By Barbara Kollmeyer and Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stock futures turned up Wednesday, shrugging off the weaker-than-expected ADP employment report. More economic signals will come later in the Institute for Supply Management's nonmanufacturing survey.

Futures for the Dow Jones Industrial Average (DJH4) edged up 5 points, at 15,343, while futures for the S&P 500 index (SPH4) is mostly flat at 1,743.10. Futures for the Nasdaq-100 (NDH4) inched up less than a point to 3,452.

Private-sector-employment gains slowed down in January, as employers added 175,000 jobs, while the December number was revised down to 227,000, according to the Automatic Data Processing Inc. report released on Wednesday. Economists had forecast a gain of 189,000 jobs, according to a Dow Jones Newswires survey.

At 10 a.m. Eastern Time, investors will get to gauge the health of the nonmanufacturing sector from ISM. Earlier in the week, markets got a shock when the ISM manufacturing survey showed a sharp slowdown among customers in January, triggering a big selloff for Wall Street. Spotlight on economy: ADP jobs report in crosshairs

"Given the run of misses we've seen in U.S. economic data of late, another shortfall here could serve to rattle traders," said Joao Monteiro, analyst at Monex Capital Markets, in a note. "While this latest correction may be close to having run its course, anything that suggests the U.S. economy is going to struggle as the QE tapering continues will give investors another reason to look for the exit."

A couple of Federal Reserve speakers are also on tap, with Philadelphia Fed President Charles Plosser due to speak on the economy at 12:30 p.m. Eastern Time in Rochester, N.Y. Atlanta Fed President Dennis Lockhart is scheduled to speak on the economic outlook at 1:40 p.m. Eastern Time in Birmingham, Ala.

Investors are eager to see which way markets will open after Wall Street closed Tuesday with modest gains, reclaiming a fraction of the worst losses since June seen on Monday. A smaller-than-expected factory drop for December helped the S&P 500 index (SPX) close 0.8% higher to 1,755.20. Greenhaus: S&P pullback is 'normal' so far, but 10% would be extreme

European stocks were set to break a three-day losing streak, albeit with modest gains, while stocks stabilized in Asia. Data showed a sharp drop in retail sales for the euro zone in December, and also a sharp revision in November. Gold and oil prices moved higher, while the dollar fell.

Humana Inc. (HUM) said it swung to a fourth-quarter loss of 19 cents, but stuck to its 2014 earnings guidance.

Merck & Co. Inc.(MRK) posted a drop in fourth-quarter profit and revenue. Shares rose in premarket.

Tableau Software Inc. (DATA) and Myriad Genetics Inc. (MYGN) saw a 13% and 14% respective gains in premarket after upbeat results late Tuesday.

Twitter Inc. (TWTR) and Walt Disney Co. (DIS) will release results after the market close.

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