Thai capital market regulation

This comprehensive analysis examines market regulation in the light of the legislation in force and of regulatory reforms. It covers the procedures for licensing professional market participants and the capital adequacy standards. Beyond that, it sets out IPO rules and the mechanisms for handling infrastructure funds and REIT instruments.

Statutes and state regulators governing the Thai capital market

Thai market regulation is built on a strict division of powers among specialised state agencies. The Securities and Exchange Commission of Thailand (SEC) holds principal supervisory authority and works through three tiers of governance. Strategic decisions are the SEC Board's responsibility. The Thai SEC's rule-making body for securities issuance and trading is the Capital Market Supervisory Board. Operational inspections of market participants rest with the SEC Office, which also applies sanctions.

The Ministry of Finance of Thailand also has significant powers: statute authorises it both to grant and to revoke licences for financial business. For its part, the Bank of Thailand (BOT) handles three areas of financial-market regulation. These are exchange control, the monitoring of cross-border movements of funds and rules for dealings in stablecoins pegged to the national currency.

Special capital market statutes, each dealing with its own field, make up the jurisdiction's legal foundation:

Digital-asset FinTech businesses belong to a separate regulatory perimeter. The Emergency Decree on Digital Asset Businesses B.E. 2561 (the Decree) regulates their activity.

On August 25, 2026 the Thai Cabinet approved a package of wide-ranging legislative reforms. At present the package remains at the bill stage. Statutes now in force will not change until the bills have been fully passed by Parliament and signed by the King, and have then appeared in the Royal Gazette.

Licensing on the Thai capital market: requirements for financial companies

The classification of regulated activities covers brokerage, dealing and underwriting. It also extends to investment advice and to mutual and private fund management. Only juristic persons incorporated as public or private limited companies may apply to the regulator.

An applicant's financial soundness is measured against its paid-up registered capital. The business scope chosen and access to client money determine which threshold applies:

• investment advice with no right to hold client money, THB 1 million;
• mutual fund or private fund management serving institutional investors only, without custody of client assets, THB 10 million;
• management of retail mutual funds, THB 25 million;
• brokerage in agricultural derivatives, THB 50 million;
• full brokerage, dealing and underwriting, direct participation in clearing systems or client-asset custody, THB 100 million.

The Net Capital Rule obliges financial companies to maintain liquid assets net of risk haircuts. Once the net capital ratio (NCR) falls to 10.5% or net capital declines to THB 22.5 million, the SEC places the company under an early-warning regime. Below a ratio of 7%, or once net capital drops to THB 15 million, the company may no longer open new positions and must transfer client accounts to an outside operator.

The Thai SEC examines the infrastructure of each licence applicant in detail. Each applicant must establish independent risk management systems and must keep proprietary funds segregated from client assets. Appointing a compliance officer is mandatory as well. Executives and key staff need approval, which requires a clean criminal record and relevant financial-sector experience.

Rules on responsible business conduct, effective April 1, 2026, have moved the focus of supervision onto the boards of financial companies. Each board is directly accountable for transparent pricing, for matching products to clients' investment profiles and for preventing conflicts of interest.

Thai financial companies: key requirements for licensing and capital

Raising capital in Thailand: equity, debt and other instruments

Thai legislation sets the procedure by which capital is raised, whether through public or through private structures. Companies obtain capital via initial and secondary public offerings and via private placement. Existing holders receive additional securities through a rights offering, while staff incentive programmes rely on ESOPs and on the grant of warrants.

No public issue of securities can proceed in Thailand without mandatory regulatory clearance. The issuer must place its registration statement and draft prospectus on file at the SEC Office. Under the PP10 regime private placements are capped at 10 investors, and issuers using it are exempt.

Issuers structure debt instruments with the category of their future holders in mind. Corporate bond issues in Thailand range across short-term bills, perpetual subordinated instruments, structured notes and Islamic sukuk. Placing shares and debt obligations is a stepwise process that requires meeting specific conditions:

• a financial evaluation covering the issuer's three prior years;
• credit rating of debt issues aimed at retail investors;
• designation of an official bondholders' representative;
• the setting of transfer restrictions;
• implementation of mechanisms for disclosing material facts once the offering is complete.

Legal regimes differ between the securities of new and of existing issuers. One rule protects existing shareholders: if shares are placed privately in Thailand at a below-market price, the placement requires approval by at least 75% of the votes of those attending the shareholders' meeting. Approval also requires that holders whose stakes together amount to 10% or more raise no objection.

Foreign juristic persons may tap the capital market in Thailand with bond issues denominated in baht or in other currencies. Separately, a foreign issuer seeking a Thai IPO must disclose under Thai Financial Reporting Standards (TFRS) or IFRS. Such an issuer also has to confirm that the law of its home jurisdiction imposes no statutory limit on repatriating funds.

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Requirements for public issuers listing on SET

The central organised venue for share trading is the Stock Exchange of Thailand (SET). Alongside it operate the Market for Alternative Investment (mai) for companies of smaller scale and LiVEx, a platform dedicated to SMEs and start-ups.

Requirements for new SET issuers were substantially revised from January 1, 2025. Under the profit-based test, an ordinary Thai operating company seeking a share listing has to clear the equity and post-offering paid-up capital floors below, with mai applying lower ones. Equity may not turn negative before filing. The financial position must also be sufficient to support adequate working capital.

