When the Tokyo Stock Exchange first asked Prime-listed companies to "disclose their plans" for trading below book value in early 2023, the consensus reaction was that nothing structural would change. Three and a half years later, the share of Prime constituents trading below one times book has fallen from roughly half to under a fifth, and the conversation inside Japanese boardrooms has shifted from whether to address capital efficiency to how aggressively to do so.
Key takeaways
- The Prime market sub-PBR cohort has shrunk from roughly 50% to under 20%.
- Topix buyback authorisations are running at record levels.
- Cross-shareholding unwinds have accelerated.
- The discount to global developed peers has compressed meaningfully.
How the campaign actually worked
The TSE's enforcement mechanism was reputational, not legal — public disclosure of the under-performing cohort, peer comparison, and a visible "comply or explain" trail. That worked in Japan because the social cost of being on the list was high.
- Buyback announcements: at multi-year highs
- Cross-holding sales: accelerated meaningfully
- Dividend progressivity: more widely adopted
- Activist-friendly responses: more common
What it did to valuation
The Topix forward earnings multiple has converged toward developed-market peers, the discount narrowed but not fully closed. The remaining discount is a quality and growth discount, not a governance discount.
Where the next leg comes from
The Standard market — one tier below Prime — is now the focus of the TSE's attention.
What could reverse it
A return to deflation and a flight to defensive holding patterns would undo some of the cultural shift, but not the disclosure regime itself.
Prime market: share of constituents trading below 1x PBR
| Period | Share below 1x PBR |
|---|---|
| End-2022 | ~50% |
| End-2023 | ~40% |
| End-2024 | ~30% |
| End-2025 | ~22% |
| Mid-2026 | ~18% |
Three years of nudging did more than two decades of governance code revisions.
Frequently asked questions
Is this a Korean-style program?
Korea explicitly copied it; the sequencing is the same.
Has the discount closed?
Compressed meaningfully, not closed.
Where does the focus shift next?
To the Standard market.
The bottom line
The TSE's quiet campaign delivered what loud reform efforts could not. The Prime market has been re-rated and the cultural shift is now self-reinforcing.
