Stock futures are sharply lower Friday morning as concerns about global trade tensions reignited following fresh social media posts from President Donald Trump.

U.S. stock futures swung into the red from slightly positive territory ahead of Friday's market open, as Apple shares fell in premarket trading after a tariff threat from President Trump. S&P 500 ...

Eastern time, the S&P 500 rose 0.1%, the Dow Jones Industrial Average was up 0.1%, and the Nasdaq Composite was 0.5% higher.

This is the fourth "90% day" for the U.S. market in the past month. Two have been 90% up days and two have been 90% down days. When the frequency of 90% days increases, that is not good for stocks. A ...

U.S stocks finished mostly flat on Thursday in choppy trading that saw gains fizzle near the closing bell. The Nasdaq and megacap tech stocks still advanced. Investors have been on edge about rising ...