Institutional shares held 70.6 Million
2.05M calls
371K puts
Total value of holdings $10.1B
$293M calls
$53M puts
Market Cap $9.49B
66,491,100 Shares Out.
Institutional ownership 106.25%
# of Institutions 488


Latest Institutional Activity in MKSI

Top Purchases

Q3 2025
Franklin Resources Inc Shares Held: 1.41M ($201M)
Q3 2025
Point72 Asset Management, L.P. Shares Held: 1.01M ($145M)
Q3 2025
Invesco Ltd. Shares Held: 2.38M ($340M)
Q3 2025
Millennium Management LLC Shares Held: 446K ($63.7M)
Q3 2025
Nomura Holdings Inc Shares Held: 427K ($60.9M)

Top Sells

Q3 2025
Barclays PLC Shares Held: 367K ($52.4M)
Q3 2025
Bank Of America Corp Shares Held: 428K ($61.1M)
Q3 2025
Price T Rowe Associates Inc Shares Held: 3.63M ($519M)
Q3 2025
Madison Asset Management, LLC Shares Held: 976K ($139M)
Q3 2025
Ubs Group Ag Shares Held: 654K ($93.3M)

About MKSI

MKS Instruments, Inc. provides instruments, systems, subsystems, and process control solutions that measure, monitor, deliver, analyze, power, and control critical parameters of manufacturing processes worldwide. Its Vacuum & Analysis segment offers pressure and vacuum control solutions, including direct and indirect pressure measurement; materials delivery solutions comprising flow and valve technologies, as well as integrated pressure measurement and control subsystems, which provide customers with precise control capabilities; power solutions products, such as microwave, power delivery systems, radio frequency matching networks, and metrology products used in providing energy to etching, stripping, and deposition processes; and plasma and reactive gas products. Its Light & Motion segment offers laser products, such as continuous wave and pulsed nanosecond, diode and diode-pumped solid-state, and fiber laser technologies; and photonics products comprising motion control, optical tables and vibration isolation systems, photonic instruments, optics and optical assemblies, opto-mechanical components, temperature sensing products for wafer fabrication systems, and laser and LED measurement products, including laser power and energy meters, laser beam profilers, and optical and photonic subsystems. Its Equipment & Solutions segment provides laser-based systems for printed circuit board (PCB) manufacturing, including flexible interconnect PCB processing systems and high-density interconnect solutions for rigid PCB manufacturing and substrate processing, and multi-layer ceramic capacitor test systems. It serves semiconductor, industrial technologies, life and health sciences, research, and defense markets. It sells its products and services through its direct sales organization, independent distributors, and sales representatives, as well as through its websites and product catalogs. The company was incorporated in 1961 and is headquartered in Andover, Massachusetts.


Insider Transactions at MKSI

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
View All Transactions

Last 12 Months Summary

Buy / Acquisition
134K Shares
From 15 Insiders
Grant, award, or other acquisition 17.4K shares
Exercise of conversion of derivative security 117K shares
Sell / Disposition
67.7K Shares
From 13 Insiders
Open market or private sale 19.6K shares
Payment of exercise price or tax liability 48.1K shares

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