Goldman Sachs, Chevron Corp., J.P. Morgan Chase and Exxon were among the components set to lead the Dow Jones Industrial Average lower Tuesday in what's setting up as a sharp fall at the opening bell. Chevron is off 2.7% and J.P. Morgan was nearly 3% lower in pre-market trade. Meanwhile, Visa Inc. was down 2.5% and Goldman's shares were 2.8% lower in premarket. Stock-index futures for the Dow are down nearly 400 points and point to turbulent start to September trading for stocks. Futures for the S&P 500 were down 49 points and those for the Nasdaq were off 111 points.
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