The Thailand Securities and Exchange Commission has launched a public consultation on proposed amendments to the prohibited characteristics of major shareholders of securities business operators, derivatives business operators and digital asset business operators. The changes would broaden and clarify suitability screening for major shareholders, introduce a unified standard across all three types of firms, and strengthen checks aimed at preventing unsuitable persons from being involved in these businesses. The proposal would expand the assessment to cover money laundering offences, as well as offences relating to the financing of terrorism and the proliferation of weapons of mass destruction, both in Thailand and overseas. Serious offences under all laws supervised by the SEC would also be taken into account to address cross sector risks linked to interconnected business activities. The principles were approved in principle by the SEC Board and the Capital Market Supervisory Board in April 2026, and transitional provisions would give firms and major shareholders time to prepare before the amendments take effect. The consultation runs until 28 May 2026.