Is Constellium SE overvalued or undervalued?

As of 17 October 2025, the valuation grade for Constellium SE has moved from fair to very expensive, indicating a significant shift in its perceived value. The company is currently overvalued, as evidenced by its P/E ratio of 21, which is substantially lower than its peer average of 59.55, and an EV to EBITDA ratio of 6.09 compared to the industry average of 12.68. Additionally, the Price to Book Value stands at 2.48, suggesting that the stock is trading at a premium relative to its book value.
In comparison to its peers, Grand Canyon Education, Inc. has a P/E of 33.38 and an EV to EBITDA of 23.11, while Shift4 Payments, Inc. shows a P/E of 14.01 and an EV to EBITDA of 12.20, both of which highlight Constellium's relatively high valuation. Furthermore, while Constellium has performed well year-to-date with a return of 48.88% compared to the S&P 500's 13.30%, its longer-term performance over 3 years and 5 years shows a stark underperformance against the index, with returns of 30.57% and 69.89%, respectively, compared to 81.19% and 91.29% for the S&P 500.