John Tseng-Chung Lee Net Worth
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John Tseng-Chung Lee has an estimated net worth of at least $59.4 million*, as of June 3, 2026. They own 144,696 shares of MKSI stock. They have sold 40,000 shares of MKSI stock since 2021, for an estimated $10.9 million.
John Tseng-Chung Lee $MKSI SEC Form 4 Insider Trading
John Tseng-Chung Lee has filed a total of 5 insider trades in $MKSI since 2021. Their most recent trade was a sale of 10,000 shares, made on May 22, 2026. Their largest trade was a sale of 13,310 shares, made on Feb 20, 2026. We estimate that they now own 144,696 shares of $MKSI, worth an estimated $48.5 million.
Insider Trading at $MKSI
There have been a total of 91 insider trades reported at $MKSI since 2021, with 3,750 shares purchased and 4.3 million shares sold. The most active insider traders in $MKSI stock have been John Tseng-Chung Lee, Seth H Bagshaw, and David Philip Henry. The most recent trade was a sale of 2,434 shares reported by Michelle M McCarthy (SVP & Chief Accounting Officer), made on Jun 05, 2026.
History of Insider Stock Trades by John Tseng-Chung Lee
| Company Ticker | Purchase / Sale | Shares | Date | Disclosed (EST) |
|---|---|---|---|---|
MKSI
|
Sale | 10,000 | May 22, 2026 | May 26, 2026, 2:15 p.m. |
|
MKSI
|
Sale | 13,310 | Feb 20, 2026 | Feb. 23, 2026, 3:25 p.m. |
|
MKSI
|
Sale | 12,812 | Feb 20, 2026 | Feb. 23, 2026, 3:25 p.m. |
|
MKSI
|
Sale | 1,988 | Feb 20, 2026 | Feb. 23, 2026, 3:25 p.m. |
|
MKSI
|
Sale | 1,890 | Feb 20, 2026 | Feb. 23, 2026, 3:25 p.m. |
$MKSI Executives and Stock Owners with Insider Trades
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John Tseng-Chung Lee, President & CEO
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Seth H Bagshaw, EVP, CFO & Treasurer
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David Philip Henry, EVP, Global Str Mktg & GM, MSD
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Kathleen Flaherty Burke, EVP, GC & Secretary
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James Alan Schreiner, EVP & COO
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David Philip Henry, EVP, Operations & Corp Mktg
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Eric Robert Taranto, EVP & GM, VSD
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John Edward Williams, EVP & GM, PSD
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Michelle M Mccarthy, VP & Chief Accounting Officer
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James Alan Schreiner, EVP & COO, MSD
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Michelle M Mccarthy, SVP & Chief Accounting Officer
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Ramakumar Mayampurath, EVP & CFO
*This is only based off of information found in SEC filings, and may not reflect actual net worth. There may also be inaccuracies due to privately holdings filing errors, parsing errors, accidental double-counting of shares, incorrect classification of indirectly owned shares, sales prior to dataset start date, or any other number of issues.