US stocks set for a weak open, as corporate earnings trickle in By: CNBC.com News February 21, 2018 at 05:07 AM EST U.S. stock index futures fell into the red ahead of Wednesday’s open, extending losses seen in the previous trading session. Read More >> Related Stocks: Dow Industrials SPDR PowerShares QQQ S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust