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Iran Closes Strait of Hormuz — 20% of Global Oil Flow Blocked

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Iran's military command has announced closure of the Strait of Hormuz to vessel traffic, citing alleged violations of a ceasefire agreement by the US and Israel. Iran has separately published formal procedures governing passage through the strait, suggesting the closure is structured rather than improvised. Diplomatic talks between Iran and the US are scheduled to begin in Switzerland, though Iran has framed them as contingent on the other side meeting its obligations first.

Why it matters

The Strait of Hormuz is the single most critical chokepoint in global energy supply — roughly one-fifth of the world's oil and a significant share of liquefied natural gas pass through it daily. A sustained closure drives oil and natural gas prices sharply higher, which feeds directly into inflation, pressures corporate margins, and raises the risk of central banks keeping interest rates elevated for longer. Energy equities stand to benefit short-term while airlines, shipping-dependent industrials, and rate-sensitive assets face immediate headwinds.

Watch next

Switzerland diplomatic talks between Iran and the US (exact date unconfirmed — watch for scheduling announcements imminently). Next FOMC meeting for any emergency commentary on energy-driven inflation. Weekly EIA US crude inventory report for early demand-shock signals. Brent crude spot price daily — the real-time referendum on market belief in the closure's duration.

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