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Mizuho Securities

May 27, 2026

40y JGB Auction Preview

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Mizuho previews the upcoming JPY 300bn 40-year JGB auction, suggesting that high absolute yields (>4%) and supportive seasonal cycles favor outright long positions despite geopolitical and fiscal uncertainties.

Key Takeaways

  • 1.The Ministry of Finance (MOF) is set to auction approximately JPY 300 billion of the new 40-year JGB (JU19), with supply halved since March 2025.
  • 2.Current 40-year yield levels exceeding 4% are viewed as attractive given Japan's estimated 0.5% potential growth rate.
  • 3.Historical seasonality in late May tends to be supportive for 40-year JGB auctions as duration extension trades offset early-month upward pressure.

Table of Contents

  • Positives and negatives ahead of the 40y auction
  • POTENTIAL POSITIVES
  • POTENTIAL NEGATIVES
  • Pre-auction comment²
  • OUTRIGHT LONGS
  • Important Disclosure Information
  • Analyst Certification
  • Disclaimer

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