Skip to content
Whale Atlas — Follow the signal.
Home
FULL RECORDS
Search insider filingsAll Congress filings
MORE TOOLS
WatchlistGold IntelligencePeopleCharts & technicalsCompany financialsOfficial newsMy saved workspace
YOUR RESEARCH
HomeSearch insider filingsAll Congress filings
More research tools
ExploreGold IntelligencePeopleInvestigate an ideaCharts & technicalsMore evidenceCompany financialsOfficial newsMy research & helpWatchlistMy saved workspaceLearn the basicsHow signals workData & coverage
RESOURCES
LearnMethodologyData sources
Built on public evidence.

Primary sources. Clear reasoning.
No black boxes.

Our approach
Public research workspacev1.0

Loading data…Scanning SEC filings…Checking Congress reports…Following the signal…

HomeSearchCongressWatchlist
© 2026 Whale AtlasFree public-filing research. Not financial advice. By using this site you agree to the Terms of Use.
FAQCompare trackersMethodologyData & correctionsTermsPrivacy
Back to Home
M

MKSI

Nasdaq

MKS INC

Latest disclosureSeptember 2, 2026
Insider score Why 0?
0/ 100
Qualifying buys · 30d
$0

0 purchases · 26 sales

Price by TradingViewDelayed quote from TradingView, for viewing only. It does not power Whale Atlas scores or alerts. If the quote does not load, open the TradingView link.

Insider transactions 45

Limited filing history
All45Buying0Selling26Other19
Filters

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

45 trades · April 15, 2026 – September 1, 2026Incomplete history: this shows the filings imported so far, not every filing ever made. Dates are trade dates. Filters affect this table only.

Showing the first 6 of 45 trades on this page.

Sale disclosed

Elizabeth Mora

Director

Common Stock

Reported value
$75.29K
Reported price
$250.96 / share
Traded September 1, 2026Filed September 2, 2026SEC filing
Award disclosed

Renee Martel Donlan

EVP, GC & CCO

Restricted Stock Unit

Derivative security · not the ordinary share price.

Value context
Unavailable
Reported price
Price not reported
Traded August 17, 2026Filed August 18, 2026SEC filing
Sale disclosed

John Tseng-Chung Lee

President & CEO

Common Stock

Reported value
$3.02M
Reported price
$302.01 / share
Traded August 14, 2026Filed August 17, 2026SEC filing
Sale disclosed

John Edward Williams

EVP & GM, PSD

Common Stock

Reported value
$131.76K
Reported price
$288.31 / share
Traded August 3, 2026Filed August 4, 2026SEC filing
Sale disclosed

James Alan Schreiner

EVP & COO

Common Stock

Reported value
$853.79K
Reported price
$345.5239 / share
Traded June 12, 2026Filed June 16, 2026SEC filing
Sale disclosed

James Alan Schreiner

EVP & COO

Common Stock

Reported value
$281.28K
Reported price
$346.4058 / share
Traded June 12, 2026Filed June 16, 2026SEC filing
Sale disclosed

James Alan Schreiner

EVP & COO

Common Stock

Reported value
$75.3K
Reported price
$347.00 / share
Traded June 12, 2026Filed June 16, 2026SEC filing
Sale disclosed

James Alan Schreiner

EVP & COO

Common Stock

Reported value
$247.91K
Reported price
$317.42 / share
Traded June 10, 2026Filed June 11, 2026SEC filing
Sale disclosed

Michelle M. McCarthy

SVP & Chief Accounting Officer

Common Stock

Reported value
$767.27K
Reported price
$315.23 / share
Traded June 5, 2026Filed June 8, 2026SEC filing
Sale disclosed

David Philip Henry

EVP, Global Str Mktg & GM, MSD

Common Stock

Reported value
$1.89M
Reported price
$314.4305 / share
Traded June 1, 2026Filed June 2, 2026SEC filing
Sale disclosed

Elizabeth Mora

Director

Common Stock

Reported value
$95.41K
Reported price
$318.02 / share
Traded June 1, 2026Filed June 2, 2026SEC filing
Sale disclosed

