John Tseng-Chung Lee

MKSI

John Tseng-Chung Lee serves as director, officer: President & CEO at MKS Inc. (MKSI). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

0 trades

$0.00

Total Sells

3 trades

$23.89M

Net Position

Net Seller

$23.89M

Companies Traded

MKSI

Active Period

Feb 2026

3 total trades

Most Recent

Sell MKSI

Feb 23, 2026 · $7.70M

John Tseng-Chung Lee's Insider Trading at MKS Inc. (MKSI)

Buys

0 · $0.00

Sells

3 · $23.89M

Total Shares Bought

Total Shares Sold

92,548

MKSI Price Chart

Loading chart...

Date	Type	Shares	Avg Price	Value	Shares After
Feb 23, 2026	Sell	30,000	$256.77	$7.70M	171,386
Feb 20, 2026	Sell	30,000	$256.77	$7.70M	0
Feb 17, 2026	Sell	32,548	$260.74	$8.49M	0

Related Insiders

Jacqueline F Moloney

Director

MKSISell · Mar 13, 2026

Eric Robert Taranto

officer: EVP & GM, VSD

MKSISell · Mar 9, 2026

Elizabeth Mora

Director

MKSISell · Mar 3, 2026

James Alan Schreiner

officer: EVP & COO

MKSISell · Feb 25, 2026

COLELLA GERALD G

Director

MKSISell · Feb 24, 2026

John Edward Williams

officer: EVP & GM, PSD

MKSISell · Feb 23, 2026

CANNONE PETER III

Director

MKSISell · Feb 23, 2026

David Philip Henry

officer: EVP, Global Str Mktg & GM, MSD

MKSISell · Feb 23, 2026

Explore More Insider Trading Data

MKSI Insider Trading Activity

View all insider trades at MKS Inc.

Technology Sector Insider Trades

See insider activity across technology stocks

Latest Insider Buys

Most recent insider purchases across all stocks

CEO Stock Purchases

Track CEO buying activity