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

5 trades

$30.07M

Net Position

Net Seller

$30.07M

Companies Traded

MKSI

Active Period

Feb 2026 – Aug 2026

5 total trades

Most Recent

Sell MKSI

Aug 17, 2026 · $3.02M

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

Buys

0 · $0.00

Sells

5 · $30.07M

Total Shares Bought

Total Shares Sold

112,548

MKSI Price Chart

Loading chart...

Date	Type	Shares	Avg Price	Value	Shares After
Aug 17, 2026	Sell	10,000	$302.01	$3.02M	134,776
May 26, 2026	Sell	10,000	$315.48	$3.15M	144,696
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