Foreign founders structuring a Kabushiki Kaisha, or "KK" (株式会社) for venture capital fundraising, joint venture formation, or PE acquisition face a legal framework that is more flexible than commonly assumed, but significantly different from Delaware or English company law in its mechanics. The Companies Act (会社法) gives a KK broad authority to create multiple classes of shares with differentiated economic and voting rights, but the implementation pathway runs entirely through the Articles of Incorporation (定款), not through separate shareholder-level instruments as in some other jurisdictions. This guide explains what the law permits, how each instrument is drafted in practice, and where the structural limits are for investors seeking protections that are standard elsewhere.
Last Updated: May 2026 · Reading Time: ~12 min
The Companies Act Share Class Framework
The 会社法 establishes two foundational categories of shares for a KK.
ordinary shares (普通株式) carry equal economic and voting rights across all holders. This is the default for any KK that has not opted into a multi-class structure. Every right, obligation, and vote is proportionate to the number of shares held.
class shares (種類株式) are shares with differentiated terms expressly specified in the 定款. A KK wishing to issue class shares must first amend its 定款 to describe the rights of each class, and the amended 定款 must be registered at the Legal Affairs Bureau (法務局, homu kyoku). This is not an optional formality: until the 定款 amendment is registered, the new class does not exist as a legal matter.
Under Art. 108 (会社法第108条), a KK may issue shares differentiated across nine enumerated dimensions:
(a) Dividend distributions (剰余金の配当) (b) Residual assets on liquidation (残余財産の分配) (c) Voting rights at the general shareholders meeting (議決権) (d) Transfer restrictions (譲渡制限) (e) Acquisition request rights (取得請求権: holder can demand company repurchases) (f) Acquisition by the company on specified events (取得条項) (g) Whole-class acquisition by special resolution (全部取得条項付種類株式) (h) Veto rights over certain resolutions (拒否権, discussed separately below) (i) Director/auditor election rights (議決権の行使を役員等の選任に限定した種類株式)
A single share class may carry more than one of these attributes. A class may also be designed to have none of the default ordinary attributes, so it is possible to create a pure economic share with no vote, a pure governance share with no economic rights, or a hybrid instrument.
Practical note: Japan does not have an equivalent to the US "blank check preferred" concept. The terms of each class must be described in detail in the 定款 at the time the class is authorized. This means the KK cannot issue a new series of preferred stock with bespoke terms each round without a fresh 定款 amendment for that series.
Preferred Shares: Liquidation Preference, Dividend Preference, and Conversion
Liquidation Preference
A liquidation preference share (残余財産分配優先株式) is issued by specifying in the 定款 that holders of Class A shares receive a defined amount per share (or a defined multiple of the original issue price) from residual assets before any distribution to ordinary shareholders.
The mechanics require the 定款 to state: (a) the priority amount or formula; (b) whether the preference is participating or non-participating; and (c) whether the preference is cumulative with respect to unpaid dividends. None of these terms have a statutory default: if the 定款 is silent, the courts will apply ordinary pro-rata distribution rules.
Participating vs. non-participating: If Class A shares are participating, after receiving their liquidation preference amount the holders also share in any remaining residual assets alongside ordinary shareholders on an as-converted basis. If non-participating, they receive only their preference amount. Japan practice varies by deal; VC-backed rounds typically use non-participating preferences with a conversion feature.
Cumulative dividends: If the 定款 specifies cumulative dividends on preferred shares, any unpaid dividend from prior years accrues and must be paid on liquidation before ordinary shareholders participate. Non-cumulative preferences are also common. The 定款 must be explicit on which regime applies.
Dividend Preference
A dividend preference share (配当優先株式) is similarly specified in the 定款 under 会社法第108条第1項第1号. The company pays preferred dividends before any dividend to ordinary shareholders. Dividends in a KK require a resolution of the general shareholders meeting (株主総会) unless the 定款 delegates this authority to the board under 会社法第459条, which is a common practice for companies with audit and supervisory committee (監査等委員会設置会社) or three-committee governance structures.
