NEW YORK--(BUSINESS WIRE)--Kirby McInerney LLP is investigating potential claims against the Board of Directors of OM Group. (“OMG” or the “Company”) (NYSE:OMG) concerning the proposed acquisition of the Company by funds managed by affiliates of Apollo Global Management, LLC. Pursuant to the terms of the definitive agreement, OMG stockholders will receive $34.00 in cash for each share of OMG common stock they own. The investigation concerns whether the OMG Board of Directors violated its fiduci