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John Tseng-Chung Lee

CIK 1414656 · President & CEO · last filed 2026-05-26

John Tseng-Chung Lee is a President & CEO who has filed 108 SEC Form 4 insider transactions across 2 companies since 2007. The most recent filing shows the insider sold $3.2M of MKSI on May 26, 2026. Across all open-market trades the lifetime net is −$15.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $43.9M across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$43.90M

Companies

2

Total Filings

108

Lifetime Open-Market Net

-$15.93M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
MKSI President & CEO 144,696 $292.35 $42.30M -$15.93M 96 2026-05-26
CGNX Director 24,820 $64.36 $1.60M $0 10 2026-02-24

Recent Filings

108 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-05-26 MKSI Sell (S) −10,000 -$3.15M EDGAR
2026-05-22 MKSI Notice (144) −10,000 -$3.15M EDGAR
2026-02-24 CGNX Exer (M) +2,913 $0 EDGAR
2026-02-23 MKSI Sell (S) −30,000 -$7.70M EDGAR
2026-02-20 MKSI Notice (144) −30,000 -$7.43M EDGAR
2026-02-19 CGNX Mixed +8,324 $0 EDGAR
2026-02-18 MKSI Mixed +37,340 -$8.49M EDGAR
2026-02-09 MKSI Grant (A) — $0 EDGAR
2025-11-04 MKSI Mixed — -$287.9K EDGAR
2025-05-12 CGNX Exer (M) +1,848 $0 EDGAR
Showing 1–10 of 108
Page 1 of 11
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.