11 insiders reported 59 Form 4 transactions for GCT Semiconductor Holding, Inc. (GCTS) over the past 18 months (most recent 2026-09-14). Recent activity: Cheng Edmond (Chief Financial Officer) Buy 145,000 shares, Schlaefer John (President, CEO & Class III Dir) Buy 150,000 shares, Sum Alex (Sr. VP of Sales and Marketing) Buy 75,000 shares, Kim Jeong-Min (Chief Technology Officer) Buy 100,000 shares, TUDER JEFFREY (Director) Buy 9,259 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-14 | Cheng Edmond | Chief Financial Officer | Buy | 145,000 | $0 |
| 2026-09-14 | Schlaefer John | President, CEO & Class III Dir | Buy | 150,000 | $0 |
| 2026-09-14 | Sum Alex | Sr. VP of Sales and Marketing | Buy | 75,000 | $0 |
| 2026-09-14 | Kim Jeong-Min | Chief Technology Officer | Buy | 100,000 | $0 |
| 2026-07-07 | TUDER JEFFREY | Director | Buy | 9,259 | $0 |
| 2026-07-02 | Chan Nelson | Director | Buy | 9,259 | $0 |
| 2026-07-02 | Lee Kyeongho | Director | Buy | 9,259 | $0 |
| 2026-07-02 | Shin Hyunsoo | Director | Buy | 9,259 | $0 |
| 2026-07-02 | Barker Robert | Director | Buy | 9,259 | $0 |
| 2026-07-02 | Chun Kukjin | Director | Buy | 9,259 | $0 |
| 2026-04-02 | Lee Kyeongho | Director | Buy | 24,122 | $0 |
| 2026-04-02 | Shin Hyunsoo | Director | Buy | 24,122 | $0 |
| 2026-04-02 | Chun Kukjin | Director | Buy | 24,122 | $0 |
| 2026-04-02 | Chan Nelson | Director | Buy | 24,122 | $0 |
| 2026-04-02 | Barker Robert | Director | Buy | 24,122 | $0 |
| 2026-04-02 | TUDER JEFFREY | Director | Buy | 24,122 | $0 |
| 2026-03-06 | Chun Kukjin | Director | Sell | 40,000 | $0 |
| 2026-01-05 | Chan Nelson | Director | Buy | 22,916 | $0 |
| 2026-01-05 | TUDER JEFFREY | Director | Buy | 22,916 | $0 |
| 2026-01-05 | Shin Hyunsoo | Director | Buy | 22,916 | $0 |
| 2026-01-05 | Chun Kukjin | Director | Buy | 22,916 | $0 |
| 2026-01-05 | Barker Robert | Director | Buy | 22,916 | $0 |
| 2026-01-05 | Lee Kyeongho | Director | Buy | 22,916 | $0 |
| 2025-11-28 | Shin Hyunsoo | Director | Buy | 16,725 | $21,408 |
| 2025-11-24 | Shin Hyunsoo | Director | Buy | 25,453 | $32,580 |
来源：SEC Form 4 申报文件 · 截至 2026-09-14