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Stock futures waver after 2Q GDP as expected

U.S. stock-index futures fluctuated between small gains and losses on Friday, after the third estimate for second-quarter gross domestic product came in as expected, and following a selloff in the previous session.

The reading come in at up 4.6 percent, higher than the previous annualized estimate of 4.2 percent and in line with expectations.

Friday's session will also see the final reading of the University of Michigan's consumer sentiment survey for September.

Ahead of the open, BlackBerry posted a smaller quarterly loss and its CEO projected the tech company would double its software revenue next year. Its shares edged higher in pre-market trading.

Janus Capital Group surged on news that Bill Gross is leaving Pacific Investment Management Co., the investment firm he co-founded, and would be joining Janus Capital.

Friday's markets are expected to be volatile, as investors weigh whether this week's selloff is the start of a bigger pullback or just end-of-quarter profit-taking.

Analysts cited a combination of factors for the sell-off, including a story on a Russian draft law that would allow the seizure of foreign assets— a long-held fear of investors.