Lee John Tseng-Chung
President & CEO
Lee John Tseng-Chung has filed 7 SEC Form 4 filings (18 transaction rows) across 2 companies, including MKSI, CGNX, with disclosures dating back to 2025. 7 of those filings fall inside the rolling window. Most recent filing: Aug 17, 2026.
On the most recent filing, Lee John Tseng-Chung is listed as President & CEO at MKS INC. Inside the rolling window, Lee John Tseng-Chung reported no open-market purchases and 3 open-market sales totaling $13.9M in MKSI. The largest disclosed transaction in the window is a sale of 30,000 MKSI shares on Feb 20, 2026, worth $7.7M.
Companies traded
Other insiders at MKSI
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$13.9M
reported sales (SEC code S)
Companies
2
in the rolling window
Frequently asked questions
How many SEC Form 4 filings has Lee John Tseng-Chung made?
Lee John Tseng-Chung has filed 7 SEC Form 4 filings (18 transaction rows) across 2 companies, including MKSI, CGNX since 2025.
Which companies does Lee John Tseng-Chung trade?
Lee John Tseng-Chung has filed SEC Form 4 disclosures for 2 companies, including MKSI, CGNX.
When was Lee John Tseng-Chung's most recent SEC Form 4 filing?
Lee John Tseng-Chung's most recent SEC Form 4 filing on Tracefour is dated Aug 17, 2026.
What is Lee John Tseng-Chung's job title?
On the most recent SEC Form 4 filings tracked by Tracefour, Lee John Tseng-Chung is listed as President & CEO.
What is Lee John Tseng-Chung's total buy and sell value in the current window?
Inside the rolling retention window, Lee John Tseng-Chung bought $0 and sold $13.9M based on SEC Form 4 filings.
What was Lee John Tseng-Chung's largest disclosed transaction?
The largest disclosed transaction in the current window is a sale of 30,000 MKSI shares on 2026-02-20, worth $7.7M, per SEC Form 4 filings.