Conversion Rights
A conversion right allows a preferred shareholder to convert into ordinary shares at a defined ratio. Under 会社法第108条第1項第5号, this is implemented as a acquisition request right (取得請求権): the holder requests that the company acquire the preferred shares, and the company delivers ordinary shares as consideration. The 定款 must specify:
(a) The class and number of shares delivered on conversion (b) The request period or trigger conditions (c) An adjustment formula for the conversion ratio on capital events (the anti-dilution mechanism discussed below)
A separate but related structure is the company-side acquisition right (取得条項付種類株式), under 会社法第108条第1項第6号, which allows the company to force conversion upon a specified event (for example, on completion of a qualified IPO). This is the Japan equivalent of automatic conversion on IPO, which is standard in US venture capital deals and is fully available in a KK structure.
Drafting Preferred Terms into the 定款
The 定款 must contain a class share content (種類株式の内容) section that specifies the complete economic and governance terms for each class. A well-drafted preferred class share provision will address: (a) dividend priority amount or formula; (b) liquidation priority amount or formula; (c) participation mechanics; (d) conversion ratio and adjustment formula; (e) whether the preferred votes with ordinary shares on an as-converted basis or on a separate class vote; and (f) any mandatory conversion trigger.
Common drafting failure: Foreign investors frequently draft preferred terms in an investment agreement (投資契約) or subscription agreement (株式引受契約) and assume the 定款 can be a short document. In Japan, if the 定款 does not contain the full class share content, the terms in the side agreement are not enforceable against the company or third-party transferees. The 定款 is the constitutional document, and class share rights must live there.
Veto Shares and Golden Shares
The 拒否権付種類株式 Structure
会社法第108条第1項第8号 permits a KK to issue veto-right class shares (拒否権付種類株式), commonly called golden shares (黄金株). The holder of a golden share must separately approve any resolution that falls within the scope defined in the 定款, even after an ordinary shareholders meeting has already passed that resolution.
The scope of the veto right is defined entirely in the 定款. It can cover: board appointment and removal, major asset disposals, capital increases, 定款 amendments, mergers and demergers, or any other category the drafters choose to specify. There is no statutory limit on scope.
The practical control mechanism: A founder holding even one golden share can block any resolution within the defined veto scope regardless of how diluted their economic interest becomes through subsequent financing rounds. This makes golden shares the strongest founder control instrument available in a Japanese KK.
Important limitation under 会社法第322条: Certain 定款 amendments that adversely affect a class of shares require the approval of the affected class, through a class shareholders meeting (種類株主総会). This provision operates independently of the veto share mechanism: it protects ordinary shareholders from having their rights amended without their own class's consent, even if the golden share holder approves the overall resolution.
Limitation for listed companies: The Tokyo Stock Exchange requires companies seeking a listing to confirm that governance arrangements do not entrench management in a manner inconsistent with shareholder value. While there is no blanket prohibition on golden shares in listed KKs, in practice the TSE will scrutinize veto share arrangements at the listing review stage, and most golden share structures are dismantled or converted before a public offering.
Shares Carrying Director Election Rights
Under 会社法第108条第1項第9号, a class of shares can carry the exclusive right to elect specific directors. This is a board composition protection instrument: a PE fund or strategic investor holding Class B shares may have the exclusive right to elect two of five directors regardless of voting percentages. The mechanics are similar to golden shares but targeted at board composition rather than resolutions.
Transfer-Restricted Shares
What 譲渡制限株式 Means
会社法第107条第1項第1号 permits a KK to restrict the transfer of all or a specified class of its shares by providing in the 定款 that any transfer requires the company's approval (会社の承認). This is a transfer-restricted share (譲渡制限株式).
The approval right belongs to the company (acting through its board or shareholders depending on the 定款), not to individual shareholders. When a shareholder requests transfer approval and it is refused, the company must either purchase the shares itself or designate a third-party purchaser. If the company takes neither step within the statutory period, approval is deemed granted.
Why Most KKs Use Transfer Restrictions by Default
Transfer-restricted shares are not unusual in Japan: the majority of KKs in Japan have all shares subject to transfer restriction. This is because a KK without transfer restrictions must appoint a statutory auditor (監査役) and comply with heightened governance requirements once certain thresholds are met. For a closely held company, restricting all shares keeps the governance structure simpler.
