Werewolf Therapeutics, Inc. SEC filings HOWL
Werewolf Therapeutics, Inc. has 450 filings in SEC EDGAR's recent list, going back to Aug 15, 2019. Its latest annual report, Form 10-K, was filed on Mar 27, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Jul 31, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 21, 2026 (material agreement, unregistered share sale, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| S-4/A | Registration of securities issued in business combination transactions | Oct 26, 2026 | — |
| S-4 | Registration for a merger or exchange | Sep 22, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 21, 2026 | — |
| 425 | Filing | Aug 21, 2026 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure
|
Aug 21, 2026 | Aug 21, 2026 |
| 8-K |
Current report
Material agreement
|
Aug 20, 2026 | Aug 14, 2026 |
| 10-Q | Quarterly report | Jul 31, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2026 | Jul 31, 2026 |
| 4 | Insider transaction | Jul 8, 2026 | Jul 6, 2026 |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jul 2, 2026 | — |
| 4 | Insider transaction | Jun 29, 2026 | Jun 29, 2026 |
| 144 | Notice of proposed sale | Jun 29, 2026 | — |
| 144 | Notice of proposed sale | Jun 29, 2026 | — |
| 144 | Notice of proposed sale | Jun 29, 2026 | — |
| 144 | Notice of proposed sale | Jun 29, 2026 | — |
| 144 | Notice of proposed sale | Jun 29, 2026 | — |
| 144 | Notice of proposed sale | Jun 29, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jun 26, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jun 22, 2026 | — |
| 4 | Insider transaction | Jun 22, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 16, 2026 | Jun 12, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jun 15, 2026 | — |
| 4 | Insider transaction | Jun 11, 2026 | Jun 9, 2026 |
| 4 | Insider transaction | Jun 10, 2026 | Jun 9, 2026 |
| 4 | Insider transaction | Jun 8, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | May 29, 2026 | May 27, 2026 |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 4 | Insider transaction | May 26, 2026 | May 21, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 144 | Notice of proposed sale | May 18, 2026 | — |
| 144 | Notice of proposed sale | May 18, 2026 | — |
| 144 | Notice of proposed sale | May 18, 2026 | — |
| 144 | Notice of proposed sale | May 18, 2026 | — |
| 144 | Notice of proposed sale | May 18, 2026 | — |
| 144 | Notice of proposed sale | May 18, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 14, 2026 | — |
| 4 | Insider transaction | May 13, 2026 | May 13, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 12, 2026 | — |
| 4 | Insider transaction | May 12, 2026 | May 8, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 8, 2026 |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| 4 | Insider transaction | May 7, 2026 | May 5, 2026 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 5, 2026 | — |
| 4 | Insider transaction | May 4, 2026 | Apr 30, 2026 |
| 144 | Notice of proposed sale | May 1, 2026 | — |
| 144 | Notice of proposed sale | May 1, 2026 | — |
| 144 | Notice of proposed sale | May 1, 2026 | — |
| 144 | Notice of proposed sale | May 1, 2026 | — |
| 144 | Notice of proposed sale | May 1, 2026 | — |
| 144 | Notice of proposed sale | May 1, 2026 | — |
| 4 | Insider transaction | Apr 29, 2026 | Apr 27, 2026 |
| 144 | Notice of proposed sale | Apr 29, 2026 | — |
| 144 | Notice of proposed sale | Apr 29, 2026 | — |
| 144 | Notice of proposed sale | Apr 29, 2026 | — |
| 144 | Notice of proposed sale | Apr 29, 2026 | — |
| 144 | Notice of proposed sale | Apr 29, 2026 | — |
| 144 | Notice of proposed sale | Apr 29, 2026 | — |
| 144 | Notice of proposed sale | Apr 27, 2026 | — |
| 144 | Notice of proposed sale | Apr 27, 2026 | — |
| 144 | Notice of proposed sale | Apr 27, 2026 | — |
| 144 | Notice of proposed sale | Apr 27, 2026 | — |
| 144 | Notice of proposed sale | Apr 27, 2026 | — |
| 144 | Notice of proposed sale | Apr 27, 2026 | — |
| 10-K | Annual report | Mar 27, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 27, 2026 | Mar 27, 2026 |
| 3 | Initial insider ownership | Mar 13, 2026 | Feb 13, 2026 |
| 8-K |
Current report
Other events
|
Feb 24, 2026 | Feb 24, 2026 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change, Regulation FD disclosure
|
Feb 13, 2026 | Feb 9, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 11, 2026 | — |
| 8-K |
Current report
Listing notice
|
Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Jan 20, 2026 | Jan 16, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jan 16, 2026 | — |
| 4 | Insider transaction | Jan 15, 2026 | Jan 13, 2026 |
| 4 | Insider transaction | Jan 12, 2026 | Jan 8, 2026 |
| 4 | Insider transaction | Jan 7, 2026 | Jan 5, 2026 |
| 144 | Notice of proposed sale | Jan 6, 2026 | — |
| 144 | Notice of proposed sale | Jan 6, 2026 | — |
| 144 | Notice of proposed sale | Jan 6, 2026 | — |
| 144 | Notice of proposed sale | Jan 6, 2026 | — |
| 144 | Notice of proposed sale | Jan 6, 2026 | — |
