By Saumya Vaishampayan 

U.S. stock futures held steady Wednesday ahead of a Federal Reserve decision that is likely to end its latest bond-buying program.

The Fed's unprecedented monetary stimulus, which included three rounds of bond-buying programs since the financial crisis, has been credited in part with fueling stock-market gains in the period.

Dow Jones Industrial Average futures added seven points to 16943. S&P 500 futures fell two points, or 0.1%, to 1978 and Nasdaq-100 futures declined seven points, or 0.2%, to 4087. Changes in stock futures, however, don't always accurately predict stock moves after the opening bell.

Facebook Inc. shares dropped 7.3% in premarket trading, weighing on the S&P and Nasdaq. The social network said costs rose 41% in the third quarter and finance chief David Wehner said he expects Facebook to incur higher expenses than normal in the coming quarters because of big investments.

Stocks rallied on Tuesday, with the Dow gaining 1.1% to close at 17005.75. The Nasdaq rose 1.7% to 4564.29 and the S&P 500 advanced 1.2% to 1985.05.

Stocks have whipsawed since mid-September, when the Dow and the S&P closed at all-time highs. Stocks subsequently plunged, hitting a low about a month later, amid fears of slowing global growth. In the past two weeks, stocks have broadly recovered as investors focus on U.S. corporate earnings, with Tuesday's gains carrying the S&P 500 and the Nasdaq Composite into positive territory for October, but still below levels seen in September. The Dow remains down 0.2% for October and off 1.6% from its Sept. 19 record, as of Tuesday's close.

That market volatility is likely to continue as Federal Reserve officials now begin to debate when to raise short-term interest rates, which have been near zero since December 2008, said Steven Wieting, global chief investment strategist at Citi Private Bank.

"Monetary policy just can't be as certain as it's been," he said. "It just can't be as clear and supportive for easy financial conditions across asset classes."

Fed officials have been winding down the bond-buying program all year. At their September meeting, policy makers decided to completely end those purchases after this month if the economy continued to improve.

Ahead of the Wednesday afternoon statement on monetary policy, it is considered certain that the Fed will end its latest bond-buying program. But recent comments from Fed officials show that bond purchases, or quantitative easing, will remain in the central bank's tool kit.

The end of the bond-buying program sets up for an eventual increase in interest rates, widely expected sometime next year. Investors will be parsing the Fed statement for guidance on when short-term rates could rise.

"The initial move up in short rates is not likely to be a disaster for the economy, and therefore not for equities," said Mr. Wieting. That's because tightening monetary policy is usually driven by strong economic growth. "But it does add to volatility," he said.

The Stoxx Europe 600 rose 0.4%, boosted in part by positive earnings from Danish logistics company DSV AS.

In commodity markets, crude-oil futures rose 1% to $82.18 a barrel. Crude-oil prices tumbled this month, hitting a 2014 settlement low of $80.52 a barrel on Oct. 22, weighing on stocks of energy companies. "Figuring out where the bottom is in oil is key in the marketplace," said Mr. Wieting of Citi Private Bank.

Gold futures inched down 0.2% to 1227.50 an ounce.

The yield on the benchmark 10-year Treasury note rose to 2.291% from 2.284% on Tuesday. Yields rise as prices fall.

In corporate news, health insurer WellPoint Inc. raised its outlook after reporting better-than-expected quarterly earnings. Shares were unchanged in premarket trading.

Hershey Co. reported a 5.8% increase in sales in the latest quarter. But the company lowered its guidance for the year because of lower-than-expected international sales amid macroeconomic challenges. Shares fell 3.7% in premarket trade.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com

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