For foreign investors acquiring shares in a Japanese target or investing in a joint venture KK, the existence of transfer restrictions means any intended exit through secondary sale requires board (or shareholder meeting) approval. This must be addressed explicitly in the shareholders agreement before investment, through a pre-approved transfer mechanism or a mandatory buyout obligation. The 定款 transfer restriction does not automatically allow the investor to sell freely to any third party.
Partial Transfer Restrictions for Class Shares
A KK can apply transfer restrictions to one class of shares but not another. For example, ordinary shares held by the founder may be transfer-restricted while preferred shares held by institutional investors are freely transferable. This structure allows an investor to exit freely while keeping the founder locked in. Both structures are achievable through the 定款.
Employee Stock Options vs. Restricted Shares
Stock Acquisition Rights / Warrants (新株予約権)
Japan does not have a statutory concept of "employee stock options" in the sense used in US or UK practice. The vehicle is the stock acquisition right (新株予約権), issued under 会社法第238条. A 新株予約権 gives the holder the right to acquire new shares in the KK by paying an exercise price within a specified exercise period. When issued to employees as remuneration, the 新株予約権 functions as a stock option.
Tax-qualified stock options (税制適格ストックオプション): Under the Act on Special Measures Concerning Taxation (租税特別措置法), a 新株予約権 issued under specific conditions may qualify for favorable tax treatment: gain is taxed only at the time shares are subsequently sold (capital gains), not at the time of exercise. Conditions include: (a) exercise price at least equal to fair market value at grant; (b) annual exercise amount not exceeding a statutory cap (currently JPY 24 million per year for most cases, raised from JPY 12 million for certain qualifying startup employees under 2023 and 2024 tax reforms); (c) exercise period between two and ten years from grant date; (d) shares are deposited with a certified securities firm or designated financial institution on exercise. Exact qualification requirements should be confirmed with a Licensed Tax Accountant (税理士) for each grant.
Non-qualified 新株予約権: Options that do not meet the tax-qualified conditions are taxed as employment income at exercise, based on the difference between the exercise price and the share fair market value at exercise. For unlisted companies, this creates a cash tax liability without a liquidity event, which is a common friction point in Japan startup compensation design.
Restricted Share Units / Restricted Shares (譲渡制限付株式)
会社法第197条から第200条 provides a framework for issuing shares with transfer restrictions as a compensation instrument (generally referred to as 譲渡制限付株式報酬). The company issues shares to an employee at a nominal or below-market price, subject to transfer restriction and forfeiture conditions that lapse over a vesting schedule. On vesting, the restrictions are lifted.
Key differences from stock options:
(a) Restricted shares involve immediate share issuance; the employee becomes a shareholder from day one with voting and dividend rights (subject to contractual restrictions) (b) Stock options (新株予約権) give only the right to acquire shares in the future; the holder is not a shareholder until exercise (c) Tax timing differs: for restricted shares, employment income is recognized when the forfeiture restrictions lapse (unless the structure qualifies for deferral treatment); for tax-qualified options, income recognition is deferred to share sale
For early-stage KKs, stock options are generally preferred because restricted shares require an immediate capital contribution from the employee (even if nominal), and the per-share valuation at grant is a more visible data point that can complicate the overall equity story in early rounds.
Anti-Dilution Protections in Japan
Full Ratchet vs. Broad-Based Weighted Average
Japanese law does not contain a concept equivalent to the Cayman Islands or Delaware "anti-dilution provision" as a statutory construct. Anti-dilution protection in a Japan KK is implemented through the conversion ratio adjustment formula specified in the 定款 for the preferred share class.
The 定款 must set out a formula that adjusts the number of ordinary shares deliverable on conversion when the company issues new shares below the original preferred issue price. Two formulas are used in practice:
(a) Full ratchet: The conversion ratio adjusts to ensure the investor receives enough shares to be treated as if they had originally invested at the new lower price. This gives maximum dilution protection but is extremely punitive for founders and later investors. It is uncommon in Japanese venture deals.
(b) Broad-based weighted average: The adjustment takes into account the number of existing fully diluted shares and the new issue size, producing a partial adjustment proportionate to the dilutive impact. This is the standard formula in Japan VC practice.
