MKS INSTRUMENTS INC (MKSI) Institutional Ownership and Insiders Activity

MKS INSTRUMENTS INC (MKSI) is widely held by institutional investors, with 2 tracked firms reporting positions valued at approximately $18.84M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Renaissance Technologies LLC is the largest disclosed holder, reporting approximately $17.97M in MKSI holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Renaissance Technologies LLC representing the majority of disclosed value.

Recent insider activity includes 19 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.