Valero Energy Corp. engages in the manufacture and marketing of transportation fuels and other petrochemical products. It operates through the following business segments: Refining, Ethanol and Renewable Diesel. The Refining segment comprises of refining operations, associated marketing activities, and logistics assets that support its refining operations. The Ethanol segment includes its ethanol operations, associated marketing activities, and logistics assets that support its ethanol operations. The Renewable Diesel covers the operations of Diamond Green Diesel Holdings LLC. The company was founded in 1980 and is headquartered in San Antonio, TX.