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The countries are New Zealand, Australia, Brunei Darussalam, Canada, Chile, Japan, Malaysia, Mexico, Peru, Singapore, the United States and Viet Nam.
The concluded TPP Agreement was signed in February 2016. New Zealand, which is the depository for the TPP, ratified the Agreement in May 2017. Japan has also ratified it.
However, the TPP Agreement cannot enter into force until it is also ratified by four other signatories, including the United States. The US has notified that it does not intend to become a party to the Agreement.
On 23 January 2018, negotiations were concluded on the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP). CPTPP entered into force on 30 December 2018.
Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP)
Resources
TPP Agreement ministerial statement - May 2017(external link)
TPP Depositary page contains the official text and the status of the Agreement.
An archived copy of the TPP website(external link) is available at the National Library of New Zealand.