Why you should care about rising bond yields

As we enter September, a month historically known for its market volatility, an alarming trend is emerging in the bond markets that should cause concern for all investors. On the first day of September 2026, global bonds are experiencing a widespread sell-off of unprecedented ferocity, which could alarm even seasoned investors. The yield on the 10-year US Treasury note, a critical interest rate that affects everything from mortgages to credit card rates, has reached its highest level since January 2025.

This development is particularly troubling as bond yield creep is occurring globally. Japan's 10-year bond yield has surpassed 3% for the first time since 1996, while British 10-year yields have hit their highest level since mid-2007, and German 10-year bonds are at levels last seen during the European debt crisis peak. Major US stock averages have fallen in response, but stocks have historically managed to ignore these bond market shifts.

However, these recent movements suggest a significant loss of confidence in governments' abilities to manage debt, control inflation, and maintain fiscal stability. The correlation between bond yields and stock market performance varies depending on whether the market is focused on inflation or growth. While lower yields generally support stock valuations, a sudden decline in yields can signal deteriorating corporate earnings.

Therefore, the current surge in bond yields is not just a concern for bond investors but a clear warning sign for the broader financial market and economy.