MKSI

Nasdaq

MKS INC

Latest disclosureSeptember 2, 2026

Insider score Why 0?: 0/ 100
Qualifying buys · 30d: $0

0 purchases · 26 sales

Price by TradingView

Insider transactions 45

Limited filing history

Filters

Last 30 daysNo qualifying insider buying. No qualifying insider sales.

Showing the first 6 of 20 trades on this page.

Sale disclosed

Elizabeth Mora

Director

Common Stock

Reported value: $75.29K
Reported price: $250.96 / share

Sale disclosed

John Tseng-Chung Lee

President & CEO

Common Stock

Reported value: $3.02M
Reported price: $302.01 / share

Sale disclosed

John Edward Williams

EVP & GM, PSD

Common Stock

Reported value: $131.76K
Reported price: $288.31 / share

Sale disclosed

James Alan Schreiner

EVP & COO

Common Stock

Reported value: $853.79K
Reported price: $345.5239 / share

Sale disclosed

James Alan Schreiner

EVP & COO

Common Stock

Reported value: $281.28K
Reported price: $346.4058 / share

Sale disclosed

James Alan Schreiner

EVP & COO

Common Stock

Reported value: $75.3K
Reported price: $347.00 / share

Sale disclosed

James Alan Schreiner

EVP & COO

Common Stock

Reported value: $247.91K
Reported price: $317.42 / share

Sale disclosed

Michelle M. McCarthy

SVP & Chief Accounting Officer

Common Stock

Reported value: $767.27K
Reported price: $315.23 / share

Sale disclosed

David Philip Henry

EVP, Global Str Mktg & GM, MSD

Common Stock

Reported value: $1.89M
Reported price: $314.4305 / share

Sale disclosed

Elizabeth Mora

Director

Common Stock

Reported value: $95.41K
Reported price: $318.02 / share

Sale disclosed

Joseph B. Donahue

Director

Common Stock

Reported value: $688.7K
Reported price: $327.954 / share

Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value: $153.3K
Reported price: $330.3828 / share

Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value: $2.72M
Reported price: $331.4488 / share

Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value: $1.62M
Reported price: $332.0414 / share

Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value: $607.51K
Reported price: $335.458 / share

Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value: $547.22K
Reported price: $336.5429 / share

Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value: $71.79K
Reported price: $337.0505 / share

Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value: $948.02K
Reported price: $338.58 / share

Sale disclosed

David Philip Henry

EVP, Global Str Mktg & GM, MSD

Common Stock

Reported value: $826.25K
Reported price: $330.50 / share

Sale disclosed

Ramakumar Mayampurath

EVP & CFO

Common Stock

Reported value: $2.78M
Reported price: $315.48 / share

Reporting insider	Security / transaction	Amount / price	Value	Traded / disclosed	Source
Director	Common StockSale10b5-1	300$250.96 / share	$75.29K	Sep 1Filed Sep 2 · 1d later	SEC filing
President & CEO	Common StockSale10b5-1	10,000$302.01 / share	$3.02M	Aug 14Filed Aug 17 · 3d later	SEC filing
EVP & GM, PSD	Common StockSale10b5-1	457$288.31 / share	$131.76K	Aug 3Filed Aug 4 · 1d later	SEC filing
EVP & COO	Common StockSale3 trades	3,500avg $345.82 / share	$1.21M	Jun 12Filed Jun 16 · 4d later	3 filings 2,471 @ $345.52 · $853.79KSEC filing 812 @ $346.41 · $281.28KSEC filing 217 @ $347.00 · $75.3KSEC filing
EVP & COO	Common StockSale10b5-1	781$317.42 / share	$247.91K	Jun 10Filed Jun 11 · 1d later	SEC filing
SVP & Chief Accounting Officer	Common StockSale10b5-1	2,434$315.23 / share	$767.27K	Jun 5Filed Jun 8 · 3d later	SEC filing
EVP, Global Str Mktg & GM, MSD	Common StockSale	6,000$314.43 / share	$1.89M	Jun 1Filed Jun 2 · 1d later	SEC filing
Director	Common StockSale10b5-1	300$318.02 / share	$95.41K	Jun 1Filed Jun 2 · 1d later	SEC filing
Director	Common StockSale	2,100$327.95 / share	$688.7K	May 27Filed May 28 · 1d later	SEC filing
Director	Common StockSale10b5-17 trades	20,000avg $333.40 / share	$6.67M	May 27Filed May 28 · 1d later	7 filings 464 @ $330.38 · $153.3KSEC filing 8,210 @ $331.45 · $2.72MSEC filing 4,876 @ $332.04 · $1.62MSEC filing 1,811 @ $335.46 · $607.51KSEC filing 1,626 @ $336.54 · $547.22KSEC filing 213 @ $337.05 · $71.79KSEC filing 2,800 @ $338.58 · $948.02KSEC filing
EVP, Global Str Mktg & GM, MSD	Common StockSale10b5-1	2,500$330.50 / share	$826.25K	May 26Filed May 27 · 1d later	SEC filing
EVP & CFO	Common StockSale10b5-1	8,810$315.48 / share	$2.78M	May 22Filed May 26 · 4d later	SEC filing

Showing the latest 20 of 26 trades. Show all 26 trades

Congress transactions 3

All Congress filings

Sale disclosed

MKS Inc. - Common Stock (MKSI) · Stock

The filing reports a sale for a spouse.

