Petróleos Mexicanos or Pemex (, Mexican Petroleum) is a Mexican state-owned petroleum company. Pemex has a total asset worth of $415.75 billion, and is the world's second largest non-publicly listed company by total market value, and Latin America's second largest enterprise by annual revenue as of 2009. However, the majority of its shares are non-publicly listed and under control of the Mexican government. The value of its publicly listed shares totalled $102 billion in 2010, representing approximately one quarter of the company's total worth.
Read more about Pemex: History