GCTS GCT Semiconductor Holding, Inc.
NYSE · SEC CIK 1851961 · EDGAR
- Bought, last 12 months
- $58.1K 2 purchases by 1 insiders
- Sold, last 12 months
- $0 0 sales by 0 insiders
- Filings on record
- 100 since 2023-11-17, latest 2026-09-14 16:32
BoughtSold
Most active insiders, 12 months
| Insider | Title | Bought | Sold |
|---|---|---|---|
| Shin Hyunsoo | Dir, Class II Dir | $58.1K | — |
| Chun Kukjin | Dir, Class I Dir | — | — |
| Barker Robert | Dir, Class II Dir | — | — |
| Kim Jeong-Min | CTO | — | — |
| TUDER JEFFREY | Dir, Class III Dir | — | — |
| Sum Alex | SVP of Sales, Marketing | — | — |
| Lee Kyeongho | Dir, COB, Class III Dir | — | — |
| Schlaefer John | Pres, CEO, Class III Dir, Dir | — | — |
| Cheng Edmond | CFO | — | — |
| Chan Nelson | Dir, Class I Dir | — | — |
Transactions 101
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-09-14 16:32 | 2026-09-10 | GCTS | Sum Alex | SVP of Sales, Marketing | A - Grant | $0.00 | +75.0K | 258.7K | +41% | $0 | |
| 2026-09-14 16:30 | 2026-09-10 | GCTS | Schlaefer John | Pres, CEO, Class III Dir, Dir | A - Grant | $0.00 | +150.0K | 352.7K | +74% | $0 | |
| 2026-09-14 16:28 | 2026-09-10 | GCTS | Kim Jeong-Min | CTO | A - Grant | $0.00 | +100.0K | 402.7K | +33% | $0 | |
| 2026-09-14 16:25 | 2026-09-10 | GCTS | Cheng Edmond | CFO | A - Grant | $0.00 | +145.0K | 296.0K | +96% | $0 | |
| 2026-07-07 16:03 | 2026-06-30 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +9,259 | 151.2K | +7% | $0 | |
| 2026-07-02 16:52 | 2026-06-30 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +9,259 | 151.7K | +6% | $0 | |
| 2026-07-02 16:51 | 2026-06-30 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +9,259 | 98.6K | +10% | $0 | |
| 2026-07-02 16:49 | 2026-06-30 | GCTS | Chan Nelson | Dir, Class I Dir | A - Grant | $0.00 | +9,259 | 134.9K | +7% | $0 | |
| 2026-07-02 16:48 | 2026-06-30 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +9,259 | 1.10M | +0.9% | $0 | |
| 2026-07-02 16:46 | 2026-06-30 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +9,259 | 814.1K | +1% | $0 | |
| 2026-04-02 16:04 | 2026-03-31 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +24.1K | 141.9K | +20% | $0 | |
| 2026-04-02 07:07 | 2026-03-31 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +24.1K | 1.09M | +2% | $0 | |
| 2026-04-02 07:05 | 2026-03-31 | GCTS | Chan Nelson | Dir, Class I Dir | A - Grant | $0.00 | +24.1K | 125.6K | +24% | $0 | |
| 2026-04-02 07:03 | 2026-03-31 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +24.1K | 89.4K | +37% | $0 | |
| 2026-04-02 07:02 | 2026-03-31 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +24.1K | 142.5K | +20% | $0 | |
| 2026-04-02 07:01 | 2026-03-31 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +24.1K | 804.8K | +3% | $0 | |
| 2026-03-06 | 2026-02-23 | GCTS | Chun Kukjin | Dir, Class I Dir | G - Gift | $0.00 | -40.0K | 65.3K | -38% | $0 | |
| 2026-01-05 | 2025-12-31 | GCTS | Chan Nelson | Dir, Class I Dir | A - Grant | $0.00 | +22.9K | 101.5K | +29% | $0 | |
| 2026-01-05 | 2025-12-31 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +22.9K | 1.06M | +2% | $0 | |
| 2026-01-05 | 2025-12-31 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +22.9K | 780.7K | +3% | $0 | |
