The Hormuz corridor rally is pricing ships that have not sailed

The Probability Desk — Wednesday, 26 August 2026

Oil gave back most of a week's war premium in three sessions because two foreign ministers in Tehran discussed a corridor. The corridor does not yet exist, the mines are cleared only in a social-media post, and the waterway's own traffic data still reads five transits a day against a 2025 norm of eighty-five. Today the Desk puts a number on the gap between the announcement and the water: a 45% probability that the Strait of Hormuz's visible traffic recovers to even one-third of normal by the end of March 2027 — and only 30% that it happens by New Year, which is roughly what this week's crude selloff appears to be celebrating.

The Trigger

On Tuesday 25 August, Oman's Foreign Minister Badr Albusaidi met his Iranian counterpart Abbas Araghchi in Tehran. Their joint statement, carried by the Oman News Agency, described a "phased framework" built on two concrete elements: "the establishment of a temporary joint navigation corridor through the Strait of Hormuz and an agreement to implement a joint project to clear the Strait of mines," with technical negotiations continuing toward a permanent corridor, future administration of the strait, information exchange and traffic management. Source: Iran–Oman joint statement via Oman News Agency, carried by Al Jazeera (AFP/Reuters), 25 Aug 2026. Albusaidi said on X he hoped the two countries would "soon announce" the temporary corridor. Iranian Deputy Foreign Minister Kazem Gharibabadi told the semi-official Tasnim agency the two sides would "negotiate a new permanent route within 30 to 60 days." Source: Bloomberg, 26 Aug 2026.

The same day, US President Donald Trump posted that "all mines have been removed and/or detonated from within the International Waters of the Strait of Hormuz," and that Iran had been notified any new mining would be "immediately and systematically destroyed." He provided no evidence; Bloomberg notes he has made the claim before and that European officials have previously been skeptical, given how slow and complicated mine clearance is. The claim is unverified. Source: Bloomberg, 26 Aug 2026.

The market treated the package as a reopening trade. Brent fell more than 4% on Monday toward $88, extended the decline toward $86 on Tuesday — a third consecutive down session — and traded just below $89 on Wednesday, at 88.73 on the continuous contract-for-difference quote, still up roughly 31% on a year earlier. Monday's other driver ran the same direction: Washington's 24 August sanctions package proved less aggressive than markets had expected, stopping short of immediate secondary sanctions on Iran's trading partners. Source: Trading Economics Brent stream, 25–26 Aug 2026 (CFD quotes, indicative). For calibration, the last official Brent spot print on FRED is $95.29 on 18 August — the selloff since is on the order of 7%. Source: FRED DCOILBRENTEU, read 26 Aug 2026.

The Forecast Question

Following the 25 August Iran–Oman interim-corridor framework, does the IMF PortWatch Strait of Hormuz 7-day mean transit count print at or above 30 on or before 31 March 2027?

Resolution source, sole arbiter: IMF PortWatch Daily_Chokepoints_Data (portid = chokepoint6, field n_total), 7-day trailing mean, as published. One touch resolves YES. Thirty transits is roughly 35% of the 2025 mean of 85.5 per day — and it is the exact level the June de-escalation window briefly reached. It marks "the corridor demonstrably moves ships," not normalisation. Source: IMF PortWatch, read 26 Aug 2026.

This question deliberately updates, and does not re-run, the Desk's 20 August forecast (reopening to ≥60 by end-2027, probability-weighted at 35%). Yesterday's statement fired that episode's named watch indicator — "Oman mediation channel producing a dated framework" — though without the sanctions relief its Upside condition attached; a new US sanctions round landed the day before instead. Source: The Probability Desk, 20 Aug 2026.

Where the water actually is

The strait has been largely closed since early March, when Iran moved to block the waterway after the 28 February US and Israeli strikes that killed Supreme Leader Ali Khamenei, and Washington imposed a naval counter-blockade on Iranian ports. About a fifth of the world's oil and LNG passed through Hormuz before the war. Source: Bloomberg, 26 Aug 2026.

