U.S. Treasury Yields Hit 19-Year Highs Amid Iran Conflict

U.S. Treasury yields climbed to multi-year highs in May 2026, with the 30-year bond peaking near 5.2%, the highest level since 2007. The sell-off was driven by an energy shock following a war with Iran that began 80 days prior, which effectively closed the Strait of Hormuz and pushed oil prices 60% above pre-war levels. These factors contributed to a 3.8% annual increase in consumer inflation for April.

Donald Trump attempted to manage the crisis through diplomatic talks with Chinese President Xi Jinping in Beijing and by pausing planned military strikes against Iran following requests from Gulf allies. Despite these efforts, market volatility persisted. The economic pressure coincided with a leadership transition at the Federal Reserve, as the U.S. Senate confirmed Kevin Warsh to succeed Jerome Powell. Investors anticipate a hawkish approach from Warsh, including significant reductions to the Federal Reserve's $6.71 trillion balance sheet.

The bond rout triggered a broader decline in equity markets, with the S&P 500, Nasdaq, and Dow Jones recording consecutive losses as investors feared rising borrowing costs for mortgages and corporate loans. While AI-driven semiconductor stocks initially buoyed the market, the surge in yields eventually pressured technology shares. Global markets mirrored this instability, with bond yields also rising in Japan and the United Kingdom.