Stocks Dip as Iran Conflict Lifts Oil Above $90, Yields to 4.79%

U.S. Treasury yields climbed Tuesday as fresh American military strikes against Iran and an attack on a tanker in the Strait of Hormuz renewed concerns over energy supplies and broader economic fallout. The 10-year note yield rose three basis points to 4.788 percent, its highest level since January 2025. The 30-year bond yield also gained three basis points to 5.279 percent while the two-year note edged up less than one basis point to 4.356 percent.

Traders pointed to the latest round of U.S. strikes and the unexplained attack on the tanker as the immediate drivers behind higher borrowing costs. Oil prices responded quickly, with West Texas Intermediate futures rising more than 1 percent above 87 dollars a barrel and Brent crude advancing more than 1 percent above 92 dollars. Analysts noted that six months of conflict have left no clear route to reopening the Strait of Hormuz, keeping inflation worries elevated at a time when many households already face elevated costs for fuel and goods.

Stock futures reflected the same unease. Contracts tied to the Dow Jones Industrial Average and the S&P 500 each slipped about 0.5 percent in early trading, while Nasdaq-100 futures fell nearly 1 percent. Investors appeared reluctant to extend the solid gains recorded through August, particularly with volatile energy markets and questions over whether the Federal Reserve might delay expected rate cuts or even consider additional hikes. The 10-year yield hovering near 4.75 percent has already pushed mortgage rates and other consumer borrowing costs higher, adding pressure on an economy that has shown resilience but faces mounting external shocks.

Data releases scheduled for the week offered little immediate relief. The Job Openings and Labor Turnover Survey was set to provide a fresh look at hiring and quits, followed later by manufacturing figures from S&P Global and the Institute for Supply Management. Friday’s monthly employment report loomed as the most closely watched release, with traders hoping for clarity on whether labor-market cooling might still allow the Fed room to ease policy despite geopolitical risks.

Corporate earnings continued to trickle in, with Dell and Palo Alto Networks scheduled to report and offer insight into technology spending. Yet market participants appeared more focused on the intersection of fiscal concerns, rising debt issuance tied to artificial-intelligence investments, and the uncertain trajectory of interest rates. UBS chief investment officer Ulrike Hoffmann-Burchardi noted that these factors have kept bonds under sustained pressure even before the latest Middle East developments.

The combination of elevated oil prices and higher yields has left investors balancing double-digit year-to-date equity returns against the prospect of renewed inflation and tighter financial conditions. September’s historically weak seasonal pattern added another layer of caution as traders weighed how long the current round of Middle East hostilities might persist and what further costs it could impose on American households and businesses.