Strait of Hormuz traffic returns to normal by end of May?
I assess a low probability (10%) that the IMF Portwatch 7-day moving average for Strait of Hormuz arrivals will reach or exceed 60 by May 31, 2026, because the short time window and the smoothing effect of the 7-day average make a rapid rebound unlikely absent a clear, immediate security and commercial signal.
Analysis
Time is the dominant constraint: with only about 12 calendar days remaining until May 31, a 7-day moving average reaching 60 requires not just a few high-count days but a sustained surge in daily arrivals that can overcome the influence of the prior 7 days included in the moving average. Without visibility into the current published 7-day average from IMF Portwatch in this prompt, the market price (Yes ~5.5%) indicates participants believe recent averages are well below 60 and that the necessary surge is unlikely to materialize in the remaining window.
Operational and commercial inertia works against a rapid normalization: even if a short-term de-escalation or protective naval measures were announced, shipping companies and charterers typically require time to re-route, re-book, and update itineraries, and insurers and brokers need to adjust hull and war risk terms; those frictions reduce the likelihood that large numbers of vessels will immediately resume transits through the Strait and push a 7-day average over the threshold within days. Conversely, the Strait historically supports well above 60 daily transits in normal conditions, so a return to that level is feasible if the underlying security and commercial conditions revert very quickly.
Market signal and information asymmetry: the very low market-implied probability and the high event volume suggest informed players are pricing in persistent disruption or slow recovery through month-end; however, markets can underreact to low-probability, high-impact diplomatic breakthroughs or rapid operational fixes, so there remains a small nonzero chance that an abrupt change (e.g., coordinated naval escorts, immediate lifting of commercial routing restrictions, or publication quirks/revisions) could trigger the threshold being met. Given these competing considerations and the limited timeframe, I place the probability modestly above the market-implied 5% to account for tail scenarios, but still low because of practical timing and smoothing constraints.
Arguments
For
- A rapid, credible de-escalation or ceasefire could immediately restore shipping confidence and prompt some vessels to resume transits.
- Coordinated naval escort operations or opening of protected corridors could enable a short-term surge of ships through the Strait.
- Backlogged vessels waiting for clearance could produce a concentrated wave of transits that lifts the 7-day average if they transit within the window.
- Within-window upward revisions by IMF Portwatch to previously published daily counts could retroactively raise the 7-day moving average above 60.
Against
- The 7-day moving average smooths daily volatility, so even a few high-count days may be insufficient to overcome the prior week’s low values before May 31.
- Commercial and insurance-related decisions generally change on multi-week lead times, limiting the number of ships that can reroute back to the Strait in under two weeks.
- Persistent regional security concerns and the risk of renewed incidents make shippers cautious and likely to keep longer detours in place.
- If current published averages are substantially below 60, the magnitude of surge required is implausibly large in the remaining timeframe.
Key drivers
- Current 7-day moving average level on IMF Portwatch, which determines how large and sustained any surge must be to reach 60.
- Immediate changes in security conditions (e.g., de-escalation, ceasefire, or major reduction in attacks) that would permit ships to resume direct transits.
- Commercial decisions by shipowners and charterers to re-route vessels back through the Strait rather than continuing longer detours.
- Insurance premiums and war-risk cover availability, which materially influence routing choices on short notice.
- Implementation of protective measures like international naval escorts or convoying that could restore carrier confidence quickly.
- IMF Portwatch publication timing and any within-window upward revisions to recent daily arrival counts.
Risk factors
- A new security incident or escalation in the region that suppresses traffic further through month-end.
- Lag in commercial itinerary changes meaning vessels scheduled away from the Strait will not return in time to affect the 7-day average.
- High insurance or chartering costs keeping traffic diverted despite any modest improvement in security.
- Delayed or missing Portwatch data publication reducing the number of qualifying dates before the deadline.
- Port congestion or chokepoints at alternative routes that extend vessel transit times and prevent rapid return.
- Market misinformation or late data revisions that change the baseline 7-day average unfavorably within the window.
Scenarios
Best case
A rapid, verifiable de-escalation combined with immediate deployment of multinational escorts and quick insurer adjustments triggers a concentrated wave of transits and/or favorable data revisions, pushing the IMF Portwatch 7-day moving average to 60 or more by late May.
Most likely
Security remains fragile and commercial routing decisions are slow to change, so daily arrivals may rise modestly but not enough to overcome the smoothing effect of the 7-day average, resulting in the threshold not being met by May 31 and a No outcome.
Worst case
A fresh security incident or continued deterrent conditions keep daily arrivals low or cause further declines, ensuring the 7-day moving average stays well below 60 and the market resolves to No with little ambiguity.
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