Summary
Updated Aug 31, 2026
Hyunsoo Shin files SEC Form 4 reports at GCT Semiconductor Holding, Inc. (GCTS). 12 SEC Form 4 filings on record going back to 2024, most recently on 2 July 2026. Most recent open-market trade: bought $21K of GCTS on 28 November 2025. Lifetime open-market purchases: $301K. Historical track record: 2/5 stars across 7 tracked purchases.
Recent Transactions
16Every recent SEC Form 4 transaction Hyunsoo Shin has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★☆☆☆ (2/5) |
| Total purchases tracked | 7 |
| Purchases with forward-return data | 7 |
| 30-day win rate | 43% |
| 90-day win rate | 43% |
| Avg 5-day return | +4.47% |
| Avg 30-day return | +5.73% |
| Avg 90-day return | +0.87% |
| Best 30-day return | +23.62% |
Trading Pattern
InsiderAlpha's records for Hyunsoo Shin go back to 2024: 12 primary Form 4 filings, an average of 4.0 per year. The typical open-market purchase is $43K (7 buys totaling $301K). The largest single buy on record is $152K of GCTS in 2025. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Sector
No other insider has filed at Hyunsoo Shin's companies, so these are insiders reporting open-market trades at other companies in the same sector.
- SL SPV-2, L.P. - $341.29M of DELL open-market activity in the last 12 months
- Silver Lake Partners IV, L.P. - $319.53M of DELL open-market activity in the last 12 months
- Sanjay Gajendra - $308.78M of ALAB open-market activity in the last 12 months
- Luxco S.A R.L. Derby - $304.51M of WAY open-market activity in the last 12 months
- ADVENT INTERNATIONAL, L.P. - $289.86M of CCC open-market activity in the last 12 months
- Lauren Young - $289.86M of CCC open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Hyunsoo Shin?
Hyunsoo Shin is a corporate insider of GCT Semiconductor Holding, Inc. (GCTS). InsiderAlpha holds 12 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Hyunsoo Shin submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Hyunsoo Shin been buying or selling stock?
Recorded transactions: 7 open-market purchases ($301K) and 0 open-market sales across all tracked filings.
How accurate is Hyunsoo Shin's historical track record?
Across 7 tracked purchases, Hyunsoo Shin averaged +5.7% avg 30-day return with a 43% 30-day win rate. InsiderAlpha rates the track record at 2/5 stars.
Where can I see all of Hyunsoo Shin's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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