Is Constellium SE overvalued or undervalued?

As of 22 August 2025, the valuation grade for Constellium SE has moved from fair to very expensive, indicating a significant shift in its valuation outlook. The company appears overvalued based on its current metrics, with a P/E ratio of 21, a Price to Book Value of 2.48, and an EV to EBITDA of 6.09. In comparison, peers such as Grand Canyon Education, Inc. have a P/E of 33.38 and an EV to EBITDA of 23.11, while Shift4 Payments, Inc. shows a more attractive P/E of 14.01 and an EV to EBITDA of 12.20, highlighting that Constellium's valuation is not justified relative to its industry counterparts.
Additionally, while Constellium has shown strong returns year-to-date at 59.30%, it has underperformed the S&P 500 over the 1Y and 3Y periods, with returns of -2.39% and 42.88% respectively, compared to 17.14% and 70.41% for the index. This underperformance further supports the notion that the stock may be overvalued at its current price.