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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.

Insider roster for GCT Semiconductor Holding, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Sum AlexSr. VP of Sales and Marketing258,743Sep 14, 20261
Schlaefer JohnPresident, CEO & Class III Dir352,728Sep 14, 20262
Kim JeemeeChief Technology Officer402,701Sep 14, 20261
Cheng EdmondChief Financial Officer296,000Sep 14, 20261
Tuder JeffreyDirector, Other: Class III Director151,190Jul 7, 20264
Barker RobertDirector, Other: Class II Director151,710Jul 2, 20264
Chun KukjinDirector, Other: Class I Director98,636Jul 2, 20265
Chan Nelson CDirector, Other: Class I Director134,901Jul 2, 20264
Lee KyeonghoDirector, Other: Chairman & Class III Director1,096,122Jul 2, 20264
Shin HyunsooDirector, Other: Class II Director814,068Jul 2, 20266
Concord Sponsor Group III LLC10% Owner632,586Mar 28, 20250
Anapass, Inc.10% Owner8,017,466Sep 27, 20240
Yoon DavidVice President of Finance8,204Mar 27, 20240
Leibowitz Lawrence EDirector30,000Nov 17, 20230
Ort PeterDirector30,000Nov 17, 20230
King Thomas C.Director30,000Nov 17, 20230

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.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Nov 28, 2025 (view filing)Nov 253 daysShin HyunsooDirector, Other: Class II DirectorPPurchase+16.7K$1.28+$21.4K+2.3%757.8K after
Nov 24, 2025 (view filing)Nov 20-214 daysShin HyunsooDirector, Other: Class II DirectorPPurchase+28.6K$1.28+$36.7K+4.0%741.0K after2 lots
Sep 16, 2025 (view filing)Sep 124 daysShin HyunsooDirector, Other: Class II DirectorPPurchase+44.1K$1.51+$66.5K+6.8%694.3K after
Sep 8, 2025 (view filing)Sep 4-54 daysShin HyunsooDirector, Other: Class II DirectorPPurchase+18.6K$1.28+$23.8K+2.9%650.3K after2 lots
Aug 19, 2025 (view filing)Aug 154 daysShin HyunsooDirector, Other: Class II DirectorPPurchase+121.0K$1.26+$152.5K+23.7%631.7K after
Jun 12, 2025 (view filing)Jun 102 daysShin HyunsooDirector, Other: Class II DirectorPPurchase+85.0K$1.18+$100.2K+20.9%492.2K after2 lots
Jun 6, 2025 (view filing)Jun 4-52 daysShin HyunsooDirector, Other: Class II DirectorPPurchase+160.0K$1.02+$163.8K+64.7%407.2K after3 lots
May 27, 2025 (view filing)May 234 daysShin HyunsooClass II DirectorPPurchase+77.0K$1.04+$80.1K+45.2%247.2K after
May 21, 2025 (view filing)May 201 dayShin HyunsooClass II DirectorPPurchase+86.0K$1.18+$101.5K+102.1%170.2K after
Sep 27, 2024 (view filing)Sep 261 dayAnapass, Inc.10% OwnerPPurchase+741.6K$3.02+$2.24M+10.2%8.02M after
Sep 27, 2024 (view filing)Sep 261 dayAnapass, Inc.10% OwnerPPurchase+148.3K$0.00$0–148.3K afterDerivative