By Barbara Kollmeyer, MarketWatch

ADP employment data will also give clues to jobless levels

MADRID (MarketWatch) -- Stock futures moved higher on Wednesday ahead of data expected to show growth in the U.S. economy, and the outcome of the Federal Reserve's meeting.

Tech stocks were already shining as shares of Twitter Inc. (TWTR)surged in heavy premarket volume after the social media network's results beat Wall Street forecasts. Futures for the Nasdaq-100 index (NDU4) rose 17 points, or 0.4%, to 3,969.25.

Futures for the Dow Jones Industrial Average (DJU4) gained 47 points to 16,892, while those for the S&P 500 index (SPU4) rose 6.5 points to 1,969.50.

Economic news and data will drop in focus for investors on Wednesday. First up will be ADP's employment report for July, which comes ahead of Friday's bigger nonfarm payrolls data. Data from ADP, the nation's biggest processor of company checks for employees, comes at 8:15 a.m. Eastern Time.

At 8:30 a.m. Eastern, investors will get a first look at second-quarter gross domestic product data, which is forecast to expand 3.2%. That would mark a snapback from a shocking 2.9% plunge in the first quarter, driven by extremely cold weather. First-quarter growth figures will also be revised, and that initial sharp drop could turn out to be smaller than expected.

"If the U.S. falls short of expectations here, it may suggest that the impact of the first quarter slowdown has stretched beyond the quarter itself and had an impact on the overall recovery," said Craig Erlam, market analyst at Alpari UK, in a note. The only silver lining to signs of a deeper slowdown are that it could delay the first rate hike, expected as early as the first quarter of next year, he said.

The Fed will release a policy decision at 2 p.m. Eastern Time. Economists expect the central bank to reduce the monthly pace of its bond purchases by another $10 billion to $25 billion, and signal that it intends to end QE3 in October. Markets will be glued to the Fed's statement, though, to see if there's any hint that the first interest-rate hike from the Fed could come sooner than expected or that rates could go up faster than anticipated.

U.S. stocks ended a choppy session lower on Tuesday after tougher sanctions against Russia for its role in Ukraine's civil war were announced. The S&P 500 (SPX) closed 9 points, or 0.5%, lower at 1,969.95 on Tuesday, while the Dow Jones Industrial Average (DJI) ended 70.48 points, or 0.4%, lower at 16,912 as upbeat data were overshadowed by those sanctions.

The Russia MICEX index of blue-chips surged more than 2% on Wednesday, which one analyst said was due to the fact that new sanctions didn't affect the country's key gas sector. Some strategists maintain, though, that Russia stocks remain a tricky bet in wake of those sanctions.

Also read: Need to know: Ditch your 'portfolio patriotism' ahead of dog days of August

Twitter rules

Shares of Twitter leapt 27% as analysts moved up price targets in the wake of blowout results. "Stronger results amid a negative sentiment should propel the stock higher," said Cantor Fitzgerald analyst Youssef Squali in a note to investors. He lifted his price target to $58 from $40. Read: Can Twitter convert the 'logged-out'?

Garmin (GRMN)sharply raised its forecast for the year, with the GPS -devices maker citing strong first-quarter results as reason for the improved outlook. Shares gained 6.9% ahead of the bell.

Humana(HUM) shares rose nearly 2% premarket. The health care insurer's profit fell slightly short of expectations, but sales beat forecasts. The company also confirmed its 2014 per-share guidance.

Shares of Sprint (S) rose 1.9% ahead of the open after the mobile-phone company swung to a profit in the second quarter, as the pace of subscriber losses slowed. Twitter, AmEx, Yelp among stocks to watch.

Amgen(AMGN) shares rose 3.8% in premarket after the company posted a 23% rise in earnings, and announced a 15% cut in its workforce as part of a restructuring program late Tuesday.

DreamWorks Animation SKG Inc. shares (DWA) could extend an 8% late-session loss after the movie studio swung to a second-quarter loss.

In other markets, crude-oil prices (CLU4) rose, gold (GCQ4) edged higher, and the dollar index (DXY), which measures the greenback against a basket of six currencies, traded mostly steady ahead of GDP data and the Fed meeting.

European stocks traded mostly flat, outside of gains in Spain after surprising economic growth data. In Asia, Hong Kong stocks rose for a seventh straight session.

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