Report published August 31, 2026
10y JGB Auction Preview: Mizuho Strategy on ASW Longs, 10s20s Steepeners, and Supply Headwinds
Source and citation context
- Issuer
- Mizuho Securities
- Report date
- August 31, 2026
- Analysis as of
- Not stated in source
Authors / editors: Yuhi Kawano
Finvaulta summarizes Mizuho Securities's analysis. Attribute opinions, forecasts, time-sensitive values, and chronology to the issuer and report date; do not treat this page as an independent verification or a current market-data source.
Mizuho previews the upcoming ~JPY2.6 trillion reopening auction of 10y JGB (JB383), advising caution due to BOJ hike speculation, US policy uncertainty, and domestic fiscal spending concerns. For investors looking to participate, 10y asset swap longs and 10s20s curve steepeners offer the most attractive tactical risk/reward.
Key Takeaways
- 1.Ahead of the ~JPY2.6 trillion 10y JGB (JB383) reopening auction, high absolute yield levels approaching 3% and supportive seasonality may attract dip buyers, though caution is warranted.
- 2.Auction demand faces headwinds from BOJ rate hike speculation following above-consensus Tokyo CPI, hawkish Jackson Hole rhetoric pushing USD/JPY back above 160, and reported JPY140 trillion initial FY2027 budget requests.
- 3.For investors seeking exposure, 10y asset swap (ASW) longs offer attractive risk/reward (ranking top in Sharpe ratio) and resilience if OIS rises more than JGB yields, while 10s20s steepeners offer an appealing tactical relative value play and fiscal hedge.
Table of Contents
- (1) Positives and negatives ahead of the 10y auction
- POTENTIAL POSITIVES
- POTENTIAL NEGATIVES
- (2) Auction strategy
- CONSIDER ASW LONGS AND 10S20S STEEPENERS
- (3) Key charts
- Important Disclosure Information
- Analyst Certification
- Disclaimer
Report data
Chart 3.1. Analysis of past performance and rankings by various criteria
| Metric | Estimate | Context |
|---|---|---|
| 10y JGB Auction Planned Size (JB383 Reopening) | 2.6 JPY trillion | Size of upcoming 10y JGB reopening auction. |
| 10y JGB Yield (Closing Level) | 2.925% | 10y simple yield at close on 28 August 2026. |
| Initial FY2027 General Account Budget Requests | 140 JPY trillion | Reported initial budget requests for FY2027. |
| 10y Asset Swap Carry / Vol (Sharpe Ratio) | 8.88 ratio | Ranked #1 among 10y relative value trades based on 6-month carry + rolldown divided by 60-day historical volatility. |
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Strategy Information is shown in chronological order through this edition, published on August 31, 2026.
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Authors / Editors
Reported Data Context
- 10y JGB Auction Planned Size (JB383 Reopening): 2.6 JPY trillion (2026-09-01)
- 10y JGB Yield (Closing Level): 2.925 % (2026-08-28) · Source: Mizuho Securities Fixed Income Research
- Initial FY2027 General Account Budget Requests: 140 JPY trillion (FY2027)
- 10y Asset Swap Carry / Vol (Sharpe Ratio): 8.88 ratio (2026-08-28) · Source: Mizuho Securities Fixed Income Research
Securities
Themes
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