The Port Moresby Stock Exchange (POMSoX) was incorporated as a private company on the January 26, 1998. POMSoX is closely aligned with the Australian Stock Exchange (ASX) in several ways. The ASX has licensed to the POMSoX its business and listing rules. In addition, POMSoX procedures are a mirror image of the ASX.
POMSoX formally opened on the April 28, 1999. On the June 4, 1999, the Securities Commission of Papua New Guinea formally approved POMSoX as a stock exchange. The approval enabled POMSoX to commence live trading operations.
In 2019, the name was offically changed to the PNG Exchange Market.