GCT Semiconductor Holding, Inc. SEC filings GCTS-WT
GCT Semiconductor Holding, Inc. has 336 filings in SEC EDGAR's recent list, going back to Mar 26, 2021. Its latest annual report, Form ARS, was filed on Aug 3, 2026 for the period ended Jul 28, 2026. The latest quarterly report (Form 10-Q) was filed on Aug 10, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Sep 18, 2026 (shareholder vote results). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Sep 14, 2026 | Sep 10, 2026 |
| 4 | Insider transaction | Sep 14, 2026 | Sep 10, 2026 |
| 4 | Insider transaction | Sep 14, 2026 | Sep 10, 2026 |
| 4 | Insider transaction | Sep 14, 2026 | Sep 10, 2026 |
| 4 | Insider transaction | Jul 7, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Mar 6, 2026 | Feb 23, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 13, 2026 | — |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Nov 28, 2025 | Nov 25, 2025 |
| 4 | Insider transaction | Nov 24, 2025 | Nov 20, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Sep 30, 2025 | Sep 26, 2025 |
| 4 | Insider transaction | Sep 23, 2025 | Sep 19, 2025 |
| 4 | Insider transaction | Sep 23, 2025 | Sep 19, 2025 |
| 4 | Insider transaction | Sep 23, 2025 | Sep 19, 2025 |
| 4 | Insider transaction | Sep 23, 2025 | Sep 19, 2025 |
| 4 | Insider transaction | Sep 16, 2025 | Sep 12, 2025 |
| 4 | Insider transaction | Sep 8, 2025 | Sep 4, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 22, 2025 | — |
| 4 | Insider transaction | Aug 19, 2025 | Aug 15, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 12, 2025 | — |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 6, 2025 | Jun 4, 2025 |
| 4 | Insider transaction | May 27, 2025 | May 23, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 20, 2025 |
| 4 | Insider transaction | Apr 23, 2025 | Mar 26, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 15, 2025 | — |
| 4/A | Filing | Apr 14, 2025 | Mar 26, 2024 |
| 4/A | Filing | Apr 7, 2025 | Mar 26, 2024 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 28, 2025 | — |
| 4 | Insider transaction | Mar 28, 2025 | Mar 26, 2025 |
| 4/A | Filing | Feb 27, 2025 | Mar 26, 2024 |
| 4/A | Filing | Feb 27, 2025 | Mar 26, 2024 |
| 4 | Insider transaction | Feb 21, 2025 | Jan 13, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 14, 2025 | — |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Dec 16, 2024 | Dec 13, 2024 |
| 4 | Insider transaction | Nov 21, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Nov 21, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Nov 21, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Nov 21, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Nov 21, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Nov 21, 2024 | Sep 30, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| 4 | Insider transaction | Sep 27, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Aug 23, 2024 | Aug 21, 2024 |
| 4 | Insider transaction | Jul 5, 2024 | Jun 30, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jun 30, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jun 30, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jun 30, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jun 30, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jun 30, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jun 28, 2024 | — |
| 4/A | Filing | May 3, 2024 | Mar 26, 2024 |
| 4/A | Filing | May 3, 2024 | Mar 26, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | May 3, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 29, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Apr 5, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Apr 3, 2024 | — |
| 4 | Insider transaction | Mar 28, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 28, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| 3 | Initial insider ownership | Mar 27, 2024 | Mar 26, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Mar 11, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 7, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Jan 31, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 19, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 9, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Dec 28, 2023 | — |
| 4 | Insider transaction | Nov 17, 2023 | Nov 16, 2023 |
| 4 | Insider transaction | Nov 17, 2023 | Nov 16, 2023 |
| 4 | Insider transaction | Nov 17, 2023 | Nov 16, 2023 |
| 4 | Insider transaction | Nov 17, 2023 | Nov 16, 2023 |
| SC 13G | Ownership over 5% (passive) | Nov 9, 2023 | — |
| SC 13G | Ownership over 5% (passive) | May 16, 2023 | — |
| SC 13G | Ownership over 5% (passive) | May 9, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 31, 2023 | — |
| SC 13G | Ownership over 5% (passive) | May 27, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 3, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Nov 18, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Nov 17, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Nov 16, 2021 | — |
| 3 | Initial insider ownership | Nov 3, 2021 | Nov 3, 2021 |
| 3 | Initial insider ownership | Nov 3, 2021 | Nov 3, 2021 |
| 3 | Initial insider ownership | Nov 3, 2021 | Nov 3, 2021 |
| 3 | Initial insider ownership | Nov 3, 2021 | Nov 3, 2021 |
| 3 | Initial insider ownership | Nov 3, 2021 | Nov 3, 2021 |
| 3 | Initial insider ownership | Nov 3, 2021 | Nov 3, 2021 |
| 3 | Initial insider ownership | Nov 3, 2021 | Nov 3, 2021 |
Showing 168 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Semiconductors & Related Devices (SIC 3674)
- Listed as
- GCTS (NYSE), GCTS-WT (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- San Jose, CA
- SEC filer status
- , Emerging growth company
- SEC CIK
- 1851961
- Former names
- Concord Acquisition Corp III (until Mar 28, 2024)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.