GCTSNYSESemiconductors & Related DevicesFiscal year ends December 31Also trades as GCTS.WT
GCT Semiconductor Holding, Inc.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 10, 2026
$1.51−0.08 (-5.03%)
Close on Oct 19, 2026
- Market cap
- $124.66M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
13M
Shares held, 13F filers
Institutional holders
55
29 new, 6 sold out
Net institutional buying
9M
In Q2 2026
Insider trades, 12 months
3 buys · 0 sales
Net bought $58.06K
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Anapass, Inc. | 8,213,213 | 17.60% | 13G (passive) amendment | Mar 26, 2024 |
| Rivernorth Capital Management, LLC | 375,000 | 9.52% | 13G (passive) | Dec 31, 2023 |
| Cowen and Company, LLC | 3,743,950 | 7.30% | 13G (passive) | Sep 30, 2024 |
| Mizuho Financial Group, Inc. | 308,406 | 7.83% | 13G (passive) | Dec 31, 2023 |
| SUNP Corp | 2,910,870 | 5.20% | 13G (passive) amendment | Jun 30, 2025 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of GCTS | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 2,999,130 | – | $8.91M | +1,254,181 | 0.00% |
| Renaissance Technologies LLC | 1,695,300 | – | $5.04M | New | 0.01% |
| Marshall Wace, Llp | 1,296,433 | – | $3.85M | New | 0.00% |
| BlackRock, Inc. | 1,281,164 | – | $3.81M | +683,217 | 0.00% |
| Tudor Investment Corp Et Al | 818,485 | – | $2.43M | New | 0.00% |
| Geode Capital Management, LLC | 767,459 | – | $2.28M | +293,113 | 0.00% |
| UBS Group AG | 646,238 | – | $1.92M | +608,875 | 0.00% |
| Vanguard Fiduciary Trust Co | 416,917 | – | $1.24M | +170,673 | 0.00% |
| State Street Corp | 353,089 | – | $1.05M | +112,500 | 0.00% |
| EAM Investors, LLC | 241,246 | – | $716.50K | New | 0.06% |
| XTX Topco Ltd | 164,717 | – | $489.21K | +139,038 | 0.01% |
| Northern Trust Corp | 155,346 | – | $461.38K | +92,645 | 0.00% |
| Robertson Stephens Wealth Management, LLC | 150,000 | – | $445.50K | New | 0.01% |
| Sei Investments Co | 142,901 | – | $424.42K | New | 0.00% |
| Jane Street Group, LLC | 133,082 | – | $395.25K | New | 0.00% |
| Team Hewins, LLC | 125,640 | – | $373.15K | – | 0.10% |
| Goldman Sachs Group Inc | 112,837 | – | $335.13K | +45,324 | 0.00% |
| ExodusPoint Capital Management, LP | 88,539 | – | $262.96K | New | 0.00% |
| Citadel Advisors LLC | 77,168 | – | $229.19K | New | 0.00% |
| Bridgeway Capital Management, LLC | 75,000 | – | $222.75K | – | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|
| Q2 2026 | 55 | 13M | 29 / 19 | 2 / 6 | 9M | 0M |
| Q1 2026 | 34 | 4M | 14 / 7 | 3 / 3 | 3M | 0M |
| Q4 2025 | 24 | 4M | 3 / 10 | 6 / 8 | 1M | 1M |
| Q3 2025 | 29 | 4M | 8 / 4 | 12 / 10 | 1M | 1M |
| Q2 2025 | 31 | 4M | 11 / 10 | 9 / 23 | 2M | 1M |
| Q1 2025 | 43 | 4M | 5 / 13 | 14 / 3 | 1M | 0M |
| Q4 2024 | 41 | 3M | 5 / 17 | 6 / 5 | 0M | 0M |
| Q3 2024 | 41 | 3M | 10 / 13 | 9 / 2 | 1M | 0M |
| Q2 2024 | 34 | 3M | 26 / 4 | 3 / 0 | 3M | 0M |
| Q1 2024 | 8 | 0M | 8 / 0 | 0 / 0 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of GCTS | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 2,145,646 | – | $6.37M | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 800,086 | – | $2.38M | 0.00% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 230,798 | – | $777.79K | 0.00% | May 31, 2026 |
| iShares Micro-Cap ETF | 212,062 | – | $629.82K | 0.04% | Jun 30, 2026 |
