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. 88.6% of the shares are freely tradable; institutional investors hold 4.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Capital Management, LLC | 3.26 | 2,999,130 | +71.9 | 06/30/2026 |
| Renaissance Technologies Corp | 1.84 | 1,695,300 | +0.0 | 06/30/2026 |
| Marshall Wace Asset Management Ltd | 1.41 | 1,296,433 | +0.0 | 06/30/2026 |
| BlackRock Inc | 1.39 | 1,281,164 | +114.3 | 06/30/2026 |
| Tudor Investment Corp Et AL | 0.89 | 818,485 | +0.0 | 06/30/2026 |
| Geode Capital Management, LLC | 0.83 | 767,459 | +61.8 | 06/30/2026 |
| UBS Group AG | 0.70 | 646,238 | +1,629.6 | 06/30/2026 |
| Gm Advisory Group Inc | 0.47 | 434,456 | +166.7 | 03/31/2026 |
| Vanguard Fiduciary Trust Co | 0.45 | 416,917 | +69.3 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.85 | 2,616,975 | +22.0 | 09/30/2026 |
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 |
|---|---|---|---|---|---|
| Lee Kyeongho | Director | 1,109,093 | 1,109,093 $ | Sep 30, 2026 | direct |
| Shin Hyunsoo | Director | 827,039 | 827,039 $ | Sep 30, 2026 | direct |
| Kim Jeong-Min | Chief Technology Officer | 402,701 | 402,701 $ | Sep 10, 2026 | direct |
| Schlaefer John | President, CEO & Class III Dir | 352,728 | 352,728 $ | Sep 10, 2026 | direct |
| Cheng Edmond | Chief Financial Officer | 296,000 | 296,000 $ | Sep 10, 2026 | direct |
| Sum Alex | Sr. VP of Sales and Marketing | 258,743 | 258,743 $ | Sep 10, 2026 | direct |
| Barker Robert | Director | 164,681 | 164,681 $ | Sep 30, 2026 | direct |
| Tuder Jeffrey | Director | 164,161 | 164,161 $ | Sep 30, 2026 | direct |
| Chan Nelson | Director | 147,872 | 147,872 $ | Sep 30, 2026 | direct |
| Chun Kukjin | Director | 111,607 | 111,607 $ | Sep 30, 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 30, 2026 | Lee Kyeongho | Director | Other | 12,971 | 0.00 | – |
| Sep 30, 2026 | Barker Robert | Director | Other | 12,971 | 0.00 | – |
| Sep 30, 2026 | Tuder Jeffrey | Director | Other | 12,971 | 0.00 | – |
| Sep 30, 2026 | Chan Nelson | Director | Other | 12,971 | 0.00 | – |
| Sep 30, 2026 | Chun Kukjin | Director | Other | 12,971 | 0.00 | – |
| Sep 30, 2026 | Shin Hyunsoo | Director | Other | 12,971 | 0.00 | – |
| 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: November 2, 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.