GCT Semiconductor Holding Inc
Ownership
Ownership Structure
Who owns GCT Semiconductor Holding Inc (GCTS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 88.5% of the shares are freely tradable; institutional investors hold 4.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Capital Management, LLC | 1.90 | 1,744,949 | +0.0 | 03/31/2026 |
| Tudor Investment Corp Et AL | 0.89 | 818,485 | +0.0 | 06/30/2026 |
| BlackRock Inc | 0.65 | 597,947 | +3.0 | 03/31/2026 |
| Geode Capital Management, LLC | 0.52 | 474,346 | +14.3 | 03/31/2026 |
| Gm Advisory Group Inc | 0.47 | 434,456 | +166.7 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.33 | 2,145,646 | +0.0 | 07/31/2026 |
| Vanguard Institutional Extnd Mkt Idx Tr | 0.87 | 800,086 | +0.0 | 07/31/2026 |
| iShares Core S&P Total US Stock Mkt ETF | 0.42 | 382,875 | -0.6 | 08/31/2026 |
| Fidelity Extended Market Index | 0.35 | 320,511 | -10.4 | 07/31/2026 |
| IMC US Ultra Micro Cap | 0.31 | 285,802 | +0.0 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Kim Jeong-Min | Chief Technology Officer | 402,701 | 845,672 $ | Sep 10, 2026 | direct |
| Schlaefer John | President, CEO & Class III Dir | 352,728 | 740,729 $ | Sep 10, 2026 | direct |
| Cheng Edmond | Chief Financial Officer | 296,000 | 621,600 $ | Sep 10, 2026 | direct |
| Sum Alex | Sr. VP of Sales and Marketing | 258,743 | 543,360 $ | Sep 10, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 10, 2026 | Sum Alex | Sr. VP of Sales and Marketing | Other | 75,000 | 0.00 | – |
| Sep 10, 2026 | Schlaefer John | President, CEO & Class III Dir | Other | 150,000 | 0.00 | – |
| Sep 10, 2026 | Kim Jeong-Min | Chief Technology Officer | Other | 100,000 | 0.00 | – |
| Sep 10, 2026 | Cheng Edmond | Chief Financial Officer | Other | 145,000 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.