GCT Semiconductor Holding, Inc.
GCTS- Exchange
- NYSE
- Industry
- Semiconductors & Related Devices
- SEC CIK
- 0001851961
No open-market purchases or sales by GCT Semiconductor Holding, Inc. insiders were filed in the last 90 days; 55 institutions reported holding it in 13F filings for Q2 2026, worth $37.3M in total; no superinvestor holds it.
Other share classesGCTS.WT
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by GCT Semiconductor Holding, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 0 filings
- Insiders trading
- 0
- Net value
- $0
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for GCT Semiconductor Holding, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Sum Alex | Sr. VP of Sales and Marketing | 258,743 | Sep 14, 2026 | 1 |
| Schlaefer John | President, CEO & Class III Dir | 352,728 | Sep 14, 2026 | 2 |
| Kim Jeemee | Chief Technology Officer | 402,701 | Sep 14, 2026 | 1 |
| Cheng Edmond | Chief Financial Officer | 296,000 | Sep 14, 2026 | 1 |
| Tuder Jeffrey | Director, Other: Class III Director | 151,190 | Jul 7, 2026 | 4 |
| Barker Robert | Director, Other: Class II Director | 151,710 | Jul 2, 2026 | 4 |
| Chun Kukjin | Director, Other: Class I Director | 98,636 | Jul 2, 2026 | 5 |
| Chan Nelson C | Director, Other: Class I Director | 134,901 | Jul 2, 2026 | 4 |
| Lee Kyeongho | Director, Other: Chairman & Class III Director | 1,096,122 | Jul 2, 2026 | 4 |
| Shin Hyunsoo | Director, Other: Class II Director | 814,068 | Jul 2, 2026 | 6 |
| Concord Sponsor Group III LLC | 10% Owner | 632,586 | Mar 28, 2025 | 0 |
| Anapass, Inc. | 10% Owner | 8,017,466 | Sep 27, 2024 | 0 |
| Yoon David | Vice President of Finance | 8,204 | Mar 27, 2024 | 0 |
| Leibowitz Lawrence E | Director | 30,000 | Nov 17, 2023 | 0 |
| Ort Peter | Director | 30,000 | Nov 17, 2023 | 0 |
| King Thomas C. | Director | 30,000 | Nov 17, 2023 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Nov 28, 2025 (view filing) | Nov 25 | 3 days | Shin HyunsooDirector, Other: Class II Director | PPurchase | +16.7K | $1.28 | +$21.4K | +2.3%757.8K after | |
| Nov 24, 2025 (view filing) | Nov 20-21 | 4 days | Shin HyunsooDirector, Other: Class II Director | PPurchase | +28.6K | $1.28 | +$36.7K | +4.0%741.0K after | 2 lots |
| Sep 16, 2025 (view filing) | Sep 12 | 4 days | Shin HyunsooDirector, Other: Class II Director | PPurchase | +44.1K | $1.51 | +$66.5K | +6.8%694.3K after | |
| Sep 8, 2025 (view filing) | Sep 4-5 | 4 days | Shin HyunsooDirector, Other: Class II Director | PPurchase | +18.6K | $1.28 | +$23.8K | +2.9%650.3K after | 2 lots |
| Aug 19, 2025 (view filing) | Aug 15 | 4 days | Shin HyunsooDirector, Other: Class II Director | PPurchase | +121.0K | $1.26 | +$152.5K | +23.7%631.7K after | |
| Jun 12, 2025 (view filing) | Jun 10 | 2 days | Shin HyunsooDirector, Other: Class II Director | PPurchase | +85.0K | $1.18 | +$100.2K | +20.9%492.2K after | 2 lots |
| Jun 6, 2025 (view filing) | Jun 4-5 | 2 days | Shin HyunsooDirector, Other: Class II Director | PPurchase | +160.0K | $1.02 | +$163.8K | +64.7%407.2K after | 3 lots |
| May 27, 2025 (view filing) | May 23 | 4 days | Shin HyunsooClass II Director | PPurchase | +77.0K | $1.04 | +$80.1K | +45.2%247.2K after | |
| May 21, 2025 (view filing) | May 20 | 1 day | Shin HyunsooClass II Director | PPurchase | +86.0K | $1.18 | +$101.5K | +102.1%170.2K after | |
| Sep 27, 2024 (view filing) | Sep 26 | 1 day | Anapass, Inc.10% Owner | PPurchase | +741.6K | $3.02 | +$2.24M | +10.2%8.02M after | |
| Sep 27, 2024 (view filing) | Sep 26 | 1 day | Anapass, Inc.10% Owner | PPurchase | +148.3K | $0.00 | $0 | –148.3K after | Derivative |