US stocks set for a positive open as investors await inflation data By: CNBC.com News March 13, 2018 at 05:39 AM EDT U.S. stock index futures posted slight gains ahead of Tuesday’s open with investors monitoring some key economic data. Read More >> Related Stocks: Dow Industrials SPDR PowerShares QQQ S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust