A. O. Smith Corporation, with headquarters in Milwaukee, Wisconsin, U.S.A. is a multinational company with a history of 149 years. It is a global leader applying innovative technology and energy-efficient solutions to products manufactured and marketed worldwide. A. O. Smith has become one of the largest manufacturers of residential and commercial water heating equipment, water treatment products and boilers in North America. It is listed on the New York Stock Exchange (NYSE: AOS) and became a member of the S&P 500 Index in 2017.