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Mizuho Securities

June 10, 2026

30y JGB Auction Preview

Rates StrategyRates Govt BondsOther

This report provides a preview for the upcoming 30y JGB auction, identifying fiscal policy concerns as a headwind while noting that limited BOJ terminal rate upside makes the sector attractive for medium-term holding.

Key Takeaways

  • 1.The 30y JGB market faces downward pressure from fiscal concerns, particularly government plans for 'bridging bonds' and tax rate adjustments, creating near-term volatility.
  • 2.Market pricing of the BOJ's terminal policy rate near the top of the neutral range (2.5%) limits scope for further hawkish repricing, potentially increasing the relative appeal of super-long bonds.
  • 3.Despite near-term volatility, there is limited room for super-long yields to climb over the medium term due to the MOF's debt issuance strategy and potential inflation cooling.

Table of Contents

  • Positives and negatives ahead of the 30y auction
  • POTENTIAL POSITIVES
  • POTENTIAL NEGATIVES
  • Auction strategy
  • 30Y ASSET SWAPS AND/OR OUTRIGHT LONGS WITH A MEDIUM-TERM HORIZON
  • Key charts
  • Important Disclosure Information
  • Analyst Certification
  • Disclaimer

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