Bond markets around the world extended their recent slide on Wednesday, pushing borrowing costs to levels not seen in years as rising energy prices from the Middle East conflict compounded investor worries about inflation and government debt. The sell-off has lifted sovereign yields to multi-decade highs, with the S. 10-year Treasury yield reaching a near three-year high of 4.81%, according to The Economic Times and The Straits Times.

Japan's 10-year yield climbed above 3% for the first time in three decades, while Germany's 10-year Bund yield was stuck at its highest since 2011, and Britain's equivalent reached its highest since 2008, as reported by Bnn Bloomberg. In Australia, 10-year government bond yields rose to 5.198%, their highest in over 15 years, according to The Economic Times and The Straits Times. German bund futures slipped 0.45% to their lowest since 2011, while French OAT futures fell 0.5% to a record low.

The rise in yields reflects a convergence of factors, according to market analysts. State Street's head of macro strategy, Michael Metcalfe, noted that climbing energy prices have prompted traders to bet on rate hikes, pushing up short-dated yields. He also highlighted longer-term concerns about fiscal trajectories, particularly in France and the UK where budget news is expected soon. "There are not many positives out there," Metcalfe said.

Charu Chanana, chief investment strategist at Saxo, said bond investors are increasingly demanding a higher premium for inflation, fiscal risks, and the sheer volume of debt coming to market. She warned that the sell-off could overshoot, with 5% on the S. 10-year looking increasingly plausible before yields become attractive enough to draw buyers back.

Oil Prices and Rate Hike Expectations

The Middle East conflict has driven up oil prices, feeding into inflation concerns. Brent crude futures rose 1% to $95.61 per barrel on Wednesday, after gaining nearly 6% in the previous session, following strikes between the S. and Iran, as reported by Bnn Bloomberg. This has heightened expectations of central bank action. The Economic Times reported that traders have priced in a rate hike in Europe next week and about a 68% chance of a S. rate hike the following week. Bnn Bloomberg noted that Federal Reserve Chair Kevin Warsh triggered a sharp rise in bets on a September rate hike with a hawkish speech last week in which he acknowledged insufficient progress on inflation.

Tech Bond Issuance and Fiscal Pressures

The sell-off has been exacerbated by a wave of bond sales from big technology companies aggressively raising capital to fund AI-related investments. Naka Matsuzawa, chief macro strategist at Nomura Securities in Tokyo, said so-called hyperscalers' willingness to pay reasonably high rates was pulling up yields across the board. He noted that the focus now is on whether growth can rise along with those rates, and whether the AI-driven productivity leap translates into higher wages, which would allow economies to cope with higher rates.

The rising yields have also put a spotlight on governments with ambitious spending plans. The Economic Times and The Straits Times reported that Japan's Prime Minister Sanae Takaichi's aggressive investment plan has come under scrutiny, as have the fiscal stances of Britain, France, and Germany, where creditors are delivering a reality check. Rising JGB yields reflect investor concerns over Japan's fiscal outlook and global pressure on long-term funding costs, according to analysts cited in the reporting.

Sovereign yields serve as a reference point for asset prices across financial markets, and the higher cost of money translates into higher mortgage rates for consumers and difficult choices for governments as their funding costs climb. The 2-year S. Treasury yield also rose to 4.41%, its highest level since January 2025, according to The Economic Times.