C4 Therapeutics, Inc. SEC filings CCCC
C4 Therapeutics, Inc. has 546 filings in SEC EDGAR's recent list, going back to Jan 11, 2016. Its latest annual report, Form ARS, was filed on Apr 29, 2026 for the period ended Apr 29, 2026. The latest quarterly report (Form 10-Q) was filed on Aug 11, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Sep 25, 2026 (regulation fd disclosure, other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Oct 2, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Sep 21, 2026 | Sep 18, 2026 |
| 144 | Notice of proposed sale | Aug 14, 2026 | — |
| 144 | Notice of proposed sale | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| 144 | Notice of proposed sale | Aug 13, 2026 | — |
| 144 | Notice of proposed sale | Aug 12, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 12, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 27, 2026 | — |
| 4 | Insider transaction | Jul 13, 2026 | Jul 10, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 4, 2026 | Jun 1, 2026 |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 19, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 22, 2026 | — |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 144 | Notice of proposed sale | Mar 9, 2026 | — |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 11, 2026 | — |
| 4 | Insider transaction | Jan 16, 2026 | Jan 16, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 2, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 13, 2025 | — |
| 4 | Insider transaction | Oct 30, 2025 | Oct 28, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 24, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 24, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 20, 2025 | — |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Sep 19, 2025 | Sep 18, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 7, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 16, 2025 | — |
| 4/A | Form 4/a | Jul 15, 2025 | Jul 10, 2025 |
| 4 | Insider transaction | Jul 14, 2025 | Jul 10, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 18, 2025 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 18, 2025 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 18, 2025 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 18, 2025 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 18, 2025 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 18, 2025 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 18, 2025 |
| 4 | Insider transaction | Jun 20, 2025 | Jun 18, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 7, 2025 | — |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 14, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 13, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 13, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 14, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 13, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 13, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 14, 2025 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 14, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 3, 2025 | — |
| 4 | Insider transaction | Jan 3, 2025 | Jan 2, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 2, 2025 |
| 4 | Insider transaction | Nov 21, 2024 | Nov 19, 2024 |
| 3 | Initial insider ownership | Nov 21, 2024 | Nov 19, 2024 |
| 144 | Notice of proposed sale | Nov 18, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| 4 | Insider transaction | Nov 12, 2024 | Nov 7, 2024 |
| 4 | Insider transaction | Nov 12, 2024 | Nov 7, 2024 |
| 4 | Insider transaction | Nov 12, 2024 | Nov 7, 2024 |
| 4 | Insider transaction | Nov 12, 2024 | Nov 7, 2024 |
| 4 | Insider transaction | Nov 12, 2024 | Nov 7, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 8, 2024 | — |
| 4 | Insider transaction | Oct 29, 2024 | Oct 28, 2024 |
| 3 | Initial insider ownership | Oct 29, 2024 | Oct 28, 2024 |
| SC 13G | Ownership over 5% (passive) | Oct 22, 2024 | — |
| 144 | Notice of proposed sale | Oct 18, 2024 | — |
| 144 | Notice of proposed sale | Oct 11, 2024 | — |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Sep 20, 2024 | Sep 18, 2024 |
| 4 | Insider transaction | Sep 17, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 17, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 17, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 17, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 17, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 17, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 3, 2024 | Aug 29, 2024 |
| 3 | Initial insider ownership | Sep 3, 2024 | Aug 29, 2024 |
| 4 | Insider transaction | Jul 11, 2024 | Jul 10, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 10, 2024 | — |
| 4 | Insider transaction | Jul 2, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jun 21, 2024 | Jun 20, 2024 |
| 4 | Insider transaction | Jun 21, 2024 | Jun 20, 2024 |
| 4 | Insider transaction | Jun 21, 2024 | Jun 20, 2024 |
| 4 | Insider transaction | Jun 21, 2024 | Jun 20, 2024 |
| 4 | Insider transaction | Jun 21, 2024 | Jun 20, 2024 |
| 4 | Insider transaction | Jun 21, 2024 | Jun 20, 2024 |
| 4 | Insider transaction | Jun 21, 2024 | Jun 20, 2024 |
| 4 | Insider transaction | Jun 11, 2024 | Jun 7, 2024 |
| 3 | Initial insider ownership | Jun 11, 2024 | Jun 7, 2024 |
| 4 | Insider transaction | Apr 10, 2024 | Feb 14, 2024 |
| SC 13G | Ownership over 5% (passive) | Apr 10, 2024 | — |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 7, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 7, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 7, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 7, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 7, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Mar 8, 2024 | — |
| 4 | Insider transaction | Feb 15, 2024 | Feb 15, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 14, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 14, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 13, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 13, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 13, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 13, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 13, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 5, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 2, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Jan 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Jan 4, 2024 | — |
| 4 | Insider transaction | Jan 3, 2024 | Jan 2, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 2, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 2, 2024 |
| SC 13G | Ownership over 5% (passive) | Dec 26, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Dec 22, 2023 | — |
| 4 | Insider transaction | Nov 20, 2023 | Nov 16, 2023 |
| 3 | Initial insider ownership | Nov 20, 2023 | Nov 16, 2023 |
| SC 13G | Ownership over 5% (passive) | Nov 13, 2023 | — |
| 4 | Insider transaction | Oct 3, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Oct 3, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Oct 3, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Sep 19, 2023 | Sep 18, 2023 |
| 4 | Insider transaction | Sep 19, 2023 | Sep 18, 2023 |
| 4 | Insider transaction | Sep 19, 2023 | Sep 18, 2023 |
| 4 | Insider transaction | Sep 19, 2023 | Sep 18, 2023 |
| 4 | Insider transaction | Sep 19, 2023 | Sep 18, 2023 |
| 4 | Insider transaction | Sep 19, 2023 | Sep 18, 2023 |
| 3 | Initial insider ownership | Sep 19, 2023 | Sep 18, 2023 |
| 3 | Initial insider ownership | Sep 19, 2023 | Sep 18, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| SC 13G | Ownership over 5% (passive) | Jul 25, 2023 | — |
| 4 | Insider transaction | Jul 12, 2023 | Jul 10, 2023 |
| 3 | Initial insider ownership | Jul 12, 2023 | Jul 10, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 7, 2023 | — |
| 4 | Insider transaction | Jul 5, 2023 | Jul 3, 2023 |
| 4 | Insider transaction | Jul 5, 2023 | Jul 3, 2023 |
| 4 | Insider transaction | Jul 5, 2023 | Jul 3, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 15, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 15, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 15, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 15, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 15, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 15, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 15, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Jun 12, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Apr 14, 2023 | — |
| 4 | Insider transaction | Apr 4, 2023 | Apr 3, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Apr 3, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Apr 3, 2023 |
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
- Biological Products, (No Diagnostic Substances) (SIC 2836)
- Listed as
- CCCC (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Watertown, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1662579
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All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.