The Desk's read of the full PortWatch daily series, pulled today:

• 7-day mean transit count, 17–23 August: 5.0. Latest daily observation (23 Aug): 3.
• 2025 calendar mean: 85.5 transits/day. January–February 2026, up to the eve of the 28 February strikes: 68.1. March 2026: 3.2.
• The last 7-day mean at or above 30 printed on 30 June 2026; the last at or above 60 printed on 2 March 2026.
• During the June de-escalation window (the US–Iran memorandum signed 17 June), the 7-day mean climbed from roughly 5 to a peak of 31.9 on 29 June — twelve days — then decayed after strikes resumed on 8 July. The window's 60-day term expired in mid-August without a successor. Source: IMF PortWatch, read 26 Aug 2026; Bloomberg, 26 Aug 2026.

Barrels and ships are telling different stories, and the divergence is information. The US Energy Department's Chris Wright said on 11 August that the seven-day average of oil leaving the strait had recovered to about 9 million barrels per day; research firm Commodity Context estimated the same week's peak nearer 7 million; maritime intelligence firm Windward counted just 10 vessel transits on 10 August against roughly 130 a day pre-war. Source: Al Jazeera, 12 Aug 2026. On Tuesday Trump said about 10 million barrels passed through the waterway in a single day (unverified), and satellite readings suggested Saudi loadings from terminals inside the Gulf may be increasing. Source: Trading Economics, 26 Aug 2026. Substantial volumes are evidently moving discreetly — some of them dark to AIS transponder counts. The oil market prices barrels. This forecast is about ships that show themselves: insured, transponding, countable commercial traffic — the thing a corridor exists to restore, and the thing the PortWatch feed measures.

Prior / Base Rate

Reference class: announced frameworks or clearance operations intended to restore traffic through a war-disrupted chokepoint, 1974–2026. Four members; partial restoration (about a third of prior traffic) arrived within seven months in two.

1. The June 2026 Hormuz memorandum — signed 17 June; visible traffic reached the 31.9 peak in twelve days; the regime collapsed within a month when strikes resumed. Restoration: yes, briefly. Source: IMF PortWatch, read 26 Aug 2026.
2. The Black Sea Grain Initiative — signed in Istanbul 22 July 2022; the first vessel, Razoni, sailed from Odesa on 1 August, ten days later; the corridor functioned for roughly a year before Russia declined to extend it in July 2023. Restoration: yes. Source: UN Secretary-General spokesperson statement, 1 Aug 2022; final UN coordinator operational update, 15 Jul 2023.
3. The Suez Canal clearance, 1974–75 — a mined and wreck-blocked waterway with full great-power cooperation and no active shooting: US-led clearance operations ran roughly nine months from spring 1974, and the canal reopened on 5 June 1975, about fourteen months after work began. Restoration inside seven months: no. Source: US Navy National Museum, "March–December 1974 — Suez Canal"; Wikipedia, "Closure of the Suez Canal (1967–1975)", tertiary, labelled.
4. The Red Sea, 2023–26 — the counterfactual with no agreed corridor: Suez transit calls fell from 73.7/day (2023) to about 40/day and have plateaued there for three years; Bab el-Mandeb averaged 27.8/day this month. Restoration: no. Source: IMF PortWatch, read 26 Aug 2026.

Base rate carried at 50%, with the honesty note that n=4 and the class is heterogeneous — a grain corridor and a peacetime canal clearance are imperfect analogues for a contested strait between belligerents. The class's sharpest lesson survives its small size: when the parties actually want a corridor, ships move in ten to twelve days; when they don't, waterways stay degraded for years. The distribution is bimodal, and the whole question is which mode this framework belongs to.

Evidence-Update Table

Prior (base rate): 50%. Published posterior: 45%. No probability below appears without the evidence that moved it.

