Hyunsoo Shin is Director at GCT Semiconductor Holding, Inc. (GCTS). They have made 9 open-market trades across 1 company since 2025, most recently 2026-09-30.
CIK 0002007757
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
9 open-market purchases totalling $813K since 2025, never a sale. Across 9 scored buys the stock is up 4.4% at ninety days, and 1.3 points behind the S&P over the same stretch.
9 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| GCTS | 827,039 | $1.3M |
Shares reported on the most recent Form 4, priced at the 2026-10-02 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 56% | 67% | 67% |
| Avg Move | +7.4% | +13.9% | +4.4% |
| Alpha | +6.1% | +11.1% | -1.3% |
| Scored | 9 | 9 | 9 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| GCTS | BUY | 2025-11-25 | 2025-11-28 | $1.28 | $21K | +6.8% | -9.0% | -14.3% |
| GCTS | BUY | 2025-11-20 | 2025-11-24 | $1.28 | $37K | +0.0% | -12.7% | -9.2% |
| GCTS | BUY | 2025-09-12 | 2025-09-16 | $1.51 | $133K | -5.6% | -9.9% | -11.2% |
| GCTS | BUY | 2025-09-04 | 2025-09-08 | $1.28 | $24K | +25.9% | +13.3% | +5.2% |
| GCTS | BUY | 2025-08-15 | 2025-08-19 | $1.26 | $152K | +10.0% | +41.7% | +11.7% |
| GCTS | BUY | 2025-06-10 | 2025-06-12 | $1.18 | $100K | +6.8% | +3.8% | +12.8% |
| GCTS | BUY | 2025-06-04 | 2025-06-06 | $1.02 | $164K | +33.3% | +25.7% | +21.0% |
| GCTS | BUY | 2025-05-23 | 2025-05-27 | $1.04 | $80K | -4.6% | +37.0% | +14.8% |
| GCTS | BUY | 2025-05-20 | 2025-05-21 | $1.18 | $101K | -5.6% | +35.2% | +9.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.