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. The P/E ratio stands at 21, while its peers, such as Grand Canyon Education, Inc. and Shift4 Payments, Inc., have P/E ratios of 33.38 and 14.01, respectively. Additionally, Constellium's EV to EBITDA ratio is 6.09, compared to the higher industry average, indicating a premium valuation.
In terms of performance, Constellium SE has shown a year-to-date return of 48.88%, significantly outperforming the S&P 500's 13.30% during the same period. However, over the longer term, the company's 3-year return of 30.57% pales in comparison to the S&P 500's 81.19%, suggesting that while it has had a strong recent performance, its valuation may not be justified when viewed against its peers and historical performance.