Is AECOM overvalued or undervalued?

As of 24 October 2025, AECOM's valuation grade has moved from very expensive to expensive, indicating a slight improvement in its perceived value. The company appears to be overvalued based on its current metrics, with a P/E ratio of 20, a Price to Book Value of 6.45, and an EV to EBITDA of 13.73. In comparison, peers such as EMCOR Group, Inc. have a P/E of 29.12, while Comfort Systems USA, Inc. shows a significantly higher P/E of 38.72, suggesting that AECOM's valuation is not as aggressive as some competitors but still elevated.
Despite its strong performance, with a year-to-date return of 24.40% compared to the S&P 500's 15.47%, the high valuation ratios indicate that AECOM may not offer sufficient upside potential at its current price of 132.88. The PEG ratio of 0.16 suggests that growth expectations may not be fully reflected in its price, reinforcing the notion that the stock is overvalued relative to its growth prospects.