John Tseng-Chung Lee

Insider Reports History

Identity Names, identifiers, and filing context for this profile. 1 identity field
Reporting-owner location
Andover, MA
SEC source record Original filing metadata and source links for verification. 1 source field
Latest reporting-owner signature
/s/ M. Kathryn Rickards, attorney-in-fact
Source: Latest parsed Forms 3/4/5 signature
Source evidence Original filing metadata and source links for verification. 1 source field
Transaction source note
Rows are grouped by transaction date from the original SEC filing. Open the aggregated insider activity page to review issuer-level activity across dates.

Reported holdings for John Tseng-Chung Lee

Form 4 holding President & CEO, Director

MKS INC

Security class
Common Stock
Shares / value
144,696
Estimated value
$45,648,728
Report date
22 May 2026
Price
$315.48
Ownership
Direct
Form 4 holding President & CEO, Director

MKS INC

Security class
Restricted Stock Unit
Shares / value
84,828
Estimated value
$9,423,787
Report date
17 Feb 2026
Price
$104.53
Ownership
Direct
Underlying class
Common Stock
Underlying amount
Form 4 holding Director

COGNEX CORP

Security class
Restricted Stock Unit
Shares / value
0
Estimated value
$0
Report date
21 Feb 2026
Price
$39.37
Ownership
Direct
Underlying class
Common Stock
Underlying amount
4,817

Insider Reports Filed by John Tseng-Chung Lee

4 MKSI

MKS INC

Report period
22 May 2026
Transactions
1
Transaction value
-$3,154,800
Accepted by SEC
26 May 2026, 14:15
Role
President & CEO, Director
Next action
Open filing details
4 MKSI

MKS INC

Report period
20 Feb 2026
Transactions
4
Transaction value
-$7,703,242
Accepted by SEC
23 Feb 2026, 14:25
Role
President & CEO, Director
Next action
Open filing details
4 MKSI

MKS INC

Report period
17 Feb 2026
Transactions
14
Transaction value
-$8,486,646
Accepted by SEC
18 Feb 2026, 16:52
Role
President & CEO, Director
Next action
Open filing details
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