Strait of Hormuz traffic returns to normal by end of May?
I assess a low but non-negligible chance that IMF Portwatch will show a 7-day moving average of transit calls for the Strait of Hormuz of at least 60 by May 31, 2026; I place the probability at 8% based on the high threshold, short time remaining, and current market consensus favoring 'No'.
Analysis
Market-implied probability is very low (Yes at ~4.6%), reflecting broad market skepticism that traffic will rebound to the 60+ 7-day moving average threshold within the remaining nine days. The event attracts substantial capital (about $19.8M volume) indicating strong attention and that the market price likely embeds informed views and recent private information; my independent assessment is somewhat higher than the market's because IMF Portwatch revisions within the market window and abrupt operational changes can produce rapid visible spikes.
Historically, the Strait of Hormuz carries large volumes of tanker traffic but the raw count of daily transit calls fluctuates with shipping patterns, regional security incidents, and seasonal freight demand; the 7-day moving average threshold of 60 is high and requires sustained daily counts near or above that level, not a single isolated high day. Without confirmed recent data showing a multi-day surge already underway, achieving a qualifying 7-day average before May 31 requires either an already-ongoing multi-day increase or a near-immediate and sustained surge in calls — both of which are low-probability scenarios absent a clear exogenous change.
Operational and reporting mechanics work in favor of a small chance: IMF Portwatch publishes and sometimes revises data, and the market’s rules allow qualifying revisions made within the timeframe to count, so late upward revisions to preceding days could create a qualifying 7-day average even if real-time counts were lower. Conversely, the short remaining window, continued market pricing at under 5% for Yes, persistent regional risks that have driven rerouting and higher insurance costs in the past, and the logistical inertia of merchant fleets imply that the more likely outcome is that the moving average remains below 60 by the deadline.
Arguments
For
- A rapid diplomatic de-escalation or ceasefire could immediately restore confidence and trigger a clustered return of transit calls.
- IMF Portwatch upward revisions to earlier published daily counts within the market window could retroactively lift a 7-day average above 60.
- Commercial pressure to shorten voyage times and cut costs can prompt charterers to resume direct passage through the Strait once perceived risk falls.
- Seasonal demand increases in late spring could push more laden voyages to use the shortest route, boosting daily transit counts.
Against
- Sustained elevated security risks and insurance premiums are likely to keep many ships on longer alternate routings, suppressing Strait transits.
- Even a sudden single-day spike in arrivals will not by itself qualify unless it is part of a sustained multi-day increase sufficient to raise the 7-day moving average.
- Logistical inertia in tanker and dry-bulk scheduling means vessels already rerouted may not return in time to influence the May 31 7-day average.
- Market price already reflects strong consensus against Yes, suggesting that informed participants see little credible path to a qualifying 7-day average.
Key drivers
- Immediate changes in regional security or de-escalation that allow ships to resume or return to direct Strait transits.
- Short-term operational decisions by charterers and shipowners to re-route back through the Strait as insurance premiums and convoy costs fall.
- IMF Portwatch data publication schedule and potential upward revisions to already-published transit counts within the market window.
- A sudden shipping demand spike (e.g., seasonal cargo surges or oil cargo releases) that materially increases daily transit counts for multiple consecutive days.
Risk factors
- Ongoing regional hostilities or new incidents that keep traffic diverted and prevent a multi-day rebound in transits.
- High insurance rates or persistent commercial caution that sustain rerouting away from the Strait despite reduced geopolitical tensions.
- Reporting gaps or lags that delay the appearance of recovered transit counts until after the May 31 cutoff.
- The statistical difficulty of raising a 7-day moving average to 60 without a clear multi-day sustained increase in raw daily counts.
Scenarios
Best case
A swift and verifiable reduction in regional incidents plus rapid commercial decisions to resume direct transits leads to a sequence of high daily arrival counts and IMF Portwatch publishes a 7-day moving average hitting or exceeding 60 before May 31, potentially aided by upward revisions to earlier days.
Most likely
There is some incremental recovery in transit counts, but it is either too small or too late in the month to lift the 7-day moving average to 60, and IMF Portwatch data through May 31 therefore stays below the threshold leading to a No resolution.
Worst case
Security incidents persist or intensify and insurance/operational caution stays elevated, keeping daily transit counts low or unchanged so the 7-day moving average never approaches 60 and the market resolves to No decisively.
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