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

4 trades

$27.05M

Net Position

Net Seller

$27.05M

Companies Traded

MKSI

Active Period

Feb 2026 – May 2026

4 total trades

Most Recent

Sell MKSI

May 26, 2026 · $3.15M

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

Buys

0 · $0.00

Sells

4 · $27.05M

Total Shares Bought

Total Shares Sold

102,548

MKSI Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
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