CONTENTS
- 1. Securities Class Action | Concept and Institutional Significance

- - Scope of Securities
- - Differences from an Ordinary Civil Lawsuit
- 2. Securities Class Action | Subject Matter and Scope of the Suit

- - Scope of the Suit
- - Companies Subject to the Act
- 3. Securities class action | Requirements for filing the action

- - Duty to Retain an Attorney
- - Requirements for the Lead Plaintiff
- - Requirements for Certification of the Action
- 4. Securities class action | Procedure

- - Filing the Action and Applying for Certification
- - Public Notice of the Action and Appointment of the Lead Plaintiff
- - Review of Certification
- 5. Securities class action | Effect of the judgment and distribution of funds

- - Procedure for Distributing Damages
- 6. Securities class action | Why legal counsel can help

- - With the Support of an Attorney
1. Securities Class Action | Concept and Institutional Significance
A securities class action is a lawsuit in which, where numerous investors have suffered losses in the course of trading or otherwise dealing in securities, one or several of them act as the representative party to claim damages.
Securities-Related Class Action Act, Article 2 (Definitions)
The terms used in this Act are defined as follows.
1. The term "securities-related class action" means a claim for damages conducted by one or several persons (數人) as the representative party, where damage has occurred to many people in the course of trading or otherwise dealing in securities.
Unlike an ordinary civil lawsuit, it has the feature that a representative party may conduct the lawsuit on behalf of all of the injured parties even without each one filing individually, and in certain cases the effect of the judgment extends to the entire group.
The securities class action was introduced in light of the nature of securities markets, where investors may suffer harm on a large scale.
Because financial products are issued and traded in large volumes, a single unlawful act often causes many investors to suffer harm at the same time.
Scope of Securities
The "securities" referred to in a securities class action means securities under Article 4 of the Financial Investment Services and Capital Markets Act.
Type of Security | Description |
Debt securities | Securities representing a debt relationship, such as government bonds and corporate bonds |
Equity securities | Securities representing an ownership stake in a company, such as shares |
Beneficiary certificates | Securities representing beneficial interests, such as in an investment trust |
Investment contract securities | Securities representing rights under an investment contract |
Derivative-linked securities | Securities whose return is determined by the price of an underlying asset |
Securities depositary receipts | Securities issued so that shares of a foreign company can be traded domestically |
Where losses from trading or otherwise dealing in such securities occur on a collective basis, a lawsuit may be brought.
Differences from an Ordinary Civil Lawsuit
A securities class action differs structurally from an ordinary civil lawsuit in several respects.
Category | Ordinary Civil Lawsuit | Securities Class Action |
Method of suit | Each person files individually | A representative party represents the group |
Participation in the suit | Individual authorization required | May proceed without members' consent |
Effect of judgment | Effective only as to the parties | Effective as to all members who did not opt out |
Procedure | Ordinary civil procedure | Court approval of the suit required |
A securities class action differs greatly from an ordinary civil lawsuit in that the suit may proceed without separate authorization from members, and the effect of the judgment extends to all members who did not opt out.
2. Securities Class Action | Subject Matter and Scope of the Suit
Under Article 3, paragraph 1 of the Securities-Related Class Action Act, a suit may be brought only in the following cases.
Scope of the Suit
Relevant Provision | Type of Violation | Description |
Capital Markets Act, Article 125 | False entries in a securities registration statement or prospectus | Investor losses from false entry or omission of material matters |
Capital Markets Act, Article 162 | False disclosure in business reports and the like | False entry or omission of material matters in disclosure documents |
Capital Markets Act, Article 175 | Use of undisclosed material information | Securities trading using inside information |
Capital Markets Act, Article 177 | Market manipulation | Artificial manipulation of share prices |
Capital Markets Act, Article 179 | Unfair trading | Unfair dealing, such as the use of false information |
Capital Markets Act, Article 170 | Audit liability | Investor losses from reliance on an audit report |
Where investors suffer losses as a result of such unlawful acts, they may claim damages through a securities class action.
Companies Subject to the Act
The Act does not apply to every company. It applies only to securities transactions of companies that meet certain requirements.
Under Article 3(2) of the 「Securities-Related Class Action Act」, the following companies are covered.
Category | Description |
Company listed on a securities market | A corporation that has issued shares listed on a securities market |
Company with listed depositary receipts | Where share-related depositary receipts are listed, the corporation that issued the underlying shares |
3. Securities class action | Requirements for filing the action

