John Tseng-Chung Lee holds the role of Director at COGNEX CORP (CGNX). Lee's filing history also covers MKS INC (MKSI). Lee has reported 7 insider filings with the SEC since 2024. The most recent filing was in February 2026.
Every role John Tseng-Chung Lee has reported on a Form 4, reconstructed from the filings themselves. Reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
MKS INC (MKSI)1 filingUpdated Aug 30, 2026
John Tseng-Chung Lee is President & CEO, Director of MKS INC (MKSI). 8 SEC Form 4 filings on record going back to 2024, most recently on 17 August 2026. Most recent open-market trade: sold $3.02M of MKSI on 17 August 2026. Lifetime open-market sales: $10.72M.
Every recent SEC Form 4 transaction John Tseng-Chung Lee has reported, most recent first.
InsiderAlpha's records for John Tseng-Chung Lee go back to 2024: 8 primary Form 4 filings, an average of 2.7 per year. 1 recorded transaction carries a Rule 10b5-1 flag, meaning it was pre-scheduled under a written trading plan rather than discretionary.
Insiders who reported open-market trades in the last 12 months at the companies John Tseng-Chung Lee files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
John Tseng-Chung Lee is a corporate insider, tracked as President & CEO, Director of MKS INC (MKSI). InsiderAlpha holds 8 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
1 primary Form 4 filing in the last 90 days, covering 1 company.
Recorded transactions: 0 open-market purchases and 5 open-market sales ($10.72M) across all tracked filings.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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