LongMKSIJune 30, 2026

Keeley Small Cap Fund on MKS Instruments Inc.

Thesis

MKS supplies critical vacuum, photonics, materials, and precision technologies used in semiconductor manufacturing and advanced packaging. The company is benefiting from a cyclical recovery in memory equipment and the increasing complexity of AI chip production. Balance-sheet deleveraging after the Atotech acquisition provides an additional catalyst.

“MKS is benefiting from both a cyclical recovery in NAND/memory equipment as well as increasing complexity in AI chip manufacturing processes.”
Keeley Small Cap Fund — Gabelli Funds Shareholder Commentary - Open-End Funds

Key risks

  • Debt from the Atotech acquisition

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