The U.S. Treasury market experienced a significant sell-off on Monday, driving the 10-year yield to as high as 4.76%, surpassing the 4.75% mark and setting a fresh 52-week peak. This move comes as escalating military action in the Middle East reignited concerns over potential disruptions to energy shipments through the Strait of Hormuz, pushing international oil prices higher and amplifying inflationary pressures within the U.S. economy, which in turn solidified market expectations for a September rate hike by the Federal Reserve.

The upward trajectory in Treasury yields is being driven by a combination of geopolitical risk, rising energy costs, and a reassessment of monetary policy tightening prospects. Just last week, Fed Chair Warsh delivered a hawkish message at the Jackson Hole symposium, and the new developments in the Middle East have added another layer of risk, suggesting that energy prices could further fuel inflation. On Monday, the 10-year Treasury yield climbed to 4.76%, its highest level in the past year. For context, the yield had previously broken above 4.75% in January 2025, peaking near 4.8% before retreating. Prior to that, in October 2023, the yield surged to approximately 5%, marking a post-pandemic cyclical high. Since bond prices move inversely to yields, this rapid rise signals that investors are actively dumping U.S. government debt.

This bond sell-off coincides with a sudden flare-up in geopolitical tensions in the Middle East. U.S. forces conducted strikes on two Iranian rocket launchers on Larak Island, located near the strategic Strait of Hormuz, marking the first known American attack on targets inside Iran since late July. This event has rekindled fears that if the military confrontation between the U.S. and Iran escalates further, the Strait of Hormuz—one of the world's most critical energy transit chokepoints—could be affected. Energy markets reacted swiftly to the heightened geopolitical risk. At the time of reporting, U.S. crude and Brent futures were both up approximately 3%. Market participants are worried that any further escalation of military conflict near the strait could disrupt crude supply and shipping routes, potentially driving global energy prices even higher.

For the bond market, rising oil prices translate into a fresh inflation threat. During his address at the Jackson Hole global central bank gathering last week, Fed Chair Warsh emphasized that U.S. price pressures have yet to show sufficient signs of easing. He underscored that the Fed must have full confidence that underlying inflation is moving back toward the 2% target at a clear and sufficiently rapid pace; otherwise, further action would still be necessary. Consequently, the new energy supply risk has made investors more wary that higher crude prices could reignite headline inflation, thereby forcing the Fed to maintain a more restrictive monetary policy stance. This creates a clear transmission mechanism in the market: escalating Middle East tensions heighten concerns over oil supply disruptions, pushing international crude prices up, which in turn intensifies U.S. inflation pressures. Against this backdrop, expectations for additional Fed rate hikes have strengthened, ultimately driving Treasury yields higher.

Meanwhile, short-term Treasury yields, which are more sensitive to Fed policy expectations, remain elevated. The 2-year Treasury yield is currently trading around the 4.35% level. In contrast to the 10-year yield, which has risen sharply due to geopolitical and inflation risks, the 2-year yield has shown relatively limited overall movement but continues to be supported by rate-hike expectations. Following Warsh's remarks on Friday, market pricing for a September rate increase has risen notably. According to the CME FedWatch tool, the probability of a September hike now stands at 63.9%, indicating that a rate increase has become the base case scenario in market pricing. This marks a significant shift from the period before Warsh's speech, when there was considerable debate over whether the Fed needed to tighten policy further. After Warsh stressed inflation risks and noted that current financial conditions are not restrictive, traders rapidly increased their bets on a September move.

Trent Carroll, founder of TA Capital Research, pointed out that the 2-year yield is currently at a technical level worth monitoring. Over the past few years, the 4.35% area has repeatedly acted as a technical resistance level for the 2-year yield. The yield is now trading just below this threshold. Carroll suggests that a decisive break above 4.4% could signal that the market is pricing in another shift in Fed policy, especially amid growing expectations for rate hikes. Given that the 2-year Treasury is typically the most sensitive to federal funds rate expectations, whether this maturity can surpass the 4.4% level may serve as a key indicator for gauging whether the market is further reinforcing its outlook for Fed tightening.