San Diego, CA -- (SBWIRE) -- 05/22/2012 -- An investigation on behalf of investors in NYSE:OMG shares over potential breaches of fiduciary duties by certain directors of OM Group, Inc. was announced and current long-term NYSE:OMG stockholders should contact the Shareholders Foundation. Read the full press release at http://www.sbwire.com/press-releases/om-group-inc-nyseomg-investor-alert-investigation-over-potential-wrongdoing-by-directors-143833.htm