Two categories of fact are tangled together in this story, and they should be held apart. One is a set of claims a government has made about its own actions inside a waterway it has closed. The other is a price that anyone can look up.
Iran said Friday that its forces stopped two vessels seeking to exit the Strait of Hormuz, and that four other tankers turned back after the intervention [1]. Six vessels in total, by Iran's account. Al-Monitor reported plainly that the Iranian reports could not be independently confirmed [1].
The body issuing the account is the Persian Gulf Strait Authority, which was set up by Iran to manage the strait [1]. It said crossings remained "impossible due to continued aggressive actions by U.S. military forces in the region" [1]. That is Iran's characterization of both the cause of the closure and its continuation. The United States is not the source for either half of it.
Independent shipping data tells a partial story that neither confirms nor refutes the claims. Kpler recorded two large oil tankers and two commodities vessels transiting the strait [1]. The same data does not capture vessels moving with their transponders off, which makes it a floor on traffic rather than a count of it [1]. Four observed transits and six claimed interdictions are measurements of different things, and the gap between them is not closed by anything in the public record.
The price is the part that requires trusting no one's account. Brent crude settled near $88 a barrel on Friday, July 31, at $87.93, up $1.05 on the day, a gain of 1.21 percent [2]. Al-Monitor put the same daily move at more than 1 percent [1]. The two accounts agree.
On the month, the record is messier, and it is worth printing in full rather than resolving. The data field at Trading Economics records a July gain of 22.86 percent [2]. Al-Monitor reported Brent on track to rise 23 percent in July [1]. Trading Economics' own prose on the same page describes it as "a nearly 24% gain in July," which does not match the 22.86 percent in its own data [2]. Two of the three agree within rounding, and one outlet disagrees with itself. We print all three and average none of them. The defensible statement is that Brent rose roughly 23 percent in July.
One derived figure makes the month legible. Brent's twelve-month gain is 26.21 percent [2]. A single month of 22.86 percent inside a year of 26.21 percent means the preceding eleven months contributed about 2.7 percent between them, because 1.2621 divided by 1.2286 is 1.027. Essentially the entire year's move in the world's benchmark crude arrived in July. Running the monthly gain backwards from Friday's close implies a July 1 level near $71.57, which puts the month's move at roughly $16.36 a barrel.
The underlying condition is not in dispute even where the vessel count is. Iran has blocked most shipping through the Strait of Hormuz since the conflict began five months ago, and the strait normally carries about one fifth of the world's energy shipments [1].
That is why the price, rather than the vessel count, is the spine of this story. A trader does not need to establish whether two ships were stopped on Friday afternoon in order to price the risk that a fifth of seaborne energy is moving through a contested channel under a closure announced by one of the belligerents. The market is not adjudicating whose account is accurate. It is pricing the possibility that any of them is.
What would move the vessel claims from asserted to established is specific, and it is absent: confirmation from a vessel owner, a flag state or a marine insurer that an interdiction occurred, or transponder records showing a named ship reversing course at a known time. None of that appears in the record we were able to retrieve. Until it does, the six vessels remain Iran's number, reported as Iran's number.
What is claimed is six vessels. What is measurable is $87.93 a barrel and a July of roughly 23 percent.
