 It was acquired by Rolls-Royce North America, and in 2014 Siemens bought the Mount Vernon plant.Facing a declining market, Siemens announced major reductions in employment in October 2016 and in 2018 announced their Mount Vernon facility would close by 2019.Ariel Corporation, a major manufacturer of reciprocating natural gas (and other gasses) compressors, is also located in Mount Vernon.