Net: the framework materially raises the odds that an implementation regime begins; Iran's stated rationing strategy, the June regime's one-month lifespan, and the insurance drag pull the posterior slightly below the raw class frequency. The full prior-to-posterior arithmetic — three ensemble legs, weights and the aggregation rule — is documented in the desk worksheet accompanying this report.

The Scenarios

Weights sum to 100%, rounded to 5%. Probabilities are the UAO Probability Desk's, weighted across base-rate, expert-prior and simulation inputs.

BASE — The Rationed Strait — 50%

No qualifying print by 31 March 2027, without a return to sustained attacks. The corridor is announced — possibly soon, as Albusaidi hopes — but functions as an instrument of Iranian sovereignty rather than a throughput machine: a lane Tehran meters to keep pressure on Washington while its core conditions (naval blockade lifted, oil sanctions dropped, assets unfrozen) stay unmet. Discreet flows continue; insured, transponding traffic stays thin; underwriters keep Hormuz at prohibitive rates for standard commercial calls. The strait becomes what the Red Sea has been for three years — structurally degraded, priced as normal-for-now. Resolving indicator: PortWatch 7-day mean stays below 30 through 31 March 2027 and the Tail tripwire never fires — BASE is the residual no-crossing scenario.

UPSIDE — Ships Follow the Ink — 30%

A qualifying print on or before 31 December 2026. The corridor is announced within weeks, joint mine-clearance gives underwriters something auditable, war-risk premia fall from the 7.5–10% band toward low single digits, and the June pattern repeats with staying power: five to thirty in a fortnight, this time without a 8-July-style collapse. An AIS-legitimacy jump does part of the work — ships already moving discreetly begin transponding through a sanctioned lane. This is broadly the path the EIA's August outlook assumes and, on this week's evidence, the one crude is trading. Resolving indicator: first PortWatch 7-day mean ≥30 dated on or before 31 December 2026.

SETTLEMENT — Late Water — 15%

The crossing lands between 1 January and 31 March 2027. Implementation is real but slow: the 30-to-60-day negotiation window slips, littoral-state consultations (the statement pointedly reserves a role for the Gulf littoral states) add weeks, clearance verification drags — the Suez lesson that mine countermeasures are measured in months, not posts — and insurers re-enter in tiers. Resolving indicator: first qualifying print dated in Q1 2027.

TAIL — The Second Collapse — 5%

No crossing, and the framework dies the way the June memorandum died: renewed attacks on shipping, a strike cycle, or a sanctions rupture — the "financial institution" follow-through Washington trailed for this week, or the fuel-price unrest channel inside Iran — re-freezes diplomacy. The war-risk market moves from reluctance to effective withdrawal. Resolving indicator: two or more reported attacks on commercial vessels in any four-week window (UKMTO/CENTCOM reporting) with the 7-day mean below 10.

P(YES by 31 March 2027) = 45%.

The Monte Carlo — Simulation Results

Real simulation, shipped with this report (mc.py, mc_out.json): 50,000 paths, seed 20260826, weekly semi-Markov regime model over the 31 weeks from today to 31 March 2027. Three regimes — stalemate (current level ~5), corridor-implemented (logistic ramp toward a path-specific ceiling: a 60/40 mixture of "fast" ceilings around 35 and "rationed" ceilings around 22, the latter encoding Iran's stated strategy), and re-escalation (level halves toward ~2). Implementation hazard is elevated to 5%/week during weeks 5–13 (the stated 30–60-day window) and 2.5%/week otherwise; corridor-collapse hazard has median 6%/week, anchored between the June regime's roughly four-week life and the grain corridor's year; the ramp rate is anchored on the one directly observed implementation episode (five to 31.9 in twelve days). Started inside the corridor regime with a fast draw, the model crosses 30 in two to three weeks — it reproduces June.

