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Reporting owner

Lee John Tseng-Chung

Reporting owner CIK 0001414656 · President & CEO · Director

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These transactions appear in filings associated with this reporting owner. Jointly reported quantities and amounts are unallocated; they are not this owner's individual purchases or total holdings. Names and roles reflect the relevant filing, and a reporting owner may be a person or an organization.

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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.Lee John Tseng-ChungLee John Tseng-ChungLee John Tseng-Chung · October 31, 2025 · Exercise / conversion · Common StockLee John Tseng-Chung · October 31, 2025 · Exercise / conversion · Common StockOct 31, 2025Oct 31, 2025
PurchaseStock awardGift receivedExercise / conversionConversionOther acquisition

2 dated transactions · 1 of 1 reporting owners shown. Select one owner to focus the chart.

View timeline as a table
Transaction dateCompany / securityReporting ownersAcquisition type
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.

Transactions in associated filings

Reported insider acquisitions, ordered by filing date, newest first. Currency is shown only when reported.
Filed / transactedCompanyReporting ownersType / securityQuantityPrice / reference valueDetails
Trade: MKS INCMKSI · company listings
Lee John Tseng-ChungPresident & CEO · Director
Exercise / conversionCommon StockNon-derivative security · Code M1,651Not reported *Value: Not reportedCurrency not specifiedView ↗
Trade: MKS INCMKSI · company listings
Lee John Tseng-ChungPresident & CEO · Director
Exercise / conversionCommon StockNon-derivative security · Code M352Not reported *Value: Not reportedCurrency not specifiedView ↗