Lisa McClainReporting House member

Reported amount: $1,001 – $15,000Reported range; exact amount not disclosed.
Trade date: October 31, 2025

Sale disclosed

MKS Inc. - Common Stock (MKSI) · Stock

The filing reports a sale for a spouse.

Lisa McClainReporting House member

Reported amount: $1,001 – $15,000Reported range; exact amount not disclosed.
Trade date: October 30, 2025

Purchase disclosed

MKS Inc. - Common Stock (MKSI) · Stock

The filing reports a purchase for a spouse.

Lisa McClainReporting House member

Reported amount: $1,001 – $15,000Reported range; exact amount not disclosed.
Trade date: October 30, 2025

Why this buying score?

No qualifying common-equity purchases

No eligible common-equity purchase is public by this cutoff within 180 transaction-date days. Other instruments, exercises and routine activity do not contribute purchase points.

+0 pts

This score describes qualifying insider purchases at issuer level. Read the methodology

Sources and coverage

Limited filing history · Market-wide discovery does not establish complete company history. View coverage

Source: SEC EDGAR · Form 4
Issuer CIK: 0001049502
Latest public acceptance: Sep 2, 2026, 04:34 PM UTC
Score calculated: Oct 8, 2026, 12:05 AM UTC
Parser: form4-parser-1.5
Classifier: form4-classifier-1.1
Scoring methodology: insider-experimental-1.1
Availability: Public filing time, not trade date

Open a transaction's SEC filing for the primary evidence. A code P may describe an open-market or private purchase; classification is not proof of intent.

Insider activity can have many explanations. Signal Strength is not a probability of profit or a recommendation to trade.

Reporting insider

Security / transaction

Amount / price

Value

Traded / disclosed

Source

Director

Common StockSale10b5-1

300$250.96 / share

$75.29K

Sep 1Filed Sep 2 · 1d later

SEC filing

President & CEO

Common StockSale10b5-1

10,000$302.01 / share

$3.02M

Aug 14Filed Aug 17 · 3d later

SEC filing

EVP & GM, PSD

Common StockSale10b5-1

457$288.31 / share

$131.76K

Aug 3Filed Aug 4 · 1d later

SEC filing

EVP & COO

Common StockSale3 trades

3,500avg $345.82 / share

$1.21M

Jun 12Filed Jun 16 · 4d later

3 filings

2,471 @ $345.52 · $853.79KSEC filing
812 @ $346.41 · $281.28KSEC filing
217 @ $347.00 · $75.3KSEC filing

EVP & COO

Common StockSale10b5-1

781$317.42 / share

$247.91K

Jun 10Filed Jun 11 · 1d later

SEC filing

SVP & Chief Accounting Officer

Common StockSale10b5-1

2,434$315.23 / share

$767.27K

Jun 5Filed Jun 8 · 3d later

SEC filing

EVP, Global Str Mktg & GM, MSD

Common StockSale

6,000$314.43 / share

$1.89M

Jun 1Filed Jun 2 · 1d later

SEC filing

Director

Common StockSale10b5-1

300$318.02 / share

$95.41K

Jun 1Filed Jun 2 · 1d later

SEC filing

Director

Common StockSale

2,100$327.95 / share

$688.7K

May 27Filed May 28 · 1d later

SEC filing

Director

Common StockSale10b5-17 trades

20,000avg $333.40 / share

$6.67M

May 27Filed May 28 · 1d later

7 filings

464 @ $330.38 · $153.3KSEC filing
8,210 @ $331.45 · $2.72MSEC filing
4,876 @ $332.04 · $1.62MSEC filing
1,811 @ $335.46 · $607.51KSEC filing
1,626 @ $336.54 · $547.22KSEC filing
213 @ $337.05 · $71.79KSEC filing
2,800 @ $338.58 · $948.02KSEC filing

EVP, Global Str Mktg & GM, MSD

Common StockSale10b5-1

2,500$330.50 / share

$826.25K

May 26Filed May 27 · 1d later

SEC filing

EVP & CFO

Common StockSale10b5-1

8,810$315.48 / share

$2.78M

May 22Filed May 26 · 4d later

SEC filing

Why this buying score?

No qualifying common-equity purchases

No eligible common-equity purchase is public by this cutoff within 180 transaction-date days. Other instruments, exercises and routine activity do not contribute purchase points.

+0 pts

This score describes qualifying insider purchases at issuer level. Read the methodology

Sources and coverage

Limited filing history · Market-wide discovery does not establish complete company history. View coverage

Source: SEC EDGAR · Form 4
Issuer CIK: 0001049502
Latest public acceptance: Sep 2, 2026, 04:34 PM UTC
Score calculated: Oct 8, 2026, 12:05 AM UTC
Parser: form4-parser-1.5
Classifier: form4-classifier-1.1
Scoring methodology: insider-experimental-1.1
Availability: Public filing time, not trade date

Open a transaction's SEC filing for the primary evidence. A code P may describe an open-market or private purchase; classification is not proof of intent.