Pakistan State Oil (PSO) is the largest state-owned energy company in Pakistan, established in 1976. Headquartered in Karachi, PSO holds a significant market share of approximately 51.6% in the country's downstream oil sector, serving around 3 million customers daily. The company operates an extensive network of over 3,580 retail outlets, 19 depots, and refueling facilities at 14 airports, making it a key player in fuel distribution.

PSO markets a wide range of petroleum products, including gasoline, diesel, jet fuel, and liquefied petroleum gas (LPG). It supplies fuel to various sectors such as industrial, aviation, and marine, and also offers non-fuel retail services. The company supports its customers with a mobile app and call centers, ensuring efficient service and distribution. With the largest fuel storage capacity in Pakistan at 1.24 million tons, PSO plays a vital role in meeting the energy needs of the nation.