U.S. Strikes Iranian Targets, Sending Oil Prices Sharply Higher

The U.S. military carried out strikes against targets linked to Irans Islamic Revolutionary Guard Corps (IRGC) around midday on September 1, sending oil prices sharply higher and reigniting inflation expectations. Rising crude prices pushed up long-term U.S. Treasury yields, while higher yields weighed on U.S. equity valuations. Gold and Bitcoin also declined as real yields climbed. With tensions between the United States and Iran escalating, all three major U.S. stock indexes posted a third consecutive session of losses, with the Nasdaq falling 1%.

WTI crude settled 5.2% higher at $90.22 per barrel, its highest closing level since July 23, while Brent crude rose 4.6% to $94.65 per barrel. The reaction in refined products was even more dramatic than in crude oil itself. The spread between U.S. heating oil futures and crude surged above $106 per barrel, setting a record high, while retail diesel prices approached $5.63 per gallon. Global refined-product exports have fallen by 6 million barrels per day year over year, a 25% decline, with the Persian Gulf and Russia accounting for 75% of the reduction.

Energy stocks were the only sector to advance, while transportation stocks fell to their lowest level since May. The energy sector ETF gained 1.27%, with major oil producers including Exxon Mobil and Chevron broadly higher. Meanwhile, the Dow Jones Transportation Average dropped 2.51% to its lowest closing level since May, as record-high diesel crack spreads directly drove up freight costs.

The first assets hit by rising interest rates were those with the longest duration, putting AI and software stocks at the forefront of the selloff. The semiconductor ETF fell 2.05% to its lowest closing level in a month, while the software ETF dropped 3.46%. Goldman Sachs broad U.S. AI index declined 1.92%. Companies such as Oracle and Dell came under even greater pressure due to heavy capital expenditures and negative free cash flow. Apple bucked the broader trend, gaining 2.61% on the first day under its new leadership, while Amazon fell after the Federal Trade Commission, joined by 22 states, filed a lawsuit against the company.

Japans 10-year government bond yield climbed above 3% for the first time in three decades, while long-term yields in Germany, France, and the United Kingdom simultaneously reached multiyear highs. The U.S. 10-year Treasury yield rose to 4.792%, its highest level since January 2025, while the 30-year yield briefly touched 5.286% intraday, the highest since June 2007. Options markets are already positioning for the possibility of further increases in interest rates. The August ISM Manufacturing Index came in slightly below expectations, but the Prices Paid Index remained elevated, signaling that cost pressures have yet to meaningfully ease.

The U.S. Dollar Index gained 0.27% to 99.63. Gold fell 2.71% to $4,328.49 per ounce, slipping back below the $4,400 level, as the U.S. 10-year real yield climbed to 2.4320%, increasing the opportunity cost of holding non-yielding assets. Bitcoin declined 1.48%.

The U.S. strikes on Iranian targets have reignited the geopolitical risk premium, while the sharp moves in crude oil and refined products have pushed inflation expectations and long-term bond yields higher, putting renewed pressure on U.S. equity valuations. The market divergence is increasingly clear: energy stocks are benefiting, while transportation and technology shares are bearing the brunt of higher fuel costs and interest rates.

At the same time, the global selloff in sovereign bonds and rising expectations for additional rate hikes suggest that the combination of fiscal and inflationary pressures remains a dominant force in market pricing. In the near term, further developments between the United States and Iran, along with the direction of oil prices, will continue to shape market sentiment. Over the medium to long term, however, the key uncertainty remains the delicate balance among refined-product shortages, rising debt-financing costs, and the Federal Reserves policy path.

Investors should remain alert to the dual transmission mechanism of any further geopolitical escalation: renewed inflationary pressure on one side and downward pressure on asset valuations on the other.

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