Before the bell: S&P futures 3.0%, Nasdaq futures -2.6%
U.S. stock futures fell on concern that a Greece referendum pledged by Prime Minister George Papandreou may threaten Europe’s bailout.
U.S. stock futures fell also as China's official PMI unexpectedly fell to 50.4 from 51.2 in September.
Bank stocks are falling hard premarket on fears that Greece's referendum could scuttle the bailout deal: BAC -6.3%, JPM -5.3%. BAC’ shares also may be weighed by pressure to reverse its planned monthly debit card fee after more rivals decide to drop similar plans.
Jon Peddie Research estimates PC graphics chip shipments rose 18.4% Y/Y in Q3, and that Intel's (INTC) market share rose to 60.4%, Nvidia's and AMD’s share fell.