Member countries of the NEAT are the ASEAN Plus Three (APT) countries, namely: Brunei, Cambodia, China, Indonesia, Japan, Korea, Lao PDR, Malaysia, Myanmar, Philippines, Singapore, Thailand, Viet Nam. The NEAT consists of think-tanks designated by the APT Governments.

The founding members of NEAT are:

• Brunei Darussalam Institute of Policy and Strategic Studies, Ministry of Foreign Affairs, Brunei;
• General Department of ASEAN, Ministry of Foreign Affairs and International Cooperation, Cambodia;
• Center for East Asian Studies, China Foreign Affairs University, China;
• Center for East Asian Cooperation Studies, University of Indonesia, Indonesia;
• The Japan Forum on International Relations, Inc., Japan;
• Korean Institute of South East Asian Studies (KISEAS), Korea;
• Institute of Foreign Affairs, Ministry of Foreign Affairs, Laos;
• Institute of Strategic and International Studies (ISIS), Malaysia;
• Myanmar Institute of Strategic and International Studies (MISIS), Myanmar;
• Philippine Institute for Development Studies, Philippines;
• East Asian Institute, National University of Singapore, Singapore;
• Institute of East Asian Studies, Thammasat University, Thailand; and
• Institute for International Relations (Diplomatic Academy of Vietnam), Ministry of Foreign Affairs, Vietnam.

Information about the Country Coordinators and member institutions can be found in Country Coordinators and Member Institutions.