MKS INSTRUMENTS INC (MKSI) Institutional Ownership and Insiders Activity

MKS INSTRUMENTS INC (MKSI) is widely held by institutional investors, with 757 firms reporting positions valued at approximately $31.02B based on SEC Form 13F filings for the quarter ended June 30, 2026.

Blackrock, Inc. is the largest disclosed holder, reporting approximately $3.08B in MKSI holdings in its latest filing.

Recent insider activity includes 3 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.