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 | — |
| 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 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 2026 |
| 10-K | Annual report | Mar 27, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 27, 2026 | Mar 27, 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 |
| 8-K |
Current report
Listing notice
|
Feb 6, 2026 | Feb 4, 2026 |
| 8-K |
Current report
Other events
|
Dec 18, 2025 | Dec 18, 2025 |
| 10-Q | Quarterly report | Nov 4, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2025 | Nov 4, 2025 |
| 8-K |
Current report
Listing notice
|
Oct 6, 2025 | Oct 2, 2025 |
| 10-Q | Quarterly report | Aug 14, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 14, 2025 | Aug 14, 2025 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 13, 2025 | Jun 12, 2025 |
| EFFECT | Filing | May 15, 2025 | — |
| 8-K |
Current report
Listing notice
|
May 15, 2025 | May 13, 2025 |
| CORRESP | Letter to the SEC | May 13, 2025 | — |
| UPLOAD | Letter from the SEC | May 12, 2025 | — |
| S-3 | Shelf registration | May 8, 2025 | — |
| S-8 | Employee stock plan registration | May 8, 2025 | — |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 8, 2025 | May 8, 2025 |
| ARS | Annual report to shareholders | Apr 28, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 28, 2025 | — |
| DEF 14A | Proxy statement | Apr 28, 2025 | Jun 12, 2025 |
| 424B5 | Prospectus supplement | Mar 11, 2025 | — |
| S-8 | Employee stock plan registration | Mar 11, 2025 | — |
| 10-K | Annual report | Mar 11, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 11, 2025 | Mar 11, 2025 |
| 8-K |
Current report
Officer or director change
|
Feb 24, 2025 | Feb 19, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 12, 2024 | Nov 12, 2024 |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 7, 2024 | Nov 7, 2024 |
| S-8 POS | Filing | Aug 8, 2024 | — |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 25, 2024 | Jun 25, 2024 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 3, 2024 | Jun 1, 2024 |
| 8-K |
Current report
Shareholder vote results
|
May 28, 2024 | May 24, 2024 |
| 10-Q | Quarterly report | May 3, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 3, 2024 | May 3, 2024 |
| ARS | Annual report to shareholders | Apr 12, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 12, 2024 | — |
| DEF 14A | Proxy statement | Apr 12, 2024 | May 24, 2024 |
| S-8 | Employee stock plan registration | Mar 7, 2024 | — |
| 10-K | Annual report | Mar 7, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Mar 7, 2024 | Mar 7, 2024 |
| 8-K |
Current report
Other events
|
Feb 9, 2024 | Feb 9, 2024 |
| 424B5 | Prospectus supplement | Feb 9, 2024 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 8, 2024 | Jan 8, 2024 |
| 8-K |
Current report
Officer or director change
|
Jan 4, 2024 | Jan 4, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 14, 2023 | Nov 14, 2023 |
| 10-Q | Quarterly report | Nov 14, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Nov 3, 2023 | Nov 3, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 18, 2023 | Sep 18, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2023 | Aug 10, 2023 |
| 10-Q | Quarterly report | Aug 10, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 27, 2023 | Jun 21, 2023 |
| 10-Q | Quarterly report | May 11, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 11, 2023 | May 11, 2023 |
| ARS | Annual report to shareholders | Apr 28, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Apr 27, 2023 | — |
| DEF 14A | Proxy statement | Apr 27, 2023 | Jun 21, 2023 |
| S-8 | Employee stock plan registration | Mar 23, 2023 | — |
| 10-K | Annual report | Mar 23, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Mar 23, 2023 | Mar 23, 2023 |
| 8-K |
Current report
Material agreement
|
Mar 22, 2023 | Mar 16, 2023 |
| 8-K |
Current report
Other events
|
Jan 10, 2023 | Jan 10, 2023 |
| 10-Q | Quarterly report | Nov 10, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2022 | Nov 10, 2022 |
| 8-K |
Current report
Auditor change
|
Sep 7, 2022 | Aug 31, 2022 |
| 10-Q | Quarterly report | Aug 11, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2022 | Aug 11, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 7, 2022 | Jun 1, 2022 |
| EFFECT | Filing | May 20, 2022 | — |
| CORRESP | Letter to the SEC | May 18, 2022 | — |
| UPLOAD | Letter from the SEC | May 13, 2022 | — |
| S-3 | Shelf registration | May 10, 2022 | — |
| 10-Q | Quarterly report | May 10, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 10, 2022 | May 10, 2022 |
| DEFA14A | Additional proxy material | Apr 22, 2022 | — |
| DEF 14A | Proxy statement | Apr 22, 2022 | Jun 1, 2022 |
| 8-K |
Current report
Material agreement, New debt, Officer or director change
|
Apr 15, 2022 | Apr 12, 2022 |
| 8-K |
Current report
Material agreement
|
Apr 7, 2022 | Apr 6, 2022 |
| S-8 | Employee stock plan registration | Mar 24, 2022 | — |
| 10-K | Annual report | Mar 24, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Mar 24, 2022 | Mar 24, 2022 |
| 10-Q | Quarterly report | Nov 10, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2021 | Nov 10, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 28, 2021 | Oct 28, 2021 |
| 10-Q | Quarterly report | Aug 12, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2021 | Aug 12, 2021 |
| 10-Q | Quarterly report | Jun 10, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
Jun 10, 2021 | Jun 10, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 2, 2021 | Jun 1, 2021 |
| 8-K |
Current report
Officer or director change
|
May 28, 2021 | May 27, 2021 |
| 8-K |
Current report
Bylaw or fiscal year change
|
May 5, 2021 | May 4, 2021 |
| 424B4 | Prospectus | Apr 30, 2021 | — |
| S-8 | Employee stock plan registration | Apr 30, 2021 | — |
| SEC STAFF LETTER | Filing | Apr 29, 2021 | — |
| EFFECT | Filing | Apr 29, 2021 | — |
| S-1MEF | Filing | Apr 29, 2021 | — |
| CERT | Filing | Apr 29, 2021 | — |
| CORRESP | Letter to the SEC | Apr 27, 2021 | — |
| CORRESP | Letter to the SEC | Apr 27, 2021 | — |
| 8-A12B | Filing | Apr 27, 2021 | — |
| S-1/A | Amended registration statement | Apr 26, 2021 | — |
| SEC STAFF LETTER | Filing | Apr 23, 2021 | — |
| CORRESP | Letter to the SEC | Apr 8, 2021 | — |
| S-1 | Registration statement | Apr 8, 2021 | — |
| UPLOAD | Letter from the SEC | Mar 29, 2021 | — |
| DRS | Filing | Feb 26, 2021 | — |
| D | Filing | Jan 7, 2021 | — |
| D/A | Filing | Aug 13, 2020 | — |
| D | Filing | Aug 15, 2019 | — |
Showing 122 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.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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
Other Pharmaceutical Preparations companies
- ELI LILLY & Co LLY
- Johnson & Johnson JNJ
- AbbVie Inc. ABBV
- Merck & Co., Inc. MRK
- Novartis AG NVS
- Astrazeneca PLC AZN
- Abbott Laboratories ABT
- Novo Nordisk A S NVO
Source: SEC EDGAR filings. This is company-reported data, not investment advice.