Global bond markets are facing a widespread sell-off as escalating tensions in Iran drive oil prices higher, stoking fears of persistent inflation and forcing investors to reconsider the trajectory of central bank monetary policies.
According to Bloomberg data from Monday, May 18, U.S. Treasuries weakened across the board. The yield on 30-year bonds surged to its highest level in nearly three years as investors braced for the impact of accelerated inflation. This trend was mirrored in Japan, where the 10-year yield spiked 10 basis points to its highest mark since 1996, and the 30-year yield climbed 20 basis points to a level not seen since its 1999 debut. Similar downward pressure on bonds was observed throughout Australia and New Zealand.
The rise in bond yields has weighed heavily on equity markets, cooling enthusiasm after recent record highs. While Asian shares broadly declined by 0.8 percent, South Korea’s Kospi index managed a 1 percent recovery, bolstered by a rebound in Samsung Electronics Co. shares. Despite this isolated strength, stock index futures point to further volatility in Europe and the U.S. Meanwhile, the U.S. dollar, acting as the preferred safe-haven asset during the Middle East conflict, has extended its winning streak for the sixth consecutive day.
Market sentiment remains fragile as Brent crude prices climbed roughly 2 percent to exceed USD 111 per barrel. This gain follows an 8 percent surge last week, fueled by the ongoing stalemate surrounding the critical Strait of Hormuz. Adding to the geopolitical tension, President Donald Trump recently signaled that time is running out for Iran to secure a diplomatic agreement.
Monday’s market volatility is a direct extension of the sell-off seen on Friday, May 15. Investors are increasingly concerned that a sustained closure of the Strait of Hormuz will keep oil prices elevated, ultimately forcing central banks to maintain higher interest rates for a longer duration to combat inflationary pressures.
Looking ahead, the market is laser-focused on the upcoming earnings report from Nvidia Corp. For months, investors have largely overlooked macroeconomic risks, banking on the promise that massive spending on artificial intelligence would continue to drive corporate profit growth. However, the macro environment is becoming impossible to ignore. As Frederic Neumann, Chief Asia Economist at HSBC, noted, “Inflation fears have gripped the global bond market.”
The primary concern for traders is a dramatic shift in Federal Reserve expectations. Markets are now pricing in a near-certain interest rate hike for March—a stark departure from late February, when the consensus anticipated two quarter-point cuts in 2026. Experts at Yardeni Research warn that the Federal Reserve must align its stance with the bond market to avoid losing control over borrowing costs.
“We expect the Fed to hold rates steady at its June meeting before shifting toward a more restrictive policy stance,” stated Ed Yardeni, highlighting the growing pressure on central bankers to respond to the inflationary climate.
Summary
Global bond markets are experiencing a widespread sell-off, driven by escalating tensions in Iran and rising oil prices. Brent crude exceeding $111 per barrel fuels fears of persistent inflation, prompting investors to reassess central bank monetary policies. Consequently, U.S. 30-year bond yields surged to a near three-year high, with similar trends observed in Japan, Australia, and New Zealand. This rise in bond yields has negatively impacted equity markets, though the U.S. dollar strengthened as a safe-haven asset.
The primary concern is that sustained high oil prices, intensified by the Strait of Hormuz stalemate, will compel central banks to maintain higher interest rates for longer. Market expectations for Federal Reserve actions have shifted dramatically, now pricing in an interest rate hike for March, a stark reversal from earlier predictions of rate cuts. Experts warn the Fed must align with bond market realities to control borrowing costs. While investors previously focused on AI-driven growth, macroeconomic risks like inflation are now undeniable.