$100 Oil Is Sending a Warning Across Global Markets

The return of $100 Brent crude is no longer just an energy story—it's rapidly becoming a global bond market story.

As oil prices climbed above $100 a barrel on Thursday, government bond yields surged across major economies, reflecting growing concerns that central banks may have to keep interest rates higher for longer to contain another wave of inflation.

The pressure is building everywhere.

US long-term Treasury yields have climbed back toward their highest levels since 2007, while Germany's 10-year Bund yield has reached levels not seen since 2011. In the UK, benchmark gilt yields have now closed above 5% for their longest stretch in nearly two decades, and Japanese government bond yields are hovering near their highest levels since the 1990s.

The Bloomberg Global Aggregate Bond Index now offers an average yield of 3.68%—the highest since the 2008 financial crisis.

Higher oil prices are forcing investors to rethink the inflation outlook.

Apollo Chief Economist Torsten Slok warned that rising energy costs have complicated the policy outlook for the Federal Reserve, the Bank of England and the European Central Bank. Combined with resilient US economic data and renewed expectations for another Fed rate hike, bond markets have repriced sharply in recent sessions.

Markets now see roughly a one-in-three chance of a Fed rate hike at next week's FOMC meeting.

The impact is already spreading beyond fixed income.

Higher bond yields are beginning to weigh on equities, with the S&P 500 down around 2% since July 12. Interactive Brokers strategist Steve Sosnick noted that "$100 oil and a 10-year Treasury yield above 4.70% are no longer levels investors can ignore."

Looking ahead, investors are watching whether elevated oil prices prove temporary—or become the catalyst for a broader repricing across global assets.

As Moody's Chief Credit Officer Atsi Sheth put it, markets may already be entering a new regime defined by higher inflation, higher interest rates and wider fiscal deficits.