NewMarket Corporation is a holding company operating through its subsidiaries, Afton Chemical Corporation (Afton), Ethyl Corporation (Ethyl), and American Pacific Corporation (AMPAC). The Afton and Ethyl companies develop, manufacture, blend, and deliver chemical additives that enhance the performance of petroleum products. AMPAC is a manufacturer of specialty chemicals used in solid rocket motors for the aerospace and defense industries. Its Petroleum Additives segment manufactures chemical components that are selected to perform one or more specific functions and combine those chemicals with other chemicals or components to form additive packages for use in specified end-user applications. Ethyl provides contracted manufacturing and related services to Afton and to third parties and is a marketer of antiknock compounds in North America. Its subsidiaries, NewMarket Services Corp, provide various administrative services; and NewMarket Development Corp, manages the real property.