MKS (MKSI) Could Be 35% Undervalued Following FTSE All World Index Inclusion

Index inclusion puts MKS on more investor screens

MKS (MKSI) was added to the FTSE All-World Index (USD) on 19 September 2026, an inclusion that can draw fresh attention from global index funds and benchmarked institutional portfolios.

MKS has ridden strong momentum this year, with a year-to-date share price return of 61.11% and a 1-year total shareholder return of 99.48%. This comes even after a 90-day share price decline of 25.80%, which hints at some reassessment of risk as the index inclusion lands on investor radars.

Scan how MKS compares to other fast moving semiconductor plays by reviewing our hand picked list of 90 AI infrastructure stocks sitting on institutional radars after recent index moves.

MKS now sits in a tricky spot, fresh off index inclusion and a sharp run despite a recent pullback. Does it make more sense to commit capital here or wait for a cleaner entry based on the numbers?

Most Popular Narrative: 35% Undervalued

MKS last closed at $271.24, while the most followed narrative points to a fair value of $417.57. This frames the recent index inclusion against a much higher modeled intrinsic value built on AI infrastructure demand and capacity expansion.

Ongoing investments in new fab buildouts and re-shoring of semiconductor manufacturing in the U.S. and Europe are creating a stable multi-year pipeline of equipment and service demand, providing visibility into recurring revenues and improved cash flow. The operational pivot toward a more stable, services-driven revenue mix (including higher-margin annuity-like service streams from the installed base) is increasing business resilience, supporting net margin expansion and reducing earnings volatility.

See why 15 investors see MKS as 35% undervalued.

Result: Fair Value of $417.57 (UNDERVALUED)

Still, the bullish MKS narrative relies on a highly cyclical semiconductor spending cycle and meaningful leverage, so weaker demand or tighter credit could quickly challenge those assumptions.

Find out about the key risks to this MKS narrative.

Another View on MKS Valuation

The narrative fair value pegs MKS at $417.57 and labels the stock as undervalued, yet the SWS DCF model tells a colder story. On that cash flow view, MKS is priced above an estimated value of $254.45, which points to an overvalued setup instead. Which lens do you trust more when the signals diverge this sharply?

Our DCF model is fully laid out for investors who want to pressure test those assumptions, so it is worth checking how sensitive the outcome is to growth and margin swings before leaning too heavily on either price tag in isolation. Look into how the SWS DCF model arrives at its fair value.

Simply Wall St performs a discounted cash flow (DCF) on every stock in the world every day (check out MKS for example). We show the entire calculation in full. You can track the result in your watchlist or portfolio and be alerted when this changes, or use our stock screener to discover 28 high quality undervalued stocks. If you save a screener we even alert you when new companies match - so you never miss a potential opportunity.

Next Steps

Mixed signals around MKS valuation and future cash flows can feel messy, so move quickly, review the underlying data, and weigh both the 3 key rewards and 1 important warning sign.

Looking for more MKS-sized investment ideas?

If you are weighing MKS and feel unsure about concentration risk, broaden your opportunity set and let data-driven filters surface fresh candidates worth your attention.

• Spot potential mispricings early by scanning a focused group of 19 high quality undiscovered gems that pair strong fundamentals with relatively low market attention.
• Build a more resilient portfolio by reviewing a curated 31 resilient stocks with low risk scores chosen for steadier earnings profiles and healthier balance sheets.
• Target quality at a discount by combing through a refined 28 high quality undervalued stocks where fundamentals and valuation metrics line up more cleanly.

This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.

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