Amazon stock plunged 8% in premarket trades Friday. The e-commerce giant reported second-quarter results that topped Wall Street's expectations, but gave a mixed outlook. For the current quarter, Amazon predicted sales of $176.75 billion at the midpoint of its range, compared with analyst expectations for $173.27 billion.

September S&P 500 E-Mini futures (ESU25) are down -0.93%, andSeptember Nasdaq 100 E-Mini futures (NQU25) are down -1.03% this morning as U.S. President Donald Trump’s sweeping import tariffs fueled concerns about the outlook for economic growth.

Stock futures moved sharply lower Friday morning as investors reacted to news that the U.S. plans to impose higher tariffs on dozens of countries.