US futures indicate a slightly upbeat open amid US-China trade frictions By: CNBC.com News September 10, 2018 at 04:00 AM EDT U.S. stock index futures posted minor gains ahead of Monday's open, as investors kept a close eye on trade developments. Read More >> Related Stocks: Dow Industrials SPDR Nasdaq ETF S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust