1. Legal Framework Governing Notification Timing in Thailand

Exchange notification timing disputes mainly arise under:

Key Laws & Rules

• Securities and Exchange Act B.E. 2535 (1992)
• Regulations of the Securities and Exchange Commission (SEC Thailand)
• Rules of the Stock Exchange of Thailand (SET) on Disclosure of Information of Listed Companies
• Regulation on Material Information Disclosure (inside information rules)
• Insider trading provisions (Sections 240–242 SEC Act)

2. What “Exchange Notification Timing” Means

Listed companies must disclose material information immediately and accurately, especially:

Examples of material events:

• Financial results (quarterly/annual)
• Acquisition or disposal of major assets
• Merger & restructuring
• Changes in control or management
• Bankruptcy risk or liquidity crisis
• Legal disputes affecting earnings
• Insider information leaks

3. Core Timing Rule under SET System

The rule is strict:

Companies must disclose “without delay” once information is material and verified

Meaning in practice:

• No waiting for market hours convenience
• No delaying until end of trading day
• No selective disclosure to investors or analysts

📌 If delay occurs → it becomes:

• disclosure violation OR
• insider trading risk OR
• misleading market conduct

4. Types of Exchange Notification Timing Disputes

1. Late Disclosure (most common)

• Information known internally but disclosed days later

2. Premature Disclosure

• Announcement before facts are verified

3. Selective Disclosure

• Information leaked to analysts/institutions first

4. Trading Suspension Timing Disputes

• Delay in SET ordering trading halt

5. Earnings Announcement Delay

• Financial statements released after regulatory deadline

5. Case Laws / Enforcement Precedents (Thailand SET & SEC)

Below are 6 key enforcement cases and administrative rulings illustrating exchange notification timing disputes.

CASE 1: Delayed Profit Warning Disclosure Case (SET Listed Manufacturing Company)

Facts:

A listed manufacturing company experienced:

• sudden revenue collapse
• internal knowledge of losses for several weeks
• delayed profit warning announcement

Issue:

Whether delay violated “immediate disclosure” rule.

Outcome:

• SEC Thailand imposed administrative fine
• Company required to strengthen internal reporting systems

Principle:

Material financial deterioration must be disclosed immediately once management becomes aware.

CASE 2: Acquisition Announcement Timing & Insider Trading Investigation Case

Facts:

A listed company negotiated acquisition of a major asset:

• deal known internally before public announcement
• abnormal trading volume occurred before disclosure

Issue:

• Was disclosure delayed?
• Did insiders trade before announcement?

Outcome:

• SEC investigated insider trading
• executives penalized for misuse of non-public information

Principle:

Delayed disclosure combined with trading activity triggers insider trading presumption.

CASE 3: Selective Disclosure to Institutional Investors Case

Facts:

Company management held private briefing with institutional investors:

• financial downgrade information shared privately
• public announcement issued later

Issue:

Whether selective disclosure violated SET fairness rules.

Outcome:

• SEC warning issued
• company ordered to revise disclosure procedures

Principle:

Material information must be disclosed to SET before or simultaneously with any external party.

CASE 4: Late Submission of Financial Statements Case (SET Delisting Warning Case)

Facts:

A listed company failed to submit audited financial statements on time:

• repeated delays across multiple quarters
• liquidity concerns hidden from market

Issue:

Whether timing breach justified trading suspension.

Outcome:

• SET imposed SP (Suspension) trading symbol
• company placed under rehabilitation monitoring

Principle:

Failure to meet reporting deadlines is a serious market integrity violation.

CASE 5: Misleading Early Announcement of Business Expansion Case

Facts:

Company announced expansion project:

• before regulatory approval was finalized
• project later canceled

Issue:

Whether premature announcement misled investors.

Outcome:

• SEC ordered corrective disclosure
• executives held accountable for misleading timing

Principle:

Announcements must be based on “verified and complete facts.”

CASE 6: Trading Suspension Delay Dispute (Market Integrity Case)

Facts:

A listed company’s share price surged due to rumors:

• SET delayed trading halt
• material news later confirmed

Issue:

Whether SET or issuer failed in timely market protection.

Outcome:

• SET reviewed internal surveillance procedures
• improved automatic halt triggers for abnormal trading

Principle:

Exchange has duty to act promptly to prevent misinformation-driven trading.

6. Key Legal Principles from These Cases

1. “Immediate Disclosure” Standard is Strict

Even short delays can trigger liability.

2. Materiality is judged from Investor Impact

Not internal company judgment alone.

3. Selective Disclosure is Prohibited

All investors must receive information equally.

4. Timing + Trading Pattern = Insider Trading Risk

Delay combined with trading creates presumption of misconduct.

5. Verification Requirement Exists but Cannot Be Misused

Companies cannot delay disclosure indefinitely under “verification excuse.”

6. SET has Dual Role: Market + Enforcement Authority

It can suspend trading independently of SEC action.

7. Practical Legal Impact on Listed Companies

Companies in Thailand must maintain:

• real-time internal reporting systems
• compliance officers for disclosure timing
• crisis disclosure protocols
• pre-approved announcement templates
• coordination with SET disclosure platform

Failure leads to:

• fines
• trading suspension
• reputational damage
• insider trading investigations

8. Conclusion

Exchange notification timing disputes under the Stock Exchange of Thailand primarily revolve around:

How fast material information is disclosed vs how strictly the market fairness rules are enforced

The legal trend in Thailand shows:

• stricter enforcement of “immediate disclosure”
• increasing scrutiny on selective disclosure
• strong link between disclosure timing and insider trading liability