Stock Market Today, Sept. 1: Stocks Slide and Oil Surges Amid U.S.-Iran Tension

U.S. equities sold off September 1, 2026, as escalating U.S.-Iran tensions sent crude oil 5% higher and pressured risk assets. The S&P 500 dropped 0.71%, the Dow fell 0.79%, and the Nasdaq declined 1.03%. Technology stocks led losses, with growth names underperforming value equities as Treasury yields climbed alongside the oil spike.

The session marked a clear risk-off rotation. Oil's surge added inflationary pressure while higher yields compressed valuations in rate-sensitive sectors. Growth stocks bore the brunt, underperforming value by a measurable margin as investors fled duration risk.