By Kristina Peterson

NEW YORK (MarketWatch) -- U.S. stocks on Monday extended gains into a fourth straight week after the group in charge of dating the start and end of downturns declared the U.S. recession ended last summer.

"It doesn't mean growth is robust, but it is growth," Paul Nolte, managing director at Dearborn Partners, said of Monday's declaration by the National Bureau of Economic Research that the longest U.S. recession since World War II ended in June 2009.

Not far from session highs, the Dow Jones Industrial Average (DJI) was up 107.43 points, or 1%, to 10,715.28.

All but one of the Dow's 30 components rose, including International Business Machines Corp. (IBM), up 1%, after the company said it would buy business-software firm Netezza Corp. (NZ) for $1.7 billion.

"Companies are flush with cash and valuations are pretty cheap, so I would think M&A is only going to accelerate for the next six months," said Maris Ogg, president at Tower Bridge Advisors.

The S&P 500 (SPX) gained 11.82 points, or 1.1%, to 1,137.41, with consumer discretionary leading gains among its 10 industry groups.

The Nasdaq Composite Index (RIXF) advanced 25.92 points, or 1.1%, to 2,341.53.

Roughly four stocks rose for every one on the decline on the New York Stock Exchange, where 456 million shares had been exchanged as of 2 p.m. Eastern.

The NBER report propelled the S&P 500 past levels not breached since May, with investor sentiment already bolstered by home-builder Lennar Corp. (LEN) topping forecasts, reporting a better-than-expected quarterly profit and a drop in orders that proved less dreary as experienced by others in its industry.

The National Association of Home Builders on Monday reported its monthly index of builders' sentiment remained unchanged in September at an 18-month low. Read more about builders' sentiment.

In its report, the NBER cautioned that its finding did not represent a forecast about the future, saying if another downturn occurs it would represent a separate recession -- a scenario viewed as unlikely by most economists.

Investor sentiment has turned "more positive because the economic news has been better than feared, so it's more a sigh of relief," Ogg said of Wall Street's recent climb.

 
 
 
 
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