Form SC 13G/A OM GROUP INC Filed by: FMR LLC May 11, 2015 09:18AM
Form SC 13G/A OM GROUP INC Filed by: FMR LLC Feb 13, 2015 10:31AM
FMR LLC Lowers Stake in OM Group, Inc. (OMG) to 9.23% Sep 12, 2011 05:15PM