U.S. oil prices surged and stock markets declined on Tuesday as President Donald Trump announced an 8 p.m. Eastern Time deadline for Iran to reopen the Strait of Hormuz. Trump warned that failure to comply could lead to sweeping airstrikes targeting Iranian infrastructure, including power plants and bridges.
The S&P 500 dropped 46 points (0.7%) to 6,566, the Dow Jones Industrial Average fell 324 points (0.7%) to 46,346, and the Nasdaq Composite declined 1.1%. Brent crude, the international oil benchmark, rose 1% to $110.81 per barrel, while the U.S. benchmark, West Texas Intermediate, jumped 2.9% to $115.70 per barrel.
Rising oil prices have contributed to an increase in U.S. gasoline prices, which reached an average of $4.14 per gallon on Tuesday, up from $2.98 before the outbreak of hostilities between the U.S. and Iran. The closure of the Strait of Hormuz has tightened global oil and liquefied natural gas supplies since the conflict began in late February.
On Tuesday morning, President Trump posted on Truth Social that “a whole civilization will die tonight” unless a deal with Iran is reached before his deadline. He added, “I don’t want that to happen, but it probably will.”
Investor Response and Market Implications
Despite the high stakes, market reactions were relatively muted ahead of the deadline. Nigel Green, CEO of investment firm de Vere Group, described the situation as a “potentially huge market event” with a clear binary outcome: either diplomatic de-escalation or direct military strikes on Iran.
Analysts at Mizuho Bank noted that this deadline is part of a cycle of escalating ultimatums that has extended several times since late March, suggesting that a full resolution to the conflict remains uncertain. Meanwhile, Wall Street analyst Adam Crisafulli of Vital Knowledge commented that although Trump’s rhetoric is increasingly aggressive, an expanded military campaign against Iran’s civilian infrastructure carries significant risks and costs.
Crisafulli indicated that because of these costs, the administration might seek a diplomatic exit to avoid further escalation, especially as the U.S. has already met some strategic objectives and Iran has made limited concessions.
Why it matters
The Strait of Hormuz is a critical chokepoint for global oil shipments, and its continued closure threatens to exacerbate inflation and disrupt energy markets worldwide. Any U.S. military strikes on Iran could significantly escalate tensions in the Middle East, impacting global markets and geopolitical stability.
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