There aren't too many, but Saudi Aramco, Statoil (until 2007, when it became the multinational Equinor), China Petrochemical, and a few other giant corporations

There aren't too many, but Saudi Aramco, Statoil (until 2007, when it became the multinational Equinor), China Petrochemical, and a few other giant corporations exist (or in the case of Statoil, recently existed). Corporations wholly owned by nations. I think that qualifies. Although I believe the parent was perhaps making a cynical comment about how e.g. Lockheed is basically a branch of the US military.