This document provides an overview of Pakistan State Oil (PSO), the largest state-owned oil and gas company in Pakistan. PSO was formed in 1974 through the merger of two state-owned oil companies. It has expanded to become vertically integrated across oil and gas exploration, production, refining, distribution, and marketing. PSO also engages in renewable energy activities. It has over 3,500 retail locations nationwide and supplies fuel to various sectors. PSO aims to become fully integrated across the energy value chain to reduce costs and dependence on imports.