Major United States stock indexes closed at record levels, lifted by a broad technology sector advance that coincided with reports that negotiators had reached an agreement to extend a ceasefire between the United States and Iran. The S&P 500 rose 0.58 percent to settle at 7,563.63, while the Nasdaq Composite gained 0.91 percent to close at 26,917.47.
The ceasefire extension reports provided a tailwind for equities by reducing near-term uncertainty over energy supply disruptions through the Strait of Hormuz, a critical waterway at the center of the US-Iran conflict. Markets had been trading with a geopolitical risk premium reflecting concerns about further escalation, and even tentative signs of diplomatic progress can relieve that pressure on asset prices across sectors.
Technology stocks led the advance, building on momentum that had been developing in the sector around developments in artificial intelligence and related infrastructure investment. The Nasdaq’s stronger percentage gain relative to the S&P 500 reflected the heavier weighting of technology names in the Nasdaq index and their outsized contribution to the day’s overall gains.
Broader market participation was positive, with gains extending across multiple sectors as the combination of diplomatic news and pre-existing momentum drew buyers into riskier assets. Bond yields moved modestly lower as investors rotated toward equities, reflecting the improved risk sentiment across financial markets.
Analysts cautioned that ceasefire talks have faced multiple reversals since the conflict began, and that sustainable market gains would likely require a more durable resolution to the underlying geopolitical dispute rather than interim extensions that could themselves collapse under renewed tensions.
Created by Ayen Stabel.
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Sources:
https://www.cnbc.com/2026/05/27/stock-market-today-live-updates.html