What Moved the Market
The Polymarket contract on whether President Donald Trump will announce that the United States has lifted its blockade of the Strait of Hormuz by May 31, 2026 fell 14 percentage points over the past 24 hours, to 44%. The 7-day decline totals 32.5 percentage points. The market window runs from April 13 to May 31, 2026.
This is an extreme single-day downward move by the market’s recent standards, with a 24h z-score of 56.0 and an extreme 7d z-score of 5.17.
Why It Likely Moved
- The repricing appears driven by April 27 remarks from the U.S. Secretary of State, published by the U.S. State Department, describing the blockade as targeted at Iranian shipping and justifying its continuation pending acceptable arrangements for international waterways.
- Markets reacted to the same interview’s emphasis that any “opening” of the straits on Iranian terms (e.g., coordination or tolling) would be unacceptable—signaling conditions for lifting are unresolved rather than imminent.
- The UK government, in an April 27 statement at the UN Security Council, called for stepped-up efforts to safeguard international waterways from disruption, reinforcing a policy posture focused on security and continuity of maritime norms rather than rapid de-escalation (UK government).
- Brent crude at $111.57/bbl is up 9.48% over 7 days, a macro signal consistent with ongoing supply risk premia and no clear market expectation of a near-term blockade lift.
- According to an April 29 report, Iran’s rial hit a record low while a fragile ceasefire “still holds,” underscoring continued pressure on Iran without accompanying official signals that the U.S. blockade has ended (AP News).
How Strong the Move Is
With a 14pp drop in 24 hours and an extreme 24h z-score, the move is sharp rather than routine. The 7-day decline of 32.5pp, also tagged as extreme, indicates this is a continuation of a downward trend rather than a one-off dislocation.
Overall, this looks like a trend continuation with an extreme single-day leg down, not a reversal.
Cross-Market Confirmation
- “By April 30” variant: 2.1% (−3.4pp 24h, −33.4pp 7d) — directionally aligned decline, consistent with reduced odds of any near-term lift.
- “By May 15” variant: 23.0% (−13.0pp 24h) — confirms shorter-window skepticism mirrors the main market’s move.
- “End of military operations against Iran by May 31”: 30.0% (−6.5pp 24h, −25.0pp 7d) — corroborates broader de-escalation expectations have been marked down.
News & Real-World Context
- On April 27, the U.S. Secretary of State stated that the current ceasefire with Iran exists but framed the Hormuz issue around preserving international waterways without Iranian control or tolling, and characterized the blockade as targeting Iranian shipping specifically (U.S. State Department, April 27, 2026). These are official policy signals on both the scope and conditions for any change.
- The UK government, addressing the UN Security Council on April 27, urged collective action to safeguard maritime routes from disruption, reinforcing a security-first international posture on strategic waterways (UK government, April 27, 2026).
- Iran’s rial hit a record low with a shaky ceasefire still in place, highlighting sustained economic pressure amid unresolved diplomatic terms (AP News, April 29, 2026).
- European policymakers are publicly querying aviation fuel market stresses, reflecting broader energy security concerns that would be sensitive to Hormuz developments (European Parliament, April 29, 2026).
Bottom Line
Markets sharply marked down the probability of an official U.S. announcement lifting the Hormuz blockade by May 31, 2026. The move appears tied to authoritative U.S. statements that keep the blockade’s rationale and conditions intact, with no clear signal of imminent change.
Given aligned declines across related markets and firm macro signals in oil, this repricing looks like a short-term continuation of a broader reassessment rather than a transient fluctuation.
Market Conditions at Time of Writing
- Current Probability: 44.0%
- 24h Change: -14.0pp
- 7d Change: -32.5pp
- Volume (24h): $220,007.29
- Open Interest: $159,465.63
- Spread: 1.0pp
- Z-score (24h): 56.0
