IRGC Declaration Following Strikes Reshapes Strait of Hormuz Market

IRGC Declaration Following Strikes Reshapes Strait of Hormuz Market

Will Iran close the Strait of Hormuz by...? · Polymarket · Resolves 12/31/2026 · Volume $4,088,519 December 31 49.6% · June 30 47.3% · March 31 39.5%

Where the market stands Even with the war starting, the market currently suggests that a closure by end of March is only around 40%. The end of the year is slightly more probable than a mid-year event. You can track all outcomes for this market on Polymarket.

Recent headlines Tensions around the Strait of Hormuz intensified significantly on February 28 when the US bombed Iran, killing supreme leader Khamenei during operation Epic Fury. On March 1, multiple sources reported that Iran's Islamic Revolutionary Guard Corps (IRGC) declared a blockade of the Strait following the US and Israeli airstrikes. This declaration, while not officially confirmed by the Iranian government, prompted immediate concern among shipping entities. Major shipping companies such as MSC, CMA CGM, and Hapag-Lloyd reacted by directing vessels to safe shelter areas or pausing transits, according to [Lloyd's List.maritimeintelligence.informa.com/LL1189498/Iran-attacks-prompt-Red-Sea-rethink-as-box-shipping-exits-Strait-of-Hormuz). An oil tanker off the coast of Oman was struck on March 1, indicating an escalation of direct conflict, per [Al Jazeera.aljazeera.com/news/2026/3/1/how-us-israel-attacks-on-iran-threaten-the-strait-of-hormuz-oil-markets). Earlier, on February 28, the US and Israel launched joint operations targeting Iranian sites, which directly preceded Iran's response regarding the Strait, as reported by [The Times of Israel.timesofisrael.com/strait-of-hormuz-key-oil-route-in-middle-of-iran-crisis/). Pole Star Global data showed a 162% increase in Persian Gulf vessel traffic on February 28, suggesting emergency responses, and a 95.6% drop in activity from Iranian-flagged vessels after the strikes. Before these events, on February 17 and 18, Iran temporarily closed the Strait for IRGC naval drills, named "Smart Control of the Strait of Hormuz," which coincided with nuclear talks between Iran and the US, per Caspian News. The US Maritime Administration also issued an alert on February 9 regarding risks to commercial vessels, noting an attempted seizure incident on February 3.

What's driving the odds The recent US and Israeli strikes on Iranian targets directly impact the odds by raising the likelihood of a retaliatory closure by Iran. The markets sitting at only 40% on Polymarket suggests that a full, sustained blockade is difficult to implement and maintain, with immediate, short-term disruptions more probable than longer ones.

Key factors to watch One factor is any official statement from the Iranian government regarding the IRGC's blockade declaration, which could be reported by outlets like Tasnim News Agency. Observe any further military actions by the US, Israel, or Iran in the region, with analysis potentially coming from organizations like the Council on Foreign Relations. Monitor global oil prices, as a significant surge could signal market belief in a sustained closure, tracked by sources such as Reuters Commodities. Track shipping advisories and vessel movements from international maritime organizations like UKMTO.

The picture right now The biggest unknown is whether the Iranian government will formally and indefinitely declare a closure, moving beyond the IRGC's current warnings. The most likely path forward involves continued, localized disruptions and threats to shipping without a full, long-term blockade, as such a move would heavily damage Iran's own economy.