By William L. Watts, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks opened on a weak note Monday, with investors looking ahead to this week's key data and a meeting of Federal Reserve policy makers, while a round of deal making moved stocks including retailer Saks Inc., drugmaker Perrigo Co. and advertising firm Omnicom Group Inc.

The S&P 500 Index (SPX) fell 2.5 points, or 0.1%, to 1,689.15, while the Dow Jones Industrial Average (DJI) dropped 15.9 points to 15,547.93. The Nasdaq Composite (RIXF) edged up 4.4 points, or 0.1%, to 3,617.57.

Shares of Dow component Boeing Co. (BA) slumped 1.1% in early action. The U.S. Federal Aviation Administration has proposed a $2.75 million civil penalty against the aerospace company, saying it failed to correct a problem with fasteners on its 777 airplanes for more than two years after its discovery in 2008.

United Technologies Corp. (UTX) and General Electric Co. (GE) were also lower, dragging on the Dow industrials.

Pending-home-sales data is set for release at 10 a.m. Eastern Time, but analysts said investors may already be looking ahead to the conclusion of this week's meeting of Federal Reserve policy makers on Wednesday and the release Friday of nonfarm payrolls data for July.

It wasn't quite a "merger Monday," but some deal news was jostling individual stocks. Shares of Saks Inc. (SKS) rose more than 3% after the retailer agreed to be acquired by Hudson's Bay Co. in a $2.4 billion, all-cash deal.

Shares of Elan Corp.(ELN) rose nearly 7% after Perrigo (PRGO) said it would use a combination of cash and stock to buy Elan for $16.50 a share, which is a 10.5% premium over Elan's closing price Friday. Perrigo shares dropped 3.4%.

Shares of Hertz Global Holdings Inc. (HTZ) dropped nearly 5%. The car-rental firm reported a 31% rise in second-quarter profits, earning 45 cents a share when excluding one-time items. A survey of analysts found a consensus forecast for earnings of 45 cents. See: Anadarko, Express Scripts in focus Monday.

Shares of Omnicon Group Inc. (OMC) jumped more than 7% after it and Publicis Groupe SA said Sunday that they will merge in the biggest advertising industry deal in history.

Simon Property Group Inc. (SPG) said Monday that second-quarter earnings rose 58%. The nation's largest shopping-mall operator logged higher funds from operations to beat analyst estimates and boosted its full-year outlook. Shares rose slightly.

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