| 2026-01-05 | 2025-12-31 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +22.9K | 105.3K | +28% | $0 | |
| 2026-01-05 | 2025-12-31 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +22.9K | 118.3K | +24% | $0 | |
| 2026-01-05 | 2025-12-31 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +22.9K | 117.8K | +24% | $0 | |
| 2025-11-28 | 2025-11-25 | GCTS | Shin Hyunsoo | Dir, Class II Dir | P - Purchase | $1.28 | +16.7K | 757.8K | +2% | +$21.4K | |
| M | 2025-11-24 | 2025-11-20+ | GCTS | Shin Hyunsoo | Dir, Class II Dir | P - Purchase | $1.28 | +28.6K | 737.9K | +4% | +$36.7K |
| 2025-10-03 | 2025-09-30 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +18.1K | 94.9K | +24% | $0 | |
| 2025-10-02 | 2025-09-30 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +18.1K | 712.4K | +3% | $0 | |
| 2025-10-02 | 2025-09-30 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +18.1K | 1.04M | +2% | $0 | |
| 2025-10-02 | 2025-09-30 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +18.1K | 82.3K | +28% | $0 | |
| 2025-10-02 | 2025-09-30 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +18.1K | 95.4K | +23% | $0 | |
| 2025-10-02 | 2025-09-30 | GCTS | Chan Nelson | Dir, Class I Dir | A - Grant | $0.00 | +18.1K | 78.6K | +30% | $0 | |
| 2025-09-30 | 2025-09-26 | GCTS | Schlaefer John | Pres, CEO, Class III Dir, Dir | J - Other | $0.00 | +555 | 202.7K | +0.3% | $0 | |
| 2025-09-23 | 2025-09-19 | GCTS | Kim Jeong-Min | CTO | A - Grant | $0.00 | +75.0K | 302.7K | +33% | $0 | |
| 2025-09-23 | 2025-09-19 | GCTS | Cheng Edmond | CFO | A - Grant | $0.00 | +75.0K | 151.0K | +99% | $0 | |
| 2025-09-23 | 2025-09-19 | GCTS | Schlaefer John | Pres, CEO, Class III Dir, Dir | A - Grant | $0.00 | +75.0K | 202.2K | +59% | $0 | |
| 2025-09-23 | 2025-09-19 | GCTS | Sum Alex | SVP of Sales, Marketing | A - Grant | $0.00 | +75.0K | 183.7K | +69% | $0 | |
| 2025-09-16 | 2025-09-12 | GCTS | Shin Hyunsoo | Dir, Class II Dir | P - Purchase | $1.51 | +44.1K | 694.3K | +7% | +$66.5K | |
| M | 2025-09-08 | 2025-09-04+ | GCTS | Shin Hyunsoo | Dir, Class II Dir | P - Purchase | $1.28 | +18.6K | 650.3K | +3% | +$23.8K |
| 2025-08-19 | 2025-08-15 | GCTS | Shin Hyunsoo | Dir, Class II Dir | P - Purchase | $1.26 | +121.0K | 631.7K | +24% | +$152.5K | |
| 2025-07-02 | 2025-06-30 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +18.5K | 76.8K | +32% | $0 | |
| 2025-07-02 | 2025-06-30 | GCTS | Chan Nelson | Dir, Class I Dir | A - Grant | $0.00 | +18.5K | 60.5K | +44% | $0 | |
| 2025-07-02 | 2025-06-30 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +18.5K | 77.3K | +31% | $0 | |
| 2025-07-02 | 2025-06-30 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +18.5K | 510.7K | +4% | $0 | |
| 2025-07-02 | 2025-06-30 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +18.5K | 64.2K | +40% | $0 | |
| 2025-07-02 | 2025-06-30 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +18.5K | 1.02M | +2% | $0 | |
| M | 2025-06-12 | 2025-06-10 | GCTS | Shin Hyunsoo | Dir, Class II Dir | P - Purchase | $1.18 | +85.0K | 492.2K | +21% | +$100.2K |
| M | 2025-06-06 | 2025-06-04+ | GCTS | Shin Hyunsoo | Dir, Class II Dir | P - Purchase | $1.02 | +160.0K | 327.2K | +96% | +$163.8K |
