By Kate Gibson

NEW YORK (MarketWatch) -- U.S. stocks tallied mild losses on Monday as investors took a break after a four-week winning stretch.

"It is normal to see periodic short-term market pullbacks after extended rallies," noted Fred Dickson, chief investment strategist at Davidson Cos.

But, "the stock market remains reasonably valued, especially when compared to the ultra-low interest rates seen in the bond market," added Dickson, who calculates equities are trading at 12 times estimated 2011 S&P 500 operating earnings.

On pace for its best September performance since 1939, the Dow Jones Industrial Average (DJI) slid 6.10 points, or less than 0.1%, to 10,854.88.

Two-thirds of the Dow's 30 components were lower, with aluminium giant Alcoa Inc. (AA) falling the most, off 1.2%. Hewlett-Packard Co. (HPQ) gained the most, with shares of the technology firm up 1.3%.

The Standard & Poor's 500 Index (SPX) was off 2.7 points, or 0.2%, to 1,146, with health-care shares weighing the most.

The Nasdaq Composite Index (RIXF) declined 6.64 points, or 0.3%, to 2,374.49.

Declining stocks barely outpaced those advancing on the New York Stock Exchange, where 208 million shares traded as of 10:45 a.m. Eastern.

Wall Street's modest retreat came along with another round of deal-making in the airline, consumer products and retail sectors.

Southwest Airlines Co. (LUV) said it would acquire AirTran Holdings Inc. (AAI) for about $1.4 billion. Consumer-products maker Unilever NV (UN) agreed to purchase beauty-products maker Alberto Culver Co. for $3.7 billion and Wal-Mart Stores Inc. (WMT) offered to pay nearly $4.3 billion for South African distributor Massmart Holdings Inc. (MMRTY)

Shares of M&T Bank Corp. fell on reports the company's merger talks with Banco Santander SA had derailed.

 
 
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