John Tseng-Chung Lee $MKSI SEC Form 4 Insider Trading

John Tseng-Chung Lee has filed a total of 4 insider trades in $MKSI since 2021. Their most recent trade was a sale of 13,310 shares, made on Feb 20, 2026. Their largest trade was a sale of 13,310 shares, made on Feb 20, 2026. We estimate that they now own 184,696 shares of $MKSI, worth an estimated $21.1 million.

Insider Trading at $MKSI

There have been a total of 68 insider trades reported at $MKSI since 2021, with 3,750 shares purchased and 4.2 million shares sold. The most active insider traders in $MKSI stock have been Seth H Bagshaw, John Tseng-Chung Lee, and Kathleen Flaherty Burke. The most recent trade was a sale of 1,250 shares reported by PETER III CANNONE (None), made on Feb 20, 2026.

$MKSI Executives and Stock Owners with Insider Trades

• Seth H Bagshaw, EVP, CFO & Treasurer

• John Tseng-Chung Lee, President & CEO

• Kathleen Flaherty Burke, EVP, GC & Secretary

• David Philip Henry, EVP, Global Str Mktg & GM, MSD

• David Philip Henry, EVP, Operations & Corp Mktg

• James Alan Schreiner, EVP & COO

• John Edward Williams, EVP & GM, PSD

• Michelle M Mccarthy, VP & Chief Accounting Officer

• Eric Robert Taranto, EVP & GM, VSD

• James Alan Schreiner, EVP & COO, MSD

*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.