Structural Limits under Japanese Law
Several features of US or European anti-dilution provisions operate differently or have no direct equivalent under 会社法:
(a) Pay-to-play: A pay-to-play provision that converts non-participating investors' preferred to ordinary shares can be implemented, but it requires the company to have the right to compulsorily acquire and reclassify shares. Under 会社法第108条第1項第7号 (全部取得条項付種類株式), the company can acquire an entire class of shares by special resolution and issue a new class in its place. This is the mechanism used for pay-to-play in Japan, but it requires a shareholders meeting resolution each time it is triggered.
(b) Preemptive rights (新株発行の先買権): The 会社法 gives existing shareholders the right to subscribe for new shares in proportion to existing holdings only when that right is expressly granted in the 定款 or in the terms of a specific issuance resolution. There is no automatic statutory preemption right for ordinary shareholders in a KK (unlike UK law). Preemptive rights for preferred shareholders must be built into the 定款 or into a shareholders agreement with appropriate 定款 cross-references.
(c) Down-round issuance approval: Under 会社法第199条, issuance of new shares at a particularly favorable price (有利発行) to specific persons requires approval by special resolution (特別決議) of the general shareholders meeting. A down round where new investors receive shares at a price lower than prior investors' price typically triggers the 有利発行 requirement. This provides existing investors a structural veto on seriously dilutive down rounds, through the general meeting process, regardless of whether they hold class shares.
Tag-Along and Drag-Along Rights
How They Are Implemented
Tag-along rights (共同売却請求権) and drag-along rights (強制売却請求権) are not addressed in the 会社法 as statutory share rights. They are contractual arrangements. This creates a choice between two implementation approaches.
Approach 1: Shareholders agreement only (株主間契約). The rights are recorded in a shareholders agreement (株主間契約) and bind only the parties who sign. This approach is simple to implement, does not require a 定款 amendment, and does not require registration. The limitation is that it binds only signatories: a new shareholder who buys shares from a founder does not automatically inherit the obligation unless the shareholders agreement contains an assignment clause and the purchaser signs a deed of adherence.
Approach 2: Embedded in the 定款 through transfer-restriction mechanics. The transfer-approval requirement under 会社法第107条 or 会社法第108条第1項第4号 can be structured so that: (a) a board or shareholder resolution approving a founder's sale requires tag-along compliance as a condition; or (b) a forced sale mechanism is built into the 定款 as an acquisition right triggered by a defined liquidity event. This approach has statutory weight and binds all shareholders including future transferees, but requires careful drafting and a 定款 amendment each time terms change.
Japanese market practice: Most Japan VC and PE deals use a shareholders agreement for tag-along and drag-along, combined with transfer-restriction provisions in the 定款 that require board approval for any sale. The board approval process then serves as the enforcement point: a seller cannot transfer without board approval, and board approval can be made conditional on compliance with tag-along obligations in the shareholders agreement. This approach keeps the 定款 clean while creating an effective practical enforcement mechanism.
Limits on Drag-Along in a KK Structure
A drag-along mechanism that forces a dissenting minority shareholder to sell requires care under Japanese law on two fronts.
First, under 会社法第322条, any 定款 amendment or structural change that adversely affects a class of shares requires approval of that class through a 種類株主総会. A drag-along embedded in the 定款 cannot be amended or removed without the class's own consent.
Second, a drag-along at a valuation below the dissenting shareholder's acquisition cost can raise claims under general civil law principles of good faith (信義誠実の原則). While Japan courts have not struck down commercially negotiated drag-along provisions as per se void, drafting that triggers a forced sale at a below-cost price without a floor valuation or independent fairness mechanism carries litigation risk.
Practical recommendation: set a floor valuation for any drag trigger, require an independent valuation for any drag at a price that does not represent a return to all shareholders, and ensure drag-along provisions in the shareholders agreement are countersigned by all shareholders whose shares can be dragged.
The Squeeze-Out Mechanism and Minority Protections
Foreign PE funds acquiring a controlling stake in a Japan KK should note that the 会社法 provides squeeze-out mechanisms for majority shareholders, but also provides matching protections for minorities.
Under 会社法第179条, a shareholder holding 90% or more of the total voting rights can acquire all remaining shares compulsorily (特別支配株主の株式等売渡請求 / Special Controlling Shareholder Share Cash-Out). The cash-out price is set by the majority, but dissenting minorities can apply to the court for a price determination (価格決定申立), which may result in a higher payout.
