GCT Semiconductor Holding, Inc. (GCTS) Ownership
GCTS ownership summary
as of October 18, 2026- Institutions
- 14.4% of shares outstanding
- Insiders
- 12.70% of shares outstanding
- Shares outstanding
- 92.0M
- Float
- 81.5M shares available to trade
- Short interest
- 12.09% 10.8M shares short
- Days to cover
- 7.17 short interest up 4.3% vs prior month
- Institutions 14.44%
- Insiders 12.70%
- Other investors 72.86%
GCTS top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard Capital Management, LLC | 3.26% | 3.0M | $4.8M | +1.3M (+71.9%) | June 30, 2026 |
| 2 | Renaissance Technologies Corp | 1.84% | 1.7M | $2.7M | +1.7M (0.0%) | June 30, 2026 |
| 3 | Marshall Wace Asset Management Ltd | 1.41% | 1.3M | $2.1M | +1.3M (0.0%) | June 30, 2026 |
| 4 | BlackRock Inc | 1.39% | 1.3M | $2.0M | +683,217 (+114.3%) | June 30, 2026 |
| 5 | Tudor Investment Corp Et AL | 0.89% | 818K | $1.3M | +818,485 (0.0%) | June 30, 2026 |
| 6 | Geode Capital Management, LLC | 0.83% | 767K | $1.2M | +293,113 (+61.8%) | June 30, 2026 |
| 7 | UBS Group AG | 0.70% | 646K | $1.0M | +608,875 (+1,629.6%) | June 30, 2026 |
| 8 | Gm Advisory Group Inc | 0.47% | 434K | $690,785 | +271,569 (+166.7%) | March 31, 2026 |
| 9 | Vanguard Fiduciary Trust Co | 0.45% | 417K | $662,898 | +170,673 (+69.3%) | June 30, 2026 |
| 10 | State Street Corp | 0.38% | 353K | $561,412 | +112,500 (+46.8%) | June 30, 2026 |
| 11 | The Informed Momentum Company (formerly EAM Investors) | 0.26% | 241K | $383,581 | +241,246 (0.0%) | June 30, 2026 |
| 12 | XTX Topco Ltd | 0.18% | 165K | $261,900 | +139,038 (+541.4%) | June 30, 2026 |
| 13 | Northern Trust Corp | 0.17% | 155K | $247,000 | +92,645 (+147.8%) | June 30, 2026 |
| 14 | Robertson Stephens Wealth Management, LLC | 0.16% | 150K | $238,500 | +150,000 (0.0%) | June 30, 2026 |
| 15 | SEI Investments Co | 0.16% | 143K | $227,213 | +142,901 (0.0%) | June 30, 2026 |
| 16 | Jane Street Group LLC | 0.14% | 133K | $211,600 | +133,082 (0.0%) | June 30, 2026 |
| 17 | Team Hewins LLC | 0.14% | 126K | $199,768 | — | June 30, 2026 |
| 18 | The Goldman Sachs Group Inc | 0.12% | 113K | $179,411 | +45,324 (+67.1%) | June 30, 2026 |
| 19 | ExodusPoint Capital Management, LP | 0.10% | 89K | $140,777 | +88,539 (0.0%) | June 30, 2026 |
| 20 | Citadel Advisors Llc | 0.08% | 77K | $122,697 | +77,168 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 19 holders added 8.3M shares and 0 cut 0.
