Stock Market Today (Sept. 28, 2026): Dow futures slip amid U.S.-Iran tensions, rising oil prices

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Happy Monday. Stock futures were falling as oil prices climbed amid renewed tensions between the U.S. and Iran.

One day after rejecting an Iranian proposal to end the war, President Donald Trump told Axios in a phone interview Sunday that he expects U.S. negotiators to engage in more talks with Iran this week.

“Geopolitical risk will define the start of the new trading week after a stall in diplomatic progress between the U.S. and Iran over the weekend,” said Kyle Rodda, senior financial market analyst at Capital.com.

“Although with some crude trickling out of the Persian Gulf as Iran struggles to maintain control of the Strait — potentially a reason why President Trump is less amenable to striking any sort of a deal with the Iranians — the markets are pricing in a less acute supply shock than at the start of the war.”

Stocks closed higher Friday, driven by a cooldown in oil prices and easing Treasury yields that relieved pressure on Wall Street.

“The markets rounded out the week on a cautiously positive note, supported by a dip in oil prices that took some of the heat out of inflation fears and upside risks to interest rates,” Rodda said.

“Wall Street remains within touching distance of record highs, supported by tech stocks, although the rise on Friday was driven by a boost in energy-sensitive, cyclical sectors.”

He noted that strong corporate fundamentals, along with some signs of a pickup in economic activity in the U.S., are supporting the market.

“That’s proven enough to offset some of the lingering uncertainty from geopolitical risk in the Middle East and global interest rate uncertainty,” Rodda said.

Separately, Nvidia (NVDA) on Monday released two new open-source tools, OpenShell and Nvidia Sentry, designed to help control rogue AI agents.