GCT Semiconductor Holding, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Shin Hyunsoo | — | Purchase | 16,725 | $1.28 | $21,408 | 757,771 | Nov 25, 2025 |
| Shin Hyunsoo | — | Purchase | 25,453 | $1.28 | $32,580 | 737,866 | Nov 21, 2025 |
| TUDER JEFFREY | — | Award / Grant | 18,092 | — | — | 94,893 | Sep 30, 2025 |
| Shin Hyunsoo | — | Award / Grant | 18,092 | — | — | 712,413 | Sep 30, 2025 |
| Lee Kyeongho | — | Award / Grant | 18,092 | — | — | 1,039,825 | Sep 30, 2025 |
| Chun Kukjin | — | Award / Grant | 18,092 | — | — | 82,339 | Sep 30, 2025 |
| Chan Nelson | — | Award / Grant | 18,092 | — | — | 78,604 | Sep 30, 2025 |
| Barker Robert | — | Award / Grant | 18,092 | — | — | 95,413 | Sep 30, 2025 |
| Schlaefer John | President, CEO & Class III Dir | Other | 555 | — | — | 202,728 | Sep 26, 2025 |
| Kim Jeong-Min | Chief Technology Officer | Award / Grant | 75,000 | — | — | 302,701 | Sep 19, 2025 |
| Schlaefer John | President, CEO & Class III Dir | Award / Grant | 75,000 | — | — | 202,173 | Sep 19, 2025 |
| Cheng Edmond | Chief Financial Officer | Award / Grant | 75,000 | — | — | 151,000 | Sep 19, 2025 |
| Sum Alex | Sr. VP of Sales and Marketing | Award / Grant | 75,000 | — | — | 183,743 | Sep 19, 2025 |
| Shin Hyunsoo | — | Purchase | 44,067 | $1.51 | $66,541 | 694,321 | Sep 12, 2025 |
| Shin Hyunsoo | — | Purchase | 10,300 | $1.30 | $13,390 | 650,254 | Sep 4, 2025 |
| Shin Hyunsoo | — | Purchase | 121,000 | $1.26 | $152,460 | 631,704 | Aug 15, 2025 |
| TUDER JEFFREY | — | Award / Grant | 18,456 | — | — | 76,801 | Jun 30, 2025 |
| Shin Hyunsoo | — | Award / Grant | 18,456 | — | — | 510,704 | Jun 30, 2025 |
| Lee Kyeongho | — | Award / Grant | 18,456 | — | — | 1,021,733 | Jun 30, 2025 |
| Chun Kukjin | — | Award / Grant | 18,456 | — | — | 64,247 | Jun 30, 2025 |
| Chan Nelson | — | Award / Grant | 18,456 | — | — | 60,512 | Jun 30, 2025 |
| Barker Robert | — | Award / Grant | 18,456 | — | — | 77,321 | Jun 30, 2025 |
| Shin Hyunsoo | — | Purchase | 45,000 | $1.16 | $52,200 | 492,248 | Jun 10, 2025 |
| Shin Hyunsoo | — | Purchase | 80,000 | $1.02 | $81,600 | 327,248 | Jun 5, 2025 |
| Shin Hyunsoo | Class II Director | Purchase | 77,000 | $1.04 | $80,080 | 247,248 | May 23, 2025 |
| Shin Hyunsoo | Class II Director | Purchase | 86,000 | $1.18 | $101,480 | 170,248 | May 20, 2025 |
| Barker Robert | — | Award / Grant | 16,768 | — | — | 58,865 | Mar 31, 2025 |
| Shin Hyunsoo | — | Award / Grant | 16,768 | — | — | 84,248 | Mar 31, 2025 |
| Chun Kukjin | — | Award / Grant | 16,768 | — | — | 45,791 | Mar 31, 2025 |
| Lee Kyeongho | — | Award / Grant | 16,768 | — | — | 1,003,277 | Mar 31, 2025 |
| TUDER JEFFREY | — | Award / Grant | 16,768 | — | — | 42,056 | Mar 31, 2025 |
| Chan Nelson | — | Award / Grant | 16,768 | — | — | 42,056 | Mar 31, 2025 |
| Concord Sponsor Group III LLC | — | Other | 3,101,241 | — | — | 632,586 | Mar 26, 2025 |
| TUDER JEFFREY | — | Other | 16,289 | — | — | 58,345 | Mar 26, 2025 |
| Sum Alex | Sr. VP of Sales and Marketing | Option Exercise | 13,259 | $0.11 | $1,458 | 108,743 | Feb 19, 2025 |
| Schlaefer John | President, CEO & Class III Dir | Option Exercise | 35,669 | $0.11 | $3,924 | 127,173 | Jan 13, 2025 |
| TUDER JEFFREY | — | Award / Grant | 11,802 | — | — | 25,288 | Dec 31, 2024 |
| Shin Hyunsoo | — | Award / Grant | 11,802 | — | — | 67,693 | Dec 31, 2024 |
| Lee Kyeongho | — | Award / Grant | 11,802 | — | — | 1,697,279 | Dec 31, 2024 |
| Chun Kukjin | — | Award / Grant | 11,802 | — | — | 28,964 | Dec 31, 2024 |
| CHAN NELSON C | — | Award / Grant | 11,802 | — | — | 25,288 | Dec 31, 2024 |
| Barker Robert | — | Award / Grant | 11,802 | — | — | 41,162 | Dec 31, 2024 |
| Shin Hyunsoo | — | Award / Grant | 37,000 | $2.57 | $95,090 | 55,891 | Dec 13, 2024 |
| TUDER JEFFREY | — | Award / Grant | 8,208 | — | — | 13,486 | Sep 30, 2024 |
| Shin Hyunsoo | — | Award / Grant | 8,208 | — | — | 17,891 | Sep 30, 2024 |
| Lee Kyeongho | — | Award / Grant | 8,208 | — | — | 1,685,477 | Sep 30, 2024 |
| Chun Kukjin | — | Award / Grant | 8,208 | — | — | 17,162 | Sep 30, 2024 |
| CHAN NELSON C | — | Award / Grant | 8,208 | — | — | 13,486 | Sep 30, 2024 |
| Barker Robert | — | Award / Grant | 8,208 | — | — | 29,360 | Sep 30, 2024 |
| Anapass, Inc. | — | Purchase | 741,603 | $3.02 | $2,239,641 | 8,017,466 | Sep 26, 2024 |