Is Constellium SE overvalued or undervalued?

As of 17 October 2025, the valuation grade for Constellium SE has moved from fair to very expensive. The company appears overvalued based on its current metrics, particularly when compared to its peers. The P/E ratio stands at 21, while the industry average is significantly higher at 59.55, indicating a stark discrepancy. Additionally, the EV to EBITDA ratio is 6.09, which is lower than several peers such as Grand Canyon Education, Inc. at 23.11, further supporting the overvaluation thesis.
Constellium SE's return performance has been mixed; while it has achieved a year-to-date return of 48.88%, it lags behind the S&P 500's 13.30% over the same period, and its 3-year return of 30.57% is notably less than the S&P 500's 81.19%. This underperformance, coupled with the high valuation ratios, reinforces the conclusion that Constellium SE is currently overvalued.