U.S. stock index futures were trading lower on Monday, August 31, 2026, as escalating conflict in the Gulf region pushed oil prices sharply higher, stoking fresh concerns about inflation and the path of interest rates.
As of 07:00 EDT, the last complete snapshot of futures showed the S&P 500 down 0.17%, the Dow Jones Industrial Average futures off 0.18%, and the Nasdaq-100 futures losing 0.13%. The modest declines followed a mixed session earlier, with the Nasdaq-100 having briefly traded in positive territory before turning negative.
The primary driver of the risk-off tone was crude oil. At 06:14 EDT, West Texas Intermediate (WTI) crude for October delivery jumped 3.79% to $86.56 per barrel, while Brent crude climbed 3.69% to $91.35 per barrel. Both benchmarks remained elevated around 07:30, with Brent at $91.19 and WTI at $86.54, confirming that prices stayed above the key $91 level for Brent during the premarket period.
The oil price surge was attributed to renewed military activity in the Gulf. Reports indicated that U.S. forces had struck Iranian missile launchers on Larak Island, and Iran subsequently claimed attacks on U.S. bases in Jordan. This raised concerns about potential disruptions to shipping through the Strait of Hormuz, a critical chokepoint for global oil supplies.
The futures curve reflected these supply worries. At 06:14, the spread between October WTI and June 2027 contracts stood at $12.09, a steep backwardation that signals a strong premium for immediate supply. November WTI was $1.88 below October, December was $4.01 lower, and the June 2027 contract was $12.09 cheaper, underscoring the market's perception of acute near-term supply risk.
Energy equities were expected to benefit from the surge in crude, while technology and consumer discretionary stocks faced the most pressure. The premarket session saw thinner-than-usual liquidity, which could amplify moves in individual names.
Investors were also watching Treasury yields, which have been sensitive to inflation expectations. A hawkish tilt from the Federal Reserve, combined with rising energy prices, has kept rate concerns at the forefront. The next major test will be the 09:30 EDT cash market open, where breadth and the sustainability of the oil rally will be closely monitored.
Analysts noted that the situation remains fluid. A de-escalation in the conflict or confirmation of stable tanker traffic could quickly remove the risk premium from oil prices, while any new military headline could push futures sharply lower. The market is bracing for volatility as trading resumes.
