US stocks set to extend gains after Dow jumps over 650 points on Monday By: CNBC.com News March 27, 2018 at 05:08 AM EDT U.S. stock index futures posted solid gains ahead of Tuesday’s open, extending the gains seen in the previous trading day. Read More >> Related Stocks: Dow Industrials SPDR PowerShares QQQ S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust