OMC OMC NYSE:OMC OMC OMC NYSE:OMC NYSE:OMC NYSE:OMC View OMC Stock Research & Analysis OMC NYSE:OMC OMC NYSE:OMC NYSE:OMC OMC OMNICOM GRP Quote Omnicom Group Inc. Quote OMC OMC OMNICOM GRP Quote NYSE:OMC OMC NYSE:OMC NYSE:OMC OMC OMC NYSE:OMC NYSE:OMC