By Saumya Vaishampayan And Corrie Driebusch 

U.S. stocks were little changed Tuesday after a mixed bag of earnings reports.

The Dow Jones Industrial Average climbed 15 points, or 0.1%, to 18050 and the S&P 500 index rose five points, or 0.2%, to 2105. The Nasdaq Composite added 27 points, or 0.5%, to 5022.

United Technologies Corp. said its sales fell about 1% in the first quarter due to the strengthening dollar and a decline in its Sikorsky aircraft segment. Earnings beat Wall Street expectations, though revenue fell short. Shares rose 1.4%, making it the biggest gainer in the Dow.

DuPont Co. said the strengthening U.S. dollar will hurt its earnings for the year more than it estimated in January, though it still expects earnings to come in at the low end of its guidance of $4 to $4.20 a share as it intensifies cost cuts. The company also reported sales declines across all of its segments. Shares declined 2.3%, making it the worst performer in the Dow.

International Business Machines Corp. on Monday reported a 12% decrease in revenue, hurt by the stronger U.S. dollar and weakness in its hardware business. Shares slipped 0.2%.

On Monday, U.S. stocks snapped two straight sessions of declines. The Dow rose 1.2% to 18034.93 and the S&P added 0.9% to 2100.40. The Nasdaq Composite gained 1.3% to 4994.60.

Better-than-expected earnings are contributing to the rise in stock prices. Including results from 77 companies, first-quarter earnings for S&P 500 companies are on track to fall 4.2% from a year ago, according to FactSet. Analysts had slashed earnings estimates leading up to the reporting season, citing concerns about the strong dollar's drag on earnings at multinational companies and the hit to energy earnings from low oil prices. About 79% of the S&P 500 companies that have reported so far have beat those lowered earnings estimates.

"We don't anticipate any big surprises out of earnings," said Janet Engels, director of the portfolio advisory group at RBC Wealth Management.

"We do expect earnings will beat the current expectations, but that's been the history," she said. "I'm not sure that it is in the very near term enough to drive the market wildly higher," she added.

In Europe, France's CAC 40 added 0.6% and Germany's DAX gained 1.2%. Continued concerns about a Greek debt default pushed Greek yields to fresh multiyear highs and weighed on Greek stocks. Bond yields rise as prices fall.

The euro fell to $1.0693 from $1.0739 on Monday.

In other corporate news, shares of Mylan NV surged 8.4% after rival Teva Pharmaceutical Industries Ltd. proposed to acquire the company for about $40 billion in cash and stock, a tie-up that would create the world's biggest generic drug company by sales.

In commodity markets, gold futures rose 0.2% to $1196.00 an ounce. Crude-oil futures slipped 0.3% to $57.73 a barrel.

Treasury prices rose, pushing the 10-year yield down to 1.891% from 1.897% on Monday.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com and Corrie Driebusch at corrie.driebusch@wsj.com

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