| 2025-05-27 | 2025-05-23 | GCTS | Shin Hyunsoo | Class II Dir, Dir | P - Purchase | $1.04 | +77.0K | 247.2K | +45% | +$80.1K | |
| 2025-05-21 | 2025-05-20 | GCTS | Shin Hyunsoo | Class II Dir, Dir | P - Purchase | $1.18 | +86.0K | 170.2K | +102% | +$101.5K | |
| D | 2025-04-23 | 2025-03-26 | GCTS | TUDER JEFFREY | Dir, Class III Dir | J - Other | — | +16.3K | 58.3K | +39% | — |
| DMA | 2025-04-14 | 2024-03-26 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +16.8K | 13.1K | New | $0 |
| DMA | 2025-04-07 | 2024-03-26 | GCTS | Kim Jeemee | CTO, VP of Engineering | A - Grant | $0.00 | +227.7K | 227.7K | New | $0 |
| 2025-04-02 | 2025-03-31 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +16.8K | 42.1K | +66% | $0 | |
| 2025-04-02 | 2025-03-31 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +16.8K | 1.00M | +2% | $0 | |
| 2025-04-02 | 2025-03-31 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +16.8K | 84.2K | +25% | $0 | |
| 2025-04-02 | 2025-03-31 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +16.8K | 45.8K | +58% | $0 | |
| 2025-04-02 | 2025-03-31 | GCTS | Chan Nelson | Dir, Class I Dir | A - Grant | $0.00 | +16.8K | 42.1K | +66% | $0 | |
| 2025-04-02 | 2025-03-31 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +16.8K | 58.9K | +40% | $0 | |
| D | 2025-03-28 | 2025-03-26 | GCTS | Concord Sponsor Group III LLC | 10% | J - Other | — | -3.10M | 632.6K | -83% | — |
| DMA | 2025-02-27 | 2024-03-26 | GCTS | Sum Alex | SVP of Sales, Marketing | A - Grant | $0.00 | +95.5K | 5,341 | New | $0 |
| DMA | 2025-02-27 | 2024-03-26 | GCTS | Schlaefer John | Pres, CEO, Class III Dir, Dir | A - Grant | $0.00 | +91.5K | 12.8K | New | $0 |
| D | 2025-02-21 | 2025-01-13 | GCTS | Schlaefer John | Pres, CEO, Class III Dir, Dir | M - OptEx | $0.11 | +35.7K | 127.2K | +39% | +$3,924 |
| D | 2025-02-21 | 2025-02-19 | GCTS | Sum Alex | SVP of Sales, Marketing | M - OptEx | $0.11 | +13.3K | 108.7K | +14% | +$1,458 |
| 2025-01-02 | 2024-12-31 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +11.8K | 41.2K | +40% | $0 | |
| 2025-01-02 | 2024-12-31 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +11.8K | 25.3K | +88% | $0 | |
| 2025-01-02 | 2024-12-31 | GCTS | CHAN NELSON C | Dir, Class I Dir | A - Grant | $0.00 | +11.8K | 25.3K | +88% | $0 | |
| 2025-01-02 | 2024-12-31 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +11.8K | 67.7K | +21% | $0 | |
| 2025-01-02 | 2024-12-31 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +11.8K | 1.70M | +0.7% | $0 | |
| 2025-01-02 | 2024-12-31 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +11.8K | 29.0K | +69% | $0 | |
| M | 2024-12-16 | 2024-12-13+ | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $2.57 | +38.0K | 55.9K | +212% | +$97.6K |
| 2024-11-21 | 2024-09-30 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +8,208 | 13.5K | +156% | $0 | |
| 2024-11-21 | 2024-09-30 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +8,208 | 17.2K | +92% | $0 | |
| 2024-11-21 | 2024-09-30 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +8,208 | 29.4K | +39% | $0 | |
