Global stock markets experienced significant declines on March 21, 2026, largely driven by escalating fears that the ongoing war with Iran will lead to sustained high interest rates. The S&P 500 was on track for its fourth consecutive losing week, marking its longest such streak in a year, falling 0.8%.

The Dow Jones Industrial Average dropped 220 points (0.5%), and the Nasdaq Composite was down 1.3% by midday Eastern time. A major contributing factor to the market’s downturn is the evaporating hope for Federal Reserve interest rate cuts this year.

The conflict in Iran has caused oil prices to surge, with Brent crude reaching $109.54 per barrel, a significant increase from approximately $70 per barrel before the war. The partial closure of the Strait of Hormuz has led to historic energy supply chain disruptions.

Analysts are noting mounting headwinds, including the historical expensiveness of equities and potential turmoil within the Federal Reserve. Some suggest that the S&P 500 could be heading for a correction or even a bear market if the war persists.