Midstream companies are essential players in the energy sector, primarily involved in the transportation, storage, and processing of oil and natural gas. They act as a bridge between the upstream sector, which focuses on exploration and production, and the downstream sector, which deals with refining and selling products. These companies operate pipelines, storage facilities, and processing plants, ensuring that energy resources move efficiently from production sites to consumers. By managing the logistics of energy distribution, midstream companies help stabilize supply chains and maintain the flow of energy in the market.