Currently, the largest professional wrestling company worldwide is the United States-based WWE, which bought out many smaller regional companies in the late 20th century, as well as its primary US competitors WCW and Extreme Championship Wrestling (ECW) in early 2001. Other prominent professional wrestling companies worldwide include the US-based Total Nonstop Action Wrestling (TNA) and Ring of Honor (ROH), Consejo Mundial de Lucha Libre (CMLL) and Asistencia Asesoría y Administración (AAA) in Mexico, and the Japanese New Japan Pro Wrestling (NJPW), All Japan Pro Wrestling (AJPW), and Pro Wrestling Noah (NOAH) leagues.