US futures slide as Turkey’s economic woes continue By: CNBC.com News August 13, 2018 at 05:38 AM EDT U.S. stock index futures slipped ahead of Monday's open, as markets around the globe grew skittish over the future of Turkey's economy. Read More >> Related Stocks: Dow Industrials SPDR Nasdaq ETF S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust