By Kate Gibson, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks turned higher Tuesday, with the S&P 500 in position for its longest monthly win streak since 2009, as the market mulled economic reports and corporate earnings.

Several analysts cited the market's lofty levels as part of the equation.

"We're coming off a peak," said Alan Skrainka, chief investment officer at Cornerstone Wealth Management in Des Peres, Mo., who chalked up the day's action to the "normal ebb and flow" of the equities market.

"There's some technical resistance right at the high," Randy Frederick, managing director of active trading and derivatives at the Schwab Center for Financial Research, said of the 1,593.61 close, a record, by the S&P 500 (SPX) on Monday.

On Tuesday, the S&P 500 index was up 2.14 points at 1,595.75, with healthcare companies driving losses and technology the best performing of its 10 major industry sectors. The index is on track to rise 1.7% in April, which would mark a sixth straight month of gains and the index's longest winning run since a seven-month stretch that ended in September 2009.

Apple Inc. (AAPL) shares surged 3.3% after the iPhone maker detailed a six-part bond offering in a regulatory filing on Tuesday. Read story about potential impact on the bond market.

The order book, one means of measuring investor demand for the debt, hit $50 billion, according to Bloomberg News, which cited a person familiar with the transaction. The offering could pan out to be the largest non-bank bond sale in history, as Apple looks for cash to reward shareholders.

The Dow Jones Industrial Average (DJI) added 2.45 points to 14,821.20, with its 30 components evenly divided between red and green.

Blue-chip losses were led by Pfizer Inc. (PFE), down 3.4% after the drug manufacturer cut its 2013 profit outlook and reported first-quarter earnings that missed Wall Street estimates.

International Business Machines Corp. (IBM) gained after the computer-services provider hiked its dividend and approved a $5 billion share buyback.

The Nasdaq Composite (RIXF) rose 17.89 points to 3,324.91, readying the tech-laden index for a 1.8% monthly gain.

For every two shares on the decline, more than three gained on the New York Stock Exchange, where 324 million shares traded as of 1:30 p.m. Eastern. Composite volume approached 2 billion.

Other notable movers had Aetna Inc.'s (AET) shares rising 3.2% after the health insurer reported a slight drop in first-quarter earnings but raised its full-year operating-earnings estimate.

Best Buy Co. (BBY) shares rallied 6.7% after the electronics retailer said it would sell its 50% stake in Carphone Warehouse Group's European business to Carphone Warehouse.

Pitney Bowes Inc. (PBI) retreated 16% after releasing first-quarter results and cutting its dividend.

The day's economic reports were mixed. The S&P/Case-Shiller home-price index rose 0.3% in February, and 9.3% year-over-year, while a gauge of manufacturing in the Chicago area slid to a more-than three-year low in April and the Conference Board's consumer-confidence index jumped sharply in April.

The Federal Open Market Committee will begin its two-day meeting on monetary policy on Tuesday, with a decision slated for Wednesday. With inflation below the Fed's 2% target, and data last week showing the U.S. economy growing less than expected in the first quarter, the FOMC is expected to keep its bond-buying program at $85 billion a month.

On Thursday, the European Central Bank could trim its benchmark interest rate.

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