The Market LogEnter at least 2 characters. Company and ticker searches are not case-sensitive.

Company profile

MKS INC insider acquisitions

Company CIK 0001049502 · Reported insider acquisitions and filing context.

Company filings at SEC ↗
MKSI · Nasdaq

These are company listings. A transaction is linked to a particular security only when the filing provides enough information.

Company activity summary

By transaction date, as of October 23, 2026.

7 days30 days90 daysOverlapping periods · securities and currencies kept separate

No records are loaded for this 30-day transaction window. This does not establish that no transactions occurred.

Known purchase value sums available amounts for non-derivative purchases only. Missing amounts are excluded. “Currency not specified” does not establish that the amounts share a currency. These summaries use all matching loaded records, while the timeline below covers only the current page.

Transaction timeline

Who reported an acquisition, and when the transaction occurred.

Reported acquisitions by transaction dateEach row is a reporting owner. Select a marker to open its transaction details. Jointly reported transactions appear for each associated reporting owner, without dividing quantities or amounts.Mayampurath RamakumarMayampurath RamakumarBurke Kathleen FlahertyBurke Kathleen FlahertyLee John Tseng-ChungLee John Tseng-ChungMayampurath Ramakumar · November 17, 2025 · Exercise / conversion · Common StockBurke Kathleen Flaherty · October 31, 2025 · Exercise / conversion · Common StockBurke Kathleen Flaherty · October 31, 2025 · Exercise / conversion · Common StockBurke Kathleen Flaherty · October 31, 2025 · Exercise / conversion · Common StockBurke Kathleen Flaherty · October 31, 2025 · Exercise / conversion · Common StockBurke Kathleen Flaherty · October 31, 2025 · Exercise / conversion · Common StockLee John Tseng-Chung · October 31, 2025 · Exercise / conversion · Common StockLee John Tseng-Chung · October 31, 2025 · Exercise / conversion · Common StockOct 31, 2025Nov 17, 2025
PurchaseStock awardGift receivedExercise / conversionConversionOther acquisition

8 dated transactions · 3 of 3 reporting owners shown. Select one owner to focus the chart.

View timeline as a table
Transaction dateCompany / securityReporting ownersAcquisition type
Nov 17, 2025MKS INCCommon StockMayampurath RamakumarExercise / conversion
Oct 31, 2025MKS INCCommon StockBurke Kathleen FlahertyExercise / conversion
Oct 31, 2025MKS INCCommon StockBurke Kathleen FlahertyExercise / conversion
Oct 31, 2025MKS INCCommon StockBurke Kathleen FlahertyExercise / conversion
Oct 31, 2025MKS INCCommon StockBurke Kathleen FlahertyExercise / conversion
Oct 31, 2025MKS INCCommon StockBurke Kathleen FlahertyExercise / conversion
Oct 31, 2025MKS INCCommon StockLee John Tseng-ChungExercise / conversion
Oct 31, 2025MKS INCCommon StockLee John Tseng-ChungExercise / conversion

Only transactions on this page are shown. Date windows end on the latest transaction date in this sample. Joint filings may appear on more than one row. Sales are not included. Share-price charts use a separate data source.

Share price & reported acquisitions

Daily closing prices from a separate source. The date window above also filters prices; reporting-owner and transaction-type selections filter the markers.

Price history is not available

Market-price history is not connected yet.

MKSI · Currency not specified. A marker uses that day's closing price, not the reported transaction price. No price is substituted for a missing trading day.

Reported acquisitions

Filing-date filters apply to the list and timeline. The summary above uses transaction dates.

Reset
Reported insider acquisitions, ordered by filing date, newest first. Currency is shown only when reported.
Filed / transactedReporting ownersType / securityQuantityPrice / reference valueDetails
Trade: Exercise / conversionCommon StockNon-derivative security · Code M8,295Not reported *Value: Not reportedCurrency not specifiedView ↗
Trade:
Burke Kathleen FlahertyEVP, GC & Secretary
Exercise / conversionCommon StockNon-derivative security · Code M341Not reported *Value: Not reportedCurrency not specifiedView ↗
Trade:
Burke Kathleen FlahertyEVP, GC & Secretary
Exercise / conversionCommon StockNon-derivative security · Code M144Not reported *Value: Not reportedCurrency not specifiedView ↗
Trade:
Burke Kathleen FlahertyEVP, GC & Secretary
Exercise / conversionCommon StockNon-derivative security · Code M82Not reported *Value: Not reportedCurrency not specifiedView ↗
Trade:
Burke Kathleen FlahertyEVP, GC & Secretary
Exercise / conversionCommon StockNon-derivative security · Code M52Not reported *Value: Not reportedCurrency not specifiedView ↗
Trade:
Burke Kathleen FlahertyEVP, GC & Secretary
Exercise / conversionCommon StockNon-derivative security · Code M158Not reported *Value: Not reportedCurrency not specifiedView ↗
Trade:
Lee John Tseng-ChungPresident & CEO · Director
Exercise / conversionCommon StockNon-derivative security · Code M1,651Not reported *Value: Not reportedCurrency not specifiedView ↗
Trade:
Lee John Tseng-ChungPresident & CEO · Director
Exercise / conversionCommon StockNon-derivative security · Code M352Not reported *Value: Not reportedCurrency not specifiedView ↗

Reporting owners are associated with a filing. Jointly reported amounts are not allocated to individual owners. Historical coverage is still being built. Read the methodology →