Strait of Hormuz traffic returns to normal by end of May?
I assess a low but non-negligible chance (12%) that the IMF Portwatch 7-day moving average for Strait of Hormuz transit calls will reach or exceed 60 by May 31, 2026, because the short time window, persistent security and insurance disincentives, and the smoothing effect of a 7-day average make a rapid recovery unlikely, though a sudden de-escalation or export surge could push the metric above the threshold.
Analysis
Market prices (Yes ~3.3%, No ~96.7%) and large event volume indicate the betting public strongly expects traffic to remain below the 60 threshold; that consensus likely incorporates recent months of suppressed transits due to security concerns and rerouting. The clearest implication of the market is that the path to a qualifying 7-day moving average requires a sustained, multi-day rise in raw daily calls, not just a one-day spike, because the resolution criterion is a smoothed 7-day average.
Operational and geopolitical constraints remain the dominant external factors: recurring Houthi attacks in nearby waters, Iranian harassment and exercises in and around the Gulf, and elevated war-risk premiums on insurance have all historically discouraged normal transit behavior and pushed some owners to reroute or delay voyages. Conversely, the economy-driven baseline demand for Gulf exports (especially crude oil and tankers) provides structural upward pressure on transit counts, but that pressure competes with risk-driven avoidance and alternative logistics decisions.
From a data and statistical perspective, the 7-day moving average requirement significantly raises the bar; even if a few extra ships transit on a single day, the average will reflect the previous six days and likely remain below 60 unless the uplift is sustained across multiple consecutive days. Additionally, IMF Portwatch data publishing cadence and possible revisions within the market window can help or hurt the path to resolution; however, last-minute upward revisions are possible but not guaranteed and cannot be relied on as the primary mechanism for crossing the threshold.
Given the short remaining timeframe to May 31 (only a few days as of May 25), the balance of probabilities favors No, but not zero: a credible de-escalation, coordinated decisions by multiple Gulf exporters to increase sailings, or transient but sustained weather/port-clearance improvements could produce the necessary consecutive increases in reported calls. Taking into account the market-implied probability and these specific drivers, I put the chance at 12%, reflecting a small probability of rapid recovery rather than the market’s near-certain No.
Arguments
For
- A rapid de-escalation or diplomatic breakthrough could immediately lower perceived risk and prompt owners to resume normal routing.
- A coordinated surge in Gulf export loadings (e.g., producers releasing additional cargoes) could raise daily calls enough over consecutive days to lift the 7-day average.
- Temporary reductions in war-risk premiums or targeted insurance solutions could persuade marginal sailings to proceed through the Strait.
- IMF Portwatch revisions within the market window could upwardly adjust earlier reported days and help the 7-day average cross 60.
Against
- The 7-day moving average requires sustained increases, so single-day spikes are unlikely to be sufficient.
- Persistent security threats and high insurance costs continue to incentivize rerouting or voyage delays rather than transiting the Strait.
- Commercial shippers and charterers have already adjusted networks and may be reluctant to rapidly reverse those decisions.
- The remaining time until May 31 is very short, making it hard to accumulate the consecutive high daily counts needed.
- Large-volume oil and product flows can be reallocated to pipelines, terminals, or alternate routing that bypass the Strait.
- Market sentiment and liquidity indicate near-certain No, which likely reflects informed traders with access to shipping intelligence.
- Operational frictions such as congested ports or crew/shore labor issues can suppress transits even if demand exists.
Key drivers
- Current and near-term security environment in the Arabian Gulf, including Houthi activity and Iranian naval posture.
- War-risk insurance premiums and P&I club guidance that influence owners' routing and sailing decisions.
- Aggregate export volumes from Gulf producers (crude, refined products, LNG) and any short-term production increases or drawdowns.
- Decisions by major shipowners and operators about whether to route through the Strait versus alternative routes or delays.
- IMF Portwatch data publication timing and any intra-window revisions to previously posted daily counts.
- Port congestion, berthing availability, and Hinterland logistics that can cause transient spikes or dips in transit calls.
- Seasonal maintenance schedules for tanker and bulk fleets which can reduce or increase the active tonnage available for transits.
- International diplomatic moves or ceasefire/de-escalation signals that could rapidly reduce perceived risks to shipping.
Risk factors
- Renewed or sustained Houthi attacks in nearby waters that raise risk perceptions and cause continued rerouting.
- Targeted Iranian actions or military exercises that prompt commercial avoidance of the Strait or surrounding approaches.
- Persistently high war-risk insurance premiums that keep owners from transiting even if cargo demand increases.
- Large chartering decisions that divert tankers to longer alternate routes, reducing transit counts through the Strait.
- Delays or gaps in IMF Portwatch reporting that could leave a short window without publishable increases.
- Short timeframe left to May 31, which reduces the probability of achieving a sustained multi-day increase needed for a 7-day average.
- Port or regional infrastructure incidents (accidents, strikes, congestion) that temporarily suppress transits.
- Macroeconomic shocks or lower-than-expected demand that reduce exports and hence transit calls.
Scenarios
Best case
A rapid de-escalation (e.g., ceasefire or effective diplomatic intervention) coincides with a planned release of cargoes by Gulf exporters and a brief normalization of insurance terms, producing several consecutive days of elevated transits that push the IMF Portwatch 7-day moving average to or above 60 before May 31.
Most likely
Security conditions remain tense but stable, commercial adjustments (rerouting, scheduling) keep average transits suppressed, and any isolated upticks in daily calls are insufficiently sustained to lift the 7-day moving average to 60, resulting in a No resolution.
Worst case
Security incidents persist or escalate, war-risk insurance and owner caution remain high, and chartering patterns continue to favor rerouting and delayed sailings, leaving the 7-day average comfortably below 60 through the end of May and validating the market's near-certain No.
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