Iran Closes Strait of Hormuz Again Over Israeli Strikes on Lebanon

Iran says it is closing the Strait of Hormuz again, citing Israeli airstrikes on southern Lebanon as a breach of its newly signed memorandum of understanding with the United States. The move comes just days after the waterway reopened, and lands right as U.S. and Iranian negotiators head to Switzerland for nuclear talks.

What Iran announced

The Iranian armed forces announced Saturday they will close the Strait of Hormuz — just three days after it reopened — alleging America’s failure to rein in Israeli attacks on Lebanon violates the new ceasefire deal.

Iran’s central military command officially ordered the strait closed, reversing a decision made less than 48 hours earlier to open the shipping lane and waive transit fees. Tehran cited continuous U.S. and Israeli violations of the new peace agreement, pointing to a wave of Israeli airstrikes in southern Lebanon that killed at least 16 people on Saturday.

The Revolutionary Guard Corps warned international ships to stay away, declaring the passage closed to all vessel traffic and stating that any ships attempting to approach would be putting their security at risk.

Washington pushes back

U.S. Central Command countered shortly afterward that commercial ship traffic in the strait actually increased Saturday. “Iran does not control the Strait of Hormuz. Traffic continues to flow, and U.S. forces are monitoring the situation to ensure this remains the case,” CENTCOM spokesperson Capt. Tim Hawkins said, adding that the U.S. military has not tracked any movement from Iran to close the strait.

CENTCOM said 55 merchant ships transited the waterway on Saturday, moving large amounts of cargo and more than 17 million barrels of oil to global markets. Vice President JD Vance downplayed the announcement, stating that U.S. officials have yet to see any physical evidence on the water proving the strait is blocked.

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Why it matters for markets

The U.S.-Iran memorandum of understanding included opening the Strait of Hormuz, through which 20% of the global oil supply passes. A real closure, even partial, puts a tail risk back on crude, tankers, and defense.

This is the first big crisis between the U.S. and Iran since signing the memorandum of understanding to end the war earlier this week, and it lands as President Trump’s envoys are already in Switzerland ahead of a potential first round of nuclear negotiations.

President Trump warned Saturday that the United States could impose tolls on the Strait of Hormuz waterway if negotiators fail to finalise a deal to end the war in Iran.

Trump’s 60-day toll threat

In a social media post Saturday, President Trump threatened to impose U.S. tolls in the strait if a final deal with Iran isn’t reached within 60 days. The current agreement establishes toll-free travel through the strait for 60 days. Trump did not address Iran’s assertion that the waterway is closed.

For traders, the read is simple: headline risk is back on, but physical flows have not actually stopped yet. The gap between rhetoric and reality is where the volatility lives.

Options market and stocks to watch

A few names to keep on the radar as the Hormuz headlines develop:

• USO — the U.S. Oil Fund is the cleanest proxy for crude. Watch for any confirmed disruption to tanker traffic to push WTI premiums into the contract.
• XLE — broad energy ETF. Watch for flow into majors if oil bids on supply-shock fear.
• XOM — Exxon is the largest-weighted integrated. Watch for call sweeps on any escalation headline.
• CVX — Chevron has direct Middle East exposure. Watch for IV expansion alongside crude.
• LMT — defense bid often returns on Iran-Israel headlines. Watch for relative strength versus the tape.

For more, check other news on the macro and geopolitical tape.

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