US futures fell on Friday, with S&P 500 and Nasdaq 100 contracts down over 1% and Dow Jones futures tumbling 350 points, as disappointing results and signs of credit stress at regional banks reignited concerns about US credit quality, sending global stocks sharply lower. Zions Bancorporation dropped more than 1% in premarket trading after a 13.1% decline in the previous session, following the disclosure of a $50 million Q3 loss on two loans from its California division. Western Alliance fell 2.4% after a 10.8% drop, as it initiated a lawsuit alleging fraud by Cantor Group V, LLC. Major lenders were also under pressure before the opening bell, including Bank of America (-2.4%), Morgan Stanley (-1%), Goldman Sachs (-1.5%), and Citigroup (-1.9%). Traders will turn their attention to earnings reports from several regional banks due today, along with American Express. For the week, the S&P 500 added 1.2%, the Dow Jones gained 1%, and the Nasdaq soared 1.6% so far.