U.S. stock benchmarks were trading mostly lower at the open on Thursday after the worst session for the major averages in months as investors continued to fret over rising bond yields and the prospect of higher interest rates and the impact that both factors could have on equity prices. The Dow Jones Industrial Average DJIA, +0.19% was down 0.6% at 25,456, while the S&P 500 index SPX, +0.29% fell 0.5% at 2,770, and the Nasdaq Composite Index COMP, +0.36% declined by 0.5% at 7,385.