False Disclosure Scandal Shakes Thai Capital Market Integrity

Reliable information is the foundation of every capital market. Whether investors are buying a few hundred shares or evaluating a multi-billion-baht acquisition, they make decisions assuming the information disclosed through official channels is accurate. That assumption was shaken in Thailand when Supaporn Phimpong submitted a series of false Form 246-2 filings claiming significant share acquisitions in six listed companies. Although Thailand's Securities and Exchange Commission (SEC) later confirmed that no such holdings existed, the disclosures had already entered the public domain through the regulator's online filing system, triggering widespread concerns over the integrity of Thailand's disclosure framework. Rather than an isolated case, the incident is widely viewed as the most significant test yet of Thailand's self-reporting disclosure system, raising questions about how regulators can balance rapid disclosure with data accuracy while preserving investor confidence. WHAT IS FORM 246-2 AND WHY DOES IT MATTER? Form 246-2 is Thailand's Report on Acquisition or Disposition of Securities. Under the Securities and Exchange Act, investors must file the form whenever their shareholding crosses every 5% threshold of a listed company's voting rights, for example from 4.9% to 5.1%, or from 10% to less than 5%. The disclosure serves an important market function, allowing investors to identify when major shareholders are accumulating or reducing stakes, whether control of a listed company is changing hands, and whether a takeover could be emerging. Because institutional investors closely monitor these filings, Form 246-2 is often viewed as an early indicator of strategic investment activity. False information has the potential to mislead investors and distort market sentiment. HOW IS SELF-REPORTING A WEAK LINK? Thailand's disclosure utilises the self-reporting principle. Shareholders submit the information themselves through the SEC's online filing system, certify its accuracy, and the information is published automatically so the market receives timely disclosure. Only afterwards does the SEC verify the information if irregularities emerge. The Supaporn case exposed the main vulnerability of this approach -- if someone intentionally files false information, the system does not automatically detect the discrepancy before publication. According to the SEC, this framework is not unique to Thailand. Pornanong Budsaratragoon, secretary-general of the regulator, said the self-reporting model is widely used in developed markets, including the US, because regulators prioritise timely disclosure while relying on post-disclosure verification and legal enforcement. HOW DID THE SUPAPORN CASE UNFOLD? The controversy began on June 30 and July 2, when the SEC's online filing system published seven Form 246-2 reports covering six listed companies comprising True Corp, Kasikornbank, Major Cineplex, Asia Aviation, G J Steel and Bangkok Bank. One filing claimed Ms Supaporn acquired an additional 3.2174% stake in True on June 15 through UBS Group AG, raising her total holding to 7.0992%. Based on the market value at the time, the reported stake was estimated at around 30 billion baht, making her appear to be the sixth-largest shareholder of the telecom company. Combined with the other reported holdings, the filings implied ownership of shares worth roughly 94 billion baht, attracting immediate attention across the market. According to the SEC, on July 3 the regulator marked the filings a "preliminary version" while conducting further verification. Between July 7-8, the SEC coordinated with the listed companies and examined shareholder registers. The investigation found no evidence that the reported holdings existed. The regulator removed the filings from public disclosure, labelled them "under verification", and later deleted them from the system. On July 9, Mrs Pornanong told reporters public feedback is welcome and would improve the system. As self-reporting remains an internationally accepted standard, she noted the SEC has procedures to investigate irregular filings and remove inaccurate information once detected. On July 10, the agency confirmed it collaborated with the Economic Crime Suppression Division in questioning Ms Supaporn as part of a formal investigation. Details of her testimony cannot be disclosed as the investigation remains ongoing, with the SEC adding it is too early to conclude whether anyone acted with intent to manipulate share prices. HOW DID THE FALSE FILING AFFECT THE MARKET? The incident did not trigger a broad market disruption, but it highlighted how false disclosure can influence investor sentiment. On the day the filings attracted widespread attention, TRUE was among the most actively bought stocks, reflecting speculative interest generated by the reports, though other companies named in the filings experienced limited price impact. Although regulators have not concluded that market manipulation occurred, the episode demonstrated how inaccurate regulatory disclosures can influence trading decisions before verification is completed. WHAT ARE THE DIFFERENCES BETWEEN THE THAI AND US SELF-REPORTING RULES? The SEC emphasised that Thailand's framework mirrors the approach used by its US peer. The US Electronic Data Gathering, Analysis and Retrieval (EDGAR) filing system also relies on self-reporting. Filings such as Schedule 13D, Schedule 13G, and Schedule TO are published promptly after submission rather than being pre-approved by regulators. The US has also experienced cases involving false filings. Fraudsters have submitted fake takeover documents and, in some cases, false Schedule 13D filings to create the illusion that major investors were accumulating shares, encouraging retail investors to buy and artificially inflating stock prices. Rather than abandoning the self-reporting model, the US SEC has responded with aggressive enforcement, pursuing both civil and criminal actions, imposing substantial financial penalties, and strengthening surveillance using data analytics, artificial intelligence and the EDGAR Next identity verification initiative. The challenge is not a lack of self-reporting, but concerns how quickly regulators can detect false information and how severely they punish those responsible. WHAT DO MARKET PARTICIPANTS RECOMMEND? The Supaporn case has prompted calls from market participants to strengthen Thailand's disclosure framework without sacrificing timely information. One proposal is to connect Form 246-2 directly with shareholder records maintained by Thailand Securities Depository (TSD), allowing the system to verify whether the reported holdings actually exist before publication. Rongrak Phanapavudhikul, senior executive vice-president and c