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Global bonds tumble as flaring inflation spooks investors

Published by Global Banking & Finance Review

Posted on May 15, 2026

2 min read

· Last updated: May 15, 2026

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Global Bonds Slide as Inflation and Interest Rate Fears Shake Markets

Bond Markets React to Economic and Geopolitical Pressures

By Amanda Cooper

Rising Yields Amid Inflation Concerns

LONDON, May 15 (Reuters) - The global bond market limped to the end of a bruising week on Friday, as growing evidence of economic damage from the Iran war prompts investors to assume interest rates will rise faster than expected and growth will suffer.  

U.S. Treasury yields hit their highest since in around a year as traders anticipate the Federal Reserve may need to hike rates to rein in inflationary pressures stemming from Iran war-fuelled energy shocks. 

European and Japanese Bonds Under Pressure

German, Italian and French bonds came under fire in early European trading, while Japanese bond yields hit record highs.

Italian 10-year yields surged almost 9 basis points (bps) to around 3.87%, bringing the rise for the week to nearly 14 bps, while benchmark German Bund yields rose almost 6 bps to around 3.11%.

Inflation Data and Market Dynamics

Inflation data this week has shown consumers and businesses are starting to see big increases in price pressures as a result of the war, which has pushed up the price of crude by over 50%.

Two-year yields, which are the most sensitive to changes in expectations for inflation and interest rates, have risen most sharply this week, but yields on longer-dated bonds have started to increase as well, reflecting investors' concern about the longer-running impact from a price shock.

Expert Insights and Policy Expectations

"It's not just inflation, but also higher deficits that should be the focus," Jefferies strategist Mohit Kumar said.

"We are likely to see a number of support measures for fuel subsidies announced in the coming months."

Kumar said he anticipated a steepening bias in government bond curves, referring to a market dynamic in which longer-dated bond yields rise more quickly than those for shorter maturities.

U.S. and UK Bond Market Movements

Benchmark 10-year Treasury notes US10YT=RR were last yielding 4.53%, up 7.3 bps on the day and around their highest since last June.

In the UK, gilt yields have been on a rollercoaster ride this week, hitting their highest in decades, as pressure mounts on Prime Minister Keir Starmer to resign over his Labour party's hefty losses in local elections and potential challengers to his leadership emerge.

(Reporting by Amanda Cooper; Editing by Dhara Ranasinghe)

Key Takeaways

  • US Treasury yields climbed to roughly 4.53%, their highest since June 2025, as markets priced in persistent inflation pressures from energy‑price spikes. (Sources: Reuters; Axios) (investing.com)
  • German, Italian, French and Japanese bonds saw sharp rises in yields amid global growth fears tied to the Middle East conflict and surging oil prices. (Sources: Reuters; IMF; IEA) (en.wikipedia.org)
  • UK gilt yields soared to multi‑decade highs—with 10‑ to 30‑year yields hitting levels unseen since 1998 and 2008—driven by political instability around Prime Minister Keir Starmer and concerns over fiscal sustainability. (Sources: Reuters; Financial News; MoneyWeek) (lse.co.uk)

References

Frequently Asked Questions

Why are global bonds tumbling this week?
Global bonds are tumbling due to investor fears that flaring inflation and economic damage from the Iran war will force central banks to hike interest rates faster than expected.
Which country's bond yields have surged the most?
Italian 10-year bond yields surged almost 9 basis points to about 3.87%, while German and French bonds also saw significant increases.
How has the Iran war affected the global bond market?
The Iran war has spurred energy price shocks, driving inflation higher and raising expectations for interest rate increases, which has negatively impacted bond prices.
What is the outlook for government bond curves according to experts?
Strategists anticipate a steepening bias in government bond curves, meaning longer-dated yields are expected to rise more quickly than shorter maturities.
How are rising bond yields affecting the economy?
Rising bond yields reflect concerns over inflation and potential economic slowdown, affecting borrowing costs and investor sentiment worldwide.

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