Lee John Tseng-Chung

Insider

President & CEO

Trades at: MKSI· CGNX

30D 90D 1Y

Net shares · 365d

-40.0K

0 buy · 40.0K sell

Net value · 365d

-$10.9M

$0 in · $10.9M out

Sentiment · 365d

Net selling

0% buying · 100% selling

Open-market trades · 365d

0 buy · 40.0K sell

Trading track record · all companies

Running net of open-market buys − sells across every company. Tap the line or a marker for details. ▲ buy · ▼ sell.

Transactions · 365d

Open-market Buys Sells All types

MKSI Sell·S
May 22, 26

President & CEO · 10b5-1

$3.2M

10.0K sh · $315.48

Own -6%
CGNX Exercise·M
Feb 21, 26

Director

$0

2.9K sh

Own New
CGNX Exercise·M
Feb 21, 26

Director

$0

2.9K sh

Own +13%
MKSI Sell·S
Feb 20, 26

President & CEO

$7.7M

30.0K sh · $256.77 avg · 4 lots

Own -15%
CGNX Exercise·M
Feb 18, 26

Director

$0

8.3K sh

Own New
CGNX Exercise·M
Feb 18, 26

Director

$0

8.3K sh

Own +61%
MKSI Exercise·M
Feb 17, 26

President & CEO

—

69.9K sh · 6 lots

Own +127%
MKSI Grant·A
Feb 17, 26

President & CEO

—

15.6K sh

Own +11%
MKSI Exercise·M
Feb 17, 26

President & CEO

—

69.9K sh · 6 lots

Own +52%
MKSI Other·F
Feb 17, 26

President & CEO

$8.5M

32.5K sh · $260.74

Own -15%
CGNX Grant·A
Feb 17, 26

Director

$0

4.8K sh

Own New
MKSI Grant·A
Feb 8, 26

President & CEO

—

51.0K sh

Own +58%
MKSI Exercise·M
Oct 31, 25

President & CEO

—

2.0K sh · 2 lots

Own +2%
MKSI Exercise·M
Oct 31, 25

President & CEO

—

2.0K sh · 2 lots

Own +1%
MKSI Other·F
Oct 31, 25

President & CEO

$287.9K

2.0K sh · $143.71

Own -1%

Date▾	Ticker	Role	Type	Shares	Own Δ	Price	Value
May 22, 2026	MKSI	President & CEO	Sell S	10.0K	-6%	$315.48	$3.2M
Feb 21, 2026	CGNX	Director	Exercise M	2.9K	New	—	$0
Feb 21, 2026	CGNX	Director	Exercise M	2.9K	+13%	—	$0
Feb 20, 2026	MKSI	President & CEO	Sell S	30.0K4 lots	-15%	$256.77 avg	$7.7M
Feb 18, 2026	CGNX	Director	Exercise M	8.3K	New	—	$0
Feb 18, 2026	CGNX	Director	Exercise M	8.3K	+61%	—	$0
Feb 17, 2026	MKSI	President & CEO	Exercise M	69.9K6 lots	+127%	—	—
Feb 17, 2026	MKSI	President & CEO	Grant A	15.6K	+11%	—	—
Feb 17, 2026	MKSI	President & CEO	Exercise M	69.9K6 lots	+52%	—	—
Feb 17, 2026	MKSI	President & CEO	Other F	32.5K	-15%	$260.74	$8.5M
Feb 17, 2026	CGNX	Director	Grant A	4.8K	New	—	$0
Feb 8, 2026	MKSI	President & CEO	Grant A	51.0K	+58%	—	—
Oct 31, 2025	MKSI	President & CEO	Exercise M	2.0K2 lots	+2%	—	—
Oct 31, 2025	MKSI	President & CEO	Exercise M	2.0K2 lots	+1%	—	—
Oct 31, 2025	MKSI	President & CEO	Other F	2.0K	-1%	$143.71	$287.9K

Buy Sell Non-market (grant · exercise · gift)

About Lee John Tseng-Chung

This profile aggregates every SEC Form 4 insider transaction reported by Lee John Tseng-Chung across all companies they trade. Open-market purchases (code P) and sales (code S) are the highest-signal, discretionary trades; grants (A), option exercises (M) and gifts (G) reflect compensation rather than conviction and carry no market price. Figures cover the selected period and update as new filings are ingested.