OMC +3.9%. Stagwell +75.1%, Groupon −18.3%, Criteo −24.0%, VS MEDIA −37.3%. Weekly closes, Oct 17, 2025 = 100, log scale.

End-of-day closes (Databento EOD), the last close of each week. The four peers are the largest US-listed companies by market value in OMC’s SEC industry (Services-Advertising Agencies) with a year of closes. It shows what the closes did; a move here is not a cause, a forecast or a call.