About the Agency

The organization was established by the States Signatories to the Comprehensive Nuclear-Test-Ban Treaty (CTBT) in 1996.

• Its primary goals are to promote the CTBT’s entrance into force and to set up a worldwide verification framework in advance of the Treaty’s entry into force.
• The commission is composed of two main organs
  1. Plenary Body
  2. Provisional Technical Secretariat.

Members

• All States Signatories to the CTBT are automatically members of the CTBTO Preparatory Commission.
• As of 2023 there are 186 Member States of the CTBTO Preparatory Commission
• Of these, 177 have ratified the Treaty.
• The latest state to ratify the Treaty was Solomon Islands, on 20 January 2023.