By Alexandra Scaggs 

U.S. stocks slipped in choppy trading Thursday, as a pair of disappointing bank earnings reports weighed down financial shares.

The Dow Jones Industrial Average fell 47 points, or 0.3%, to 17379. The S&P 500 lost eight points, or 0.4%, to 2003 and the Nasdaq Composite Index dropped 34 points, or 0.7% to 4604.

A recent wave of volatile trading continued Thursday, as major U.S. stock benchmarks swung between gains and losses before noon. Investors have been watching U.S. corporate earnings reports and moves in global commodity and bond markets to get a read on economic growth. They fret that a continuing slide in oil and metals prices, paired with a rally in government bond prices, is signaling slowing global growth.

"There are these disconnects" in asset prices, said Michael O'Rourke, chief market strategist at JonesTrading. "And they eventually have to right themselves...either stocks have to go down or bonds have to go down."

The financial sector of the S&P 500 lagged behind the broader index, recently down 0.8%, after two major U.S. banks reported results that fell short of Wall Street's forecasts.

Bank of America Corp. fell 3.2% after it said its fourth-quarter profit fell 11%, hurt by lower trading revenue. Results missed expectations.

Citigroup Inc. fell 2.4% after it said its fourth-quarter profit plunged 86% from a year earlier, weighed down by a massive legal charge and disappointing trading revenue.

"Earnings season is already not off to a good start," said Mr. O'Rourke. More disappointing reports could be a problem, he said, since stocks are trading above long-term average valuations. The S&P 500 is trading at 16.7 times its earnings from the last 12 months, according to FactSet, above its 10-year average of 14.6.

Elsewhere, retailer Best Buy Co. slumped 13% after the company warned it will boost spending on efforts to fuel growth, which should start pressuring earnings next quarter.

Crude-oil futures fell, after an early jump helped support a stock-market advance at the start of trading. Crude-oil futures were recently down 1.2% at $47.91 a barrel. Oil has lost more than 50% since last June, which has investors worried about global growth.

Investments seen as defensive bets rose. Utilities and consumer-staples stocks outperformed broader indexes. And Treasury prices climbed, pushing the yield on the 10-year note down to 1.794% from 1.833% on Wednesday. The recent decline in the yield on the 10-year note has surprised some investors, since most expect the Federal Reserve to raise short-term interest rates this year. The price of gold, also seen as a safe-haven asset, rose 2.2% to $1261.50.

Many investors believe stocks can continue to rise in 2015, but say the path up will be bumpier. That has prompted Danilo Kawasaki, co-founder of Gerber Kawasaki Wealth & Investment Management, to sell some technology and biotech stocks in recent months. Both sectors have outperformed broader markets over the past year and are seen as riskier.

"We feared that January would be volatile," said Mr. Kawasaki, whose firm manages about $300 million. He is putting that cash into Treasurys, bond funds and annuities, he said.

"It's very tricky right now," he said. "The stock market is hitting all-time highs, and the bond market is at a point where we could see rates go up and prices get hammered, so we have to be very tactical."

Thursday's turbulence follows multiple intraday swings this month, amid a continuing rise in volatility. The CBOE Volatility Index, which measures expectations for swings in the S&P 500, has closed above its 10-year average of 20 for two sessions in a row, as of Wednesday. It rose further Thursday, climbing 3.2% to 22.16.

In other economic news, data showed that U.S. inflation fell by less than expected. The producer price-index fell 0.3% in December from a month earlier, the Labor Department said. The index measures the prices firms get for their goods and services. Excluding food and energy, prices rose 0.3%. Economists surveyed by The Wall Street Journal had expected overall prices to fall 0.4% and prices excluding food and energy to climb 0.1%.

Earlier, markets were rattled after Switzerland's central bank scrapped its policy of capping the Swiss franc at 1.20 to the euro. The Swiss National Bank has intervened in markets since September 2011. In the wake of the SNB's move, the euro dropped as low as 0.93 francs.

Still, European stocks rose broadly, with the Stoxx Europe 600 up 2.4%. Germany's DAX Index rose 2%, France's CAC 40 gained 2.1% and Italy's FTSE MIB rallied 2.4%.

Write to Alexandra Scaggs at alexandra.scaggs@wsj.com

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