Advent Acquires Majority Stake in GMD for US$84.7m June 6, 2017 Advent International purchased a majority stake in Peruvian IT service firm GMD for US$84.7m from Graña y Montero. (Press Release) Graña y Montero S.A.A. (NYSE:GRAM) (BVL:GRAMONC1) ( “the Group” or…