By Saumya Vaishampayan 

U.S. stock futures rose Wednesday, boosted by upbeat earnings from Twitter Inc. and Garmin Ltd.

The first reading on U.S. economic growth in the second quarter and a policy statement from the Federal Reserve are due Wednesday.

About 90 minutes ahead of the open, Dow Jones Industrial Average futures added 47 points, or 0.3%, to 16892.

S&P 500 index futures gained seven points, or 0.3%, to 1970 and Nasdaq-100 futures rose 18 points, or 0.4%, to 3969. Changes in stock futures don't always accurately predict stock moves after the opening bell.

Stocks fell Tuesday amid news that the U.S. and the European Union had adopted new economic sanctions against Russia. The Dow lost 0.4% to 16912.11 and the S&P 500 dropped 0.5% to 1969.95.

Stocks have surged to records this year, fueled by low interest rates, improving labor-market data, and strong corporate earnings. But yet another quarter of significant growth disappointment could weigh on the market.

At 8:15 a.m. Eastern, investors are set to get a reading on private-sector employment. Economists expect the ADP survey to show the private sector added 238,000 jobs in July. The data will be followed by a reading on second-quarter growth, with economists calling for an expansion of 3.0% versus a contraction of 2.9% in the first quarter.

"There was a certain sense that the first quarter was a write-off" because of the harsh winter, said Brad McMillan, chief investment officer for Commonwealth Financial. "We don't have that excuse this time." Data showing economic growth of less than 1% could suggest that the economy hasn't recovered in the way investors had thought, which could cause investors to reassess their outlook for stocks, he said.

Still, a number that's only slightly less than 3% will likely be shrugged off by the market because of its current tendency to move higher, he said.

The Federal Reserve's monetary-policy statement is due Wednesday, with expectations for another cut in monthly bond purchases to $25 billion from $35 billion. Officials are likely to discuss when and how to raise short-term interest rates from near zero, where they have been since late 2008.

In corporate news, shares of Twitter jumped 25% in premarket trade. The social-media company reported second-quarter revenue that more than doubled and posted its second consecutive quarter of accelerating user growth, reassuring investors about the service's popularity.

Garmin posted stronger-than-expected second-quarter earnings and lifted its outlook for the year. Shares jumped 6.9%.

Amgen Inc. said it intends to cut its workforce by 12% to 15% and close facilities in two states as it aims to concentrate resources on developing new drugs. Shares rose 3.5% premarket.

U.S.-listed shares of AstraZeneca PLC rose 1% premarket after the company agreed to buy the rights to a portfolio of inhaled drugs from Almirall SA. The deal is worth up to $2.1 billion.

Humana Inc. reported a second-quarter profit that met analyst estimates, while revenue topped expectations. Shares rose 1.9% in premarket trade.

Overseas, the Stoxx Europe 600 index was little changed.

In commodity markets, gold futures rose 0.1% to $1,299.00 an ounce and crude-oil futures added 0.4% to $101.33 a barrel.

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