PHOENIXVILLE, Pa.--(BUSINESS WIRE)--The Young Law Center LLC (the “Firm”), a shareholder litigation firm, is investigating potential claims concerning the proposed acquisition of OM Group, Inc (“OM Group” or the “Company”) (NYSE: OMG). On or about June 1, 2015 the Company announced it had entered into a definitive agreement to be acquired by funds managed by affiliates of Apollo Global Management, LLC (NYSE: APO) for $34.00 per share in cash. The Firm’s investigation concerns whether the propos