Hormuz Tanker Transits Fall to Single Digits as Strait of Hormuz Crisis Deepens

The Quick Take

• Tanker transits through the Strait of Hormuz have collapsed to single digits, representing near-complete disruption of the world's critical oil chokepoint
• The Strait normally carries approximately 20% of global oil supply, making the near-blockage a systemic energy supply shock
• Insurance underwriters have suspended coverage for Hormuz-bound tankers, effectively freezing commercial shipping through the strait

The collapse of Strait of Hormuz tanker transits to single digits represents a historically severe disruption to global oil supply infrastructure. The Strait — a roughly 21-nautical-mile-wide chokepoint at its narrowest — is the maritime passage for approximately 20 million barrels of oil per day, representing about 20% of global petroleum consumption. A near-complete transit freeze at this scale has no precedent in modern oil market history.

The insurance market's withdrawal is the operational mechanism transforming a geopolitical threat into a real supply disruption. Without war risk coverage, no commercial operator will sail through the strait regardless of cargo premiums, effectively creating a self-reinforcing blockade. This insurance market dynamic explains why transit numbers have crashed to single digits even without physical blockage.

The macroeconomic consequences of a sustained Hormuz closure extend far beyond oil prices. Nations dependent on Persian Gulf oil imports — Japan, South Korea, India, and major European economies — face immediate energy security challenges. Central banks will face the uncomfortable combination of oil-driven inflation and growth slowdown. Watch whether US-Iran diplomatic channels can restore confidence in transit safety within days.

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