Markets Whipsaw as Strait of Hormuz Reopens and Closes Amid Iran War Ceasefire Uncertainty

Neutral (0.1)Impact: High

Published on April 20, 2026 (3 hours ago) · By Vibe Trader

Investor sentiment has swung sharply in response to developments in the Iran war, with analysts warning that markets may be misreading the situation. Following a two-week ceasefire agreed between the U.S. and Iran on April 7, optimism over an end to hostilities in the Gulf region propelled equities higher. Tehran's announcement on Friday that the Strait of Hormuz was open to shipping triggered a strong market rally, with the S&P 500 gaining 4.5% last week and the Nasdaq Composite surging 7.2%. The Nasdaq also achieved its 13th consecutive winning session on Friday, a streak not seen since 1992 [1].

However, this optimism proved short-lived. On Monday, global equity markets reversed gains as traffic through the Strait of Hormuz once again halted, following Iran's announcement of its closure the day after reopening. The fragile ceasefire is set to expire on Tuesday, adding to market uncertainty. Analysts from Deutsche Bank and BCA Research cautioned that investors risk repeating the mistakes of 2022, when misplaced optimism about the Russia-Ukraine war's end led to significant equity declines [1].

Matt Gertken, chief geopolitical strategist at BCA Research, emphasized that the current situation differs from previous market responses to U.S. President Donald Trump's actions, noting that Trump is not fully in control of events in the Middle East. Gertken stated, "The market is believing this is like 'liberation day' – that President Trump can raise the temperature but then lower the temperature at the perfect time, and that he's the maestro. But we could be in a different situation now, because Iran has been attacked, and they have a higher pain threshold" [1].

Patrick O'Donnell, chief investment strategist at Orbis, highlighted that the resumption of uninterrupted energy flows through the Strait of Hormuz is critical for any sustained stock market recovery. He warned that the ramifications of the conflict in the Middle East could have a long-lasting effect on the global economy and markets. The article also notes that President Trump has yet to secure guarantees on Iran's nuclear capabilities, which remains a key issue [1].

CONCLUSION

Markets have reacted with volatility to shifting news about the Strait of Hormuz and the Iran war ceasefire, with analysts warning that investor optimism may be premature. The situation remains fluid, and the potential for long-lasting economic and market impacts persists as the ceasefire's expiration approaches and energy flows remain uncertain.

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