By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- The U.S. stock market extended losses Thursday, as investors found little solace from generally positive economic reports, sending the S&P 500 into negative territory for the year.

The fourth-quarter GDP was revised upward to 2.6%, slightly below the consensus of 2.8%. Weekly jobless claims fell by more than expected to the lowest level in four months.

A number of Fed officials are scheduled to speak.

The S&P 500 (SPX) fell 9 points, or 0.5%, to 1,842.94, falling below a key support level of 1,850. The benchmark index also turned lower for the year. The Dow Jones Industrial Average (DJI) dropped 67 points, or 0.4%, to 16,201.94.

The Nasdaq Composite (RIXF) shed 41 points, or 1%, to 4,132.04.

Follow MarketWatch's live blog of Thursday's stock-market action.

Investors shrugged off better-than-expected data on the strength of the economy. Government data showed that the economy's growth in the fourth quarter was bumped up to 2.6%, mainly because of higher health-care spending, while weekly unemployment benefits fell to the lowest level in four months, offering further evidence U.S. layoffs have slowed sharply and perhaps a hint that hiring is about to pick up.

Pending-home sales data for February will be released at 10 a.m. Eastern.

Among today's Fed officials scheduled to speak, Cleveland Fed president Sandra Pianalto spoke ahead of the market open.

In a speech at the University of Dayton Pianalto said "no single data point will determine how long the Federal Reserve can keep short-term interest rates low."

"We will be watching labor market conditions, indicators of inflation pressures and inflation expectations, and readings on financial developments. It is a complicated world out there," Pianalto said.

New York Fed President William Dudley will speak on lessons from "three decades of crises" in New York at 2:30 p.m. Eastern.

Later, Fed Gov. Daniel Tarullo will speak on foreign bank regulation at Harvard Law School in Cambridge, Mass. at 8:20 p.m. Eastern, and Chicago Fed President Charles Evans will speak in Hong Kong about U.S. economic policy at 9:30 p.m. Eastern.

Citigroup slumps after Fed rejects its capital plan

Citigroup (C) shares fell 4.6% after the bank failed to measure up to the Federal Reserve's stress-test requirements. Citi wasn't the only bank to be told late Wednesday that it needs to shore up its capital plans, but it was the biggest, and the news seemed to catch investors -- and the bank -- off guard.

Baxter International Inc. (BAX) shares rose 5.4% after the company said Thursday it plans to split into two entities, one focused on developing and marketing biopharmaceuticals and the other on medical products.

Lululemon(LULU) shares jumped 9.1% after posting a steady profit and higher revenue, but downside guidance.

GameStop (GME) shares fell 6.8% after the company reported quarterly results below consensus estimates.

Gold fall below $1,300; European stocks fall

In other markets, gold prices (GCJ4) fell below the key $1,300-an-ounce level ahead of GDP data, while oil (CLM4) pushed higher.

European stocks struggled and moved lower, while Asia saw a mixed day, with the Nikkei 225 index jumping 1% as the dollar (USDJPY) rose back above 102 yen. Media reports also pointed to reinvestment by a public pension fund for those Japan gains. The Shanghai Composite Index closed down 0.8%, which came amid reports the central bank has drained liquidity again.

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