MKS INSTRUMENTS INC (MKSI) Institutional Ownership Changes & 13F Activity

MKS INSTRUMENTS INC (MKSI) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC, Sequoia Financial Advisors, First Eagle U.S. Value, Hancock Classic Value, and Torray Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2014Renaissance Technologies LLCBuy112,000146,852$4,588
Q1 2014Renaissance Technologies LLCSell-82,91934,852$1,042
Q2 2013Renaissance Technologies LLCBuy117,771117,771$3,126

Frequently asked questions about MKSI activity

  • Which institutional owners are buying MKSI?

    Institutional owners buying MKSI include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MKSI activity?

    "Buy" means an investor increased their reported position in MKSI compared to the prior reporting period. This reflects growing exposure to MKS INSTRUMENTS INC (MKSI) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MKSI increasing?

    Institutional interest in MKSI can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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