Reporting owner · CIK 0001414656

Lee John Tseng-Chung

Visual SEC Form 4 history across 2 companies, 39 transactions and 7 filings.

PRES, CEOPresident & CEOMKS INC
Open-market mix
Latest filingAug 17, 2026, 02:11 PM
Filings7Form 4 records
Buying$00 purchases
Selling$10.7M5 sales
Net value−$10.7MBuys minus sells
Companies22 securities
Most recentAug 14, 2026sale

Open-market buy performance

90-day forward return on this insider's open-market purchases

90d forward
Forward return is not available yet

We compute this from each buy's stock performance 90 days after the transaction. The price history is still being populated for this insider's their open-market buys, so the average and median will appear here once the daily price refresh has covered the relevant trading days.

Monthly open-market activity

Reported purchase and sale transaction counts

Buys Sells
530-3-5Feb 254Feb 261Aug 26

Net value flow

Buys minus sells

Feb 25
$0
Feb 26
−$7.7M
Aug 26
−$3M

Transaction texture

Ownership and ticket size

Average P/S size$2.1M
Median P/S size$3M
Direct39
Indirect0
Aug 14, 2026sale

Filing-only signals

Deterministic matches in this insider's history

Derivative Transactionfiling-context19Direct Ownershipfiling-context39Large Holdings Increaseholdings3Large Holdings Reductionholdings1Large Salesize3Repeat Sellerpattern310b5-1 Detectedfiling-context1

Latest Form 4 facts

Quick context from source filings

Latest buy

No open-market insider purchase is available.

Associated companies

Visual map of known reporting history

MKSIMKS INC6 transactions · latest Aug 17, 2026, 02:11 PMCGNXCOGNEX CORP5 transactions · latest Feb 24, 2025, 09:32 PMMKSIMKS INSTRUMENTS INC28 transactions · latest Feb 19, 2025, 11:21 PM
TickerInsiderRoleTypeSharesValueCodeSignals90d returnFiledTrans date
MKSILee John Tseng-Chung
PRESCEO
sale10b5-110.0k-$302MS
Direct Ownership Large Sale 10b5-1 Detected
−23.2%08/1708/14
MKSILee John Tseng-Chung
PRESCEO
sale1.89k-$49.0MS
Direct Ownership Repeat Seller
+26.4%02/2302/20
MKSILee John Tseng-Chung
PRESCEO
sale1.98k-$51.2MS
Direct Ownership Repeat Seller
+26.4%02/2302/20
MKSILee John Tseng-Chung
PRESCEO
sale12.8k-$329MS
Direct Ownership Large Sale Repeat Seller
+26.4%02/2302/20
MKSILee John Tseng-Chung
PRESCEO
sale13.3k-$340MS
Direct Ownership Large Sale
+26.4%02/2302/20
MKSILee John Tseng-Chung
PRESCEO
grant50.9k—A
Derivative Transaction Direct Ownership Large Holdings Increase
+25.0%02/0902/08
CGNXLee John Tseng-Chung
DIR
exercise1.74k$0M
Derivative Transaction Direct Ownership Large Holdings Reduction
—02/24/202502/21/2025
CGNXLee John Tseng-Chung
DIR
exercise6.97k$0M
Derivative Transaction Direct Ownership
—02/24/202502/20/2025
CGNXLee John Tseng-Chung
DIR
exercise1.74k$0M
Direct Ownership
—02/24/202502/21/2025
CGNXLee John Tseng-Chung
DIR
exercise6.97k$0M
Direct Ownership Large Holdings Increase
—02/24/202502/20/2025

Lee John Tseng-Chung Insider Activity FAQ

SEC Form 4 context

Who is Lee John Tseng-Chung?

Lee John Tseng-Chung is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001414656.

Which companies has Lee John Tseng-Chung reported transactions for?

MKS INC, COGNEX CORP, MKS INSTRUMENTS INC

When was Lee John Tseng-Chung's latest insider buy?

No open-market insider purchase is available for this period.

When was Lee John Tseng-Chung's latest insider sale?

sale at MKS INC on Aug 14, 2026 valued at $3,020,100.

Where can I see the original SEC filings?

Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.

Are performance metrics included?

This version does not calculate win rates, forward returns, benchmark-adjusted returns, or high-conviction scores.