By William L. Watts and Carla Mozee, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks posted a mixed performance Monday as investors awaited economic data, including the June jobs report later this week, leaving major indexes on track for the biggest second-quarter gains since 2009.

The S&P 500 (SPX) declined 0.48 point, or less than 0.1%, to 1,960.48, while the Dow Jones Industrial Average (DJI) lost 31.03 points, or 0.2%, to 16,820.81 The Nasdaq Composite (RIXF) rose 6.21 points, or 0.1%, to 4,404.14. See: Stock market live blog.

"Equities are on track for their fifth straight month of gains as investors continue to shrug off market concerns and carry on embracing risk. However, the current lofty market levels are creating concerns that global central banks are storing up dangerous risks of excessive leverage as they pursue overly stimulative policy for too long," said Rebecca O'Keeffe, head of investment at Interactive Investors in London, in a note.

Among individual stocks, shares of Yahoo Inc. (YHOO) gained 2% after Piper Jaffray upgraded shares to overweight.

The economic calendar is light. Stocks posted little reaction to a weaker-than-expected reading on the Chicago Purchasing Managers' Index, which came in at 62.6. Economists polled by MarketWatch had forecast a reading of 64.3. In May, the business barometer accelerated to 65.5, its highest level of the PMI since October.

The National Association of Realtors' gauge of pending home-sales for May is due at 10 a.m. Eastern. The April reading showed a rise of 0.4%.

Financial stocks will likely be in focus during the session, as the U.S. Justice Department is expected to announce BNP Paribas will pay nearly $9 billion in a settlement for allegedly engaging in transactions with sanctioned countries. Executives at the French bank had admitted it had been processing potentially illicit dollar transactions with countries on Washington's blacklist years after the U.S. began investigating the lender.

Also read: MannKind leaps, American Apparel sinks

This week will be shortened by the Independence Day holiday on Friday, which means closely watched U.S. jobs data for June will be released on Thursday. Economists are looking for the addition of 215,000 nonfarm-payrolls jobs and no change in the unemployment rate of 6.3%.

Monday's session will mark the end of trading for June as well as for the second quarter. After a run to record closes, the S&P 500 Index is poised for a quarterly gain of 4.7%, and the Dow Jones Industrial Average was looking at an increase of 2.2%. The Nasdaq Composite Index was also set for a quarterly gain of 4.8%.

For the first half of 2014, the S&P 500 was on track for a 6% rise, with the Dow industrials up 1.4%, and the Nasdaq up 5.4%. Airline, pharmaceutical, and utilities stocks led advancers during the period, which was marked by the impact of bad weather, a drop in first-quarter gross domestic product and a decline in Treasury yields.

Also read: Market exuberance out of touch with economy

In other markets, Asian shares ended mixed, with Japan's Nikkei Average posting a 0.4% gain. European stocks were flat after a reading of steady inflation in the euro zone.

The ICE dollar index (DXY), which pits the greenback against six other currencies, fell to 79.985 from 80.331 late Friday.

Oil futures (CLQ4) were off 4 cents at $105.70 a barrel, and gold futures (GCQ4) declined $6.20 to $1,313.80 an ounce.

More must-reads from MarketWatch:

Forget first-quarter shocker: economy OK

Japanese industry makes (modest) rebound

Europe studying Abenomics lessons from Japan

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