GCT Semiconductor Holding, Inc. SEC filings GCTS
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 |
| 8-K |
Current report
Shareholder vote results
|
Sep 18, 2026 | Sep 17, 2026 |
| 8-K |
Current report
Officer or director change
|
Sep 15, 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 | Sep 14, 2026 | Sep 10, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2026 | Aug 10, 2026 |
| 10-Q | Quarterly report | Aug 10, 2026 | Jun 30, 2026 |
| ARS | Annual report to shareholders | Aug 3, 2026 | Jul 28, 2026 |
| DEFA14A | Additional proxy material | Aug 3, 2026 | — |
| DEF 14A | Proxy statement | Aug 3, 2026 | Sep 17, 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 |
| 8-K/A |
Amended current report
Other events
|
Jun 18, 2026 | Jun 18, 2026 |
| 8-K |
Current report
Results of operations
|
Jun 18, 2026 | Jun 18, 2026 |
| 424B5 | Prospectus supplement | Jun 18, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| 10-Q | Quarterly report | May 12, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 12, 2026 | May 12, 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 |
| 424B5 | Prospectus supplement | Mar 30, 2026 | — |
| 10-K | Annual report | Mar 25, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 25, 2026 | Mar 25, 2026 |
| 4 | Insider transaction | Mar 6, 2026 | Feb 23, 2026 |
| 424B5 | Prospectus supplement | Mar 2, 2026 | — |
| 8-K |
Current report
Material agreement
|
Feb 25, 2026 | Feb 24, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 13, 2026 | — |
| 8-K |
Current report
Other events
|
Jan 29, 2026 | Jan 29, 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 |
| 424B5 | Prospectus supplement | Dec 15, 2025 | — |
| 8-K |
Current report
Material agreement, New debt
|
Dec 15, 2025 | Dec 15, 2025 |
| 4 | Insider transaction | Nov 28, 2025 | Nov 25, 2025 |
| 4 | Insider transaction | Nov 24, 2025 | Nov 20, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2025 | Nov 12, 2025 |
| 10-Q | Quarterly report | Nov 12, 2025 | Sep 30, 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 |
| 8-K |
Current report
Shareholder vote results
|
Sep 19, 2025 | Sep 18, 2025 |
| 4 | Insider transaction | Sep 16, 2025 | Sep 12, 2025 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Sep 11, 2025 | Sep 10, 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 |
| 10-Q | Quarterly report | Aug 12, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2025 | Aug 12, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 12, 2025 | — |
| ARS | Annual report to shareholders | Aug 4, 2025 | Jul 27, 2025 |
| DEFA14A | Additional proxy material | Aug 4, 2025 | — |
| DEF 14A | Proxy statement | Aug 4, 2025 | Sep 18, 2025 |
| PRE 14A | Preliminary proxy statement | Jul 25, 2025 | Sep 18, 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 |
| EFFECT | Filing | Jun 10, 2025 | — |
| EFFECT | Filing | Jun 6, 2025 | — |
| POS AM | Filing | Jun 6, 2025 | — |
| 8-K |
Current report
Other events
|
Jun 6, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 6, 2025 | Jun 4, 2025 |
| CORRESP | Letter to the SEC | Jun 4, 2025 | — |
| CORRESP | Letter to the SEC | May 30, 2025 | — |
| S-3/A | Form s-3/a | May 30, 2025 | — |
| 4 | Insider transaction | May 27, 2025 | May 23, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 20, 2025 |
| UPLOAD | Letter from the SEC | May 20, 2025 | — |
| 8-K |
Current report
Material agreement, Other events
|
May 16, 2025 | May 15, 2025 |
| 424B5 | Prospectus supplement | May 16, 2025 | — |
| 8-K |
Current report
Results of operations
|
May 14, 2025 | May 14, 2025 |
| 10-Q | Quarterly report | May 14, 2025 | Mar 31, 2025 |
