Iran Standoff Pushes 10-Year Yield to 4.36% on Stagflation Fears

(P1) President Donald Trump’s conflicting signals on Iran have investors preparing for two extreme scenarios, pushing the 10-year Treasury yield to its highest since mid-2025 while oil prices have surged roughly 50 percent since the conflict began. Trump issued an expletive-laden ultimatum for Iran to reopen the Strait of Hormuz by Tuesday evening or face dire consequences, yet also stated he held out “good chance” of a deal.

(P2) "Market nerve is stretched and there is little time left for a binary outcome — a ceasefire or an escalation," Rob Subbaraman, head of global macro research at Nomura, said. He noted that while Trump's tone suggests an urgency to end the war, investors continue to hedge against the risk of a wider conflict.

(P3) The contradictory signals are whipsawing markets. The S&P 500 rallied 3.4 percent last week on hopes of a diplomatic solution, yet the Cboe Volatility Index, or VIX, remains elevated near 24, up from below 20 before the war started on February 28. Shipping traffic through the Strait of Hormuz, which handles nearly a quarter of the world’s sea-based oil trade, remains 95 percent below pre-war levels.

(P4) The month-long closure threatens to trigger a severe global energy crisis and a bout of stagflation, where high inflation is met with stagnant growth. With the deadline looming, a failure to secure a deal could see oil prices spike further, while a breakthrough could unwind the geopolitical risk premium that has sent Brent crude to $109.77 a barrel.

Markets Price in Dueling Realities

Trump’s weekend rhetoric is characteristic of his headline-driven approach, forcing investors to weigh the possibility of a sudden peace deal against a sharp military escalation. On Sunday, he warned on social media that Tuesday would be "Power Plant Day, and Bridge Day, all wrapped up in one," while separately telling Fox News he hoped for a deal by Monday.

"Trump’s escalatory weekend rhetoric is classic Trump: headline-driven, unpredictable and designed to apply maximum pressure, quickly," said Mohit Mirpuri, a fund manager at SGMC Capital. "Markets will need to get used to this style of policymaking as long as he is in office."

Iran rejected the ultimatum, with a military commander calling it a "helpless, nervous, unbalanced and stupid action." Tehran maintains the critical waterway will only reopen after it receives compensation for war damages. The standoff continues as reports suggest a 45-day ceasefire is being discussed with regional mediators.

Bond Vigilantes Re-Emerge as Stagflation Risk Grows

The fixed-income market is taking the inflation threat seriously. The US 10-year Treasury yield climbed to 4.362 percent Monday, up approximately 40 basis points from its pre-conflict level of 3.962 percent, as traders pared back bets on Federal Reserve interest rate cuts this year.

"The bond vigilantes are taking matters into their own hands and tightening credit conditions," said Wall Street strategist Ed Yardeni. He warned that a prolonged blockage of the strait could lead to a bear market or even a recession. The risk is that the energy-driven inflation shock morphs into a growth shock, triggering demand destruction and full-blown stagflation.

Investors are now watching for key US inflation data this week, with the Personal Consumption Expenditures (PCE) index set for release on Thursday. "We are in an event-driven market where headline risk dictates intraday moves and positioning must account for a binary outcome," said Hiroki Shimazu, chief strategist at MCP Asset Management.

This article is for informational purposes only and does not constitute investment advice.