The requirements for filing an action are as follows.
Duty to Retain an Attorney
Under Article 5(1) of the 「Securities-Related Class Action Act」, in a securities class action both the plaintiff and the defendant must retain an attorney as their litigation representative.
An attorney may not serve as the representative for the plaintiff in the following cases.
• The attorney has a direct financial interest in the case
• The attorney's interests conflict with those of the class as a whole
Requirements for the Lead Plaintiff
The lead plaintiff must be someone who can fairly represent the interests of the class members.
• Has a sufficient economic interest in the action
In addition, a person who has acted as a lead plaintiff or litigation representative in three or more securities class actions within the past three years cannot serve as a lead plaintiff.
The court may, however, allow it in exceptional cases.
Requirements for Certification of the Action
A securities class action may proceed only with the court's certification.
Under Article 12 of the 「Securities-Related Class Action Act」, the following requirements apply.
Requirement | Description |
Number of members | 50 or more |
Holding requirement | The securities held by the members total at least 1/10,000 of the total issued securities |
Commonality | The key factual and legal issues are common to all members |
Efficiency | A class action is a suitable means of obtaining relief |
4. Securities class action | Procedure

The procedure for a securities-related class action is as follows.
Filing the Action and Applying for Certification
A person who wishes to become the lead plaintiff must file an application for certification of the action together with the complaint.
The court notifies the exchange designated by the Financial Services Commission, and the exchange discloses this to the public.
Public Notice of the Action and Appointment of the Lead Plaintiff
Within 10 days of receiving the complaint and the application for certification, the court must give public notice of the following.
• The scope of the class members
• The purpose and grounds of the claim
• The procedure for applying to be the lead plaintiff
A member who wishes to become the lead plaintiff may file an application within 30 days of the date of the public notice.
Within 50 days after the notice, the court appoints the most suitable person as the lead plaintiff.
Review of Certification
The lead plaintiff must make a prima facie showing of the grounds for the application for certification.
The court then examines both the plaintiff and the defendant before deciding whether to grant certification.
During this process, the court may conduct any necessary inquiry, including obtaining materials from the supervisory authorities.
5. Securities class action | Effect of the judgment and distribution of funds
A final judgment binds all members who have not opted out.
(*Opting out: the procedure by which a member notifies the court that they do not wish to be bound by the judgment in the class action)
In other words, an investor who has not opted out will have their rights or obligations determined by the outcome of the judgment, even without filing a separate suit.
Procedure for Distributing Damages
Once a damages judgment becomes final, the funds are distributed through the following steps.
Step | Description |
Obtaining an enforcement title | The lead plaintiff secures the right through the judgment |
Appointing a distribution administrator | The court designates a distribution administrator |
Distributing the funds | The damages are distributed to the investors |
The distribution administrator carries out the distribution under the court's supervision.
6. Securities class action | Why legal counsel can help
A securities class action can proceed only after several legal requirements are met, including the court's certification procedure, the lead plaintiff system, the definition of the class members, and the procedure for distributing damages.
Because the structure consolidates the losses of many investors into a single case, legal review and the organization of evidence are regarded as important parts of the process.
It therefore matters to review the facts and legal issues accurately before deciding how to respond.
With the Support of an Attorney
Daeryun Law Firm analyzes the structure and legal issues of a case and provides legal advice to help address procedural problems that may arise as the litigation moves forward.
We also review how the investment losses arose and how the transactions were structured, analyzing whether losses occurred, where responsibility lies, and the scope of compensation, and we develop a response strategy tailored to the particular case.
• Advice on the legal effects and scope of liability arising from appointment as lead plaintiff
• Collection of evidence and analysis of the facts to prove investment losses
• Digital forensics support, including review of financial transaction records and electronic data
• Review of methods for calculating damages and design of the distribution procedure
• Development of a response strategy for the court's certification procedure and the trial on the merits
• Analysis of legal risks in related cases and cases that may be consolidated
• Follow-up legal advice on enforcement and the exercise of rights after judgment
If you are facing a situation that calls for a legal response, 🔗Damages · Civil Litigation Attorney Legal Consultation Booking is available to review the facts of your case and the direction of your response.










