🕵️ GCT Semiconductor Holding, Inc. ($GCTS)
SEC insider & ownership activity, last 12 months · CIK 1851961 · every row links its SEC filing
Over the last 12 months insiders bought $58K with no open-market selling against it. Shin Hyunsoo bought $58K in discretionary trades (Nov). SUNP Corp trimmed 8.3% → 5.2%. No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $58K (3 lots) · 0 sellers, $0 (0 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Shin Hyunsoo | 3 | $58K | 0 | – | Nov 25, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| SUNP Corp | 5.2% | 13G | Aug 22, 2025 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Officer/director changes (5.02) | Sep 10, 2026 | filing ↗ |
| Earnings (2.02) | Aug 10, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 10, 2026 | filing ↗ |
| Other events (8.01) | Jun 18, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 18, 2026 | filing ↗ |
| Earnings (2.02) | Jun 18, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 18, 2026 | filing ↗ |
| Earnings (2.02) | May 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 12, 2026 | filing ↗ |
| Earnings (2.02) | Mar 25, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 25, 2026 | filing ↗ |
| Material agreement (1.01) | Feb 24, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 24, 2026 | filing ↗ |
| Other events (8.01) | Jan 29, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 29, 2026 | filing ↗ |
| Material agreement (1.01) | Dec 15, 2025 | filing ↗ |
| New financial obligation (2.03) | Dec 15, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 15, 2025 | filing ↗ |
| Earnings (2.02) | Nov 12, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 12, 2025 | filing ↗ |
| Shareholder vote (5.07) | Sep 18, 2025 | filing ↗ |