1,582.70 in afternoon trade, with consumer staples the top gainer among its 10 major industry groups. Materials was the worst performing sector.

Despite Friday's pullback, the S&P 500 index was on track to end the week with gains of 1.8%.

"What's happening today is a little bit of jitters on the economic front and a little bit of jitters on the earnings front," said Adam Sarhan, chief executive of Sarhan Capital.

Investors are also growing more concerned over a steeper-than-expected downturn in Europe given recent data, he said.

More than 325 million shares traded on the New York Stock Exchange by 2 p.m. Eastern. Composite volume topped 1.9 billion.

The technology-heavy Nasdaq Composite index (RIXF) shed 10.52 points, or 0.3%, to 3,279.15.

The Dow Jones Industrial Average (DJI) fluctuated between small gains and losses. The Dow was last up 20 points to 14,720, with Hewlett-Packard Co. (HPQ) up 3.2%, leading gainers in the 30-stock blue-chip index.

Chevron Corp.(CVX) was another gainer in the Dow, rising 1.2%. The oil major said its first-quarter earnings fell to $6.2 billion, or $3.18 per share, from $6.5 billion, or $3.27 a share, in the same period a year ago, but the results still exceeded analyst expectations.

3M Co. (MMM) and American Express Co. (AXP) were the biggest decliners in the Dow, dropping 1% and 0.7%, respectively.

The Commerce Department said before the opening bell that gross domestic product grew at a 2.5% pace in the first three months of 2013, up from 0.4% in the fourth quarter. Economists surveyed by MarketWatch had forecast GDP growth of 3.2%. See: Breaking down the GDP report in charts.

"The disappointment will push back expectations of when the Fed will start to withdraw its stimulus, especially as recent data suggest the rate of growth could weaken again in the second quarter," said Chris Williamson, chief economist at Markit, referring to the Federal Reserve's bond-buying program, which is aimed at boosting economic growth and lowering unemployment. The Federal Open Market Committee is due to hold a meeting on monetary policy on Tuesday and Wednesday, and it's expected to keep its bond buying unchanged at $85 billion a month.

Shortly after Friday's opening bell, the University of Michigan-Thomson Reuters consumer-sentiment gauge fell to a final April reading of 76.4, the lowest since January, from a final March reading of 78.6. Economists had expected it to be even lower.

Among individual stock moves, PerkinElmer Inc. (PKI) was the top decliner in the S&P 500, dropping 12% after the maker of health-testing equipment lowered its full-year outlook.

Expedia Inc. shares (EXPE) slumped more than 10% after the online travel site said its first-quarter loss widened.

Shares of Amazon.com Inc.(AMZN) fell 7% as the e-commerce group said late Thursday it may report a second-quarter operating loss.

J.C. Penney Co.(JCP) rallied nearly 9%, making it the top gainer in the S&P 500 after hedge-fund investor George Soros reported a 7.9% stake in the struggling retailer.

D.R. Horton Inc.(DHI) shares jumped 7.3% after the company posted a surge in fiscal second-quarter profit and a 34% rise in orders.

Sarhan Capital's Sarhan noted that 70% of companies that have reported so far have beaten expectations, and earnings are on track to come in 1.1% lower versus the first quarter of 2012.

"If that happens, it'll be the first annual decline on a year-on-year basis since 2009," he said.

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