US stocks set for a positive open ahead of Powell testimony By: CNBC.com News February 27, 2018 at 05:59 AM EST U.S. stock index futures fluctuated ahead of Tuesday's open, showing signs of pulling back from the previous session's highs. Read More >> Related Stocks: Dow Industrials SPDR PowerShares QQQ S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust