SEC Form 4
GCT Semiconductor Holding, Inc. (GCTS) insider trading
In the 12 months to Oct 26, 2026, one GCTS insider reported open-market purchases of $58.1K across 2 filings; no open-market sales were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $0
- 0 filings · 0 insiders
- Open-market purchases
- $58.1K
- 2 filings · Hyunsoo Shin, Director
Who traded GCTS, and when
- Purchase
GCTS daily close from Oct 27, 2025 to Oct 26, 2026, between $0.99 and $3.73, last $1.28. 0 sale and 2 purchase filings by 1 insider, marked at their filing dates. Hyunsoo Shin, Director: bought $58.1K across 2 filings, first filed Nov 24, 2025, last Nov 28, 2025.
Largest mark · tap a row for others
Hyunsoo Shin · Director
Filing 1 of 2 within a week · $58,058 total
Purchase $36,650
28,633 shares at $1.28 avg
Filed Nov 24, 2025 · traded Nov 20
Close on filing date $1.35
Hyunsoo Shin · Director
Director
$58.1K boughtOpen-market trades
2 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Hyunsoo Shin | Director | — | $58.1K | 2 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Hyunsoo Shin Director | Purchase | 16,725 | $1.28 | $21.4K | 757,771 | |
traded | Hyunsoo Shin Director | Purchase | 28,633 | $1.28 | $36.7K | 741,046 |
GET /stocks/filings/vX/form-4?tickers=GCTS&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"GCTS",
"GCTS.WS"
],
"issuer_cik": "0001851961",
"owner_cik": "0002007757",
"accession_number": "0000929638-25-004392",
"form_type": "4",
"filing_date": "2025-11-28",
"period_of_report": "2025-11-25",
"issuer_name": "GCT Semiconductor Holding, Inc.",
"issuer_trading_symbol": "GCTS",
"owner_name": "Shin Hyunsoo",
"is_director": true,
"is_other": true,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2025-11-25",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 16725,
"transaction_price_per_share": 1.28,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 757771,
"transaction_value": 21408,
"direct_or_indirect": "D"
},
{
"tickers": [
"GCTS",
"GCTS.WS"
],
"issuer_cik": "0001851961",
"owner_cik": "0002007757",
"accession_number": "0000929638-25-004362",
"form_type": "4",
"filing_date": "2025-11-24",
"period_of_report": "2025-11-20",
"issuer_name": "GCT Semiconductor Holding, Inc.",
"issuer_trading_symbol": "GCTS",
"owner_name": "Shin Hyunsoo",
"is_director": true,
"is_other": true,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2025-11-21",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 3180,
"transaction_price_per_share": 1.28,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 741046,
"transaction_value": 4070.4,
"direct_or_indirect": "D"
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 29 records
- Grants and awards28 records
- Gifts1 record
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has GCT Semiconductor Holding, Inc.'s CEO sold stock?
No. John Schlaefer (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is GCTS’s insider data?
These are GCTS Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
Build with AI
Track GCTS insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for GCTS every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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