Is MKS Instruments, Inc. overvalued or undervalued?

As of 17 October 2025, the valuation grade for MKS Instruments, Inc. moved from very attractive to attractive, indicating a shift in perceived value. The company appears to be fairly valued based on its current metrics, with a P/E ratio of 19, an EV to EBITDA of 11.18, and a PEG ratio of 0.30, which suggests that the stock is reasonably priced relative to its growth potential. In comparison, peers such as Woodward, Inc. have a significantly higher P/E of 42.20, while The Middleby Corp. shows a more attractive P/E of 18.12.
MKS Instruments has demonstrated strong returns, outperforming the S&P 500 with a year-to-date return of 30.78% compared to the index's 13.30%. This performance reinforces the notion that the stock is currently fairly valued, especially when considering its competitive positioning within the industrial manufacturing sector.