NASDAQ:MKSI

Mks Instruments Stock Insider Trading

Technology > Hardware, Equipment & Parts

Buy MKSI

*Your capital is at risk

$297.45

+4.15 (+1.41%)

At Close: Jul 31, 2026

MKS Instruments Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at -91.37. In total, the insiders bought 70.95M and sold 153.34M MKSI shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	-91.37
● Buy	70.95M shares
● Sell	153.34M shares
54% Buy Activity Strong Negative Correlation
Sell Signal High Confidence Feb 20, 2026 Analysis Breakdown: Strongly supported by a very low Insider Power Score of -91.37. Partially supported by a negative historical correlation. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Feb 20, 2026 Sell	Common Stock S-Sale	Lee John Tseng-chung President & CEO	CEO / President	1 988 Value: $512.5K
Feb 20, 2026 Sell	Common Stock S-Sale	Lee John Tseng-chung President & CEO	CEO / President	1 890 Value: $490.8K
Feb 20, 2026 Sell	Common Stock S-Sale	Burke Kathleen Flaherty EVP, GC & Secretary	Officer	4 254 Value: $1.06M
Feb 20, 2026 Sell	Common Stock S-Sale	Moloney Jacqueline F Director	Director	829 Value: $205.2K
Feb 20, 2026 Sell	Common Stock S-Sale	Williams John Edward EVP & Gm, Psd	Officer	2 043 Value: $523.7K
Feb 20, 2026 Sell	Common Stock S-Sale	Cannone Peter Iii Director	Director	1 250 Value: $322.6K
Feb 20, 2026 Sell	Common Stock S-Sale	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	2 000 Value: $523.1K
Feb 20, 2026 Sell	Common Stock S-Sale	Mccarthy Michelle M Vp & Chief Accounting Officer	Officer	650 Value: $162.2K
Feb 20, 2026 Sell	Common Stock S-Sale	Taranto Eric Robert EVP & Gm, Vsd	Officer	1 453 Value: $359.6K
Feb 20, 2026 Sell	Common Stock S-Sale	Mccarthy Michelle M Vp & Chief Accounting Officer	Officer	816 Value: $204.3K
Feb 20, 2026 Sell	Common Stock S-Sale	Lee John Tseng-chung President & CEO	CEO / President	12 812 Value: $3.29M
Feb 17, 2026 Buy	Restricted Stock Unit M-Exempt	Schreiner James Alan EVP & COO	C-Suite Officer	1 211 Value: $318.4K
Feb 17, 2026 Buy	Restricted Stock Unit M-Exempt	Schreiner James Alan EVP & COO	C-Suite Officer	432 Value: $113.7K
Feb 17, 2026 Buy	Restricted Stock Unit M-Exempt	Schreiner James Alan EVP & COO	C-Suite Officer	1 330 Value: $349.8K
Feb 17, 2026 Buy	Restricted Stock Unit M-Exempt	Schreiner James Alan EVP & COO	C-Suite Officer	2 567 Value: $674.9K
Feb 17, 2026 Buy	Common Stock M-Exempt	Schreiner James Alan EVP & COO	C-Suite Officer	1 944 Value: $511.2K
Feb 17, 2026 Buy	Restricted Stock Unit M-Exempt	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	2 054 Value: $540.1K
Feb 17, 2026 Buy	Restricted Stock Unit M-Exempt	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	1 841 Value: $484.0K
Feb 17, 2026 Buy	Restricted Stock Unit M-Exempt	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	2 406 Value: $632.5K
Feb 17, 2026 Buy	Common Stock M-Exempt	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	1 247 Value: $327.9K
Feb 17, 2026 Buy	Common Stock M-Exempt	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	456 Value: $120.0K
Feb 17, 2026 Sell	Common Stock F-InKind	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	4 097 Value: $1.07M
Feb 17, 2026 Buy	Common Stock M-Exempt	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	1 278 Value: $336.0K
Feb 17, 2026 Buy	Restricted Stock Unit A-Award	Henry David Philip EVP, Global Str Mktg & Gm, Msd	Officer	2 567 Value: $675.0K
Feb 17, 2026 Buy	Restricted Stock Unit M-Exempt	Taranto Eric Robert EVP & Gm, Vsd	Officer	1 764 Value: $463.9K

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT MKS INSTRUMENTS

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 measureme...

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