US Stock Market Sees Decline as US-Iran Tensions Escalate, Brent Crude Prices Surge 8 Percent

US Stock Futures Tumble Amid Renewed Middle East Tensions

US stock futures indicated a negative start to Monday's session, April 20, as a turbulent weekend in the Middle East cast doubt on prospects for peace talks ahead of a looming ceasefire deadline. The risk-off mood weighed on a recent rally that had erased all war-driven losses in US equities.

Futures for the three key indices – the Dow Jones Industrial Average, the S&P 500, and the Nasdaq – were down between 0.4% and 0.5%. The US Navy reportedly carried out its first seizure of an Iranian vessel in the Strait of Hormuz, reigniting tensions in the region. Iran's joint military command reportedly said Tehran would respond soon, termed the US action an act of piracy, and abruptly halted traffic through the waterway less than 24 hours after saying ships could pass.

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Iran also reportedly said on Monday that it has no immediate plans to attend talks with the United States, with the truce set to expire shortly. The S&P 500 on Friday capped a third straight week of gains of over 3% and is on track for its biggest monthly advance since 2020. Since the index hit its 2026 low on March 30, the technology sector has moved from being the worst-performing group in the benchmark to the best. An index tracking the so-called Magnificent Seven technology giants has surged 20% over the same period, reversing a 17% decline from its October peak.

Crude oil prices rebounded in trade as traders turned cautious amid renewed geopolitical tensions in the Middle East. The US benchmark crude rose 7% to $89.71 a barrel, while Brent crude, the international benchmark, gained 8% to $97.50 a barrel, reversing some of the losses from the previous session.

Stocks and sectors in focus today include oil's surge weighing on fuel-sensitive sectors, with American Airlines trading lower as higher crude prices raise concerns over operating costs. Chevron and ExxonMobil are trading higher in premarket, while deal-driven momentum is also visible, with TopBuild surging after a $17 billion acquisition by QXO. AI-linked optimism is offering pockets of resilience, with Marvell Technology gaining on expectations of deeper involvement in AI infrastructure. On the downside, event-driven losses remain sharp, with AST SpaceMobile falling after a failed satellite deployment, while Netflix is among the notable laggards in premarket trading, reflecting broader weakness in growth stocks as yields edge higher.