Is Koppers Holdings, Inc. overvalued or undervalued?

As of 17 October 2025, Koppers Holdings, Inc. has moved from a fair to an expensive valuation grade. The company appears to be overvalued based on its current metrics, including a P/E ratio of 9, a Price to Book Value of 1.47, and an EV to EBITDA of 6.19. In comparison to peers, Koppers has a lower P/E ratio than Kronos Worldwide, Inc., which stands at 10.01, but is higher than Tronox Holdings Plc, which has a negative P/E ratio.
The stock has underperformed against the S&P 500 across multiple time frames, with a year-to-date return of -17.47% compared to the S&P 500's 13.30%. This trend reinforces the conclusion that Koppers Holdings, Inc. is currently overvalued in the market.