Brent was down at least 5% after four of five Iran pauses. Shipping data cannot tell us why

By Cumulant Research | 2 August 2026

Trump's latest announcement arrived before either a completed agreement or an observable post-announcement Brent spot pricespot priceThe price for a one-time market transaction involving near-term delivery of a specified quantity at a specified place. [EIA glossary](https://www.eia.gov/tools/glossary/index.php?id=Spot+price). He said on Saturday evening that a proposed deal would include reopening the Strait of HormuzStrait of HormuzThe narrow waterway between Iran and the Arabian Peninsula that connects the Persian Gulf with the Gulf of Oman and international shipping routes. [EIA](https://www.eia.gov/international/analysis/special-topics/World_Oil_Transit_Chokepoints) and that he would hold off planned strikes if the parties could reach an agreement quickly. Iran's Foreign Ministry said discussions about shipping with Oman were continuing but reopening the strait was not under discussion. An official involved in mediation said no deal had been reached. [Associated Press](https://apnews.com/article/trump-iran-strait-hormuz-israel-gaza-mideast-f4c225f6667d9fd171616304701825a0)

The narrow question is whether public evidence can show that a recovery in physical shipping caused Brent's earlier post-pause declines to persist. It cannot. Public price data establish that Brent was lower after each completed event windowevent windowA defined period before or after an event used to measure how a variable changed. in this analysis. Public shipping releases establish that traffic changed sharply. They do not supply the consistent daily vessel and cargo series, timing information or comparison model required to connect those two observations causally.

The price test begins with the eight dated entries in AP's chronology from April 7 through August 1. We include announcements described as a new strike halt, a ceasefire extension or an agreement to end hostilities. We exclude July 7 because AP describes the United States resuming strikes, the opposite of a pause. Five included events have enough subsequent observations in EIA's daily Europe Brent spot-price series to complete the calculation. July 27 and August 1 do not. [Associated Press](https://apnews.com/article/trump-iran-war-us-canceled-strikes-670f077d2cf5de7614cfce4ad40e4aaa) [EIA](https://www.eia.gov/dnav/pet/hist/RBRTED.htm)

For each completed event, the event-date spot price is the baselinebaselineThe starting value used for comparison, which here is the EIA Brent spot price reported for the event date.. We then count forward to the tenth date for which EIA reports a value, skipping weekends, holidays and missing observations. The calculation asks a modest question: was the later reported price above or below the event-date value? It does not claim to capture the first trading response.

The result is striking but descriptive. Brent went from $138.21 on April 7 to $106.14 on the tenth subsequent observation, a decline of 23.20%. The tenth-observation declines after May 18, June 11 and June 17 were 15.63%, 20.57% and 13.81%. April 21 was the exception to the 5% threshold, but not to the direction: its later price was still 2.30% lower. All prices come from EIA, and all percentages are calculated directly from those reported values. [EIA](https://www.eia.gov/dnav/pet/hist/RBRTED.htm)

First, the baseline may not be a clean pre-announcement price. AP provides exact or approximate timing for some events but not all of them. If an announcement came after the spot assessment was formed, the event-date value may precede the news. If it came earlier, some response may already be embedded in that value. Without consistent timestamps, the same-day baseline cannot measure an immediate market reactionmarket reactionA price change that occurs as traders revise expectations about future supply, demand or risk.. [Associated Press](https://apnews.com/article/trump-iran-war-us-canceled-strikes-670f077d2cf5de7614cfce4ad40e4aaa) [EIA](https://www.eia.gov/dnav/pet/hist/RBRTED.htm)

Second, the windows are not independent experiments. The June 17 event occurs inside the ten-observation window that begins on June 11. Prices during both windows could therefore reflect the same negotiations, attacks, demand news, production changes or reserve decisions. Counting both observations is transparent, but treating them as two independent demonstrations would exaggerate the evidence.

Third, oil prices respond to more than ships passing one boundary. A simple analogy helps: seeing an umbrella open before the pavement becomes wet does not tell us whether the umbrella caused the change. Both may be responses to the same rain. Here, a ceasefire announcement can move traders' expectations immediately, while vessel movements, cargo deliveries and insurance decisions adjust at different speeds.

A causal test would need an estimate of the price path expected without each pause, such as a comparison with other energy prices or a model incorporating demand, inventories, exchange rates and broader market movements. This analysis contains no such control. It therefore separates what can be observed from what cannot be inferred.

