13F Pro

SEC Form 4 reporting owner

Lee John Tseng-Chung

Lee John Tseng-Chung has filed 18 Form 4 transactions reported between February 8, 2026 and August 14, 2026, as President & CEO of MKS INC and Director of COGNEX CORP.

Name as filed: Lee John Tseng-Chung

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$13.9M
6 lines
Companies
2
with Form 4 filings
Latest transaction
Aug 14, 2026
transaction date

Roles and reported holdings

  • MKSIMKS INC
    Feb 8, 2026 – Aug 14, 2026

    President & CEO

    Held directly134,776 sh as of Aug 14, 2026 · Form 4

    24 months: $13.9M sold

  • CGNXCOGNEX CORP
    Feb 17, 2026 – Feb 21, 2026

    Director

    No common-stock holding reported on a purchase, sale, gift or withholding line.

Transaction history

All 18 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Aug 14, 2026MKSIPresident & CEOOpen-market saleCode S · direct10,000$3.0M@ $302.01Form 4
May 22, 2026MKSIPresident & CEOOpen-market saleCode S · direct10,000$3.2M@ $315.48Form 4
Feb 21, 2026CGNXDirectorOption exerciseCode M · direct2,913—Form 4
Feb 20, 2026MKSIPresident & CEOOpen-market saleCode S · direct1,890$491K@ $259.70Form 4
Feb 20, 2026MKSIPresident & CEOOpen-market saleCode S · direct1,988$513K@ $257.81Form 4
Feb 20, 2026MKSIPresident & CEOOpen-market saleCode S · direct12,812$3.3M@ $256.93Form 4
Feb 20, 2026MKSIPresident & CEOOpen-market saleCode S · direct13,310$3.4M@ $256.05Form 4
Feb 18, 2026CGNXDirectorOption exerciseCode M · direct8,324—Form 4
Feb 17, 2026MKSIPresident & CEOGrant or awardCode A · direct15,593—Form 4
Feb 17, 2026MKSIPresident & CEOShares withheld for tax or exercise priceCode F · direct32,548$8.5M@ $260.74Form 4
Feb 17, 2026MKSIPresident & CEOOption exerciseCode M · direct12,091—Form 4
Feb 17, 2026MKSIPresident & CEOOption exerciseCode M · direct16,989—Form 4
Feb 17, 2026MKSIPresident & CEOOption exerciseCode M · direct7,208—Form 4
Feb 17, 2026MKSIPresident & CEOOption exerciseCode M · direct3,859—Form 4
Feb 17, 2026MKSIPresident & CEOOption exerciseCode M · direct7,654—Form 4
Feb 17, 2026MKSIPresident & CEOOption exerciseCode M · direct22,088—Form 4
Feb 17, 2026CGNXDirectorGrant or awardCode A · direct4,817—Form 4
Feb 8, 2026MKSIPresident & CEOGrant or awardCode A · direct50,972—Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.