For acquisitions below the 90% threshold, squeezing out minorities requires using the 全部取得条項付種類株式 mechanism under 会社法第171条: the company amends its 定款 to add a compulsory acquisition provision, the general shareholders meeting approves the acquisition by special resolution under two-thirds majority (会社法第309条第2項), and then separately resolves to acquire all shares of that class. Minorities are entitled to appraisal rights (価格決定申立) and can seek fair value determination from the court.
What this means for minority investors: the structural protections available to a minority investor who has not negotiated express contractual protections are limited. The court-supervised appraisal right exists, but it is procedurally demanding. Investors should not rely on appraisal rights as their exit mechanism; negotiated put options (買取請求権) or guaranteed buyback arrangements in the shareholders agreement are far more reliable.
Amending the 定款 to Add New Share Classes: Procedure
Required Resolutions
Adding a new class of shares to an existing KK requires:
(a) special resolution (特別決議) of the general shareholders meeting (株主総会): under 会社法第466条, a 定款 amendment requires a special resolution, which means approval by shareholders holding two-thirds or more of the voting rights present at a quorum-valid meeting, with a minimum of one-third of total voting rights present. The 定款 may raise these thresholds but not lower them below the statutory minimum.
(b) class shareholders meeting (種類株主総会) approval where required: under 会社法第322条, if the 定款 amendment adversely affects an existing class of shares, that class must separately approve the amendment. "Adversely affects" includes: introducing a senior preferred class above an existing preferred class, reducing dividend priority, and creating a new class with acquisition rights over the existing class's shares.
(c) Registration: the amended 定款 and the new capital structure must be registered at the Legal Affairs Bureau (法務局) within two weeks of the resolution (会社法第915条). The registered 定款 is a public document. The class share terms, including preferred dividends, liquidation preferences, conversion ratios, and veto rights, are all publicly registered and visible to third parties.
New Share Issuance to Investors
Issuing shares of the new class to investors requires a further resolution under 会社法第199条 authorizing the specific issuance terms (number of shares, issue price, payment date). If the issue price is at a favorable price to specific investors (有利発行), that resolution must also be a special resolution, and the board must explain to shareholders the reasons the favorable issue is in the company's interests.
Timeline and Practical Steps
A clean 定款 amendment and share issuance to a VC investor in a Japan KK typically follows this sequence:
(a) Negotiate and agree on term sheet (termsheet / 投資条件合意書) (b) Draft new 定款 with class share provisions, reviewed by judicial scrivener (司法書士) and legal counsel (c) Circulate draft 定款 and shareholders agreement for investor review (d) Hold 株主総会 to pass special resolution on 定款 amendment and share issuance (e) Receive subscription payment from investor (f) File amended 定款 and new share register at the Legal Affairs Bureau (法務局) (g) Execute and countersign shareholders agreement
Steps (d) through (f) can be completed in three to five business days for a simple single-class preferred issuance. Complex multi-class structures with multiple classes requiring separate 種類株主総会 approvals can take two to three weeks once documentation is agreed.
Document burden note: Japan corporate law requires physical originals or certified electronic equivalents for most 株主総会 resolutions. Remote participation is permitted under reforms implemented since 2022 (allowing fully virtual general meetings for companies that amend their 定款 to permit it), but the resolution documents must still comply with the 会社法 formalities. Factor in the judicial scrivener's review time and the legal affairs bureau's registration processing time (normally one to two business days for standard amendments in major cities).
Conclusion
The 会社法 provides a KK with a comprehensive share class toolkit. Preferred economics, liquidation preferences, dividend priorities, conversion rights, veto shares, director election rights, and transfer restrictions are all available within the statutory framework. The critical difference from many other jurisdictions is that almost all of these protections must be specified in the 定款 and registered, rather than existing only in a private shareholders agreement. Investors and founders who focus their negotiation on the investment agreement without an equally rigorous review of the 定款 are building protections on an incomplete foundation.
This article is informational only and does not constitute legal, tax, or regulatory advice. Consult a qualified advisor before acting on the content. Last updated: May 2026.