The Tradable-Share Ratio: the one number that reshaped Japanese cross-shareholdings

TL;DR - In April 2022, TSE quietly rewrote the definition of "tradable shares" (ryūdōkabu / 流動株): under the new rule, shares held by Japanese banks, insurers and business corporations are excluded from "tradable" regardless of stake size, treating cross-shareholdings as illiquid even at 0.1%. - That redefinition, combined with the 35% Prime tradable-share-ratio continued-listing threshold, transformed a technical liquidity metric into the most powerful single tool for dismantling Japan's cross-shareholding system — without ever using the word "prohibition." - For founder-controlled and group-controlled Prime issuers, the tradable-share ratio is the most binding criterion in practice. Buybacks of strategic-holder stakes, share consolidations, secondary offerings, and TOBs by founding families are all downstream consequences of this one definitional change.

What the tradable-share ratio is, and what it used to be

Every TSE listing-maintenance regime since the 1990s has had some concept of "tradable" or "floating" shares — a calculation designed to measure how much of a company's equity is actually available for trading in the market, as distinct from blocks held by insiders or long-term strategic shareholders. The continued-listing criteria for all three new TSE segments — Prime, Standard, Growth — use this measure twice: once as an absolute market-cap test (tradable-share market cap ≥ JPY 10 bn for Prime, ≥ JPY 1 bn for Standard, ≥ JPY 500 m for Growth) and once as a ratio test (≥ 35% for Prime, ≥ 25% for Standard and Growth).

The metric had existed in some form since the pre-2022 1st Section regime, but the 2022 redefinition is what gave it teeth. The change is best understood as a series of carve-outs from the "tradable" pool. Under the new TSE definition, the following are excluded from tradable shares:

1. Shares held by the top ten largest shareholders (with limited exceptions).
2. Shares held by directors and officers, and by parties related to them.
3. Treasury shares held by the company itself.
4. Shares held by other special parties (e.g., subsidiaries and affiliates that hold parent shares).
5. Shares held by Japanese banks (depositary institutions) and insurance companies — regardless of whether they appear in the top ten.
6. Shares held by business corporations that hold the issuer's stock as part of a strategic or business relationship — regardless of stake size.

It is the fifth and sixth carve-outs that did the heavy lifting. Before 2022, a regional bank holding 1.2% of a listed company's shares — a textbook small "strategic" stake left over from a 1990s business relationship — would have been part of the tradable-share pool unless that bank happened to be in the top ten. After 2022, it is non-tradable, full stop. The same applies to a Toyota-group company holding 0.8% of a small supplier, or an insurer holding 2% of a long-term policyholder partner.

OLD vs NEW: the definitional shift in one table

The "same headline number, much harder test" framing is the key analytical move. Many overseas commentators in 2022 looked at the 35% Prime threshold and thought "that's not very different from the 1st Section's 35%." That reading missed the point. The percentage is the same; the denominator and numerator have been rewritten so that holdings counted as "tradable" under the old rule are now counted as "locked." A company that was comfortably over 35% in March 2022 could find itself below 35% on day one of April 2022 — without a single share changing hands.

Why this is the most binding criterion in practice

Among Prime's quantitative continued-listing tests — tradable-share market cap ≥ JPY 10 bn, tradable-share ratio ≥ 35%, ≥ 800 shareholders, ≥ 20,000 trading units, daily average trading value ≥ JPY 20 m — the tradable-share ratio is the one most founder-controlled and group-controlled issuers fail. Three reasons:

First, market-cap and trading-volume tests are largely a function of price and float arithmetic. A company can address a failing tradable-share market cap by either market-cap appreciation (improve fundamentals, do buybacks, raise PBR) or by tradable-share count increases (secondary offerings, share consolidations of strategic-holder stakes). These are conventional capital-markets actions.

Second, the shareholder-count and trading-unit tests are addressable through retail-distribution measures — secondary offerings to retail, share splits, etc.

