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ARTICLE · 25 SEPTEMBER 2026

Thailand Seeks Comments On Proposed Merger Control And Market Dominance Rules

Tilleke & Gibbins
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Thailand's Trade Competition Commission has proposed significant amendments to its competition regulations, including lowering market dominance thresholds from 50% to 33% market share and reducing turnover requirements from THB 1 billion to THB 500 million. These changes would substantially expand merger filing obligations and introduce dynamic assessment criteria for rapidly evolving digital markets, potentially affecting a broader range of businesses under the country's competition framework.

ThailandAntitrust/Competition Law
Kobkit Thienpreecha
Kobkit Thienpreecha
Nutavit Sirikan
Nutavit Sirikan
Theerapun Akaradechakorn
Theerapun Akaradechakorn
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On September 22, 2026, the Trade Competition Commission of Thailand (TCCT) opened a one-month public consultation period on proposed amendments to three key competition regulations, covering (1) the criteria for determining market dominance, (2) the definition of “monopoly” under Thailand’s premerger approval regime, and (3) the definition of a merger that may substantially lessen competition under Thailand’s postmerger notification regime. The public hearing period closes on October 21, 2026.

The proposed changes could significantly affect merger filing obligations and the assessment of market dominance under the Trade Competition Act B.E. 2560 (2017) (TCA).

The scope of the consultation and the proposed changes are outlined below.

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