LITTLE ROCK, Ark., May 8, 2015 (SEND2PRESS NEWSWIRE) -- Arkansas Mutual Insurance Company announced today that it will be joining Constellation, a mutual holding company, and its family of companies. Arkansas Mutual is a provider of medical professional liability insurance for physicians, located in Little Rock; it will be the third Constellation member company, joining MMIC and UMIA. The terms of the transaction were not disclosed.