Markets News, May 27, 2026: Major Indexes Close at Records; Oil Retreats on US-Iran Peace Deal Optimism

The three major U.S. stock indexes—the Dow Jones Industrial Average, Nasdaq Composite, and S&P 500—closed at record highs on May 27, 2026, with gains of 0.4%, 0.1%, and less than 0.1%, respectively. The Dow also hit an intraday record, while the Nasdaq and S&P 500 had set both intraday and closing records the prior day. Micron Technology, which surpassed a $1 trillion market capitalization on May 26, rose an additional 3%, though broader chip stocks underperformed, with Qualcomm and Marvell Technology declining over 4% ahead of earnings. "Optimism over a potential U.S.-Iran peace deal triggered a sharp drop in oil prices, as Iran’s state broadcaster reported a draft agreement could restore prewar shipping levels in the Strait of Hormuz within a month. Brent crude futures fell 5.3% to $94.29 per barrel, while West Texas Intermediate futures dropped 4.8% to $89.40. Meanwhile, Meta Platforms shares climbed nearly 4% after announcing plans to sell subscriptions for enhanced social-media features, though other Magnificent Seven stocks saw mixed results. "Salesforce shares dipped below 1% ahead of its after-hours earnings report, having lost a third of their value since January amid AI-driven software sector struggles. Zscaler’s stock collapsed 32% following a cautious outlook, while Bath & Body Works surged nearly 10% after reporting stronger-than-expected profit guidance. Insulet fell 5% after issuing a voluntary recall for certain insulin pods due to manufacturing issues. "The 10-year Treasury yield slipped to 4.48%, easing mortgage rates, while gold futures declined 1.1% to $4,455 per ounce and Bitcoin dropped from overnight highs above $76,000 to $74,800. The U.S. dollar index rose slightly to 99.19. Boston Scientific became the S&P 500’s worst performer, tumbling 13% after CEO Mike Mahoney attributed a 2026 net sales growth forecast cut to 7%-8.5% to three key factors during a conference presentation.