Joseph B. Donahue

Director

Common Stock

Reported value
$688.7K
Reported price
$327.954 / share
Traded May 27, 2026Filed May 28, 2026SEC filing
Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value
$153.3K
Reported price
$330.3828 / share
Traded May 27, 2026Filed May 28, 2026SEC filing
Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value
$2.72M
Reported price
$331.4488 / share
Traded May 27, 2026Filed May 28, 2026SEC filing
Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value
$1.62M
Reported price
$332.0414 / share
Traded May 27, 2026Filed May 28, 2026SEC filing
Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value
$607.51K
Reported price
$335.458 / share
Traded May 27, 2026Filed May 28, 2026SEC filing
Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value
$547.22K
Reported price
$336.5429 / share
Traded May 27, 2026Filed May 28, 2026SEC filing
Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value
$71.79K
Reported price
$337.0505 / share
Traded May 27, 2026Filed May 28, 2026SEC filing
Sale disclosed

Gerald G. Colella

Director

Common Stock

Reported value
$948.02K
Reported price
$338.58 / share
Traded May 27, 2026Filed May 28, 2026SEC filing
Sale disclosed

David Philip Henry

EVP, Global Str Mktg & GM, MSD

Common Stock

Reported value
$826.25K
Reported price
$330.50 / share
Traded May 26, 2026Filed May 27, 2026SEC filing
Sale disclosed

Ramakumar Mayampurath

EVP & CFO

Common Stock

Reported value
$2.78M
Reported price
$315.48 / share
Traded May 22, 2026Filed May 26, 2026SEC filing
Sale disclosed

John Tseng-Chung Lee

President & CEO

Common Stock

Reported value
$3.15M
Reported price
$315.48 / share
Traded May 22, 2026Filed May 26, 2026SEC filing
Sale disclosed

Peter Cannone III

Director

Common Stock

Reported value
$409.59K
Reported price
$303.4001 / share
Traded May 18, 2026Filed May 19, 2026SEC filing
Sale disclosed

Jacqueline F. Moloney

Director

Common Stock

Reported value
$312.2K
Reported price
$312.1969 / share
Traded May 14, 2026Filed May 15, 2026SEC filing
Sale disclosed

Jacqueline F. Moloney

Director

Common Stock

Reported value
$446.59K
Reported price
$318.99 / share
Traded May 13, 2026Filed May 14, 2026SEC filing
Sale disclosed

Eric Robert Taranto

EVP & GM, VSD

Common Stock

Reported value
$911.33K
Reported price
$319.93 / share
Traded May 11, 2026Filed May 12, 2026SEC filing
Award disclosed

Jacqueline F. Moloney

Director

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded May 11, 2026Filed May 12, 2026SEC filing
Award disclosed

Wissam G. Jabre

Director

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded May 11, 2026Filed May 12, 2026SEC filing
Award disclosed

Elizabeth Mora

Director

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded May 11, 2026Filed May 12, 2026SEC filing
Sale disclosed

Kathleen Flaherty Burke

EVP, GC & Secretary

Common Stock

Reported value
$1.39M
Reported price
$319.935 / share
Traded May 11, 2026Filed May 12, 2026SEC filing
Award disclosed

Joseph B. Donahue

Director

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded May 11, 2026Filed May 12, 2026SEC filing
Award disclosed

Peter Cannone III

Director

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded May 11, 2026Filed May 12, 2026SEC filing
Award disclosed

Raj Batra

Director

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded May 11, 2026Filed May 12, 2026SEC filing
Award disclosed

Gerald G. Colella

Director

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded May 11, 2026Filed May 12, 2026SEC filing
Exercise or conversion

John Edward Williams

EVP & GM, PSD

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded April 17, 2026Filed April 20, 2026SEC filing
Tax or exercise withholding

John Edward Williams

EVP & GM, PSD

Common Stock

Value context
$222.92K
Reported price
$269.89 / share
Traded April 17, 2026Filed April 20, 2026SEC filing
Exercise or conversion

John Edward Williams

EVP & GM, PSD

Restricted Stock Unit

Derivative security · not the ordinary share price.

Value context
Not a separate purchase
Exercise / conversion price
Exercise / conversion price not reported
Understand this price

This row records an option exercise or conversion. The derivative transaction price is separate from the exercise price; it is not the stock's market price. Its row value is not shown as another stock purchase.

