Market Snapshot: U.S. stocks pressured as mood turns cautious ahead of Yellen speech

U.S. stock futures signaled a dip at the open Monday, as a drop in oil prices outweighed deal news.

S&P 500 futures ESU6, -0.21% fell by 4.70 points, or 0.2%, to 2,177, while Dow Jones Industrial Average futures YMU6, -0.25% lost 52 points, or 0.3%, to 18,488. Nasdaq-100 futures NQU6, -0.18% shed 10.25 points, or 0.2%, to 4,796.75.

September West Texas Intermediate crudeCLU6, -2.39% slumped 2.7% to $47.81 a barrel, with some analysts blaming a rise in the U.S. oil-rig count. Meanwhile, Morgan Stanley analysts poured cold water on hopes that major oil producers will freeze production.

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