Corporate Law in Japan

📅 July 7, 2026 📖 806 words 📂 corporate-law japan

Overview of Japanese Corporate Law

Japanese corporate law is governed principally by the Companies Act (Kaisha Ho, Law No. 86 of 2005, effective 1 May 2006), which consolidated and modernised the corporate provisions previously scattered across the Commercial Code. Substantially amended in 2014 (effective 2015) and 2019, the Act creates a hybrid civil-law system with significant US and German influences, balancing shareholder primacy with stakeholder-oriented governance norms.

Types of Companies

The Companies Act provides for four types of kaisha:

Stock Company (Kabushiki Kaisha or KK) — The dominant form for medium and large enterprises, characterised by share issuance, a board of directors, and statutory auditors or committee structures. Public KKs face additional disclosure requirements under the Financial Instruments and Exchange Act (FIEA).

Limited Liability Company (Godo Kaisha or GK) — Modelled on the US LLC and German GmbH. Members may manage directly or appoint managers; all members have limited liability. Increasingly used for joint ventures and foreign subsidiaries.

Limited Partnership (Goshi Kaisha) and Unlimited Partnership (Gomei Kaisha) — Rare in modern practice.

Corporate Governance Structures

KKs may choose among three governance models:

Company with Statutory Auditors (Kansayaku) — The traditional model. A board of statutory auditors (kansayaku kai), elected by shareholders, audits directors’ execution of duties independently of the board.

Company with Audit Committee (Kansa Iin Kai) — Introduced in 2014. An audit committee within the board, composed of a majority of outside directors, replaces the statutory auditor system, approximating the Anglo-American unitary board structure.

Company with Nominating, Audit, and Compensation Committees (Iin Kai To Secchi Gaisha) — Introduced in 2002. The board delegates key decisions to three committees, each with a majority of outside directors. This model is preferred by companies with significant foreign institutional ownership.

Directors’ Duties and the Business Judgment Rule

Directors owe a duty of care (Article 330, Companies Act, read with Article 644, Civil Code) and a duty of loyalty (Article 355). Japanese courts treat the duty of loyalty as a specific expression of the duty of care rather than a separate fiduciary duty. The Business Judgment Rule (keiei handan no gensoku), recognised since the Supreme Court’s 1970 Asahi Kasei Soko decision, holds that a director’s decision will not be second-guessed if made on adequate information and with reasonable care, in good faith, and without conflicts of interest. The 2014 amendments imposed monitoring obligations requiring large KKs to establish internal control systems (naibu tosei shisutemu).

The Corporate Governance Code

Japan’s Corporate Governance Code (Tokyo Stock Exchange, 2015, revised 2018 and 2021) applies on a “comply or explain” basis to all listed companies. Key requirements include: at least two independent outside directors (for Prime Market companies, one-third of the board must be independent); a nomination and compensation committee composed of a majority of independent outside directors; board effectiveness evaluations; and disclosure of policy shareholding (seisakuteki mochiai) and human capital policies.

Shareholder Rights

Shareholders enjoy voting rights (one vote per share, Article 308), derivative actions (Article 847 — a six-month holder may sue directors for duty violations; the 1993 reduction of filing fees to ¥8,200 triggered a surge in derivative litigation, since stabilised), shareholder proposals (holders of 1% or more of voting rights or 300 or more votes may submit proposals, Article 303), appraisal rights for dissenters from fundamental changes (Articles 785, 797, 806), and books and records inspection (3% or more of voting rights, Article 433).

The Keiretsu System

Post-war Japan’s keiretsu — horizontal groups centred on a main bank with cross-shareholdings (mochiai) — have weakened considerably since the 1990s due to pressure from foreign investors, the banking crisis, and the Corporate Governance Code’s requirement that listed companies disclose and justify policy shareholdings. However, governance-oriented cross-shareholdings persist in modified form among some industrial groups.

Corporate Finance

A KK may issue common and preferred shares, stock acquisition rights (shinkabu yoyakuken, including stock options), and restricted stock (kinshi kabushiki, introduced 2014). Bonds (shasai), including convertible bonds and bonds with stock acquisition rights, are regulated by the Companies Act and the FIEA.

Mergers and Acquisitions

The Companies Act provides for share exchanges (kabushiki kōkan), share transfers (kabushiki iten), and mergers (gappei). Triangular mergers (sankaku gappei), introduced in 2007, facilitate inbound cross-border acquisitions. The FIEA imposes a mandatory tender offer requirement for acquisitions exceeding one-third of voting rights in a listed company.

Relevant Statutes

Companies Act (Kaisha Ho), Law No. 86 of 2005
Financial Instruments and Exchange Act, Law No. 25 of 1948
Corporate Governance Code (TSE, 2015, revised 2018, 2021)
Japan’s Stewardship Code (2014, revised 2017, 2020)