Traded April 17, 2026Filed April 20, 2026SEC filing
Exercise or conversion

Michelle M. McCarthy

SVP & Chief Accounting Officer

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded April 15, 2026Filed April 16, 2026SEC filing
Exercise or conversion

Michelle M. McCarthy

SVP & Chief Accounting Officer

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded April 15, 2026Filed April 16, 2026SEC filing
Exercise or conversion

Michelle M. McCarthy

SVP & Chief Accounting Officer

Common Stock

Value context
Unavailable
Reported price
Price not reported
Traded April 15, 2026Filed April 16, 2026SEC filing
Tax or exercise withholding

Michelle M. McCarthy

SVP & Chief Accounting Officer

Common Stock

Value context
$377.08K
Reported price
$274.15 / share
Traded April 15, 2026Filed April 16, 2026SEC filing
Award disclosed

Michelle M. McCarthy

SVP & Chief Accounting Officer

Restricted Stock Unit

Derivative security · not the ordinary share price.

Value context
Unavailable
Reported price
Price not reported
Traded April 15, 2026Filed April 16, 2026SEC filing
Exercise or conversion

Michelle M. McCarthy

SVP & Chief Accounting Officer

Restricted Stock Unit

Derivative security · not the ordinary share price.

Value context
Not a separate purchase
Exercise / conversion price
Exercise / conversion price not reported
Understand this price

This row records an option exercise or conversion. The derivative transaction price is separate from the exercise price; it is not the stock's market price. Its row value is not shown as another stock purchase.

Traded April 15, 2026Filed April 16, 2026SEC filing
Exercise or conversion

Michelle M. McCarthy

SVP & Chief Accounting Officer

Restricted Stock Unit

Derivative security · not the ordinary share price.

Value context
Not a separate purchase
Exercise / conversion price
Exercise / conversion price not reported
Understand this price

This row records an option exercise or conversion. The derivative transaction price is separate from the exercise price; it is not the stock's market price. Its row value is not shown as another stock purchase.

Traded April 15, 2026Filed April 16, 2026SEC filing
Exercise or conversion

Michelle M. McCarthy

SVP & Chief Accounting Officer

Restricted Stock Unit

Derivative security · not the ordinary share price.

Value context
Not a separate purchase
Exercise / conversion price
Exercise / conversion price not reported
Understand this price

This row records an option exercise or conversion. The derivative transaction price is separate from the exercise price; it is not the stock's market price. Its row value is not shown as another stock purchase.

