Iran tensions send Treasury yields soaring—what it means for markets
Bond markets are showing fresh signs of strain as tensions in Iran push up Treasury yields. The 10-year yield has climbed sharply, raising concerns about inflation and oil prices. Before the conflict, yields had actually fallen to an 18-month low. The recent spike in yields follows a pattern seen in past years. When 10-year Treasury yields stayed above 4.5% for over a month, stock markets often weakened. Between September and November 2023, yields at that level coincided with a 5% drop in equities, hitting a yearly low in late October.
A similar trend appeared in late 2024 and early 2025. Yields remained elevated for two months, and by April, the S&P 500 had fallen to new 52-week lows. Earlier in 2024, from April to May, a shorter period of high yields still led to a 4% pullback in the index.
While the 30-year yield is now at multi-decade highs, some analysts suggest this could be temporary, driven by war-related uncertainty. The current rise in yields is seen as a warning sign rather than a full crisis. Previous episodes did not cause lasting harm, and the broader bull market remains strong, with earnings up by 27.7%. The timing of any market recovery may hinge on how long bond yields stay high. Investors are watching closely for signs of stabilisation. For now, the economic backdrop remains supportive, but risks from prolonged yield pressure persist.
