National Iranian South Oil Company

The National Iranian South Oilfields Company (NISOC) (Persian: شرکت ملی مناطق نفت‌خیز جنوب ایران, Shirkat-e Mily-e Minatâq-e Nuftxiz-e Jinvâb-e Iran) is a government-owned corporation under the direction of the Ministry of Petroleum of Iran, and operates as a subsidiary of National Iranian Oil Company. NISOC was incorporated in 1971 in Masjed Soleyman, Khouzestan as Oil Service Company of Iran (OSCO).

Source: Wikipedia — National Iranian South Oil Company (CC BY-SA 4.0)