President Trump ordered a US military blockade of the Strait of Hormuz after peace negotiations with Iran broke down. S&P 500 futures fell 0.7% in premarket trading on the news. The Strait of Hormuz is one of the world's most critical oil shipping chokepoints, responsible for roughly 20% of global oil supply flows.
A Hormuz blockade is a severe supply shock event — oil prices will likely spike sharply, hitting energy-consuming sectors like airlines, transport, and manufacturing hardest. Defense stocks typically rally in escalation scenarios, while broad equity markets face pressure as higher energy costs squeeze corporate margins and consumer spending. Expect volatility across equities, commodities, and safe-haven assets like gold and Treasuries.
Immediate: Oil futures open (WTI and Brent crude). Next 24-48 hours: Official Pentagon and State Department statements on blockade scope. Watch for emergency OPEC+ communications. Monitor any Iranian military response announcements.
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