Kpler's July 23 release reported an average of about 45 daily Strait crossings from June 7 through July 7, followed by about 13 after conflict resumed. It also reported 9 crossings on July 21 and 15 on July 22. The release describes those figures as daily crossings through the strait. [Kpler](https://www.kpler.com/blog/strait-of-hormuz-crossings-drop-70-as-tanker-traffic-shifts-almost-entirely-to-the-iranian-route)

Kpler's July 31 release used a different label: commodity-related vessels. It reported averages of 9 per day in May, 15 during the first two weeks of June and 33 from June 15 through July 7. It then said the measure fell below 5 on July 22 when calculated as a ten-day moving averagemoving averageAn average repeatedly recalculated over the most recent group of observations to smooth short-lived jumps.. Those figures are useful within that release, but they cannot be appended to the broader crossing figures as though both publications counted the same ships in the same way. [Kpler](https://www.kpler.com/blog/what-the-strait-of-hormuzs-fragile-recovery-signal-means-for-oil-flows-and-prices)

The mismatch matters because a vessel count is not a cargo-volume measure. One large crude carrierlarge crude carrierA high-capacity tanker designed to transport large cargoes of crude oil over long distances. and one small service vessel each add one crossing, even though their economic importance can differ sharply. A daily ship total also says nothing by itself about whether the vessel was loaded, whether its cargo reached a buyer or whether insurers had broadly returned.

Kpler's July 31 interpretation emphasizes expectations. It said Brent had responded more to negotiation headlines than to its tracked flow picture and argued that sell-offs following de-escalation news were larger than the contemporaneous change in physical barrels justified. That is Kpler's market assessment, not a result reproduced by this analysis. [Kpler](https://www.kpler.com/blog/what-the-strait-of-hormuzs-fragile-recovery-signal-means-for-oil-flows-and-prices)

EIA's July Short-Term Energy Outlook offered a different interpretation of the earlier post-agreement decline. It called increased flows through Hormuz a primary source of downward price pressure. EIA also identified several other influences: reduced oil demand, especially in Asia; reroutingreroutingSending oil through a different port, pipeline or waterway when the usual route is unavailable or too risky. by Persian Gulf producers; increased exports from producers outside the Middle East; and releases from government reserves. The report was released on July 7 from a forecast completed on July 1, so it describes the earlier recovery rather than the conditions following July's renewed fighting. [EIA](https://www.eia.gov/outlooks/steo/report/global_oil.php)

The disagreement is not proof that either institution is wrong. They may be describing different periods or different parts of the price adjustment. A headline can lower the risk traders attach to future supply at the same time that additional cargoes ease a present shortage. We cannot measure their separate contributions from the public releases because Kpler does not publish the necessary continuous vessel-level series here and EIA does not publish a causal decomposition of the price move.

S&P Global's Platts report, published in May, asked oil and shipping market participants what would make Hormuz commercially open rather than open only in name. Respondents did not identify one decisive crossing count. They described a bundle of conditions: sustained traffic from diverse operators, broadly available insurance, improved physical security, returning large crude carriers, regular port calls and restored loading programs. [S&P Global](https://www.spglobal.com/energy/en/news-research/special-reports/crude-oil/platts-strait-of-hormuz-defining-open-complex-market)

The numerical ranges were wide. Participants suggested 50%-90% of verified prewar traffic, sustained for between one week and one month, and a post-ceasefire observation period of 30-45 days. These are reported market views, not an official standard. Their breadth reinforces the central point: one political announcement or one busy day cannot establish a durable commercial reopeningcommercial reopeningA sustained return of safe, insurable and commercially acceptable shipping rather than a declaration or isolated vessel crossing. [S&P Global](https://www.spglobal.com/energy/en/news-research/special-reports/crude-oil/platts-strait-of-hormuz-defining-open-complex-market). [S&P Global](https://www.spglobal.com/energy/en/news-research/special-reports/crude-oil/platts-strait-of-hormuz-defining-open-complex-market)

The August 1 event should remain marked pending. AP reported Trump's announcement on Saturday evening, Iran disputed his description of the shipping proposal, and the mediator said no agreement had been reached. EIA's published daily table contained no weekend observation and, as checked on August 2, showed July 27 as its latest reported price. [Associated Press](https://apnews.com/article/trump-iran-strait-hormuz-israel-gaza-mideast-f4c225f6667d9fd171616304701825a0) [EIA](https://www.eia.gov/dnav/pet/hist/RBRTED.htm)

A later update can apply the same price rule after ten subsequent EIA observations are available. The shipping side should be stricter: use one unchanged vessel definition, publish daily values, separate inbound from outbound movement, measure cargo volume as well as ship count and document whether mainstream operators and insurers returned.

Even that would establish sequence and correlation, not causationcausationA relationship in which one factor produces an outcome, rather than merely occurring near it.. A stronger design would compare Brent with other relevant markets, account for simultaneous supply and demand news and specify the model before examining the result. Otherwise, the analysis risks choosing whichever explanation best fits the price move after it is already known.

Brent's EIA spot price was lower on the tenth subsequent observation after every completed pause or agreement in the selected AP chronology, and at least 5% lower after four of the five. That is the strongest supported price finding.

The public record does not show that returning shipping made those declines last. It contains incompatible vessel snapshots, incomplete announcement timing, overlapping events and several plausible alternative influences. The honest conclusion is therefore narrower than either a shipping-driven or headline-driven story: prices fell, traffic changed, and the available public evidence cannot apportion the cause.