Third, the tradable-share ratio is governed by the structure of the shareholder base itself. It does not care about share price. It does not care about trading volume. It cares only about who owns the shares. For an issuer whose top shareholders include a founding family, a parent company, a network of group affiliates, a main bank, a long-relationship insurer, and a handful of business-relationship corporates, the ratio cannot be fixed by issuance or buyback alone — it can only be fixed by changing the identity of the shareholders.

That structural fact is what made the 2022 redefinition the single most consequential change in Japanese capital markets in a decade.

The corporate actions the rule has triggered

By 2025, the menu of corporate actions taken by Japanese listed companies to address tradable-share-ratio failures had become familiar enough to be tracked as a category. The pattern:

• Buybacks of strategic-holder stakes. The issuer buys back its own shares from a strategic-holder corporate or insurer. The shares become treasury (still non-tradable), but the denominator shrinks, lifting the ratio. Often paired with cancellation to make the lift permanent.
• Strategic-holder dispositions in the open market. The cross-holding bank or insurer sells its stake in the open market or via secondary offering. The shares move from "non-tradable" to "tradable," lifting the ratio. The 2010 and 2018 CG Code revisions have made this disposition pattern increasingly common; the 2022 ratio rule accelerated it.
• Share consolidations followed by secondary offerings. The issuer consolidates founder/strategic holdings (using internal restructuring or holding-company transactions) and then sells the consolidated block into the market through a secondary offering — converting non-tradable shares into tradable in one transaction.
• Migration from Prime to Standard. For companies where the structural shareholder base cannot economically be unwound, a voluntary segment transfer to Standard (with its 25% threshold and JPY 1 bn tradable-share market-cap floor) is the simplest answer.
• MBO / TOB by founding family or PE. Where Prime-listing is no longer worth the constraint, founder-led MBOs (sometimes with PE financing) take the company private. These have spiked in 2024-2025 — see Theme 5.4 for the MBO/Takeover Guidelines context.

A worked example of the arithmetic

Consider a hypothetical mid-cap Prime issuer with the following pre-2022 cap table:

Under the old definition, this company had a comfortable 63% tradable-share ratio — far above the 35% Prime bar. Under the new definition, the same shareholder base yields 54% — still above 35%, but with materially less headroom. A small adverse change in the cap table (a few percentage points of new strategic-holder accumulation, or an asset manager moving into the top 10 and out of tradable) could push the ratio toward the threshold without any underlying business deterioration.

For a more concentrated issuer — say, 35% founder stake, 8% main-bank holdings, 6% insurer holdings, 8% group corporates — the same arithmetic yields a tradable-share ratio of around 38% under the new definition vs. ~57% under the old. That issuer is one shareholder-base change away from a continued-listing failure.

The policy logic: dismantling cross-shareholdings through the back door

It is important to read the 2022 redefinition as a deliberate piece of policy design, not a technical clean-up. Japan has spent two decades trying to unwind its cross-shareholding system through softer mechanisms:

• The 2010 Cabinet Office Ordinance required disclosure of the purpose and rationale of strategic shareholdings in the Annual Securities Report.
• The 2014 Stewardship Code asked institutional investors to engage on cross-shareholdings.
• The 2015 Corporate Governance Code (Principle 1.4) required listed companies to disclose policy on strategic shareholdings and to verify their economic rationale annually.
• The 2018 Code revision tightened the per-stock verification requirement.

Each of these moves shifted the conversation but did not change the math. By 2020 the FSA's policy community had concluded that disclosure-and-explain mechanisms alone would not unwind the system. The 2022 redefinition is what changed the math — by making cross-shareholdings count against you for listing maintenance, regardless of whether you disclosed them, justified them, or verified them.

