By Alexandra Scaggs 

U.S. stocks rallied Thursday, as a rebound in oil prices and upbeat company news helped push benchmarks back into positive territory for the year.

The Dow Jones Industrial Average rose 211.86 points, or 1.2%, to 17884.88, now up 0.3% for 2015. It closed with a yearly gain for the first time since Jan. 8.

The S&P 500 gained 21.01 points, or 1%, to 2062.52, giving it a 0.2% yearly gain. The Nasdaq Composite Index added 48.39 points, or 1%, to 4765.10.

Rising crude-oil prices fueled gains in materials and energy stocks. A monthslong commodity-price decline has recently fueled worries about global economic growth. And while oil prices remain volatile, a 14% rebound from their recent lows has assuaged some of those fears, strategists say.

On Thursday, U.S. crude-oil futures rose 4.2% to settle at $50.48 a barrel. Materials shares led the S&P 500 higher, with a gain of 2.4%. Energy stocks outperformed the broader index, rising 1.4%.

Commodities "have some sort of price stability... [which shows] global fears of a slowdown are somewhat overblown," said Jeff Yu, head of single-stock derivatives trading at UBS AG. A "very broad" range of investors were buying stocks Thursday, he added.

Health-care stocks in the S&P 500 rallied 1.6% after Pfizer agreed to buy Hospira Inc., which makes injectable drugs and infusion technologies. Hospira shareholders will receive $90 a share in cash, representing a premium of 39% to Wednesday's closing price. Shares of Pfizer rose 2.9% and Hospira surged 35%.

"Today re-emphasizes the growing confidence that companies have" to carry out deals, said Sean Lynch, co-head of global equity strategy at Wells Fargo Investment Institute. "You're seeing companies do some things to reward equity shareholders... the corporate sector is in a good position here." Because of that, the bank is bullish on large-cap U.S. stocks, he said.

E.I. DuPont de Nemours and Co. was the best performer in the Dow, rallying 3.1% after it named two new directors to its board in a revamp. It excluded candidates nominated by activist investor Nelson Peltz's Trian Fund Management Corp.

The bullish mood was also supported by improving fourth-quarter corporate earnings. With 309 companies in the S&P 500 having now reported, earnings were recently on pace to grow 3.5% from last year, according to FactSet, above initial forecasts for 1.1% of growth. Results have improved in recent days, bolstered by a blowout report from Apple Inc. And even without Apple, earnings are now on track to grow 1.7% from last year. Just last week, profits were on pace to shrink 0.5% excluding the tech giant.

Earnings season "started atrociously...but overall, earnings are pretty good," said Dan Greenhaus, chief global strategist at New York brokerage firm BTIG.

Thursday's stock gains follow a string of swings earlier this month. Stock-market volatility has picked up this year, driven in part by sharp moves in energy and currency markets. Driving the swings has been uncertainty about the impact of an expected interest-rate increase from the Federal Reserve, concerns about Greece and worries about global growth.

But U.S. shares shrugged off rising tensions in negotiations between Greece and its creditors on Thursday, though benchmarks took a hit from the news during Wednesday's session. That day, the Dow gave up a gain of 116 points to end little changed after the European Central Bank said it would stop accepting Greek bonds as collateral for regular central bank loans. Greece's new leaders are seeking to ease conditions on its bailout program.

The ECB's announcement, which was released after the close of European markets, weighed on Greek stocks and bonds Thursday. Germany's DAX slipped 0.1%, while Greece's Athex Composite fell 3.4%.

Federal Reserve Bank of Boston President Eric Rosengren suggested Thursday that the dollar's rally has complicated the Fed's efforts to get annual consumer-price growth back to target.

Investors also considered better-than-expected data on the labor market. Jobless claims in the week ended Jan. 31 rose by 11,000 to 278,000, the Labor Department said Thursday. Economists polled by The Wall Street Journal had expected 290,000 new claims.

On Friday, the closely watched nonfarm payrolls report is expected to show the economy added 237,000 jobs in January, as the unemployment rate ticked down to 5.5% from 5.6%.

In Asia, China's Shanghai Composite Index fell 1.2% and Japan's Nikkei Stock Average declined 1%, despite introduction of a new stimulus measure from the People's Bank of China.

Gold futures slipped 0.1% to settle at $1272.00 an ounce.

Treasury prices fell, pushing the yield on the 10-year Treasury note up to 1.815% from 1.794% Wednesday.

Verizon Communications Inc. confirmed plans to sell a package of wireline assets to Frontier Communications Corp. for around $10 billion. Shares of Verizon rose 0.1%, while those of Frontier jumped 5.8%.

Anthem Inc., the second-biggest health insurer in the U.S., fell 0.3% after it said hackers broke into a database containing personal information for about 80 million customers and employees.

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

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