Lee John Tseng-Chung
SEC insider (Form 3/4/5 filer). CIK 0001414656. President & CEO at MKS INC (MKSI) and 1 other issuer. 37 reported Form 4/5 transactions since Sep 2024; latest on Aug 14, 2026. Located in ANDOVER, MA.
Companies Lee John Tseng-Chung has filed insider reports for
- MKS INC (MKSI): Director, Officer, President & CEO
- COGNEX CORP (CGNX): Director
Lee John Tseng-Chung
CIK: 0001414656
Transaction Breakdown
Open Market Buys (P)0 (0.0%)
High conviction signal
Open Market Sales (S)6 (16.2%)
Position reduction
Option Exercises (M)21 (56.8%)
Derivative conversions
Awards (A)6 (16.2%)
Compensation grants
Other (G, F, J, C, D, …)4 (10.8%)
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (37 total)
- Aug 14, 2026MKSI
MKS INC
SaleDirect10K shares at avg. $302.01$3.0M - May 22, 2026MKSI
MKS INC
SaleDirect10K shares at avg. $315.48$3.2M - Feb 21, 2026CGNX
COGNEX CORP
ExerciseDirect2.9K shares- - Feb 20, 2026MKSI
MKS INC
SaleDirect2K shares at avg. $257.81$513K - Feb 20, 2026MKSI
MKS INC
SaleDirect1.9K shares at avg. $259.70$491K - Feb 20, 2026MKSI
MKS INC
SaleDirect12.8K shares at avg. $256.93$3.3M - Feb 20, 2026MKSI
MKS INC
SaleDirect13.3K shares at avg. $256.05$3.4M - Feb 18, 2026CGNX
COGNEX CORP
ExerciseDirect8.3K shares- - Feb 17, 2026CGNX
COGNEX CORP
AwardDirectRestricted Stock Unit
4.8K shares- - Feb 17, 2026MKSI
MKS INC
ExerciseDirect22.1K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Aug 14, 2026 |  MKSI MKS INC | Sale | 10,000 | $302.01 | $3,020,100 | Direct |
| May 22, 2026 | MKSI MKS INC | Sale | 10,000 | $315.48 | $3,154,800 | Direct |
| Feb 21, 2026 |  CGNX COGNEX CORP | Exercise | 2,913 | - | $0 | Direct |
| Feb 20, 2026 | MKSI MKS INC | Sale | 1,988 | $257.81 | $512,523 | Direct |
| Feb 20, 2026 | MKSI MKS INC | Sale | 1,890 | $259.70 | $490,839 | Direct |
| Feb 20, 2026 | MKSI MKS INC | Sale | 12,812 | $256.93 | $3,291,804 | Direct |
| Feb 20, 2026 | MKSI MKS INC | Sale | 13,310 | $256.05 | $3,408,076 | Direct |
| Feb 18, 2026 | CGNX COGNEX CORP | Exercise | 8,324 | - | $0 | Direct |
| Feb 17, 2026 | CGNX COGNEX CORP | Award Restricted Stock Unit | 4,817 | - | - | Direct |
| Feb 17, 2026 | MKSI MKS INC | Exercise | 22,088 | - | $0 | Direct |
1-10 of 37 transactions