US and Iran Trade Tanker Strikes as the IRGC Widens Its Maritime Zone

Iran and the United States struck tankers in what Reuters called the biggest wave of attacks on shipping since the war began.¹ US Central Command, which is responsible for American forces in the Middle East, confirmed the destruction of five tankers linked to Iran in the Persian Gulf.³ NewsNation reported the same five tankers destroyed as attacks widened across the Gulf.²

Iran said it targeted ten ships near the Strait of Hormuz, including two US vessels and eight oil tankers, after the American strikes.⁴ The Islamic Revolutionary Guard Corps said the action was retaliation for the destruction of Iranian commercial and oil vessels, and Tehran also targeted a US base in Jordan.⁵ Central Command denied an IRGC assertion that Iranian forces had struck two US Navy destroyers, saying the claim was “completely FALSE” and that all attempted Iranian attacks failed.^8,9 The two accounts of the same engagement have not been reconciled.^4,8

Why it matters to investors

Iran has largely choked off transit through the strait, which carried a fifth of global oil before the war.² Reuters reported that one third of Gulf oil is still missing from the data despite so-called dark crossings by vessels avoiding tracking.¹⁰ US Energy Secretary Chris Wright, clarifying a figure of 17 million to 18 million barrels, told Fox News the number was 18 million barrels per day.¹⁰

That missing third is the number to hold on to, because it separates the barrels that are merely untracked from the barrels that are not moving at all.^2,10 The IRGC said its maritime restricted zone would extend beyond Hormuz into the Gulf of Oman and the Arabian Sea.⁷ That announcement followed comments by Mohsen Rezaei, secretary of Iran’s Supreme National Security Council, quoted by Iranian state media.⁷

What to watch

IRGC spokesperson Hossein Mohebbi set six conditions for a ceasefire alongside the expanded blockade, including the complete withdrawal named among four additional demands.⁶ Those terms are the clearest published statement so far of what Tehran says would end the maritime campaign, and they arrived on the same day as the strikes rather than in place of them.^1,6

The gap between Iranian claims and Central Command’s denials is itself a market variable, because shipping and insurance decisions turn on which account of a given strike is accurate.^4,8,9 For now the measurable quantity is tonnage: how much crude actually clears the strait, against the fifth of global supply it once carried.^2,10 The extension of the restricted zone into the Gulf of Oman and the Arabian Sea widens the area where that question applies.⁷