| Goldman Sachs Absolute Return Tracker Fund | 102,819 | – | $305.37K | 0.00% | Jun 30, 2026 |
| Ultra-Small Company Market Fund | 75,000 | – | $222.75K | 0.15% | Jun 30, 2026 |
| Fidelity Series Total Market Index Fund | 71,017 | – | $239.33K | 0.00% | May 31, 2026 |
| Fidelity Total Market Index Fund | 63,584 | – | $214.28K | 0.00% | May 31, 2026 |
| Vanguard Institutional Total Stock Market Index Fund | 29,762 | – | $88.39K | 0.00% | Jun 30, 2026 |
| Vanguard Balanced Index Fund | 23,636 | – | $70.20K | 0.00% | Jun 30, 2026 |
| 1290 VT Micro Cap Portfolio | 14,296 | – | $42.46K | 0.02% | Jun 30, 2026 |
| Blackstone Alternative Multi-Strategy Fund | -200 | – | -$594 | -0.00% | Jun 30, 2026 |
| U.S. Small Cap Equity Fund | -4,946 | – | -$14.69K | -0.01% | Jun 30, 2026 |
| U.S. Small Cap Equity Fund | -20,547 | – | -$38.22K | -0.00% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | Latest filing |
|---|---|---|---|
| John Schlaefer | President, CEO & Class III Dir, Director | 352,728 | Sep 14, 2026 |
| Edmond Cheng | Chief Financial Officer | 296,000 | Sep 14, 2026 |
| Jeong-Min Kim | Chief Technology Officer | 402,701 | Sep 14, 2026 |
| Alex Sum | Sr. VP of Sales and Marketing | 258,743 | Sep 14, 2026 |
| Jeffrey Tuder | Director | 151,190 | Jul 7, 2026 |
| Nelson Chan | Director | 134,901 | Jul 2, 2026 |
| Hyunsoo Shin | Director | 814,068 | Jul 2, 2026 |
| Kukjin Chun | Director | 98,636 | Jul 2, 2026 |
| Kyeongho Lee | Director | 1,100,272 | Jul 2, 2026 |
| Robert Barker | Director | 151,710 | Jul 2, 2026 |
| Sponsor Group III LLC Concord | 10% owner | 8,590,312 | Mar 28, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Alex Sum Sr. VP of Sales and Marketing | Sep 10, 2026 | Award | +75,000 | – | – | 258,743 |
| Jeong-Min Kim Chief Technology Officer | Sep 10, 2026 | Award | +100,000 | – | – | 402,701 |
| John Schlaefer President, CEO & Class III Dir, Director | Sep 10, 2026 | Award | +150,000 | – | – | 352,728 |
| Edmond Cheng Chief Financial Officer | Sep 10, 2026 | Award | +145,000 | – | – | 296,000 |
| Jeffrey Tuder Director | Jun 30, 2026 | Award | +9,259 | – | – | 151,190 |
| Robert Barker Director | Jun 30, 2026 | Award | +9,259 | – | – | 151,710 |
| Kyeongho Lee Director | Jun 30, 2026 | Award | +9,259 | – | – | 1,096,122 |
| Kukjin Chun Director | Jun 30, 2026 | Award | +9,259 | – | – | 98,636 |
| Hyunsoo Shin Director | Jun 30, 2026 | Award | +9,259 | – | – | 814,068 |
| Nelson Chan Director | Jun 30, 2026 | Award | +9,259 | – | – | 134,901 |
| Kukjin Chun Director | Mar 31, 2026 | Award | +24,122 | – | – | 89,377 |
| Robert Barker Director | Mar 31, 2026 | Award | +24,122 | – | – | 142,451 |
| Nelson Chan Director | Mar 31, 2026 | Award | +24,122 | – | – | 125,642 |
| Kyeongho Lee Director | Mar 31, 2026 | Award | +24,122 | – | – | 1,086,863 |
| Hyunsoo Shin Director | Mar 31, 2026 | Award | +24,122 | – | – | 804,809 |
| Jeffrey Tuder Director | Mar 31, 2026 | Award | +24,122 | – | – | 141,931 |
| Kukjin Chun Director | Feb 23, 2026 | Gift | −40,000 | – | – | 65,255 |
| Jeffrey Tuder Director | Dec 31, 2025 | Award | +22,916 | – | – | 117,809 |
| Robert Barker Director | Dec 31, 2025 | Award | +22,916 | – | – | 118,329 |
| Kukjin Chun Director | Dec 31, 2025 | Award | +22,916 | – | – | 105,255 |
| Hyunsoo Shin Director | Dec 31, 2025 | Award | +22,916 | – | – | 780,687 |
