Lee John Tseng-Chung (CIK 1414656) reported 19 SEC Form 4 insider transactions across 2 companies over the past 18 months (most recent 2026-08-17). Recent activity: Sell MKSI (10,000 shares), Sell MKSI (10,000 shares), Buy CGNX (2,913 shares), Sell MKSI (1,988 shares), Sell MKSI (13,310 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-17 | MKS INC (MKSI) | President & CEO | Sell | 10,000 | $3.0M |
| 2026-05-26 | MKS INC (MKSI) | President & CEO | Sell | 10,000 | $3.2M |
| 2026-02-24 | COGNEX CORP (CGNX) | Director | Buy | 2,913 | $0 |
| 2026-02-23 | MKS INC (MKSI) | President & CEO | Sell | 1,988 | $512,526 |
| 2026-02-23 | MKS INC (MKSI) | President & CEO | Sell | 13,310 | $3.4M |
| 2026-02-23 | MKS INC (MKSI) | President & CEO | Sell | 12,812 | $3.3M |
| 2026-02-23 | MKS INC (MKSI) | President & CEO | Sell | 1,890 | $490,833 |
| 2026-02-19 | COGNEX CORP (CGNX) | Director | Buy | 8,324 | $0 |
| 2026-02-18 | MKS INC (MKSI) | President & CEO | Buy | 22,088 | $0 |
| 2026-02-18 | MKS INC (MKSI) | President & CEO | Buy | 7,654 | $0 |
| 2026-02-18 | MKS INC (MKSI) | President & CEO | Buy | 3,859 | $0 |
| 2026-02-18 | MKS INC (MKSI) | President & CEO | Buy | 7,208 | $0 |
| 2026-02-18 | MKS INC (MKSI) | President & CEO | Buy | 16,989 | $0 |
| 2026-02-18 | MKS INC (MKSI) | President & CEO | Buy | 12,091 | $0 |
| 2026-02-18 | MKS INC (MKSI) | President & CEO | Sell | 32,548 | $8.5M |
| 2025-11-04 | MKS INC (MKSI) | President & CEO | Buy | 352 | $0 |
| 2025-11-04 | MKS INC (MKSI) | President & CEO | Buy | 1,651 | $0 |
| 2025-11-04 | MKS INC (MKSI) | President & CEO | Sell | 2,003 | $287,851 |
| 2025-05-12 | COGNEX CORP (CGNX) | Director | Buy | 1,848 | $0 |
Source: SEC Form 4 filings · as of 2026-08-17