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 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Sep 25, 2026 | Sep 25, 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 | — |
| 10-Q | Quarterly report | Aug 11, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2026 | Aug 11, 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 |
| 8-K |
Current report
Shareholder vote results
|
Jun 24, 2026 | Jun 24, 2026 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 11, 2026 | Jun 11, 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 | — |
| 8-K |
Current report
Officer or director change
|
May 15, 2026 | May 15, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2026 | — |
| 10-Q | Quarterly report | May 12, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 12, 2026 | May 12, 2026 |
| ARS | Annual report to shareholders | Apr 29, 2026 | Apr 29, 2026 |
| DEFA14A | Additional proxy material | Apr 29, 2026 | — |
| DEF 14A | Proxy statement | Apr 29, 2026 | Apr 29, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 22, 2026 | — |
| 8-K |
Current report
Bylaw or fiscal year change
|
Apr 10, 2026 | Apr 10, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Apr 9, 2026 | Apr 9, 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 | — |
| S-8 | Employee stock plan registration | Feb 26, 2026 | — |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 26, 2026 | Feb 26, 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 14, 2026 | Jan 14, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 2, 2026 |
| EFFECT | Filing | Dec 10, 2025 | — |
| 424B5 | Prospectus supplement | Dec 10, 2025 | — |
| CORRESP | Letter to the SEC | Dec 8, 2025 | — |
| S-3 | Shelf registration | Nov 21, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 13, 2025 | — |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2025 | Nov 6, 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 | — |
| 8-K |
Current report
Material agreement
|
Oct 16, 2025 | Oct 16, 2025 |
| 424B5 | Prospectus supplement | Oct 16, 2025 | — |
| FWP | Free writing prospectus | Oct 16, 2025 | — |
| 8-K |
Current report
Other events
|
Oct 16, 2025 | Oct 16, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Oct 1, 2025 | Oct 1, 2025 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Sep 22, 2025 | Sep 22, 2025 |
| 4 | Insider transaction | Sep 19, 2025 | Sep 18, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 7, 2025 | — |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Aug 7, 2025 | 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 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 18, 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 | — |
| 10-Q | Quarterly report | May 7, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
May 7, 2025 | May 7, 2025 |
| ARS | Annual report to shareholders | Apr 29, 2025 | Apr 29, 2025 |
| DEFA14A | Additional proxy material | Apr 29, 2025 | — |
| DEF 14A | Proxy statement | Apr 29, 2025 | Apr 29, 2025 |
| PRE 14A | Preliminary proxy statement | Apr 16, 2025 | Apr 16, 2025 |
| 8-K |
Current report
Officer or director change
|
Apr 14, 2025 | Apr 14, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| S-8 | Employee stock plan registration | Feb 27, 2025 | — |
| 10-K | Annual report | Feb 27, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2025 | Feb 27, 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 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jan 14, 2025 | Jan 14, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 2, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 2, 2025 |
| 8-K |
Current report
Other events
|
Dec 9, 2024 | Dec 9, 2024 |
| 4 | Insider transaction | Nov 21, 2024 | Nov 19, 2024 |
| 3 | Initial insider ownership | Nov 21, 2024 | Nov 19, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Nov 20, 2024 | Nov 20, 2024 |
| 144 | Notice of proposed sale | Nov 18, 2024 | — |
| 424B3 | Prospectus | Nov 15, 2024 | — |
| 424B5 | Prospectus supplement | Nov 15, 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 | — |
| EFFECT | Filing | Nov 13, 2024 | — |
| EFFECT | Filing | Nov 13, 2024 | — |
| SUPPL | Filing | Nov 13, 2024 | — |
| SUPPL | Filing | Nov 13, 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 |
| CORRESP | Letter to the SEC | Nov 8, 2024 | — |
| CORRESP | Letter to the SEC | Nov 8, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 8, 2024 | — |
| UPLOAD | Letter from the SEC | Nov 7, 2024 | — |
| UPLOAD | Letter from the SEC | Nov 7, 2024 | — |
| S-3 | Shelf registration | Oct 31, 2024 | — |
| S-3 | Shelf registration | Oct 31, 2024 | — |
| 10-Q | Quarterly report | Oct 31, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 31, 2024 | Oct 31, 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 | — |
| 8-K/A |
Amended current report
Officer or director change, Regulation FD disclosure
|
Oct 16, 2024 | Oct 15, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Oct 15, 2024 | Oct 15, 2024 |
| 144 | Notice of proposed sale | Oct 11, 2024 | — |
| 8-K |
Current report
Officer or director change
|
Oct 11, 2024 | 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 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Sep 3, 2024 | Sep 3, 2024 |
| 10-Q | Quarterly report | Aug 1, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 1, 2024 | Aug 1, 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 |
| 8-K |
Current report
Shareholder vote results
|
Jun 21, 2024 | Jun 21, 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 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jun 10, 2024 | Jun 10, 2024 |
| 10-Q | Quarterly report | May 8, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 8, 2024 | May 8, 2024 |
| ARS | Annual report to shareholders | Apr 30, 2024 | Apr 30, 2024 |
| DEFA14A | Additional proxy material | Apr 29, 2024 | — |
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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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Source: SEC EDGAR filings. This is company-reported data, not investment advice.