flowchart TD
    A["Issuer's total shares"] --> B["Subtract: top-10 holders<br/>+ directors/officers<br/>+ treasury shares"]
    B --> C["Subtract: ALL bank holdings<br/>regardless of stake size"]
    C --> D["Subtract: ALL insurer holdings<br/>regardless of stake size"]
    D --> E["Subtract: business-corporate<br/>strategic holdings<br/>regardless of stake size"]
    E --> F["= Tradable shares"]
    F --> G{"Tradable-share ratio<br/>(% of total)"}
    G -->|"≥ 35%"| H["Prime-eligible"]
    G -->|"25%–35%"| I["Standard-eligible<br/>(not Prime)"]
    G -->|"< 25%"| J["Improvement period<br/>→ potential demotion<br/>or delisting"]

classDef pass fill:#e6efe1,stroke:#3d6b3a,color:#1f3a1d
classDef warn fill:#f9eecc,stroke:#a07e3a,color:#3a2d10
classDef fail fill:#f4d5d0,stroke:#8a3f3a,color:#3a1614
class H pass
class I warn
class J fail</pre></div>

What this means for IR


Treat the tradable-share ratio as a capital-structure metric, not a listing metric. It is determined by who owns your shares, not by your share price or trading volume. Update your tradable-share-ratio calculation every quarter — most companies will find the number drifts based on shareholder-base changes alone.


Map your shareholder base into the six tradable-share categories. Build an internal "tradable-share decomposition" that explicitly tags every top-30 holder as bank, insurer, business corporate, asset manager, retail, foreign institutional, or other. This is the operational dataset you need for any cross-shareholding-unwind discussion.


Anticipate strategic-holder disposition pressure. Banks and insurers face their own CG Code pressure to reduce cross-shareholdings (Theme 5.2). Expect your strategic-holder shareholders to come asking about disposition. Have a structured response ready — buyback price, market-impact concerns, timing, and disclosure handling.


Don't fight the math. If your structural shareholder base cannot economically support a 35% Prime tradable-share ratio after the March 2025 cliff, a voluntary transfer to Standard is a perfectly respectable answer. Companies that have done this — disclosing the transfer as a deliberate strategic choice rather than as a failure — have been received reasonably well by the market.


Document the cross-shareholding policy meticulously. The Annual Securities Report's strategic-shareholding section, the CG Report's Principle 1.4 disclosure, and the company's internal "verification of economic rationale" minutes are now interlinked with the listing-maintenance metric. Treat them as one integrated disclosure package.


Sources & further reading

JPX, "Tradable Shares — Details of Continued Listing Criteria," https://www.jpx.co.jp/english/equities/listing/continue/details/02.html
JPX, "Continued Listing Criteria (Prime Market)," https://www.jpx.co.jp/english/equities/listing/continue/outline/01.html
JPX, "Continued Listing Criteria (Standard Market)," https://www.jpx.co.jp/english/equities/listing/continue/outline/02.html
JPX, "Continued Listing Criteria (Growth Market)," https://www.jpx.co.jp/english/equities/listing/continue/outline/03.html
JPX, "Market Segments," https://www.jpx.co.jp/english/equities/market-restructure/market-segments/index.html
FSA, Corporate Governance Code (2021 revision), Principle 1.4 (Cross-Shareholdings), https://www.fsa.go.jp/en/refer/councils/follow-up/cgcode.pdf
METI, "Practical Guidelines for Group Governance Systems," https://www.meti.go.jp/english/press/2019/0628_001.html
Winston & Strawn, "Tokyo Stock Exchange Reorganization: What Listed Companies and Investors Need to Know," https://www.winston.com/en/insights-news/tokyo-stock-exchange-reorganization-what-listed-companies-and-investors-need-to-know

Cross-references

Theme 3.1 — From Four Segments to Three. The segment architecture in which the tradable-share-ratio rule operates.
Theme 3.3 — The March 2025 Cliff. When the transitional grandfather on the tradable-share rule expires.
Theme 5.2 — The End-Game of Cross-Shareholdings. Per-stock verification, the FSA pressure on banks and insurers to dispose, and what comes after the 2022 redefinition.
Theme 4.1 — PBR < 1 Is Not a Target. Cost-of-capital management as the strategic counterpart to capital-structure cleanup.
Theme 1.2 — From Main Bank to Mizuno. The keiretsu architecture this rule is dismantling.