Futures show further gains for US stocks as Brexit fears ease By: CNBC.com News June 21, 2016 at 06:13 AM EDT U.S. futures were indicating another positive start for major Wall Street indexes Tuesday as Brexit fears faded amid fresh polls. Read More >> Related Stocks: Dow Industrials SPDR PowerShares QQQ S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust Sentinelone Inc Cl A