By Saumya Vaishampayan And Alexandra Scaggs 

U.S. stocks opened higher on Thursday, as oil prices rebounded and Dow component Pfizer Inc. announced a $16 billion deal.

The Dow Jones Industrial Average rose 86 points, or 0.5%, to 17758. The S&P 500 gained 10 points, or 0.5%, to 2051 and Nasdaq Composite Index added 20 points, or 0.4%, to 4737.

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 2.7% and those of Hospira surged 35%.

Adding to the positive tone in the market was a rebound in U.S. oil prices. Crude-oil futures rose 2.6% to $49.77 a barrel.

The Dow ended little changed Wednesday, giving up a gain of 116 points in late-afternoon trade after the European Central Bank increased pressure on the new Greek government to come to terms with its international creditors. The Dow added less than 0.1% to 17673.02, while the S&P 500 fell 0.4% to 2041.51.

Stock-market volatility has picked up this year, driven in part by sharp swings in energy and currency markets. Uncertainty about the impact of an interest-rate increase from the Federal Reserve, concerns about Greece, signs of weakness in corporate earnings and worries about global growth have also contributed to swings in the stock market. In January, the S&P 500 had eight days in which it swung by at least 1%, more than the five times in January 2014. The Dow posted moves of 1% or more on 10 days in January, more than double the four such moves in January 2014.

"There is an uptick in global volatility," said John Brady, managing director at futures brokerage R.J. O'Brien. "It probably allows the Fed a little more time," he said, referring to an expected increase in interest rates.

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.

Stocks extended gains in early trading after labor-market data. 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%.

The ECB said Wednesday it would stop accepting Greek bonds as collateral for 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 fell 0.5% and France's CAC 40 lost 0.4%.

In Asian markets, China's Shanghai Composite Index fell 1.2% and Japan's Nikkei Stock Average declined 1%.

Gold futures fell 0.5% to $1258.40 an ounce. The yield on the 10-year Treasury note inched up to 1.798% from 1.794% Wednesday. Yields rise as prices fall.

Verizon Communications Inc. is close to selling a package of wireline assets to Frontier Communications Corp. for around $10 billion, The Wall Street Journal reported. Shares of Verizon slipped 0.1%, while those of Frontier jumped 5.4% in premarket trading.

Anthem Inc., the second-biggest health insurer in the U.S., said hackers broke into a database containing personal information for about 80 million customers and employees. Shares of the company gained 0.2%.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com and Alexandra Scaggs at alexandra.scaggs@wsj.com

Access Investor Kit for The Dow Chemical Co.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US2605431038

Access Investor Kit for Frontier Communications Corp.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US35906A1088

Access Investor Kit for Hospira, Inc.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US4410601003

Access Investor Kit for Pfizer Inc.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US7170811035

Access Investor Kit for Verizon Communications, Inc.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US92343V1044

Hospira (NYSE:HSP)
Gráfico Histórico do Ativo
De Jun 2024 até Jul 2024 Click aqui para mais gráficos Hospira.
Hospira (NYSE:HSP)
Gráfico Histórico do Ativo
De Jul 2023 até Jul 2024 Click aqui para mais gráficos Hospira.