After the Japanese Stock Market's New High: Cross-Shareholding Governance, Market Breadth Contraction, and TOPIX Repricing
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- Summary of Full Content
- In a nutshell: Japan still has upside potential, but you can no longer blindly buy the index
- 1. Why Cross-shareholding Still Matters
- 2. Why New Index Highs Raise Concerns
- 3. AI Hardware Remains Strong, But You Can’t Rely on Storytelling Alone
- 4. Valuation Still Has Room, But the Safety Margin Is Shrinking
- 5. Capital Flows: Domestic Institutions Are Buying, Foreign Investors Haven’t Stepped In
- 6. Sector Positioning: Buy Where Valuation Can Be Justified
- 7. Momentum Clock: The Further You Go, the More Selective You Need to Be
- 8. Under What Circumstances Should the Japan View Be Downgraded
- Conclusion: After New Highs in Japan, the Key Is to Switch from Index Trading to Structural Trading
- Main References
After Japan's Stock Market Hits New Highs: Cross-Shareholding Governance, Market Breadth Contraction, and TOPIX Revaluation
Summary of Full Content
For Japan’s stock market this time, the most important factor is not that the Nikkei 225 broke through 70,000 points and TOPIX surpassed 4,000 points. The more valuable question is: now that it has reached this level, can Japan still be bought? And should you buy the index or focus on structure?
In my view, the Japanese market has not yet reached the end of its rally, but the most comfortable period of low-valuation rerating has already passed. The 12-month forward PE of TOPIX is about 16.7 times, around +1.7 standard deviations since 2015; P/B is about 1.8, close to +3 standard deviations. On the index level, it's no longer cheap. More troubling is that market breadth is narrowing: the proportion of TOPIX constituents above the 200-day moving average has dropped from over 85% in October 2025 to less than 50% now. This indicates that new highs in the index are not broad-based, but instead being driven by a small number of heavyweights and high-conviction themes.
However, Japan is not simply a high-risk proposition at elevated levels. The cross-shareholding governance theme is still playing out: from July 2025 to June 2026, cross-shareholding selection portfolios have outperformed TOPIX by more than 40 percentage points. AI hardware, electronic components, semiconductor equipment, and factory automation are still contributing to profit flexibility. Going forward, Japan looks more like a structural market: the index still has a 12-month 4,400 point target given by GS, about 9% upside; the real difference in returns will come from governance delivery, earnings quality, and whether market breadth can improve.
In a nutshell: Japan still has upside potential, but you can no longer blindly buy the index
TOPIX closed at 4,045 points, up 4.2% for the week; Nikkei 225 closed at 71,250 points, up 7.9% for the week. This is significant strength, but strength does not mean no risk.
Three things are simultaneously true in the current Japanese market. First, AI hardware and export manufacturing are still driving the index. Second, cross-shareholding governance reforms are still providing rerating potential for value stocks and assets improving capital efficiency. Third, market breadth has clearly contracted, making the rally increasingly reliant on a handful of strong segments.
Disclaimer: The content of this article solely reflects the author's opinion and does not represent the platform in any capacity. This article is not intended to serve as a reference for making investment decisions.
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