• P(≥30 by 31 Mar 2027): 32.5% — decomposed 23.0% by 31 December 2026, 9.5% in Q1 2027.
• Conditional on crossing: first-crossing week P10 = 5 (late September), median = 13 (late November), P90 = 27 (early March).
• Of the 67.5% of paths that never cross: 58.2 points end in cold stalemate, 9.3 in renewed escalation.
• Fifteen-specification envelope: 12.5%–49.5% (joint-pessimistic to joint-optimistic legs). Sampling error ±0.18pp across ten reseeds — demoted: specification risk, not sampling noise, is the honest uncertainty.
• Limitations, stated plainly: the regime hazards rest on very few observed episodes (one implemented Hormuz framework, one grain corridor); the ceiling mixture encodes a strategic judgment about Iranian intent, not an estimated parameter; PortWatch transit counts are AIS-based and can jump discontinuously if dark traffic begins transponding — the model represents this only through the corridor-regime ramp; and the simulation shares the PortWatch series with the base-rate leg, which is why the aggregation caps their combined weight. MiroFish was not run and is not implied.

The published 45% sits above the simulation's 32.5% central figure because the base-rate and expert-prior legs both read stronger than the model — the aggregation and its logged weight adjustments are shown in the worksheet.

Market vs Desk View

What the market is pricing. Three consecutive Brent down-sessions into the corridor headlines — roughly $95 to $87–89 in a week on the quotes above — plus the EIA's August path ($85 average this quarter, $78 in Q4, $69 in 2027, on an assumption of flows "slowly increasing in September" and broadly pre-conflict trade patterns by early 2027). Source: EIA STEO, 11 Aug 2026. That is a market trading meaningful, near-dated restoration.

What the Desk's model says. A 30% probability of even one-third-of-normal visible traffic by New Year, 45% by end-March, and a modal outcome in which the corridor exists on paper while the strait stays rationed. The two views can partially reconcile — barrels can move discreetly while counted, insured traffic stays thin, and the price of oil answers to barrels. But the reconciliation has a limit: the EIA's own inventory arithmetic (global draws of 4.2 mb/d in Q2 and a forecast 3.8 mb/d in Q3) requires genuine flow restoration, not accounting reclassification, to stop the drawdown. If the Rationed Strait is the outcome, the $78 Q4 path is the mispricing; the Desk probability-weights that path at 50%, plus a 5% tail in which the premium returns violently. What consensus is missing, in one line: a corridor that exists to assert sovereignty is not the same object as a corridor that exists to move ships, and this week's tape priced the second while the statement described the first. What would prove the Desk wrong, equally in one line: a dated corridor announcement followed within two weeks by a PortWatch inflection — June showed exactly what that looks like, and it is watchable in daily data.

Universal-Owner Portfolio Heatmap

Direction and indicative magnitude of the reprice by scenario, 3–12 month view. Analytical, not advisory; magnitude bands: small <5%, moderate 5–15%, large >15% (asset-class level, not instrument level).

SETTLEMENT — Late Water (15%) maps as UPSIDE with a one-quarter lag: hold the BASE positioning through year-end, then rotate on the UPSIDE column as the crossing lands in Q1.

Second- and Third-Order Effects

The chain the Desk is watching, each hop stated as a conditional: if the Rationed Strait persists, Gulf producers keep paying for bypass — Saudi volumes stay routed via the East–West pipeline to Yanbu (Bab el-Mandeb liquids flows rose from 5.4 to 8.1 mb/d between 4Q25 and 2Q26 even as that strait carries its own Houthi risk), and the case for permanent trans-peninsula and ADCOP-style bypass capacity hardens from contingency into capex. Source: EIA STEO, 11 Aug 2026. If bypass becomes permanent infrastructure, the strait's chokepoint rent falls structurally — which is itself a reason Tehran may prefer to reopen sooner rather than watch its leverage depreciate. If war-risk premia stay near 7.5–10% of hull value, effective freight capacity shrinks and the cost passes to Asian importers first — Platts assessed Gulf-to-China crude freight at $77.96/mt on 22 July, up from $73.80 at the prior assessment and a multiple of pre-war rates, and India and China are the strait's largest customers. If the corridor succeeds instead, watch the reverse cascade: insurance softening, tonne-mile compression, an OPEC production-restart negotiation (June Goh's point that OPEC can only raise output once flows normalise in both directions), and a fiscal breathing space for Gulf sovereigns whose 2026 issuance calendars priced a war they may stop fighting.

