All 143 members of parliament from the court-dissolved Move Forward Party (MFP) joined their new political home on Friday, with the main opposition's Facebook page renamed to the People's Party.
It will be a party by the people, for the people to create a Thailand where the highest power will belong to the people, the party said in a post on Facebook while announcing its name and new logo.
On Thursday night, former key members and MPs of Move Forward selected Natthapong Ruengpanyawut, a list MP and former deputy secretary-general, as the new leader.
The 37-year-old computer engineering graduate from Chulalongkorn University entered politics in 2019 with the Future Forward Party before it was dissolved by the Constitutional Court in 2020.
Mr Natthaphong said a gathering of all MPs at the new headquarters strengthened his resolve to carry on the work of Move Forward. Further details would be shared at an official press conference, he added.
On Wednesday, the Constitutional Court found Move Forward guilty of jeopardising the constitutional monarchy and national security because it proposed to amend Section 112 of the Criminal Code, also known as the lese-majeste law. As a result, the court dissolved the party and banned its 11 executives from politics for 10 years.