Futures for the Dow Jones Industrial Average dropped as the Nasdaq composite saw a significant decline on Monday due to concerns surrounding President Trump's decision to block the Strait of Hormuz. This led to a notable downturn for companies like Micron, Sandisk, SK Hynix, and SpaceX. Additionally, oil prices experienced a spike in response to the blockade. The post-market performance indicated a negative trend for these companies on the stock market.