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European Energy Markets
22APR

Five ships crossed Hormuz in a day

3 min read
14:48UTC

Kpler counted five commodity vessels through the Strait of Hormuz on 16 August. Windward watched four more switch off their transponders on the way out.

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Key takeaway

Hormuz traffic fell to five recorded crossings while four more ships went dark on the way out.

Kpler counted five commodity vessels through the Strait of Hormuz on 16 August, a complete trading day, against 31 across the previous weekend, in data cited by a Reuters wire datelined Singapore 1. The two figures do not cover the same span: one is a single day, the other a weekend, and the underlying collapse is steep enough that the shape holds either way. Weekend transits through the Bab el-Mandeb fell to 49 from 55. Before the war the strait carried more than 130 ships a day. A week ago the trackers were still arguing about which shore the remaining traffic had moved towards . That argument is smaller now, because there is far less left to count.

Windward, a maritime intelligence firm that monitors transponder activity, recorded four outbound vessels going dark on 14 August 2. Going dark means switching off the Automatic Identification System (AIS), the transponder merchant ships are required to broadcast so that other traffic and coastal authorities can see them. The stretches ran from 11 hours to roughly a month. One vessel resurfaced outbound with an estimated 2 million barrels of Saudi crude aboard after about a month unseen, and Bloomberg reported the same day that supertankers are staying dark for longer to move oil out of the region 3.

Those two findings sit awkwardly together. A tracker cannot count a ship that is not transmitting, so Kpler's five is a floor on real movement rather than a measurement of it, and nobody can say how far above that floor the true number sits. The gap matters for the war rather than for freight rates, which belong to another desk: a chokepoint whose traffic is unmeasurable is one where neither Washington nor Tehran can prove what the blockade is actually doing, and both are free to claim it.

Deep Analysis

In plain English

Ships are required to broadcast their position constantly using a system called AIS (Automatic Identification System), the maritime equivalent of an aircraft's transponder. Trackers such as Kpler use that signal to count how many vessels pass through a chokepoint like the Strait of Hormuz, the narrow waterway between Iran and Oman that much of the world's oil must sail through. On 16 August, Kpler counted just five vessels crossing all day, against 31 across the previous weekend and over 130 a day before the war. Separately, four ships switched their AIS off entirely, some for weeks, before reappearing loaded with cargo. Every count of the strait, including Kpler's, can only see ships that choose to be seen.

Deep Analysis
Root Causes

AIS is a self-reported system with no real-time enforcement beyond flag-state law. A master can switch the transponder off at will and face no immediate penalty, so every transit count is a count of voluntary disclosure, not of physical presence in the strait.

The gap between Kpler's five and any true total is exactly the population of vessels that has concluded concealment now costs less than disclosure.

What could happen next?
  • Risk

    Every published transit count, Kpler's five included, undercounts true traffic by an unknown margin, since it can only register vessels still broadcasting.

  • Consequence

    A month-long AIS gap before a tanker resurfaces makes real-time interdiction of any single voyage close to impossible for monitors relying on transponder data alone.

Sources:Reuters (via Al-Monitor)·Reuters (via Al-Monitor)·Windward
Mentions:Kpler →Windward →Strait of Hormuz →Automatic Identification System →Lloyd's List →Washington →Iran →Singapore →Oman →Tehran →Bloomberg →Reuters →Bab al-Mandeb →
First Reported In

Update #171 · A 35-party Iran action, invisible to search

Reuters (via Al-Monitor)· 17 Aug 2026
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Causes and effects
Caused by
Ships with no Iranian tie quit Hormuz
Departing Hormuz traffic already skewed non-Iranian on 12 August; by 16 August the transit count had collapsed further to five vessels a day.
Occurred 11 Aug 2026
Read story →
This Event
Five ships crossed Hormuz in a day
Every transit count for this waterway now measures only the ships that consent to be seen, and concealment has stretched from the crossing itself to the whole voyage.
Led to
One ship or five? Hormuz counts split
S&P Global's one-ship count for 16 August diverges from the commodity-vessel count already reported for that date.
Occurred 15 Aug 2026
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