Why did U.S. stock index futures tumble on Wednesday, and what direct statement by President Trump triggered the market reaction?

U.S. stock index futures tumbled sharply on Wednesday because President Donald Trump declared that a memorandum of understanding aimed at ending the war with Iran was 'over', signaling a collapse of diplomatic efforts and raising fears of renewed Middle East escalation. Speaking in Ankara ahead of a NATO summit, Trump stated he had 'no interest in engaging further with Iran', directly undermining the fragile ceasefire between Washington and Tehran and triggering investor concerns about geopolitical risk and supply-chain instability, particularly for oil.

What immediate impact did Trump's remarks have on oil prices and energy stocks, and which specific companies saw notable premarket gains?

Trump's remarks caused oil prices to surge, with Brent crude and U.S. West Texas Intermediate (WTI) crude futures both rising more than 5% on Wednesday. This jump lifted energy stocks in premarket trading: Chevron rose 2.4%, Exxon Mobil gained 3%, ConocoPhillips advanced 2.2%, Devon Energy climbed 2.5%, Occidental Petroleum rose 2.6%, APA Corp surged 4.2%, and Diamondback Energy increased 2.4%.

US Stock Futures Tumble as Trump Says Iran Deal Is 'Over'; Oil Climbs

Jul 8, 2026

US stock futures fell after President Trump ended talks with Iran, escalating Middle East tensions and pushing crude oil prices up over 5%. Major energy companies saw gains as investors reacted to potential disruptions in global oil shipments.

reuters

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