GCT Semiconductor Holding, Inc.
GCT Semiconductor Holding, Inc. (GCTS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · GCTS · as of Mar 31, 2025
Ownership Breakdown
42
Institutional Holders
▲ 1 vs Q4
$5.87M
Total Inst. Value
▼ $1.22M vs Q4
57.20M
Shares Outstanding
freeFloat 77.07%
3.58M
13F Shares Held
▲ 495,272 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
GCTS largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC semiconductors & related devices | 881.9K | 1.93% | 1.93% | $1.45B | May 9, 2025 | ▲ 147.7K |
BLACKROCK, INC. semiconductors & related devices | 868.3K | 1.90% | 1.90% | $1.42B | May 2, 2025 | ▼ 8.1K |
UBS GROUP AG semiconductors & related devices | 502.3K | 1.10% | 1.10% | $823.71M | May 13, 2025 | ▲ 478.0K |
GEODE CAPITAL MANAGEMENT, LLC semiconductors & related devices | 435.9K | 95.51% | 95.51% | $715.22M | May 13, 2025 | ▲ 10.8K |
STATE STREET CORP semiconductors & related devices | 163.9K | 35.90% | 35.90% | $268.77M | May 15, 2025 | ▲ 1.2K |
NORTHERN TRUST CORP semiconductors & related devices | 107.8K | 23.62% | 23.62% | $176.83M | May 13, 2025 | ▲ 1.3K |
MOORE CAPITAL MANAGEMENT, LP semiconductors & related devices | 71.3K | 15.61% | 15.61% | $116.85M | Aug 12, 2025 | — held |
GOLDMAN SACHS GROUP INC semiconductors & related devices | 69.9K | 15.32% | 15.32% | $114.66M | Jun 27, 2025 | ▲ 25.5K |
PERISCOPE CAPITAL INC. semiconductors & related devices | 65.0K | 14.24% | 14.24% | $106.60M | May 13, 2025 | ▼ 35.0K |
B. RILEY FINANCIAL, INC. semiconductors & related devices | 56.8K | 12.45% | 12.45% | $93.18M | Feb 3, 2026 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
13
Increased
+678.2K shares5
New Positions
first time holders14
Decreased
−171.1K shares4
Sold Out
fully exitedNet shares change (top 50)
+507.1K
+678.2K / −171.1K
Net new holders
+0
5 new / 4 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
GCTS insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
6
Buy transactions
1
Sell transactions
6.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
TUDER JEFFREY Class III Director | Mar 31, 2026 | Award | 24,122 | — | — | 141.9K | Form 4 ↗ |
Lee Kyeongho Chairman & Class III Director | Mar 31, 2026 | Award | 24,122 | — | — | 1.09M | Form 4 ↗ |
Chan Nelson Class I Director | Mar 31, 2026 | Award | 24,122 | — | — | 125.6K | Form 4 ↗ |
Chun Kukjin Class I Director | Mar 31, 2026 | Award | 24,122 | — | — | 89.4K | Form 4 ↗ |
Barker Robert Class II Director | Mar 31, 2026 | Award | 24,122 | — | — | 142.5K | Form 4 ↗ |
Shin Hyunsoo Class II Director | Mar 31, 2026 | Award | 24,122 | — | — | 804.8K | Form 4 ↗ |
Chun Kukjin Class I Director | Feb 23, 2026 | Gift | 40,000 | — | — | 65.3K | Form 4 ↗ |
TUDER JEFFREY Class III Director | Dec 31, 2025 | Award | 22,916 | — | — | 117.8K | Form 4 ↗ |
Barker Robert Class II Director | Dec 31, 2025 | Award | 22,916 | — | — | 118.3K | Form 4 ↗ |
Chan Nelson Class I Director | Dec 31, 2025 | Award | 22,916 | — | — | 101.5K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
GCT Semiconductor Holding, Inc. (GCTS) is primarily owned by institutional investors, who hold approximately 6.3% of total shares outstanding. Company insiders own approximately 22.93%, while retail and public investors account for the remaining 70.81%.
The largest institutional shareholder of GCT Semiconductor Holding, Inc. is VANGUARD GROUP INC, holding approximately 881,941 shares — equal to 1.93% of outstanding shares — as of March 31, 2025.
A total of 42 institutional investors currently hold GCTS stock, with a combined institutional value of approximately $5,874,695 as of the most recent 13F filing period.
Frequently asked questions
GCTS ownershipGCT Semiconductor Holding, Inc. (GCTS) is primarily owned by institutional investors, who hold approximately 6.3% of shares. The largest shareholder is VANGUARD GROUP INC with a 1.93% stake. Company insiders hold 22.93%. Data sourced from SEC Form 13F as of March 31, 2025.