Anthem Inc. is an American health insurance company founded in the 1940s, prior to 2014 known as WellPoint, Inc. It is the largest for-profit managed health care company in the Blue Cross and Blue Shield Association. It was formed when Anthem Insurance Company acquired WellPoint Health Networks, Inc., with the combined company adopting the name WellPoint, Inc.; trading on the NYSE for the combined company began under the WLP symbol on December 1, 2004. On December 3, 2014, WellPoint changed its corporate name to Anthem Inc, and its NYSE ticker changed from WLP to ANTM. Anthem Insurance Company grew out of two Indianapolis, Indiana based mutual insurance companies, Mutual Hospital Insurance Inc. and Mutual Medical Insurance Inc. formed in 1944 and 1946. The companies grew significantly, controlling 80% of the medical insurance market in Indiana by the 1970s. In 1972 they came together to create a joint operating agreement, and merged in 1985 as parent company, Associated Insurance Companies, Inc, to form Blue Cross and Blue Shield of Indiana. In 1986 Associated Insurance Companies changed its name to The Associated Group (TAG) to reflect its expanded focus, and began heavily expanding outside Indiana, acquiring numerous insurance companies and creating new subsidiaries throughout the late 1980s through the mid-1990s.