Watch Dashboard

Thirteen indicators; the threshold is the reading that moves the Desk's weights.

Red-Team — How This Could Be Wrong

1. The AIS jump could make 30 trivial. If a corridor confers legitimacy, ships already transiting dark may simply switch transponders on. Counted traffic could leap from 5 toward 20+ in days without a single additional barrel moving — resolving YES on optics. The Desk's model carries this only inside the corridor-regime ramp; if visibility normalisation can occur without a corridor (for example, under the US Navy's unilateral escort-and-clearance posture), the 45% is too low. Falsifier: a PortWatch inflection with no announced corridor.

2. The reference class may be the wrong shape. Two of four class members are "parties genuinely wanted it" cases. If Oman's mediation reflects a genuine Iranian economic imperative — the fuel-price pressure inside Iran ahead of new sanctions suggests real strain — then this episode belongs to the fast mode, and both the June collapse and the Red Sea plateau are the wrong anchors. Falsifier: technical talks producing a signed route document inside Gharibabadi's own window.

3. The Desk may be over-reading Iran's ceiling. The rationing argument leans on Iranian official statements that full reopening awaits US concessions. Stated bargaining positions are not revealed preferences; Iran reopened meaningfully in June while its conditions were equally unmet. If the ceiling mixture is wrong — if "temporary corridor" means 40–50 transits rather than 20–25 — the crossing probability rises mechanically. The 15-spec envelope's optimistic leg (49.5%) is largely this error. Falsifier: corridor traffic composition showing third-country tankers, not just Iran-linked traffic, inside the first fortnight.

Methodology Box

The Probability Desk probability-weights scenarios; it does not predict. Today's weights combine three inputs under a written aggregation rule — a four-member historical base rate (0.35), dated expert priors (0.30), and a 50,000-path Monte Carlo simulation (0.35) — normalised to 100% and rounded to 5%; input weights, their logged adjustments from the default, the reference class, every prior source and the full simulation configuration are in the accompanying desk worksheet and mc.py. The forecast enters the Desk's public calibration log today with a blank outcome row, to be graded on first-publication PortWatch data after 31 March 2027, Brier-scored. Probabilities are the UAO Probability Desk's, weighted across base-rate, expert-prior and simulation inputs. Methodology available on request.

Editorial scenario analysis only. Not investment, actuarial, or geopolitical advice.

Source Ledger

Every figure in this report resolves to one of the entries below (institution · what was used · date · confidence).

