On March 30, 2026, financial markets were dominated by the ongoing U.S.-Iran conflict, which led to the closure of the Strait of Hormuz and a significant tightening of global energy supply. As a result, WTI crude oil prices surged above $101 per barrel, reflecting heightened geopolitical risk and supply concerns [1]. U.S. President Trump issued a warning that if Tehran does not re-open the Strait of Hormuz, the U.S. will target civilian energy infrastructure, further escalating tensions [1].
The session saw a sharp reversal in the Treasury market, with 10-year yields moving notably lower after Federal Reserve Chair Jerome Powell delivered measured remarks at Harvard University. Powell stated that inflation expectations appear to be 'well anchored beyond the short term,' which redirected market focus from inflation fears toward concerns about second-order growth risks [1]. This shift in sentiment contributed to equities giving back strong overnight gains, as chipmaker weakness and geopolitical unease dragged the S&P 500 into negative territory by the close [1].
In currency markets, the U.S. dollar finished as the second-best performing major currency, trailing only the Japanese yen. The yen drew support from an escalating verbal intervention campaign by Tokyo officials, including a warning from Bank of Japan Vice Finance Minister Mimura about 'decisive' action against speculative yen moves [1]. The Bank of Japan's latest Summary of Opinions indicated a gradually hawkish bias, with policymakers emphasizing vigilance over yen weakness and inflation risks, and keeping the door open to further interest rate hikes as normalization continues [1].
Key economic data released included Swiss KOF Leading Indicators for March at 96.1 (below the forecast of 102.2 and previous 104.2), U.K. net lending to individuals at 6.8B (above forecast and previous), and euro area economic sentiment at 96.6 (slightly above forecast but below previous). Germany's preliminary inflation rate for March showed 1.1% m/m (above forecast and previous) and 2.7% y/y (above forecast and previous). The U.S. Dallas Fed Manufacturing Index for March came in at -0.2, missing the forecast of 0.7 and previous 0.2 [1].
Overall, the market narrative was shaped by the inflationary impulse from surging oil prices and the mounting concern that prolonged disruption to energy supplies could weigh heavily on global economic growth. Powell's comments appeared to tip the balance toward growth concerns during the U.S. session [1].
CONCLUSION
The closure of the Strait of Hormuz and escalating U.S.-Iran tensions drove oil prices sharply higher, intensifying inflation concerns. However, Federal Reserve Chair Powell's remarks shifted market focus toward potential growth risks, leading to lower Treasury yields and a negative equity close. The market remains highly sensitive to geopolitical developments and central bank signals.