By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- The U.S. stock market fluctuates in early trade on Wednesday as investors listened to Federal Reserve Chairwoman Janet Yellen's testimony in front of the Joint Economic Committee of Congress.

Selling of high-growth Internet stocks resumed in earnest, resulting in sharp losses for the Nasdaq Composite.

The S&P 500 (SPX) were a point lower at 1,866.59. The Dow Jones Industrial Average (DJI) regained poise and added 14 points, or 0.1%, to 16,414.44.

The Nasdaq Composite(RIXF) sold off, falling 42 points, or 1%, to 4,037.85.

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Commenting on volatile trading, Paul Mangus, head of equity research and strategy at Wells Fargo Private Bank, said now that the earnings season is almost over markets are sensitive to macro news.

"We have seen a change in sentiment among investors, a shift from momentum stocks whose earnings disappointed and no longer justify lofty valuations," he added.

A report ahead of the opening bell showed that slower economic growth caused in part by brutal winter weather led to a sharp decline in U.S. productivity in the first quarter.

The productivity of American businesses fell at a 1.7% annual rate from January through March, the Labor Department said Wednesday. It was more than expected by economists polled by MarketWatch.

Yahoo shares lower, Electronic Arts rallies

Shares of Yahoo Inc. (YHOO) fell 6.3% after Chinese Internet heavyweight Alibaba Group Holding Ltd. filed plans to list shares in the U.S.

Yahoo has a 24% stake in Alibaba, and its initial public offering is poised to be one of the biggest listings on record. Read: Yahoo's Alibaba moment has finally arrived.

Electronic Arts Inc. shares (EA) rallied 16%. Late Tuesday, the videogame maker reported fourth-quarter results that outstripped Wall Street's projections.

Shares in Whole Foods Market Inc. (WFM) dived 19%, still suffering after the upscale grocer late Tuesday cut its full-year profit and sales forecasts.

AOL Inc. (AOL) shares plummeted 22% after the Internet company's first-quarter profit dropped more than 60%, hurt by restructuring and asset impairment charges, even as revenue topped expectations.

After the closing bell, Tesla Motors Inc. (TSLA) will release quarterly results. Tesla is expected to report first-quarter earnings of 8 cents a share, according to a consensus survey by FactSet. Tesla earnings: Balancing goals and costs

Also due after hours are results from coffee company Keurig Green Mountain Inc. (GMCR), which is projected to post fiscal second-quarter earnings of 95 cents a share.

Gold prices fall, oil rises

European markets edged higher, while Asian stock markets closed lower. Russia's Micex index rallied 3.6%, after president Putin said he was ready to talk over the crisis in Ukraine.

The U.S. dollar (DXY) was little changed against major rivals, taking a slight breather after losses on Tuesday against the pound. The pound (GBPUSD) traded near highs last seen in 2009, on the doorstep of the $1.70 level.

Among commodities, June gold (GCM4) prices reversed gains and fell $12, or 0.9%, to $1.296.9 an ounce. Crude for June delivery (CLM4) rose $1.17, or 1.2%, to $100.68.

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