Traded April 15, 2026Filed April 16, 2026SEC filing
Reporting insiderSecurity / transactionAmount / priceValueTraded / disclosedSource
DirectorCommon StockSale10b5-1300$250.96 / share$75.29KSep 1Filed Sep 2 · 1d laterSEC filing
EVP, GC & CCORestricted Stock UnitGrant or awardDerivative units954Price not reportedUnavailableAug 17Filed Aug 18 · 1d laterSEC filing
President & CEOCommon StockSale10b5-110,000$302.01 / share$3.02MAug 14Filed Aug 17 · 3d laterSEC filing
EVP & GM, PSDCommon StockSale10b5-1457$288.31 / share$131.76KAug 3Filed Aug 4 · 1d laterSEC filing
EVP & COOCommon StockSale3 trades3,500avg $345.82 / share$1.21MJun 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 & COOCommon StockSale10b5-1781$317.42 / share$247.91KJun 10Filed Jun 11 · 1d laterSEC filing
SVP & Chief Accounting OfficerCommon StockSale10b5-12,434$315.23 / share$767.27KJun 5Filed Jun 8 · 3d laterSEC filing
EVP, Global Str Mktg & GM, MSDCommon StockSale6,000$314.43 / share$1.89MJun 1Filed Jun 2 · 1d laterSEC filing
DirectorCommon StockSale10b5-1300$318.02 / share$95.41KJun 1Filed Jun 2 · 1d laterSEC filing
DirectorCommon StockSale2,100$327.95 / share$688.7KMay 27Filed May 28 · 1d laterSEC filing
DirectorCommon StockSale10b5-17 trades20,000avg $333.40 / share$6.67MMay 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, MSDCommon StockSale10b5-12,500$330.50 / share$826.25KMay 26Filed May 27 · 1d laterSEC filing
EVP & CFOCommon StockSale10b5-18,810$315.48 / share$2.78MMay 22Filed May 26 · 4d laterSEC filing
President & CEOCommon StockSale10b5-110,000$315.48 / share$3.15MMay 22Filed May 26 · 4d laterSEC filing
DirectorCommon StockSale1,350$303.40 / share$409.59KMay 18Filed May 19 · 1d laterSEC filing
DirectorCommon StockSale1,000$312.20 / share$312.2KMay 14Filed May 15 · 1d laterSEC filing
DirectorCommon StockSale1,400$318.99 / share$446.59KMay 13Filed May 14 · 1d laterSEC filing
EVP & GM, VSDCommon StockSale2,849$319.93 / share$911.33KMay 11Filed May 12 · 1d laterSEC filing
DirectorCommon StockGrant or award782Price not reportedUnavailableMay 11Filed May 12 · 1d laterSEC filing
DirectorCommon StockGrant or award782Price not reportedUnavailableMay 11Filed May 12 · 1d laterSEC filing
DirectorCommon StockGrant or award782Price not reportedUnavailableMay 11Filed May 12 · 1d laterSEC filing
EVP, GC & SecretaryCommon StockSale4,355$319.94 / share$1.39MMay 11Filed May 12 · 1d laterSEC filing
DirectorCommon StockGrant or award782Price not reportedUnavailableMay 11Filed May 12 · 1d laterSEC filing
DirectorCommon StockGrant or award782Price not reportedUnavailableMay 11Filed May 12 · 1d laterSEC filing
DirectorCommon StockGrant or award782Price not reportedUnavailableMay 11Filed May 12 · 1d laterSEC filing
DirectorCommon StockGrant or award782Price not reportedUnavailableMay 11Filed May 12 · 1d laterSEC filing
EVP & GM, PSDCommon StockOption exercise or conversion1,741Price not reportedUnavailableApr 17Filed Apr 20 · 3d laterSEC filing
EVP & GM, PSDCommon StockExercise-price or tax withholding826$269.89 / share$222.92KApr 17Filed Apr 20 · 3d laterSEC filing
EVP & GM, PSDRestricted Stock UnitOption exercise or conversionDerivative units1,741Exercise / conversion price not reportedNot a separate purchaseApr 17Filed Apr 20 · 3d laterSEC filing
SVP & Chief Accounting OfficerCommon StockOption exercise or conversion968Price not reportedUnavailableApr 15Filed Apr 16 · 1d laterSEC filing
SVP & Chief Accounting OfficerCommon StockOption exercise or conversion1,107Price not reportedUnavailableApr 15Filed Apr 16 · 1d laterSEC filing
SVP & Chief Accounting OfficerCommon StockOption exercise or conversion1,736Price not reportedUnavailableApr 15Filed Apr 16 · 1d laterSEC filing
SVP & Chief Accounting OfficerCommon StockExercise-price or tax withholding1,375$274.15 / share$377.08KApr 15Filed Apr 16 · 1d laterSEC filing
SVP & Chief Accounting OfficerRestricted Stock UnitGrant or awardDerivative units1,673Price not reportedUnavailableApr 15Filed Apr 16 · 1d laterSEC filing
SVP & Chief Accounting OfficerRestricted Stock UnitOption exercise or conversionDerivative units968Exercise / conversion price not reportedNot a separate purchaseApr 15Filed Apr 16 · 1d laterSEC filing
SVP & Chief Accounting OfficerRestricted Stock UnitOption exercise or conversionDerivative units1,107Exercise / conversion price not reportedNot a separate purchaseApr 15Filed Apr 16 · 1d laterSEC filing
SVP & Chief Accounting OfficerRestricted Stock UnitOption exercise or conversionDerivative units1,736Exercise / conversion price not reportedNot a separate purchaseApr 15Filed Apr 16 · 1d laterSEC filing

Congress transactions 3

All Congress filings
Sale disclosed

MKS Inc. - Common Stock (MKSI) · Stock

The filing reports a sale for a spouse.

Lisa McClain official portraitLisa McClainReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
October 31, 2025
Filed November 21, 2025 · 21d laterOriginal report
Sale disclosed

MKS Inc. - Common Stock (MKSI) · Stock

The filing reports a sale for a spouse.

Lisa McClain official portraitLisa McClainReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
October 30, 2025
Filed November 21, 2025 · 22d laterOriginal report
Purchase disclosed

MKS Inc. - Common Stock (MKSI) · Stock

The filing reports a purchase for a spouse.

Lisa McClain official portraitLisa McClainReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
October 30, 2025
Filed November 21, 2025 · 22d laterOriginal report
Explore furtherTechnical lab Company financials Test a strategy Compare company

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.