GCT Semiconductor
Designs and sells wireless communications semiconductors for 5G, 4G, and cellular IoT.
$1.90
After-hours close+0.04 (+2.15%)
At close$1.86(−2.62%)
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Breakdown13F · Form 4
Institutions 13.82%12.57M sharesInsiders 3.61%3.29M sharesOther 82.57%75.11M shares
Shares outstanding 90.96M · Float 72.68M · 79.9% free float
Institutions13F, as of Jun 30, 2026
58 holders · 12.57M shares · 28 new positions · 47 increased · 2 reduced · 8 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Vanguard Capital Management LLC | 3.00M | 3.30% | +1.25M | Aug 13, 2026 |
| Renaissance Technologies LLC | 1.70M | 1.86% | +1.70Mnew | Aug 13, 2026 |
| Marshall Wace, LLP | 1.30M | 1.43% | +1.30Mnew | Aug 13, 2026 |
| BlackRock, Inc. | 1.28M | 1.41% | +683.2K | Aug 7, 2026 |
| Tudor Investment Corp et al | 818.5K | 0.90% | +818.5Knew | Aug 14, 2026 |
| Geode Capital Management, LLC | 767.5K | 0.84% | +293.1K | Aug 12, 2026 |
| UBS Group AG | 646.2K | 0.71% | +608.9K | Aug 13, 2026 |
| Vanguard Fiduciary Trust Co | 416.9K | 0.46% | +170.7K | Aug 13, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| SUNP Corp | 5.20% | 2.91M | 13G | Aug 22, 2025 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Kyeongho Lee | director, other: Chairman & Class III Director | 1.10M | 1.21% | Jul 2, 2026 |
| Hyunsoo Shin | director, other: Class II Director | 814.1K | 0.89% | Jul 2, 2026 |
| Concord Sponsor Group III LLC | 10 percent owner | 632.6K | 0.70% | Mar 28, 2025 |
| Jeong-Min Kim | officer: Chief Technology Officer | 302.7K | 0.33% | Sep 23, 2025 |
| John Schlaefer | director, officer: President, CEO & Class III Dir | 202.7K | 0.22% | Sep 30, 2025 |
| Alex Sum | officer: Sr. VP of Sales and Marketing | 183.7K | 0.20% | Sep 23, 2025 |
| Robert Barker | director, other: Class II Director | 151.7K | 0.17% | Jul 2, 2026 |
| Jeffrey Tuder | director, other: Class III Director | 151.2K | 0.17% | Jul 7, 2026 |
| Edmond Cheng | officer: Chief Financial Officer | 151.0K | 0.17% | Sep 23, 2025 |
| Nelson Chan | director, other: Class I Director | 134.9K | 0.15% | Jul 2, 2026 |
2 ten-percent owners hold 8.65M shares by Form 4, outside the officers-and-directors figure above · 1 person has not refiled in the last 18 months (8.2K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Nov 25, 2025 | Hyunsoo Shindirector, other: Class II Director | Purchase | 16,725 | $1.28 | 757,771 |
| Nov 20, 2025 | Hyunsoo Shindirector, other: Class II Director | Purchase | 25,453 | $1.28 | 737,866 |
| Nov 21, 2025 | Hyunsoo Shindirector, other: Class II Director | Purchase | 3,180 | $1.28 | 741,046 |
| Sep 12, 2025 | Hyunsoo Shindirector, other: Class II Director | Purchase | 44,067 | $1.51 | 694,321 |
| Sep 4, 2025 | Hyunsoo Shindirector, other: Class II Director | Purchase | 8,250 | $1.26 | 639,954 |
| Sep 5, 2025 | Hyunsoo Shindirector, other: Class II Director | Purchase | 10,300 | $1.30 | 650,254 |
CongressHouse and Senate disclosures
Not reported.