U.S. stock futures fell on May 4 following reports of Iran striking U.S. naval vessels. The S&P 500 futures decreased by 0.55%, Dow Jones futures dropped 0.73%, and Nasdaq 100 futures declined 0.51%. Meanwhile, crude oil prices surged, with Brent crude reaching $111 per barrel, marking a 3.75% increase, and WTI crude jumping 5.54%.