| Filed On | Filing |
|---|---|
| 22 Apr 2015 | DEF 14A |
| 03 Apr 2014 | FORM DEF 14A |
| 28 Mar 2013 | DEF 14A |
| 29 Mar 2012 | DEF 14A |
| 31 Mar 2011 | DEF 14A |
| 31 Mar 2010 | DEF 14A |
| 03 Apr 2009 | FORM DEF 14A |
| 01 Apr 2008 | OM GROUP, INC. DEF 14A |
| 27 Mar 2007 | OM GROUP, INC. DEF 14A |
| 30 Mar 2006 | OM GROUP, INC. DEF 14A |
| 01 Sep 2005 | OM GROUP, INC. DEFINITIVE PROXY |
| 03 Apr 2003 | OM GROUP, INC. 05-06-2003 |
| 05 Apr 2002 | OM GROUP DEFINITIVE PROXY STATEMENT |
| 02 Apr 2001 | PROXY STATEMENT |
| 23 Mar 2000 | DEFINITIVE PROXY STATEMENT |
| 02 Apr 1999 | OM GROUP, INC. FORM DEF 14A |
| 26 Mar 1998 | OM GROUP--DEFINITIVE PROXY |
| 21 Mar 1997 | OM GROUP / DEF 14A |
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