US stock markets today: Dow falls 400 points, S&P 500, Nasdaq slip as bond yields rebound
US stocks opened lower on Thursday, August 20, as a rebound in Treasury yields and a rise in oil prices weighed on investor sentiment. The Dow Jones Industrial Average fell 0.6% at the open, while the S&P 500 declined 0.3% and the Nasdaq Composite slipped 0.5%, after all three major indexes ended higher in the previous session.