By Saumya Vaishampayan 

U.S. stocks opened higher Monday, boosted by a handful of better-than-expected earnings reports and gains in European and Chinese shares.

The Dow Jones Industrial Average added 71 points, or 0.4%, to 18095. The S&P 500 gained nine points, or 0.4%, to 2117, and the Nasdaq Composite rose 23 points, or 0.5%, to 5028.

Action in the U.S. stock market has been choppy this year, as investors grapple with evidence of an economic slowdown at the start of the year, the strong dollar's drag on earnings and the possibility of higher interest rates.

The Dow fell in January, rallied in February, pulled back in March and eked out a gain in April. The blue-chip index has gained 1.1% for the year, through Friday's close. The S&P 500 has advanced 2.4% and the Nasdaq Composite is up 5.7% in the same period.

"We've been just waffling back and forth," said Chris Gaffney, president of EverBank World Markets.

Stocks rose Friday, but logged weekly losses in part due to soft economic data. The Dow gained 1% on Friday to 18024.06 and the S&P 500 added 1.1% to 2108.29.

Gains in European and Chinese stocks added to Monday's positive tone.

European stocks advanced after data showed the eurozone's manufacturing sector expanded in April, though at a slightly slower pace than in March. Germany's DAX gained 1.3% and France's CAC 40 rose 1%.

European stocks have outpaced their U.S. peers this year as the European Central Bank eases monetary policy in an attempt to jump-start economic growth. "In years past it was all about the U.S. equity market," said Mr. Gaffney of EverBank World Markets. "Now global investors are looking elsewhere, and that could be a drag on U.S. equities," he added.

Data showing a slowdown in Chinese manufacturing activity in April suggested Beijing may need to take further steps to bolster the economy, boosting stocks. The Shanghai Composite Index rose 0.9%.

U.S. economic reports this week will culminate with Friday's employment report, which is expected to show employers added 220,000 jobs last month as the unemployment rate ticked down to 5.4% from 5.5%.

On Monday, factory orders are expected to rise 1.9% in March, according to economists surveyed by The Wall Street Journal.

Investors also continued to watch first-quarter earnings. Including results from 372 companies in the S&P 500, earnings are on track to rise 0.1% in the first quarter. That compares with expectations of a 4.6% decline going into the reporting season. Sales are on track to fall 2.6%, in line with expectations.

Comcast Corp. reported better-than-expected profit and revenue growth in its first quarter, as its broadband division posted its strongest revenue growth in more than four years. The company also announced it will spend another $2.5 billion buying back shares this year. Shares rose 1%.

Tyson Foods Inc. said its profit rose 46% in the first three months of the year, topping expectations. Sales growth came in slightly below expectations as the company faced lower prices for pork and chicken. Shares rose 2.5%.

Sysco Corp. said its first-quarter profit fell 2% on higher food costs, currency effects and charges related to the company's pending acquisition of rival US Foods Inc. Excluding certain items, per-share earnings topped expectations while revenue fell short of estimates. Shares slipped 0.1%.

In other corporate news, McDonald's Corp. Chief Executive Steve Easterbrook unveiled his strategy to revive the struggling fast-food chain. He outlined plans to save $300 million a year by accelerating refranchising, restructuring under new segments and cutting down on bureaucracy. Shares fell 1%.

Cisco Systems Inc. said Chuck Robbins would be its next chief executive, effective July 26, replacing longtime leader John Chambers. Shares added 0.6%.

In commodity markets, gold futures rose 1.1% to $1187.40 an ounce. Crude-oil futures slipped 0.5% to $58.88 a barrel.

The yield on the 10-year Treasury note inched down to 2.096% from 2.119% on Friday. Yields fall as prices rise.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com

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