Is Omnicom Group, Inc. overvalued or undervalued?

As of 17 October 2025, the valuation grade for Omnicom Group, Inc. has moved from very expensive to attractive, indicating a shift towards a more favorable assessment. The company appears undervalued, supported by a P/E ratio of 13, an EV to EBITDA of 8.90, and a robust ROE of 36.44%. In comparison, peers such as Interpublic Group of Cos., Inc. have a higher P/E of 12.38, while QuinStreet, Inc. is considered expensive with a P/E of 44.57.
Despite the attractive valuation, Omnicom has underperformed relative to the S&P 500, with a year-to-date return of -9.90% compared to the index's 13.30%. Over the longer term, however, the company has shown resilience with a 5-year return of 47.71%, albeit still trailing the S&P 500's 91.29% over the same period.