| 2024-11-21 | 2024-09-30 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +8,208 | 17.9K | +85% | $0 | |
| 2024-11-21 | 2024-09-30 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +8,208 | 1.69M | +0.5% | $0 | |
| 2024-11-21 | 2024-09-30 | GCTS | CHAN NELSON C | Dir, Class I Dir | A - Grant | $0.00 | +8,208 | 13.5K | +156% | $0 | |
| D | 2024-09-27 | 2024-09-26 | GCTS | Anapass, Inc. | 10% | P - Purchase | $3.02 | +741.6K | 8.02M | +10% | +$2.24M |
| 2024-08-23 | 2024-08-21 | GCTS | Cheng Edmond | CFO | A - Grant | $0.00 | +76.0K | 76.0K | New | $0 | |
| 2024-07-05 | 2024-06-30 | GCTS | TUDER JEFFREY | Dir, Class III Dir | A - Grant | $0.00 | +5,278 | 5,278 | New | $0 | |
| 2024-07-03 | 2024-06-30 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +5,278 | 8,954 | +144% | $0 | |
| 2024-07-03 | 2024-06-30 | GCTS | CHAN NELSON C | Dir, Class I Dir | A - Grant | $0.00 | +5,278 | 5,278 | New | $0 | |
| 2024-07-03 | 2024-06-30 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +5,278 | 21.2K | +33% | $0 | |
| 2024-07-03 | 2024-06-30 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +5,278 | 1.68M | +0.3% | $0 | |
| 2024-07-03 | 2024-06-30 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +5,278 | 9,683 | +120% | $0 | |
| DA | 2024-05-03 | 2024-03-26 | GCTS | Anapass, Inc. | 10% | A - Grant | $0.00 | +7.28M | 7.28M | New | $0 |
| DMA | 2024-05-03 | 2024-03-26 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +961.2K | 93.4K | New | $0 |
| DM | 2024-03-28 | 2024-03-26 | GCTS | Concord Sponsor Group III LLC | 10% | J - Other | — | -2.97M | 4.99M | -37% | — |
| D | 2024-03-28 | 2024-03-26 | GCTS | Concord Sponsor Group III LLC | 10% | C - Cnv Deriv | — | +1 | 7.96M | +0.0% | — |
| DM | 2024-03-27 | 2024-03-26 | GCTS | Kim Jeemee | CTO, VP of Engineering | A - Grant | $0.00 | +227.7K | 215.3K | New | $0 |
| DM | 2024-03-27 | 2024-03-26 | GCTS | Sum Alex | VP of Marketing, Sales | A - Grant | $0.00 | +95.5K | 90.1K | New | $0 |
| DM | 2024-03-27 | 2024-03-26 | GCTS | Yoon David | VP of Fin | A - Grant | $0.00 | +38.3K | 8,204 | New | $0 |
| DM | 2024-03-27 | 2024-03-26 | GCTS | Schlaefer John | Pres, CEO, Class III Dir, Dir | A - Grant | $0.00 | +91.5K | 12.8K | New | $0 |
| DM | 2024-03-27 | 2024-03-26 | GCTS | Barker Robert | Dir, Class II Dir | A - Grant | $0.00 | +16.8K | 13.1K | New | $0 |
| M | 2024-03-27 | 2024-03-26 | GCTS | Lee Kyeongho | Dir, COB, Class III Dir | A - Grant | $0.00 | +961.2K | 867.8K | New | $0 |
| DM | 2024-03-27 | 2024-03-26 | GCTS | Shin Hyunsoo | Dir, Class II Dir | A - Grant | $0.00 | +4,191 | 3,735 | New | $0 |
| D | 2024-03-27 | 2024-03-26 | GCTS | Chun Kukjin | Dir, Class I Dir | A - Grant | $0.00 | +3,735 | 3,735 | New | $0 |
| 2024-03-27 | 2024-03-26 | GCTS | Anapass, Inc. | 10% | A - Grant | $0.00 | +7.28M | 7.28M | New | $0 | |
| D | 2023-11-17 | 2023-11-16 | GCTS | LEIBOWITZ LAWRENCE E | Dir | C - Cnv Deriv | — | +30.0K | 30.0K | New | — |
| D | 2023-11-17 | 2023-11-16 | GCTS | Concord Sponsor Group III LLC | 10% | C - Cnv Deriv | — | +7.96M | 7.96M | New | — |
| D | 2023-11-17 | 2023-11-16 | GCTS | Ort Peter | Dir | C - Cnv Deriv | — | +30.0K | 30.0K | New | — |
Purchase Sale Sale after option exercise All abbreviations