OMC ▼ -2.5% - Omnicom Group Inc. $OMC - OMNICOM TO PRESENT AT THE GOLDMAN SACHS COMMUNACOPIA + TECHNOLOGY CONFERENCE Omnicom Group fell 2.5% today despite announcing it will present at the Goldman Sachs Communacopia + Technology Conference. The stock decline appears unrelated to the conference presentation itself, which is a routine investor relations event. 04-SEP-2026 09:32 AM ET