Strait of Hormuz traffic returns to normal by end of May?
Given the very short time window remaining and persistently low market-implied odds, I assess a low probability that IMF Portwatch will publish a 7-day moving average of Strait of Hormuz transit calls >=60 before May 31, 2026; I estimate an 8% chance of Yes.
Analysis
There is only about one week left in the market window (through May 31, 2026), so any qualifying 7-day moving average must include data from the immediate preceding week; absent an already-elevated 7-day average in Portwatch data today, achieving >=60 requires an abrupt and sustained increase in daily reported transits over the coming days. I do not have live Portwatch figures here, but the market price (Yes ~3.7%) and high volume indicate traders see this as highly unlikely, which is consistent with the short lead time for ships to alter routing and schedules.
Historically, Strait of Hormuz traffic can exceed 60 daily transits in benign security conditions, but regional security incidents, targeted attacks on shipping, and commercial rerouting around the Cape of Good Hope in prior years have depressed direct transits and raised variability; reversing those trends typically requires days-to-weeks of sustained change in either security conditions or commercial incentives, not just a single-day event. Seasonal patterns in crude exports can raise tanker calls, but overall merchant schedules and insurance-driven routing decisions mean sudden jumps in reported transit counts are constrained by vessel itineraries and operators' risk calculations.
Market structure and data-source considerations also matter: IMF Portwatch's published counts depend on what ships are reported in their monitoring system, and a reporting or methodology change could produce a step change in published counts within the market window, which is a low-probability but nonzero path to Yes; conversely, revisions after May 31 are excluded, so any qualifying value must appear in published data on or before the final date. The large event volume suggests many informed participants have already bet No, reducing the likelihood of a big contrarian move without a concrete, rapidly-developing catalyst.
External catalysts that could plausibly lift counts quickly include a rapid de-escalation negotiated by regional powers, a sudden surge in oil exports requiring immediate redeployment of tankers through Hormuz, or a temporary lifting of targeted interdictions; however, each of these requires near-immediate operational follow-through to affect the 7-day average before the end of the month, making them unlikely within the available timeframe.
Arguments
For
- A rapid diplomatic breakthrough could immediately reduce perceived risk and prompt vessels to resume normal routing through Hormuz.
- A sudden spike in Gulf crude export demand could force a short-term increase in tanker transits through the strait.
- Portwatch could incorporate additional reporting feeds or correct undercounting within the market window, raising published transits.
- A coordinated repositioning of commercial fleets or military escorts could temporarily boost daily transit counts above the threshold.
Against
- Only a few days remain to generate a 7-day moving average >=60, making sustained increases before May 31 unlikely.
- Ship routing decisions and schedules generally have lead times longer than a few days, limiting rapid increases in transit counts.
- Regional security and insurance costs continue to discourage direct transits and favor longer but safer alternate routes.
- Market-implied odds and heavy No-side volume suggest informed participants expect no qualifying spike in the available timeframe.
Key drivers
- Immediate change in regional security posture or a sudden ceasefire that reduces risks for transiting vessels.
- Rapid operational decisions by shipowners and charterers to reroute vessels back through the Strait of Hormuz within days.
- Short-term surge in crude or product exports from Gulf producers that forces additional tanker transits through Hormuz.
- An IMF Portwatch reporting methodology change or sudden inclusion of additional reporting sources that raises published transit counts.
- A concentrated fleet movement (e.g., a convoy or repositioning) producing several extra daily calls sustained for a week.
Risk factors
- Continued or increased incidents of harassment, attacks, or seizures that deter traffic from transiting Hormuz.
- Permanent or semi-permanent rerouting of commercial traffic around Africa that cannot be reversed quickly.
- High insurance premiums and war-risk surcharges that keep owners from sending ships through the Strait on short notice.
- Delays in Portwatch data publication, limited coverage, or exclusion of relevant ship movements from their dataset.
- Operational inertia and scheduling lead times that prevent a meaningful uptick in daily transits within a single week.
Scenarios
Best case
A swift and public diplomatic de-escalation coupled with a documented, near-immediate decision by several ship operators to resume Hormuz transits leads to daily counts rising sharply enough over the next week that IMF Portwatch publishes a 7-day moving average >=60 before May 31.
Most likely
No major diplomatic or operational shock occurs in the next week, incremental or seasonal changes fail to push the 7-day moving average to 60, and the market resolves to No; a small chance remains for a reporting anomaly or concentrated short-term surge to produce a qualifying published value.
Worst case
Security incidents or a fresh wave of harassment cause further declines in daily transits and Portwatch publishes continued low counts, ensuring no 7-day average reaches 60 and the market resolves to No decisively.
More from this day
- politicsPolymarket-
US announces new Iran agreement/ceasefire extension by...?
AI65%MKT16%Edge+49Hidden GemGiven the short timeline but strong market conviction and clear U.S. incentives to avoid a lapse, I assess a modestly higher-than-even chance that the U.S. will publicly announce a qualifying extension or successor agreement by May 26.
- sportsPolymarketEnded
Where will George Pickens play in 2026-27?
AI35%MKT69%Edge-34HypedGiven Pickens' expected free agency status in 2026 and Atlanta's plausible need for outside receiving talent, I assess a below-market but meaningful probability that he signs with the Falcons for 2026-27, weighing competition from other suitors and the possibility the Steelers re-sign him or he signs elsewhere.
- politicsPolymarket2y
Republican Presidential Nominee 2028
AI25%MKT3%Edge+22Hidden GemI assess a roughly one-in-four chance that Donald Trump will win and accept the 2028 Republican presidential nomination, meaning Yes is unlikely but plausible if several favorable conditions align for him.