GCTS top mutual fund and ETF holders
13 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.33% | 2.1M | $3.4M | — | August 31, 2026 |
| 2 | Fidelity Extended Market Index | 0.37% | 342K | $544,273 | +21,799 (+6.8%) | August 31, 2026 |
| 3 | iShares Micro-Cap ETF | 0.28% | 258K | $409,934 | −1,778 (−0.7%) | September 30, 2026 |
| 4 | Fidelity Total Market Index | 0.14% | 125K | $199,435 | — | August 31, 2026 |
| 5 | Fidelity Series Total Market Index | 0.13% | 116K | $184,907 | — | August 31, 2026 |
| 6 | EA Bridgeway Ultra-Small Company Mkt ETF | 0.12% | 109K | $173,275 | — | September 30, 2026 |
| 7 | Goldman Sachs Absolute Ret Trckr Instl | 0.11% | 103K | $163,482 | +55,477 (+117.2%) | June 30, 2026 |
| 8 | Vanguard MStar Inst Ttl StkMktIdxInstlPl | 0.03% | 30K | $47,322 | — | August 31, 2026 |
| 9 | Vanguard U.S. Eq Idx £ Acc | 0.03% | 28K | $43,921 | — | August 31, 2026 |
| 10 | Vanguard Balanced Index Inv | 0.03% | 24K | $37,581 | — | August 31, 2026 |
| 11 | 1290 VT Micro Cap K | 0.02% | 14K | $22,731 | — | August 31, 2026 |
| 12 | JHVIT Total Stock Market Index I | <0.01% | 1,700 | $2,703 | +1,700 (0.0%) | August 31, 2026 |
| 13 | iShares Core S&P Total US Stock Mkt ETF | <0.01% | 264 | $420 | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
GCTS insider transactions
latest 7| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-11-25 | Hyunsoo Shin | Buy | $1.28 | 16,725 | $21,408 |
| 2025-11-21 | Hyunsoo Shin | Buy | $1.28 | 3,180 | $4,070 |
| 2025-11-20 | Hyunsoo Shin | Buy | $1.28 | 25,453 | $32,580 |
| 2025-09-12 | Hyunsoo Shin | Buy | $1.51 | 44,067 | $66,541 |
| 2025-06-10 | Hyunsoo Shin | Buy | $1.18 | 85,000 | $100,300 |
| 2025-05-23 | Hyunsoo Shin | Buy | $1.04 | 77,000 | $80,080 |
| 2025-05-20 | Hyunsoo Shin | Buy | $1.18 | 86,000 | $101,480 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
GCTS shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns GCTS
Institutional investors own 14.4% of GCT Semiconductor's shares and insiders 12.70%. The largest holder is Vanguard Capital Management, LLC with 3.26% of the shares (3.0M), as of June 30, 2026. Among the top 20 institutions, 19 added shares and 0 reduced their stake in the latest filings. Short interest is 12.09% of the float, or 7.17 days of average trading volume. The share count rose 22.6% since 2021.
Related: GCTS analyst forecast, GCTS key metrics. See the GCTS stock overview for the latest quote and news.
GCTS ownership FAQ
Who owns the most GCT Semiconductor stock?
The largest shareholders of GCT Semiconductor are Vanguard Capital Management, LLC (3.26%), Renaissance Technologies Corp (1.84%), Marshall Wace Asset Management Ltd (1.41%), BlackRock Inc (1.39%), Tudor Investment Corp Et AL (0.89%).
What percentage of GCT Semiconductor is owned by institutions?
Institutions hold 14.4% of GCT Semiconductor's shares outstanding; insiders hold 12.70%.
Which funds own GCT Semiconductor?
The largest fund holders of GCT Semiconductor are Vanguard MStar Total Stk Mkt Idx Invest (2.33%), Fidelity Extended Market Index (0.37%), iShares Micro-Cap ETF (0.28%), Fidelity Total Market Index (0.14%), Fidelity Series Total Market Index (0.13%).
What is GCT Semiconductor's short interest?
10.8M shares of GCT Semiconductor were sold short, 12.09% of the float; at the average daily volume it would take 7.17 days to cover.
Are insiders buying or selling GCT Semiconductor?
Of the latest 7 reported insider transactions in GCT Semiconductor (since May 20, 2025), 7 were purchases and 0 were sales.
How many shares of GCT Semiconductor are outstanding?
GCT Semiconductor has 92.0M shares outstanding, of which 81.5M are in the public float.