Several other petrochemical companies from other countries have also assured the US government that they are not selling refined fuel products to Iran.
In order to raise pressure on the Iran government to give up its alleged nuclear weapons programme, the US has been aggressively urging foreign governments to avoid commercial activity in Iran.
"Companies are recognising the increased risks of doing business in Iran and terminating their operations there or committing not to engage in any new activities in Iran," the State Department said.
French oil group Total, Royal Dutch Shell, Kuwait's Independent Petroleum Group, informed the State Department that they have stopped refined product sales to Iran earlier this year.
Turkish refiner Tupras told the State Department, that it had cancelled contracts to supply gasoline to Iran.
Even, Swiss energy traders Vitol, Glencore, and Trafigura all gave a public commitment in Mar, 2010, that they will not supply refined petroleum products to Iran,