SET and mai: financial listing criteria (minimums)

Each applicant must additionally show a positive balance of accumulated net profit up to filing. Thai listing rules offer an alternative market capitalisation test for issuers in designated target industries. On SET, capitalisation must reach at least THB 5 billion for companies without special status and THB 3 billion for projects satisfying BOI or EEC criteria, while mai applies separate lower values. This route allows some fast-growing companies to be assessed without being required to pass the standard historical profit test.

At the IPO stage the spread of shares among minority holders undergoes a separate check. A SET listing requires no fewer than 1,000 such shareholders, while on mai the minimum is 300. The required aggregate free float depends on paid-up capital.

Once listed, the issuer becomes bound by a separate continuing standard, under which 150 or more minority shareholders must between them own a paid-up capital stake of 15% or more.

For as long as its shares trade, an issuer has to keep meeting corporate requirements. At least a third of board seats must go to independent directors, three being the minimum, and the audit committee must include three persons or more. Every issuer must run an internal control system and engage an auditor that holds Thai SEC approval. Should the continuing free float standard be breached, SET applies staged measures. First a CF sign is posted, then trading may be suspended if the breach persists into the following period, and continued non-compliance gives grounds for delisting proceedings.

Public company transactions: material deals, shareholder protection and related parties

The legal regime for transactions of Thai public companies underwent an update on July 1, 2026: the Thai SEC revised its rules on material transactions (MTs) and on related party transactions (RPTs).

Four methods determine the size of a transaction, each with its own base: net tangible assets, net operating profit, the total consideration paid or, for shares the company issues as payment, their value. Regulatory rules require all similar transactions that the company has made within the preceding 12 months to be added up, and the highest of the resulting values applies.

The approval route follows the percentage obtained:

• below 25%, the board decides, with mandatory disclosure through the exchange;
• from 25% to under 50%, the board must approve the deal, it must be disclosed, and a simple majority of shareholders must consent;
• at 50% or more, engaging an independent financial adviser (IFA) and obtaining shareholder approval become mandatory, while the company is further required to publish reports on the transaction's progress.

Companies with negative equity or chronic losses face special thresholds of 10% and 25%, which are stricter than the standard 25% and 50%. Of particular significance is the rule under which minority shareholders whose votes together reach 10% can block a transaction at the general meeting. Investors may exercise this veto where the IFA or the audit committee has given a negative opinion regarding the proposed transaction.

Votes on MTs call for a qualified majority. A three-quarter majority of votes held by attending shareholders with voting rights carries the resolution, and ballots cast by interested persons are excluded from the count. The SEC retains the right to apply substance over form and may treat a chain of formally independent contracts as one connected transaction.

Requirements placed on market participants: disclosure, compliance and liability

Professional participants and issuers draw up financial statements in strict conformity with TFRS, which are adapted to IFRS. Audit firms accredited by the regulator examine those statements.

In Thailand, firms build internal compliance on KYC/CDD standards for identifying clients and their beneficial owners. Supervisory standards oblige financial companies to trace the source of funds and to establish who ultimately owns and controls the client for as long as the relationship lasts. Updated rules on vetting major shareholders, in force from March 4, 2026, extend to persons who provide shadow financing to buy stakes.

The law divides market misconduct into four categories:

• false information (Sections 240 and 241), meaning the dissemination of distorted information capable of affecting securities prices;
• insider trading (Section 242), meaning trading or the passing on of confidential information before its official release;
• front-running, where a broker puts its own orders ahead of client orders that have priority;
• market manipulation, meaning fictitious trades whose purpose is to create a false appearance of active trading.

Penalties in Thailand combine administrative measures and criminal prosecution with a mechanism of civil sanctions. Using civil measures, the Thai SEC's Civil Sanction Committee may recover unlawful gains and impose monetary penalties. It may also impose a trading ban capped at five years and remove offenders from management positions. Enforcement practice in 2026 shows large monetary penalties being imposed regularly for market manipulation.

Criminal liability is pursued by passing case materials to the Department of Special Investigation (DSI) and to the Anti-Money Laundering Office (AMLO).

Digital assets and the 2026 reform of the Thai capital market

Thai regulation draws a line between traditional financial services and business in digital assets. Such business comes under the Decree, which applies to cryptocurrencies together with investment tokens and utility tokens.

Participants in this market hold separate licences according to their business model. The licensing regime extends to the activities below, each matched to its category in the official classification.

Licensed operators may neither accept nor use cryptocurrency in settlement of domestic purchases of goods or services. A separate set of requirements governs data accompanying transfers. Under the Travel Rule, each transfer must carry information about its originator and its beneficiary, whether domestic or international. The Thai SEC announced the rule on September 2, 2026, and it takes effect on February 27, 2027.

On September 3, 2026, the SEC Board approved conceptual principles for tighter supervision of operators that use stablecoins. The public hearing scheduled for September concerns the drafting of secondary regulation, but does not amount to adopting a separate statute. Baht-backed stablecoins are a matter for the BOT under the Payment Systems Act.

The four-law government package, which the Cabinet adopted on August 25, 2026, envisages a far-reaching modernisation of finance in Thailand. Its draft amendments would introduce digital securities without paper certificates and bring providers of critical IT infrastructure under regulation. They would also extend the takeover rules and introduce Pinai regulatory fines, a sanction that Thai law classes as neither criminal nor administrative.