Antitrust Litigation_2026

JAPAN

Russia

China

N. Korea

Japan

S. Korea

Law and Practice Contributed by: Koki Yanagisawa Nagashima Ohno & Tsunematsu

Tokyo

Contents 1. Introduction P.83 1.1 Current Framework for Private Antitrust Litigation p.83 1.2 Recent Developments p.83 2. Private Antitrust Claims: Basis and Procedure P.83 2.1 Statutory Basis p.83 2.2 Courts p.84 2.3 Impact of Competition Authorities p.85 2.4 Proof p.85 2.5 Pass-On Defence p.86 3. Limitation Periods and the Duration of Litigation P.86 3.1 Statute of Limitations p.86 3.2 Typical Length of Private Antitrust Litigation p.86 4. Class and Collective Actions P.86

7. Witness and Expert Opinions P.89 7.1 Witness Procedure p.89 7.2 Expert Witness Role and Procedure p.90 8. Damages P.90 8.1 Damages: Assessment, Passing On and Interest p.90 9. Liability and Contribution P.91 9.1 Joint and Several Liability p.91 9.2 Contribution p.91 10. Other Remedies P.91 10.1 Injunctions p.91 10.2 Alternative Dispute Resolution p.92 11. Funding and Costs P.92 11.1 Litigation Funding p.92 11.2 Costs p.92 12. Appeals P.93 12.1 Basis of Appeal p.93 13. Looking Forward P.93 13.1 Legislative Trends and Other Developments p.93

4.1 Statutory Basis p.86 4.2 Opting In or Out p.87 4.3 Direct/Indirect Purchasers p.87 4.4 Class Certification p.87 5. Choice of Jurisdiction P.87 5.1 Rules on Jurisdiction and Applicable Law p.87 6. Disclosure/Discovery P.88 6.1 Disclosure/Discovery Procedure p.88 6.2 Legal Professional Privilege p.89 6.3 Leniency and Settlement Agreements p.89

81 A NTITRUST LI T IGATI O N 2026

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