Idemitsu Maru first Japan-linked tanker to cross Hormuz since conflict began

The Idemitsu Maru, loaded with Saudi crude, has crossed the Strait of Hormuz, making it the first Japan-linked crude tanker to navigate the strait since the conflict began. The Strait of Hormuz Traffic Normalization by April 30 market is likely to react to this development.

Market reaction

The Idemitsu Maru carried 2 million barrels of Saudi crude through the strait, where daily crossings had dropped from 125–140 to just two per day. The Strait of Hormuz Traffic Normalization by April 30 sub-market remains unresolved. The Strait of Hormuz Traffic market, set to resolve by the end of May, has 37 days remaining. The strait carries about 21% of global petroleum liquids consumption.

The US escorts through Hormuz by April 30 market sits at just 2% YES, unchanged by this crossing. There is no indication of US Navy activity related to the Idemitsu Maru‘s transit. USDC volume in the US escorts market over the last 24 hours was $1,276, with $732 depth to move prices 5 percentage points, meaning even modest trades can move this market. The lack of movement reflects skepticism about any imminent military escort operations.

Why it matters

This is the first successful transit by a Japan-linked crude tanker since Iran tightened control over the strait. If it signals a shift in Iran’s approach rather than a one-off exception, it changes the probability calculus for normalization markets. The gap between current daily crossings (two) and pre-conflict levels (125–140) remains enormous, so a single transit is far from normalization, but it breaks a pattern.

What to watch

Whether additional tankers follow the Idemitsu Maru in the coming days will determine if this is a trend or an isolated event. Watch for announcements from the IRGC and Iran’s Foreign Ministry on any changes to the toll or permit regime. Shipping line updates from Maersk or Hapag-Lloyd on resuming full Gulf services would also signal a broader shift. At current odds, buying YES on normalization by April 30 offers a high payout if the trend continues, but the timeline is tight.

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