Is MasTec, Inc. overvalued or undervalued?

As of 31 October 2025, the valuation grade for MasTec, Inc. has moved from fair to expensive, indicating that the stock is overvalued. The company exhibits a P/E ratio of 60, a Price to Book Value of 5.55, and an EV to EBITDA of 18.89, all of which suggest a high valuation compared to its peers. For instance, EMCOR Group, Inc. has a P/E ratio of 29.12 and Comfort Systems USA, Inc. has an EV to EBITDA of 26.63, both indicating more attractive valuations in comparison.
Despite the recent overvaluation, MasTec has shown strong performance with a year-to-date return of 43.61%, significantly outperforming the S&P 500's return of 16.30% over the same period. However, the overall metrics suggest that investors may be paying a premium for the stock at this time.