Phillips 66 Company (NYSE: PSX) is an American multinational energy company headquartered in Westchase, Houston, Texas. It debuted as an independent energy company when ConocoPhillips executed a spin-off of its downstream and midstream assets. Taking its name from the 1927 "Phillips 66" trademark of ConocoPhillips predecessor Phillips Petroleum Company, Phillips 66 began trading on the New York Stock Exchange on May 1, 2012, under the ticker PSX.