| Kyeongho Lee Director | Dec 31, 2025 | Award | +22,916 | – | – | 1,062,741 |
| Nelson Chan Director | Dec 31, 2025 | Award | +22,916 | – | – | 101,520 |
| Hyunsoo Shin Director | Nov 25, 2025 | Buy | +16,725 | $1.28 | $21.41K | 757,771 |
| Hyunsoo Shin Director | Nov 21, 2025 | Buy | +3,180 | $1.28 | $4.07K | 741,046 |
| Hyunsoo Shin Director | Nov 20, 2025 | Buy | +25,453 | $1.28 | $32.58K | 737,866 |
| Jeffrey Tuder Director | Sep 30, 2025 | Award | +18,092 | – | – | 94,893 |
| Nelson Chan Director | Sep 30, 2025 | Award | +18,092 | – | – | 78,604 |
| Robert Barker Director | Sep 30, 2025 | Award | +18,092 | – | – | 95,413 |
| Kukjin Chun Director | Sep 30, 2025 | Award | +18,092 | – | – | 82,339 |
| Kyeongho Lee Director | Sep 30, 2025 | Award | +18,092 | – | – | 1,039,825 |
| Hyunsoo Shin Director | Sep 30, 2025 | Award | +18,092 | – | – | 712,413 |
| John Schlaefer President, CEO & Class III Dir, Director | Sep 26, 2025 | Other | +555 | – | – | 202,728 |
| Alex Sum Sr. VP of Sales and Marketing | Sep 19, 2025 | Award | +75,000 | – | – | 183,743 |
| John Schlaefer President, CEO & Class III Dir, Director | Sep 19, 2025 | Award | +75,000 | – | – | 202,173 |
| Edmond Cheng Chief Financial Officer | Sep 19, 2025 | Award | +75,000 | – | – | 151,000 |
| Jeong-Min Kim Chief Technology Officer | Sep 19, 2025 | Award | +75,000 | – | – | 302,701 |
| Hyunsoo Shin Director | Sep 12, 2025 | Buy | +44,067 | $1.51 | $66.54K | 694,321 |
| Hyunsoo Shin Director | Sep 5, 2025 | Buy | +10,300 | $1.30 | $13.39K | 650,254 |
| Hyunsoo Shin Director | Sep 4, 2025 | Buy | +8,250 | $1.26 | $10.40K | 639,954 |
| Hyunsoo Shin Director | Aug 15, 2025 | Buy | +121,000 | $1.26 | $152.46K | 631,704 |
| Kyeongho Lee Director | Jun 30, 2025 | Award | +18,456 | – | – | 1,021,733 |
| Kukjin Chun Director | Jun 30, 2025 | Award | +18,456 | – | – | 64,247 |
| Hyunsoo Shin Director | Jun 30, 2025 | Award | +18,456 | – | – | 510,704 |
| Robert Barker Director | Jun 30, 2025 | Award | +18,456 | – | – | 77,321 |
| Nelson Chan Director | Jun 30, 2025 | Award | +18,456 | – | – | 60,512 |
| Jeffrey Tuder Director | Jun 30, 2025 | Award | +18,456 | – | – | 76,801 |
| Hyunsoo Shin Director | Jun 10, 2025 | Buy | +45,000 | $1.16 | $52.20K | 492,248 |
| Hyunsoo Shin Director | Jun 10, 2025 | Buy | +40,000 | $1.20 | $48.00K | 447,248 |
| Hyunsoo Shin Director | Jun 5, 2025 | Buy | +21,300 | $1.02 | $21.73K | 407,248 |
| Hyunsoo Shin Director | Jun 5, 2025 | Buy | +58,700 | $1.03 | $60.46K | 385,948 |
| Hyunsoo Shin Director | Jun 4, 2025 | Buy | +80,000 | $1.02 | $81.60K | 327,248 |
| Hyunsoo Shin Class II Director | May 23, 2025 | Buy | +77,000 | $1.04 | $80.08K | 247,248 |
| Hyunsoo Shin Class II Director | May 20, 2025 | Buy | +86,000 | $1.18 | $101.48K | 170,248 |
| Robert Barker Director | Mar 31, 2025 | Award | +16,768 | – | – | 58,865 |
| Nelson Chan Director | Mar 31, 2025 | Award | +16,768 | – | – | 42,056 |
| Kukjin Chun Director | Mar 31, 2025 | Award | +16,768 | – | – | 45,791 |
| Hyunsoo Shin Director | Mar 31, 2025 | Award | +16,768 | – | – | 84,248 |
| Kyeongho Lee Director | Mar 31, 2025 | Award | +16,768 | – | – | 1,003,277 |
| Jeffrey Tuder Director | Mar 31, 2025 | Award | +16,768 | – | – | 42,056 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.