Is Post Holdings, Inc. overvalued or undervalued?

As of 17 October 2025, the valuation grade for Post Holdings, Inc. has moved from fair to attractive, indicating a more favorable assessment of its value. The company appears to be undervalued, especially when considering its P/E ratio of 22, which is lower than the peer average of 20.40 for similar companies, and its EV to EBITDA ratio of 11.35, which is also competitive within the industry. Additionally, the PEG ratio of 3.53 suggests that the stock may be undervalued relative to its growth expectations.
In comparison to its peers, The J. M. Smucker Co. has a higher P/E of 23.79, while Conagra Brands, Inc. stands out with a very attractive P/E of 8.91, indicating a significant valuation difference. Notably, Post Holdings has underperformed the S&P 500 over the last year, with a return of -8.72% compared to the index's 14.08%, but it has shown resilience over the longer term with a 5-year return of 73.60% against the S&P's 91.29%.