• Tanker traffic through the Strait of Hormuz has plummeted by over 90% following recent hostilities, with no major crude tankers transiting since late February.
  • Iranian forces have been hailing vessels to declare the waterway closed, while war risk insurance costs soar, creating a de-facto blockade without formal legal closure.
  • Approximately 240 ships are clustered near the strait, with broader disruptions affecting Suez Canal traffic and Middle East Gulf ports, threatening global energy supply chains.

A Critical Chokepoint Grinds to a Halt

Tanker traffic through the Strait of Hormuz has effectively collapsed, dropping by 92% since hostilities erupted in late February 2026. The dramatic decline reflects a perfect storm of security threats, insurance market paralysis, and commercial shipping decisions to avoid what is normally the world's most critical oil transit route. By March 1, only seven smaller tankers and one gas carrier had transited the waterway by 1800 UTC, compared to 56 tankers the previous Friday before hostilities began. Overall vessel traffic fell 38% on February 28 alone, with just 72 cargo-carrying vessels passing through versus the typical daily average of 107.

What makes this situation particularly alarming is that the main shipping lanes saw zero tanker traffic on March 1, with no crude or product tankers observed arriving to transit the traffic separation scheme channels. "We're seeing a complete evaporation of commercial confidence in the waterway," said one shipping executive who requested anonymity due to the sensitivity of ongoing operations. "The combination of actual security threats and insurance market withdrawal has created conditions where continuing normal operations would be reckless."

The Mechanics of a De-Facto Blockade

Iranian forces have been actively hailing commercial vessels since missile strikes began on Saturday, February 29, declaring the waterway closed in messages described as credible by tanker and security officials. While Iran's foreign minister Abbas Araghchi stated Tehran does not plan to formally close the strait, the practical effect has been identical. At least three commercial vessels were reported hit by projectiles on March 1, according to UK Maritime Trade Operations, confirming the tangible security risks.

Perhaps more impactful than military threats has been the insurance market's reaction. War risk insurance premiums are expected to increase "manyfold," with ships having business connections to the US or Israel likely unable to obtain coverage at any price. "The insurance situation has proven as effective as military closure in deterring shipping traffic," noted a London-based marine insurance broker. "Without coverage, no responsible operator will transit, and we're seeing that play out in real time."

Congestion and Cascading Effects

Approximately 240 ships are now clustered near the Strait of Hormuz, mostly centered around Iran's Bandar Abbas, with about 130 of them laden with cargo. None are carrying crude oil, highlighting how quickly the energy supply chain has been disrupted. Around 750 commercial ships remain inside the Persian Gulf, including approximately 170 container ships totaling 450,000 TEUs (20-foot containers), creating a massive logistical bottleneck.

The blockade is creating cascading effects across global shipping routes. Houthi forces have announced solidarity with Iran, contributing to a reported 12.5% decline in Suez Canal transits, further compounding global shipping disruptions. Middle East Gulf ports are reporting shutdowns and operational chaos as vessels scramble for alternative discharge locations. Crude tankers have been observed clustering near Port Fujairah in the UAE, just outside the strait, as operators seek safer discharge points.

Vessel operators are making routing decisions on a case-by-case basis, with some choosing to wait several days before committing to transit decisions. Crew members may also refuse to transit the volatile waterway, adding human resource complications to the operational challenges. "We're seeing decisions being made vessel-by-vessel based on evolving security conditions, insurance availability, and crew safety assessments," said a maritime security consultant familiar with the situation.

Market Implications and Near-Term Outlook

The Strait of Hormuz carries approximately one-fifth of the world's crude oil, making sustained disruptions potentially catastrophic for global energy markets. While the 38% drop on February 28 was significant, it was not described as an unprecedented low for daily traffic through the strait. However, the complete halt of major crude tanker traffic represents a more severe disruption than typical security incidents in the region.

Shipping activity is expected to remain severely disrupted in the coming days as vessels attempt to clear the congested area. The combination of active threats, insurance unavailability, and commercial pressure suggests sustained suppression of traffic through the strait in the short term. Efforts to reach major shipping companies for comment were unsuccessful, with most citing the sensitivity of ongoing security assessments.

Correction: An earlier version of this article stated that 56 tankers had transited on March 1; this figure actually represents traffic from the previous Friday before hostilities began.