Thailand’s stock market has been grappling with a deepening crisis of confidence in recent months as revelations of corporate fraud and persistent market underperformance have unsettled both domestic and international investors.

Multiple high-profile cases involving major listed firms, including allegations of accounting irregularities and transparency lapses at companies such as Stark Corporation, JKN and others, have highlighted serious governance concerns that have eroded faith in the integrity of corporate disclosures and market supervision.

The cumulative effect of these irregularities has been a loss of investor trust, particularly among retail participants, and has contributed to the Stock Exchange of Thailand (SET) underperforming its regional peers in terms of trading activity and valuations.

Compounding these issues, Thailand’s benchmark SET index has tumbled more than sixteen per cent in 2025, placing it among the weakest major indices globally and intensifying capital flight.

Persistent equity outflows by foreign investors have reflected growing concerns about Thailand’s economic outlook, corporate governance standards and political uncertainties, even as authorities and market participants seek to stem the decline through policy measures.

In response to the erosion of confidence, regulators and market institutions have announced a series of reforms intended to shore up trust and strengthen oversight.

The Stock Exchange of Thailand has unveiled a four-point strategy focused on regulatory reform, enhanced investor protections and modernised market rules aimed at improving transparency and fairness across trading practices.

These measures include tightening trading regulations, revising listing standards and expanding capabilities to monitor and investigate irregular market behaviour.

The Thai government has also moved to empower the Securities and Exchange Commission (SEC) with additional authority to act promptly against suspected fraud and financial misconduct, reflecting a broader push to address oversight gaps exposed by recent scandals.

Authorities argue that swifter enforcement and stronger penalties are necessary to deter wrongdoing and restore market credibility.

Despite these efforts, experts say that restoring investor confidence will require sustained improvements in enforcement efficiency, corporate governance practices and overall economic stability.

Without these deeper reforms, analysts warn, the Thai stock market may continue to struggle with volatility and investor scepticism, even as policymakers work to rebuild trust in one of Southeast Asia’s key financial centres.