Oil Search listed on the ASX in 1974. It is also listed on the PNG share market and its ADRs trade on the United States over-the-counter market. Today, Oil Search operates all of PNG’s producing oil fields. It is also the largest company in PNG and its biggest investor, holding a 29% share of the ExxonMobil-operated PNG LNG Project. In 2018, Oil Search acquired and now operates a portfolio of oil leases in Alaska, United States.