Cohen Milstein has filed an antitrust class action lawsuit on behalf of all individuals and entities that purchased caustic-calcined magnesium oxide and/or dead-burned magnesium oxide (collectively "MgO") in the United States from Premier Chemicals, LLC, Sumitomo Corporation of America, and Yas, Inc. ("Defendants"), their predecessors, subsidiaries, or co-conspirators from at least January 1, 2001 through the present (the "Class Period").  Plaintiff alleges that during the Class Period, defendants conspired to fix, raise, maintain, or stabilize prices for MgO sold in the U.S. and also allocated customers among themselves in violation of Section 1 of the Sherman Antitrust Act.  As a result of defendants' unlawful conduct, Plaintiff and the Class members paid more for MgO than they would have absent defendants' illegal conduct.