| CORRESP | Letter to the SEC | May 13, 2025 | — |
| S-3/A | Form s-3/a | May 13, 2025 | — |
| EFFECT | Filing | May 2, 2025 | — |
| UPLOAD | Letter from the SEC | May 1, 2025 | — |
| EFFECT | Filing | Apr 30, 2025 | — |
| POS AM | Filing | Apr 30, 2025 | — |
| CORRESP | Letter to the SEC | Apr 28, 2025 | — |
| UPLOAD | Letter from the SEC | Apr 28, 2025 | — |
| S-3 | Shelf registration | Apr 23, 2025 | — |
| S-3 | Shelf registration | Apr 23, 2025 | — |
| 4 | Insider transaction | Apr 23, 2025 | Mar 26, 2025 |
| 8-K |
Current report
Other events
|
Apr 17, 2025 | Apr 16, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 15, 2025 | — |
| 4/A | Filing | Apr 14, 2025 | Mar 26, 2024 |
| EFFECT | Filing | Apr 9, 2025 | — |
| 4/A | Filing | Apr 7, 2025 | Mar 26, 2024 |
| CORRESP | Letter to the SEC | Apr 7, 2025 | — |
| UPLOAD | Letter from the SEC | Apr 4, 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 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| S-3 | Shelf registration | Apr 1, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 28, 2025 | — |
| 4 | Insider transaction | Mar 28, 2025 | Mar 26, 2025 |
| 424B3 | Prospectus | Mar 26, 2025 | — |
| 424B3 | Prospectus | Mar 26, 2025 | — |
| 10-K | Annual report | Mar 25, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 25, 2025 | Mar 25, 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 | — |
| 8-K |
Current report
Material agreement
|
Jan 29, 2025 | Jan 24, 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 |
| 424B3 | Prospectus | Nov 18, 2024 | — |
| 424B3 | Prospectus | Nov 15, 2024 | — |
| 424B3 | Prospectus | Nov 15, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| 10-Q | Quarterly report | Nov 14, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 14, 2024 | 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 | — |
| 424B3 | Prospectus | Sep 27, 2024 | — |
| 424B3 | Prospectus | Sep 27, 2024 | — |
| 4 | Insider transaction | Sep 27, 2024 | Sep 26, 2024 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Sep 26, 2024 | Sep 26, 2024 |
| 424B3 | Prospectus | Aug 27, 2024 | — |
| 424B3 | Prospectus | Aug 27, 2024 | — |
| 8-K |
Current report
Officer or director change
|
Aug 26, 2024 | Aug 21, 2024 |
| 4 | Insider transaction | Aug 23, 2024 | Aug 21, 2024 |
| 424B3 | Prospectus | Aug 16, 2024 | — |
| 424B3 | Prospectus | Aug 16, 2024 | — |
| 10-Q | Quarterly report | Aug 14, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 14, 2024 | Aug 14, 2024 |
| 424B3 | Prospectus | Jul 10, 2024 | — |
| 8-K |
Current report
Other events
|
Jul 10, 2024 | Jul 10, 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 | — |
| S-8 | Employee stock plan registration | Jun 7, 2024 | — |
| EFFECT | Filing | Jun 6, 2024 | — |
| CORRESP | Letter to the SEC | Jun 4, 2024 | — |
| 424B3 | Prospectus | Jun 4, 2024 | — |
| EFFECT | Filing | Jun 3, 2024 | — |
| CORRESP | Letter to the SEC | May 31, 2024 | — |
| UPLOAD | Letter from the SEC | May 28, 2024 | — |
| CORRESP | Letter to the SEC | May 23, 2024 | — |
| S-1/A | Amended registration statement | May 23, 2024 | — |
| UPLOAD | Letter from the SEC | May 22, 2024 | — |
| S-1 | Registration statement | May 22, 2024 | — |
| CORRESP | Letter to the SEC | May 17, 2024 | — |
| S-1/A | Amended registration statement | May 17, 2024 | — |
| 10-Q | Quarterly report | May 14, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 14, 2024 | May 14, 2024 |
| UPLOAD | Letter from the SEC | May 6, 2024 | — |
| 4/A | Filing | May 3, 2024 | Mar 26, 2024 |
| 4/A | Filing | May 3, 2024 | Mar 26, 2024 |
Showing 200 filings, the most recent 200. 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.