By Dan Strumpf 

Stocks rebounded on Monday after a bigger-than-expected rise in March retail sales offered a sign that economic growth was on better footing following a difficult winter.

Investors, meanwhile, were encouraged by strong earnings from banking giant Citigroup.

The Dow Jones Industrial Average gained climbed 128 points, or 0.8%, to 16155. The S&P 500 index gained 17 points, or 0.9%, to 1832. The Nasdaq Composite Index advanced 45 points, or 1.1%, to 4045.

Stocks got a boost after the Commerce Department reported that retail sales rose 1.1% last month, the biggest monthly gain since September 2012 and exceeding the 0.8% expected by economists. Excluding auto sales, retail sales grew 0.7%, topping forecasts of a 0.4% rise. The strong increase suggests that sales are bouncing back after the cold winter kept many consumers at home earlier in the year.

"Things are a little bit better on the earnings front and a little bit better on the economic front," said Michael Arone, who heads portfolio strategy at State Street Global Advisors, which manages about $2.4 trillion. "Come off that spring thaw, we're seeing some good numbers."

Many highflying stocks that have been hit hard in recent weeks bounced back. The Nasdaq Biotechnology index gained 1.8% early in the session, though it still remains down 7.3% in April following heavy selling earlier in the month.

Facebook was up 1.1%, while Gilead Sciences rose 1.1%.

The early gain followed a sharp selloff last week, in which continued weakness in previously hot biotechnology and new-generation technology stocks put particular pressure on the Nasdaq Composite Index.

That selling, in which the Nasdaq Composite suffered the biggest weekly percentage loss last week since June 2012, started spilling over into larger, blue-chip stocks. The Dow Industrials ended last week with the biggest two-day decline in over two-months.

For the year, the Dow is down 2.7% after hitting an all-time high at the end of last year. The S&P 500 index is down 1.1%, while the Nasdaq is off 3.5%.

Despite the recent weakness, longer-term investors still believe the outlook for stocks is favorable, as the fundamentals that have helped push the market to new highs this year--such as an improving economy, low interest rates and inflation and an accommodative Federal Reserve--will eventually stem the selling.

Mr. Arone, who works with State Street's money managers in deciding how to invest in stocks and other assets, said he continues to recommend a bigger-than-usual holding of U.S. stocks. In particular, he is advising investors to stick with corners of the market that benefit from an improving economy, such as the technology and consumer discretionary sectors.

"As the spring rolls into summer, we're expecting some positive news on the earnings and economic front that we think will bolster equity prices, " he said.

Wayne Kaufman, chief market analyst at New York-based investment firm Rockwell Securities, said that while he remains bullish long-term, he recommends investors hold off on putting new money to work until the market shows it can respond to positive signals. "Unfortunately, just because stocks stop going down doesn't mean they are going up," Mr. Kaufman said.

The yield on the 10-year Treasury note ticked up to 2.642% from a seven-week low of 2.619% late Friday.

Crude oil futures slipped 0.1% to $103.90 a barrel, after settling at a seven-week low on Friday, while gold futures gained 0.6% to $1,326 an ounce. The dollar gained some ground against the euro and the yen.

In corporate news, Citigroup shares rose 3% after reporting first-quarter earnings and revenue that exceeded analyst estimates. Shares have taken a hit in recent weeks after the financial firm fell short of the Federal Reserve's test of its financial health.

TIAA-CREF is set to announce it is buying Nuveen Investments for $6.25 billion including debt, The Wall Street Journal reported. The acquisition would move TIAA-CREF up to become one of the U.S.'s biggest money managers.

WebMD Health surged 19% after the online health portal said it expects first-quarter results will be at least at the high end of expectations, helped recent improvement in sales activity.

European markets were broadly lower, as fresh tensions in Ukraine added to the pressures of last week's technology-led selloff. The Stoxx Europe 600 declined 0.1%, and was headed for the lowest close in three weeks. Adding to concerns, Ukraine mobilized its military over the weekend to counter pro-Russian militants who extended their control across several cities in the east of the country.

Comments from European Central Bank President Mario Draghi over the weekend that the strength of the euro could prompt further monetary easing to prevent inflation rate from falling too low had little effect on the currency or equity markets.

Germany's DAX 30 index gave up 0.2%, France's CAC 40 reversed an early loss to rise 0.1% and the U.K.'s FTSE 100 lost 0.1%.

Asian markets were mostly lower. Japan's Nikkei Stock Average lost 0.4% to a six-month low, after suffering last week the biggest weekly percentage decline since March 2011. China's Shanghai Composite inched up 0.1%.

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

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