If Hormuz transits have really collapsed into single digits, the question a data-sourcing desk should ask isn’t “how bad is it” but “whose single digits.” The answer: it depends which AIS-derived feed you’re paying for, and that gap is the real story. Kpler’s numbers, cited by Reuters on September 1, 2026, show weekend traffic at five vessels a day, all small tonnage, with a VLCC carrying two million barrels of Qatari crude slipping out with its transponder dark. S&P Global’s MINT and Commodities at Sea data, reported by Oil & Gas Journal for the week ending July 19, 2026, put average daily transits at 13 — and that was already framed as a roughly 50% drop from the prior week’s 248 total transits.
Neither vendor is wrong, exactly; they’re measuring a signal that the tracked population is actively degrading. Ships switching off AIS to dodge Iranian naval mines and unknown projectile strikes — the UK Maritime Trade Operations logged a third attack in a week as of August 31, 2026 — means every commercial vessel-tracking provider is now reporting a floor, not a count. That’s a structural problem for anyone using AIS-based transit data as a proxy for physical oil flows, and it’s why Kpler’s separate estimate of crude exports falling 47% (from roughly 17 million bpd in 2025 to about 9 million bpd by August 2026, per Al Jazeera’s citation of the firm) is arguably more decision-useful than raw transit counts.
When the tracked population is actively evading the sensor, transit counts stop being a market signal and start being a lower bound.
For alt-data buyers, this is a live case study in dark-fleet risk bleeding from sanctions-evasion tracking into mainstream commodity flow analytics — the same AIS-gap problem that dogs shadow-fleet tanker monitoring is now the default condition for an entire chokepoint carrying over a third of global seaborne crude. Watch whether Kpler, S&P, and other vessel-tracking shops start publishing confidence bands or dark-fleet adjustment factors alongside raw transit counts; a vendor that quantifies its own blind spot is worth more right now than one that just reports a lower number.
The number of visible commodity vessels transiting the Strait of Hormuz dropped to five per day over the weekend, shipping data showed on Monday, as companies tread cautiously amid continued attacks on ships. The actual number of ships passing the strait could be higher as some vessels have switched off their automatic identification system to evade attacks.
— Reuters
