Global Bond Yields Resume Climb as US Rates Approach Multi-Decade Highs

Global fixed-income markets sustained losses for a second consecutive week as verbal interventions from Washington failed to quell deep-seated investor concerns over expanding fiscal deficits, hawkish central banks, and persistent energy-driven inflation.

US Yields Retest Highs Despite Intervention

In the U.S., a brief rally in Treasury markets faded, erasing gains that followed an announcement of increased bond buybacks by the Treasury Department. The benchmark 10-year Treasury note yield climbed back toward 4.70%, while the long-bond 30-year yield hovered around 5.25%, nearing the 19-year high of 5.337% set earlier in the week.

An attempt by U.S. Treasury Secretary Scott Bessent to calm markets provided only temporary relief. According to the source material, Bessent suggested that current yield levels were disconnected from fundamentals and hinted that government bond buybacks could exceed the newly announced $4 billion per session ceiling. However, traders largely dismissed the measures as technical support, insufficient to offset structural oversupply and cost-push inflation.

Investor anxiety was further stoked by official data confirming the U.S. national debt has surpassed $40 trillion for the first time. While Bessent reportedly downplayed the milestone, bond investors continue to demand a higher structural term premium to absorb the expanding debt load.

European Bonds Lead Global Sell-Off

European sovereign bonds led the week's sell-off, with borrowing costs across the continent pushed to multi-year highs by sticky regional inflation and heavy primary market supply.

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• The German 10-year bund yield rose to 3.254%, holding near its highest level since May 2011.
• The German 2-year yield increased to 2.841%, as money markets began pricing in a higher probability of a September interest rate hike from the European Central Bank.
• France's 10-year OAT yield stabilized near 4.10% after a new slate of government bond auctions tested institutional demand.

Traders anticipate that Eurozone inflation will remain above the ECB's 2% target for an extended period, partly due to ongoing shipping frictions in the Persian Gulf, a dynamic reflected in a bear-flattening yield curve.

Geopolitical Risks and Supply Pressures Weigh on Markets

The underlying pressure on global rates is compounded by geopolitical tensions and supply dynamics. Disruptions to shipping lanes in the Middle East, along with threats of severe economic sanctions on Iran by former President Donald Trump, have kept Brent crude prices firm near $93 per barrel. This sustained pressure on energy prices, combined with relentless government borrowing in G10 nations, has left bond trading desks in a defensive posture.

Market participants are now looking ahead to the annual Jackson Hole economic symposium for guidance from central bank leaders on whether they will tolerate persistently high long-term borrowing costs or signal future policy adjustments.