US stocks surge as US‑Iran deal lifts energy outlook

US equity indexes jumped on Monday, with the S&P 500 gaining 1.7% and the Nasdaq Composite soaring 3.1% after a tentative agreement between Washington and Tehran signaled a possible end to the Israel‑Iran conflict and a return to steadier energy supplies [2].

The market lift came as oil prices fell sharply; Brent crude slipped nearly 5% to just above $83 a barrel, its lowest level since the conflict began, while U.S. West Texas Intermediate traded around $91. Lower energy costs reduce inflation pressure and give the Federal Reserve more leeway to keep rates steady, a factor that buoyed growth‑heavy stocks [1].

Tech shares led the rally. Nvidia’s CEO Jensen Huang called Friday’s pullback a buying opportunity, prompting investors to re‑enter AI‑related equities. The Nasdaq’s gain was amplified by a 19.6% jump in SpaceX shares after the company’s record‑breaking market debut, which also created the world’s first trillion‑dollar billionaire, Elon Musk [2].

Analysts note that the optimism is tied to the easing of geopolitical risk rather than a fundamental shift in monetary policy. “The war is over, so that side of the argument falls away,” said Jay Goldberg of Seaport Research Partners, highlighting how the removal of the conflict‑risk premium has freed capital for riskier assets [2]. Yet the deal’s practical impact on oil flows will take months, with about 500 vessels still queued at the Strait of Hormuz and lingering concerns over naval mines, according to the International Shipping Chamber [2].

The rally also coincided with a modest dip in Treasury yields, as the 10‑year note fell to 4.51% from 4.55% on Friday, further supporting growth stocks that are sensitive to discount rates [1].

Investors now face the upcoming U.S. consumer‑price report, which will reveal whether the recent energy‑price dip is translating into lower inflation and how the Fed might respond. The market’s next move hinges on whether the tentative cease‑fire can translate into sustained oil‑price stability or if renewed tensions will reignite risk‑off sentiment.