1. Iran–Oman joint statement, via Oman News Agency — corridor + mine-clearance text; littoral-states language. 25 Aug 2026. H
2. Al Jazeera (AFP/Reuters) — trigger report; Trump mine post text; war chronology; "traffic remains largely paralysed"; Iran's three conditions (naval blockade, oil sanctions, frozen assets). 25 Aug 2026. H
3. Bloomberg (V. Ali-Khan, A. Shahla; carried by Insurance Journal) — "interim framework"; Gharibabadi 30–60 days; Jacobs quotes; June deal expiry; Khamenei killed in 28 Feb strikes; closed since March. 26 Aug 2026. H
4. IMF PortWatch, Daily Chokepoints dataset (ArcGIS FeatureServer) — all Hormuz/Suez/Bab el-Mandeb transit statistics; full-series pull, snapshot shipped. Read 26 Aug 2026. H
5. EIA Short-Term Energy Outlook — Hormuz liquids 21.6→4.9 mb/d; Bab el-Mandeb 5.4→8.1; shut-ins 5.5 mb/d; inventory draws 4.2/3.8 mb/d; Brent $85/$78/$69 path; early-2027 normalisation assumption; Brent $69 low (2 Jul) and $105 high (23 Jul). Released 11 Aug 2026. H
6. FRED, DCOILBRENTEU — Brent spot $95.29, print of 18 Aug 2026. Read 26 Aug. H
7. FRED, DCOILWTICO — WTI spot $86.48, print of 18 Aug 2026. Read 26 Aug. H
8. FRED, DGS10 — US 10-year 4.70%, 24 Aug 2026. Read 26 Aug. H
9. Trading Economics, Brent — 88.73 (+0.17% d/d) 26 Aug intraday; +31% y/y; CFD, indicative. 26 Aug 2026. M
10. Trading Economics news stream — Mon >4% decline extending Fri's −2.4%; Tue third session toward $86; sanctions "less severe than anticipated"; Bessent wind-down remarks. 24–25 Aug 2026. M
11. Trading Economics news stream — Trump "around 10 million barrels" Tuesday; Saudi Gulf-terminal loadings satellite read; EIA weekly inventories virtually unchanged. 26 Aug 2026. M
12. S&P Global Commodity Insights (Platts) — Marcus Baker, Marsh: Hormuz war-risk 7.5–10% of hull vs 1–3% weeks earlier; Bab el-Mandeb 0.5%; PG–China freight $77.96/mt. 22 Jul 2026. H
13. Al Jazeera (J. Power) — Windward 10 transits (11 Aug) vs ~130 pre-war; Wright ~9 mb/d claim; Commodity Context ~7 mb/d; Waterer and Goh quotes; Qatar FM "advanced stage"; CENTCOM vessel action; Houthi Bab el-Mandeb attack. 12 Aug 2026. H
14. UN Secretary-General spokesperson — first BSGI vessel (Razoni) sailed Odesa 1 Aug 2022, initiative signed 22 Jul 2022 in Istanbul. 1 Aug 2022. H
15. UN Office of the Coordinator, Black Sea Grain Initiative — final operational update, initiative's last active days. 15 Jul 2023. M
16. UN in Türkiye — BSGI first ship departure record. Aug 2022. M
17. US Navy, National Museum of the US Navy — "March–December 1974 — Suez Canal": clearance operations timeframe. Read 26 Aug 2026. H
18. Wikipedia — "Closure of the Suez Canal (1967–1975)": reopening 5 Jun 1975; "1974 Suez Canal Clearance Operation": Nimbus Star from 12 Apr 1974. Tertiary, labelled. Read 26 Aug 2026. L
19. Axios — Bessent 24 Aug sanctions: "Operation Economic Outcast"; ~60 designations; five secondary-sanction areas (digital assets, technology, gold, aviation, shipping); "not going to set a timeline"; trailed financial-institution action. 24 Aug 2026. M
20. NPR — corroboration of the 24 Aug sanctions unveiling and framing. 24 Aug 2026. M
21. The Washington Post — sanctions package "delays toughest blow" (secondary-sanction deferral). 24 Aug 2026. M
22. Badr Albusaidi (X, via Al Jazeera/Bloomberg) — "soon announce"; "future management of the strait and a permanent solution will follow in due course"; regional-partner language. 25 Aug 2026. M
23. The Probability Desk — 20 Aug 2026 episode: prior forecast (reopen ≥60 by end-2027 at 35%), tripwire list, dated Kalshi reads (45% on 6 Aug for pre-2027 normalisation). Published 20 Aug 2026. M
24. Al Jazeera — Iran fuel-price hike signal on the eve of new US sanctions (domestic-strain datum, headline-level). 23 Aug 2026. L
25. Anna Jacobs, Arab Gulf States Institute (via Bloomberg) — "baby step… the wildcard is Trump." 26 Aug 2026. H

Data note: PortWatch historical rows revise; the 20 Aug edition's 2025 mean (75.16) and June-window peak (26.71) differ from today's full re-pull (85.53; 31.86). Today's figures are as published on 26 Aug 2026 and the raw snapshot ships with this report.

Probabilities are the UAO Probability Desk's, weighted across base-rate, expert-prior, and multi-input ensemble methods. Methodology available on request. Editorial scenario analysis only — not investment, actuarial, or geopolitical advice.

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