How did the Hormuz situation develop over the summer?

The chronology's current entry is a disagreement between the count and the price, and we record it rather than resolve it. Saudi Arabia cut its November price to Asian buyers by $3 a barrel, Gulf crude exports are reported above pre-war levels, and shippers are paying crews to run the strait in shuttles despite Iranian threats. December Brent settled at $100.32 on 5 October, down for a second day. A restricted departure count with a seller cutting price says the oil is reaching buyers by routes or vessel patterns the daily count does not fully capture — or that the count is overstating the restriction. The engine reported no coverage for 5 October, so the latest covered reading is 218 on 4 October.

**Marked to market, 20 September — two of three.** Departures printed 273 on 19 September, a second close beneath the 293 floor after the 280 of 17 September. The seven-day average has fallen to 290.1 and now sits 15.0% below the thirty-day mean of 321.0. One further close beneath 293 completes the three-in-a-row this chronology set as the threshold for calling a thinning a restriction. We record that the count is moving the way the falsifier anticipated and that it has not yet completed.

**Marked to market, 18 September — the range low has broken for the first time.** The engine's departure series recorded 280 sailings through the strait on 17 September, below the 293 low this chronology has used as the floor of the corridor's range since mid-August, and the lowest settled day since 15 August. The seven-day average fell to 305.6 against 334.0 the week before. That is the first of the three consecutive closes below 293 that the falsifier names, so the restriction reading has not yet fired — but the thinning is no longer inside its old range. It arrived on the day crude fell for a third straight session, to $101.91 WTI and $104.82 Brent, on the expectation that Saudi Arabia will push more oil out through the Gulf while its East-West pipeline is shut. The chronology's current entry is a price falling on rerouted supply the transit count has not yet recorded.

Mid-June: a risk premium stripped out by diplomacy. July: kinetic, with a 20% Hormuz toll floated and walked back on 16 July, and the barrel moving on both legs. Early August: the war leg settled and the closure leg detached from it, with the 15 August deadlines expiring unsigned.

Mid-August was the fight over duration rather than over the event — a cost level without an event, with Brent closing $6.96 above WTI on 18 August because the sea-traded barrel carried the transit risk and the landlocked one did not.

Late August turned it, and the turn is visible in price rather than in expectations. Washington declared the strait cleared of mines on 25 August and Iran and Oman began work on a temporary corridor. Across the same sessions Brent's premium over WTI narrowed steadily — $7.33 on 21 August, then $7.16, $6.22, $5.61, $4.99, $4.66 — while the strait's daily departure count held its 293-to-346 range throughout. Traffic never collapsed and the sea-traded barrel steadily lost its scarcity.

September opened with the sharpest test of that reading. On 1 September US forces launched a fresh barrage at Iranian targets around the strait. WTI rose 5.20% to $90.22 and Brent 4.60% to $94.65 — and the premium between them narrowed again, to $4.43, while the waterway cleared 334 departures against a 321 average. The flat price rose on risk to the whole complex; the chokepoint did not recover its pricing power.

The chronology's current entry, then, is an escalation that raised the barrel without restoring the strait's grip on it, alongside a settlement under discussion that grants transit and no revenue. Iran has continued to say the strait remains closed, and reporting indicates any reopening is conditional on US compliance.

Methodology note: this position previously cited market-implied probability bands. Antevo retired that layer from published research on 1 September 2026; the readings below are rebuilt on observable series — settled prices, the Brent-WTI spread and the engine's own daily tanker-departure counts. The view is unchanged by the substitution; where the evidence is now thinner, that is said.

Early September escalated twice, and the second is a different kind of event from the first. On 5 September Iranian missiles were fired at US Navy warships and the United States struck three Iranian oil tankers in response; Iranian state-linked reporting says six vessels were hit, one near Kharg Island. CENTCOM has begun designating shadow-fleet tonnage. Cairo has called publicly for the resumption of US-Iran talks and warned against wider regional escalation, while US intelligence has briefed prolonged escalation and the US Vice-President has said he would not call the conflict a war.

The chronology's current entry is that the conflict has moved from targets around the waterway to the tonnage moving through it, and that the corridor has still not registered it. Crude rose 9.52% across the week to 4 September while the engine's Strait of Hormuz departure series logged 325 sailings on 5 September against a thirty-day average of 324.2 — baseline traffic. The strikes are too recent for a daily series to have absorbed them, so the honest entry is a moving price against an unmoved transit count, which is the same gap this timeline has carried since mid-August and the first time a physical event has been available to close it.

**Marked to market, 17 September — the stated falsifier has fired.** This position said the departure count holding beneath its thirty-day baseline for two consecutive settled sessions after the tanker strikes would mean the corridor had finally registered a physical event. It did so on four consecutive days: 312 on 13 September against a thirty-day average of 325.5, then 307, 302 and 311 on 16 September against 327.9. The gap this chronology carried since mid-August — a moving price against an unmoved transit count — is closed. We mark it as such.

The size of the event matters as much as its existence. Those four readings sit inside a thirty-day range of 293 to 354, and the range's low was set before the Houthi strikes on Saudi Arabia, so this is a thinning rather than a restriction. The price has since moved the other way: on 16 September WTI fell 3.21% to $102.43 and Brent 2.69% to $105.83 as Saudi Arabia moved to restore a key pipeline, and Brent's premium over WTI stood at $3.40. The chronology's current entry is a strait that thinned measurably while the barrel gave back part of its premium on a repair elsewhere.