Caterpillar Inc. is an American company headquartered in Peoria, Illinois. This company is often referred to as CAT. The company was founded in 1925 and is engaged in heavy engineering, in particular, the production of earthmoving machinery (bulldozers, excavators) and machinery for mining. Also important is the production of diesel and gas engines and gas turbines for various uses. Caterpillar is one of the 30 companies included in the Dow Jones Industrial Average.