By Alexandra Scaggs 

U.S. stocks fell on Thursday afternoon, as a pair of disappointing bank earnings reports weighed down financial shares.

The Dow Jones Industrial Average declined 81 points, or 0.5%, to 17345.

The S&P 500 lost 14 points, or 0.7%, to 1997 and the Nasdaq Composite Index dropped 59 points, or 1.3% to 4581.

Corporate earnings were a main focus Thursday, traders said. The financial sector of the S&P 500 lagged behind the broader index, recently down 1.1%, after two major U.S. banks reported results that fell short of Wall Street's forecasts.

"[Investors] are looking at the valuations of certain sectors and stocks, and saying it's time to rotate into safer names," said Brian Fenske, head of sales trading at brokerage ITG in New York.

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.

Bank of America Corp. fell 4.7% after the bank said its fourth-quarter profit fell 11%, hurt by lower trading revenue. Results missed expectations.

Citigroup Inc. fell 3.6% after it said its fourth-quarter profit plunged 86% from a year earlier, weighed down by a massive legal charge and disappointing trading revenue.

Retailer Best Buy Co. slumped 11% after the company warned it will boost spending on efforts to fuel growth, which should start pressuring earnings next quarter.

Investors have been watching 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 a global slowdown driven by Europe and Asia.

"There [are] a lot of crosscurrents right now that...are providing conflicting signals," said Matthew Fruhan, who manages the $3.2 billion Fidelity Large Cap Stock Fund. Those "create angst," he said.

Oil prices fell Thursday, after an early jump helped support a stock-market advance at the start of trading. U.S. crude-oil futures were recently down 4% at $46.56 a barrel, and have lost more than 50% since last June.

Mr. Fruhan said some companies' profits could be dented by the recent oil-price declines and gains in the U.S. dollar. But he is focusing mainly on their outlook for earnings over the long term. And while investors fret about European growth, he favors large multinational firms in the region, which sell to many of the same markets as U.S.-based firms, but trade at lower valuations.

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 1.774% from 1.833% on Wednesday. The recent decline in Treasury yields 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 2.1% to $1261.00. Shares of metals and mining companies rose 1.3%.

Major U.S. stock benchmarks swung between gains and losses in early trading, then turned lower. 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 6.8% to 22.93.

Many analysts say stocks should rise in 2015, but the path up will be bumpier. That expectation 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."

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 0.85 francs. It later rose to settle around 1.05, a loss of about 30%.

Still, European stocks rose broadly, with the Stoxx Europe 600 up 2.6%. Germany's DAX Index rose 2.2%, France's CAC 40 gained 2.4% and Italy's FTSE MIB rallied 2.4%.

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

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