GCTS (GCT Semiconductor Holding, Inc.)
Insider Trading Activity
Every open-market purchase and sale reported by GCTS officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-14 | Jeong-Min Kim | Chief Technology Officer | A | — | — |
| 2026-09-14 | Edmond Cheng | Chief Financial Officer | A | — | — |
| 2026-09-14 | John Schlaefer | President, CEO & Class III Dir | A | — | — |
| 2026-09-14 | Alex Sum | Sr. VP of Sales and Marketing | A | — | — |
| 2026-07-07 | JEFFREY TUDER | Director | A | — | — |
| 2026-07-02 | Kukjin Chun | Director | A | — | — |
| 2026-07-02 | Robert Barker | Director | A | — | — |
| 2026-07-02 | Hyunsoo Shin | Director | A | — | — |
| 2026-07-02 | Kyeongho Lee | Director | A | — | — |
| 2026-07-02 | Nelson Chan | Director | A | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | Director | 1,096,122 | — |
| — | Director | 814,068 | — |
| — | Chief Technology Officer | 402,701 | — |
| — | President, CEO & Class III Dir | 352,728 | — |
| — | Chief Financial Officer | 296,000 | — |
| — | Sr. VP of Sales and Marketing | 258,743 | — |
| — | Director | 151,710 | — |
| — | Director | 151,190 | — |
| — | Director | 134,901 | — |
| — | Director | 98,636 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the GCTS quote page; the site-wide leaderboard is on the insider transactions hub.