US stock futures mostly flat as earnings season gets under way

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U.S. stock index futures pointed to a flat open on Friday as traders digested some big earnings reports and economic data.

Bank of America and BlackRock both reported mixed quarterly results, as earnings per share topped analyst expectations but sales fell short. JPMorgan Chase, meanwhile, beat on both sales and profits, while Wells Fargo's results disappointed Wall Street.

On the data front, retail sales rose 0.6 percent in December, around consensus estimates. PPI rose 0.3 percent, in line with estimates. Consumer sentiment and business inventories are also set to come out at 10:00 a.m. ET.

In Europe, the pan-European Stoxx-600 index was around 0.54 percent higher on Friday.