By Dan Strumpf 

Stocks posted modest gains Monday, as investors treaded carefully following last week's rally and looked ahead to a number of corporate earnings reports this week.

The Dow Jones Industrial Average rose 42 points, or 0.3%, to 16451 in afternoon trading. The S&P 500 index gained six points, or 0.3%, to 1871. The Nasdaq Composite Index added 23 points, or 0.6%, to 4118.

Monday was marked by light trading activity, traders said, with European markets closed and little in the way of economic data and corporate earnings reports. Many investors said they were looking ahead to earnings updates due later in the week for additional cues on stocks' direction.

Among the market's biggest gainers were companies rocked by the recent selloff in the biotechnology, social-media and other high-growth sectors. Shares of Facebook gained 3.6%, while Twitter rallied 2.6% and the Nasdaq Biotechnology index tacked on 2%.

Dan Veru, chief investment officer at Palisade Capital Management, which oversees about $5 billion in assets, said he expects investors to be pickier in deciding which high-growth stocks to reward, adding he is focused on owning those with growing businesses. "All these stocks went up together and they go down together," he said. "You're going to see a separation."

Trading volumes Monday were on track to be the lightest all year, according to Jonathan Krinsky, chief market technician at MKM Partners.

"People are focused on earnings later this week, but the big story today is the very light volumes," said Bill Nichols, head of U.S. equities at brokerage Cantor Fitzgerald, adding that the Patriots' Day holiday in Massachusetts was keeping many big investors in the Boston asset-management community at home.

Investors were awaiting a number of updates from American corporations this week, though analysts aren't expecting a blowout quarter. So far, 17.6% of companies in the S&P 500 have reported quarterly earnings, according to FactSet. Analysts have cut their expectations considerably in recent months, and profits are expected to decline 1.5% in the quarter, according to FactSet, after the harsh winter curbed economic activity.

Among major earnings reports expected this week, four Dow components--Travelers, McDonald's, United Technologies and AT&T--are due to report Tuesday.

Charlie Smith, co-founder of Fort Pitt Capital Group, which manages about $1.7 billion out of Pittsburgh, said he is digging deeper into corporate earnings reports this quarter in search of companies with stronger financials and is giving more weight to names that show genuine growth.

"The bar's been lowered enough where just about everybody can step right over it now," he said. "Our theme for this year is trying to tease out where real growth is." Mr. Smith said he is invested in certain companies in the aerospace and semiconductor sectors that are boosting sales.

Although stocks have seen more turbulence this year following last year's 30% gain in the S&P 500, most major indexes remain close to record highs. Many highflying growth stocks in the technology sector have been hammered in recent weeks, but the S&P 500 index is up 1.1% so far this year and is just 1.2% from its record high of 1890.90 reached April 2.

On Thursday, the Dow slipped 16 points, or 0.1%, to snap a three-session win streak but still capped the biggest weekly point and percentage gain since the week ending Dec. 20. Meanwhile, the S&P 500 and Nasdaq Composite Index rose in all four sessions last week. The S&P 500 rose in all four trading days last week, posting its biggest weekly percentage gain since the week ending July 12.

The stock market was closed Friday for the Good Friday holiday.

The yield on the 10-year Treasury note slipped to 2.719%, from 2.721% late Thursday.

Gold futures fell 0.7% to $1,283.80 an ounce, after settling Thursday at a two-week low. Crude-oil futures rose 0.1% to $104.37 a barrel. The dollar edged up against the yen and the euro.

In corporate news, Advanced Micro Devices surged 12.2% after the semiconductor maker late Thursday reported first-quarter adjusted earnings and revenue that exceeded expectations and provided an upbeat sales-growth outlook for the current quarter.

Netflix rose 0.6%, ahead of the video-streaming services company's first-quarter results due out after the close. Netflix's stock has swung widely in recent weeks as investors have pulled out of many high-growth technology stocks on concerns over valuations. Shares bounced 5.8% last week after falling 27% over the previous six weeks. The stock had run up nearly fourfold in 2013.

Oil-field-services company Halliburton rose 3.2% after reporting first-quarter earnings and revenue that topped analysts' estimates.

Hasbro reported better-than-expected first-quarter adjusted earnings amid strong sales of girls' products and improving gross margin, although revenue fell short of estimates. The toy maker's stock rose 1.3%.

Asian markets were mostly lower. China's Shanghai Composite slid 1.5% amid share supply concerns, after the China Securities Regulatory Commission disclosed late Friday a list of 28 companies planning initial public offerings.

Write to Dan Strumpf at daniel.strumpf@wsj.com

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