US stocks expected to tumble at the open as US prepares China tariffs By: CNBC.com News June 15, 2018 at 05:45 AM EDT U.S. stock index futures fell deep into negative territory ahead of Friday's open, as the topic of trade continues to resurface. Read More >> Related Stocks: Dow Industrials SPDR Nasdaq ETF S&P 500 Ishares Core ETF S&P Depository Receipts