| 144 | Notice of proposed sale | Jan 6, 2026 | — |
| 4 | Insider transaction | Jan 2, 2026 | Dec 30, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 29, 2025 | — |
| 4 | Insider transaction | Dec 29, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 29, 2025 | — |
| 144 | Notice of proposed sale | Dec 29, 2025 | — |
| 144 | Notice of proposed sale | Dec 29, 2025 | — |
| 144 | Notice of proposed sale | Dec 29, 2025 | — |
| 144 | Notice of proposed sale | Dec 29, 2025 | — |
| 144 | Notice of proposed sale | Dec 29, 2025 | — |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 8-K |
Current report
Other events
|
Dec 18, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 17, 2025 | Dec 15, 2025 |
| 4 | Insider transaction | Dec 12, 2025 | Dec 10, 2025 |
| 144 | Notice of proposed sale | Dec 10, 2025 | — |
| 144 | Notice of proposed sale | Dec 10, 2025 | — |
| 144 | Notice of proposed sale | Dec 10, 2025 | — |
| 144 | Notice of proposed sale | Dec 10, 2025 | — |
| 144 | Notice of proposed sale | Dec 10, 2025 | — |
| 144 | Notice of proposed sale | Dec 10, 2025 | — |
| 4 | Insider transaction | Dec 9, 2025 | Dec 5, 2025 |
| 4 | Insider transaction | Dec 4, 2025 | Dec 2, 2025 |
| 4 | Insider transaction | Dec 4, 2025 | Dec 2, 2025 |
| 4 | Insider transaction | Dec 4, 2025 | Dec 2, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 3, 2025 | — |
| 144 | Notice of proposed sale | Dec 3, 2025 | — |
| 144 | Notice of proposed sale | Dec 3, 2025 | — |
| 144 | Notice of proposed sale | Dec 3, 2025 | — |
| 144 | Notice of proposed sale | Dec 3, 2025 | — |
| 144 | Notice of proposed sale | Dec 3, 2025 | — |
| 144 | Notice of proposed sale | Dec 3, 2025 | — |
| 4 | Insider transaction | Dec 1, 2025 | Nov 26, 2025 |
| 4 | Insider transaction | Dec 1, 2025 | Nov 26, 2025 |
| 4 | Insider transaction | Dec 1, 2025 | Nov 26, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 144 | Notice of proposed sale | Nov 24, 2025 | — |
| 144 | Notice of proposed sale | Nov 24, 2025 | — |
| 144 | Notice of proposed sale | Nov 24, 2025 | — |
| 144 | Notice of proposed sale | Nov 24, 2025 | — |
| 144 | Notice of proposed sale | Nov 24, 2025 | — |
| 144 | Notice of proposed sale | Nov 24, 2025 | — |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Nov 17, 2025 | — |
| 4 | Insider transaction | Nov 17, 2025 | Nov 13, 2025 |
| 4 | Insider transaction | Nov 17, 2025 | Nov 13, 2025 |
| 4 | Insider transaction | Nov 17, 2025 | Nov 13, 2025 |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 4 | Insider transaction | Nov 12, 2025 | Nov 7, 2025 |
| 4 | Insider transaction | Nov 12, 2025 | Nov 7, 2025 |
| 4 | Insider transaction | Nov 12, 2025 | Nov 7, 2025 |
| 144 | Notice of proposed sale | Nov 10, 2025 | — |
| 144 | Notice of proposed sale | Nov 10, 2025 | — |
| 144 | Notice of proposed sale | Nov 10, 2025 | — |
| 144 | Notice of proposed sale | Nov 10, 2025 | — |
| 144 | Notice of proposed sale | Nov 10, 2025 | — |
| 144 | Notice of proposed sale | Nov 10, 2025 | — |
| 4 | Insider transaction | Nov 6, 2025 | Nov 4, 2025 |
| 4 | Insider transaction | Nov 6, 2025 | Nov 4, 2025 |
| 4 | Insider transaction | Nov 6, 2025 | Nov 4, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Nov 6, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Nov 4, 2025 | — |
| 144 | Notice of proposed sale | Nov 4, 2025 | — |
| 144 | Notice of proposed sale | Nov 4, 2025 | — |
| 144 | Notice of proposed sale | Nov 4, 2025 | — |
| 144 | Notice of proposed sale | Nov 4, 2025 | — |
| 144 | Notice of proposed sale | Nov 4, 2025 | — |
| 144 | Notice of proposed sale | Nov 4, 2025 | — |
| 10-Q | Quarterly report | Nov 4, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2025 | Nov 4, 2025 |
| 4 | Insider transaction | Nov 3, 2025 | Oct 30, 2025 |
| 4 | Insider transaction | Nov 3, 2025 | Oct 30, 2025 |
| 4 | Insider transaction | Nov 3, 2025 | Oct 30, 2025 |
| 144 | Notice of proposed sale | Oct 30, 2025 | — |
| 144 | Notice of proposed sale | Oct 30, 2025 | — |
| 144 | Notice of proposed sale | Oct 30, 2025 | — |
| 144 | Notice of proposed sale | Oct 30, 2025 | — |
| 144 | Notice of proposed sale | Oct 30, 2025 | — |
| 144 | Notice of proposed sale | Oct 30, 2025 | — |
| 4 | Insider transaction | Oct 29, 2025 | Oct 27, 2025 |
| 4 | Insider transaction | Oct 29, 2025 | Oct 27, 2025 |
| 4 | Insider transaction | Oct 29, 2025 | Oct 27, 2025 |
| 144 | Notice of proposed sale | Oct 27, 2025 | — |
| 144 | Notice of proposed sale | Oct 27, 2025 | — |
| 144 | Notice of proposed sale | Oct 27, 2025 | — |
| 144 | Notice of proposed sale | Oct 27, 2025 | — |
| 144 | Notice of proposed sale | Oct 27, 2025 | — |
| 144 | Notice of proposed sale | Oct 27, 2025 | — |
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Company profile
- Industry
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- HOWL (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Waltham, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company, Emerging growth company
- SEC CIK
- 1785530
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.