Is MKS Instruments, Inc. overvalued or undervalued?

As of 24 October 2025, the valuation grade for MKS Instruments, Inc. has moved from attractive to fair. The company appears to be fairly valued based on its current metrics, including a P/E ratio of 19, an EV to EBITDA of 11.18, and a PEG ratio of 0.30. In comparison to peers, Woodward, Inc. is considered expensive with a P/E of 42.20, while Graco, Inc. is rated fair with a P/E of 29.51.
Recent performance shows that MKS Instruments, Inc. has outperformed the S&P 500, with a year-to-date return of 36.93% compared to the S&P 500's 15.47%. This strong performance reinforces the narrative that the stock is fairly valued in the current market environment.