PENGARUH KEPEMILIKAN MANAJERIAL DAN KARAKTERISTIK DIREKSI TERHADAP UNDERPRICING SAHAM IPO (INITIAL PUBLIC OFFERING) TERDAFTAR DI BURSA EFEK INDONESIA PERIODE 2012 - 2016 = The Impact of Managerial Ownership and Board of Directors Characteristics on IPO Underpricing of Companies Listed on Indonesia Stock Exchange during the Period of 2012 – 2016