Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
MPM BioVentures 2014, L.P. - 01 May 2026 SCHEDULE 13D/A Report for WEREWOLF THERAPEUTICS, INC. Common Stock (HOWL)
- Filing manager
- MPM BioVentures 2014, L.P.
- Reporting owner
- ANSBERT GADICKE
- Beneficially owned shares
- 2,608,501 shares
- Large-stake signal
-
Ownership
5.4%Beneficial ownership of this reported class.
Shares
2,608,501 sharesShares beneficially owned as disclosed.
Event date
01 May 2026Date tied to the ownership event or amendment.
Accepted by SEC
05 May 2026EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 5.4%
- Symbol
- HOWL
- Shares outstanding
- 48,305,574 shares
- Form type
- SCHEDULE 13D/A
- Accepted by SEC
- 05 May 2026, 19:04:02 UTC
- Event date
- 01 May 2026
- Previous filing
- 16 Jan 2026
- Next filing
- 12 May 2026
- SEC filing
- View on sec.gov
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Who this page is about.
2 source fields
Source evidence
Original filing metadata and source links.
6 source fields
Key filing fact
MPM BioVentures 2014, L.P. disclosed 5.4% ownership in WEREWOLF THERAPEUTICS, INC. Common Stock (HOWL) on 01 May 2026.
Key facts
- MPM BioVentures 2014, L.P. filed SCHEDULE 13D/A for WEREWOLF THERAPEUTICS, INC. Common Stock (HOWL).
- Disclosed ownership: 5.4%.
- Date of event: 01 May 2026.
Change
- Previous schedule filing date: 16 Jan 2026.
- Current filing was accepted on 05 May 2026, 19:04.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (14)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| MPM BioVentures 2014, L.P. | 2.3% | 1,131,359 | 1,131,359 | 0 | /s/ Ansbert Gadicke | Managing Director of MPM BioVentures 2014 LLC, the Managing Member of MPM BioVentures 2014 GP LLC, the General Partner of MPM BioVentures 2014, L.P. | 0001609492 |
| MPM BioVentures 2014 (B), L.P. | 0.2% | 75,458 | 75,458 | 0 | /s/ Ansbert Gadicke | Managing Director of MPM BioVentures 2014 LLC, Managing Member of MPM BioVentures 2014 GP LLC, the General Partner of MPM BioVentures 2014 (B), L.P. | 0001609493 |
| MPM Asset Management Investors BV2014 LLC | 0.1% | 38,939 | 38,939 | 0 | /s/ Ansbert Gadicke | Managing Director of MPM BioVentures 2014 LLC, the manager of MPM Asset Management Investors BV2014 LLC | 0001609495 |
| UBS Oncology Impact Fund L.P. | 1.9% | 936,031 | 936,031 | 0 | /s/ Ansbert Gadicke | Managing Partner of MPM BioImpact LLC, the GP of Oncology Impact Fund (Cayman) Management L.P., the GP of UBS Oncology Impact Fund L.P. | 0001691428 |
| MPM BioVentures 2014 GP LLC | 2.5% | 1,206,817 | 0 | 1,206,817 | /s/ Ansbert Gadicke | Managing Director of MPM BioVentures 2014 LLC, the Managing Member of MPM BioVentures 2014 GP LLC | 0001765091 |
| MPM BioVentures 2014 LLC | 2.6% | 1,245,756 | 0 | 1,245,756 | /s/ Ansbert Gadicke | Managing Director | 0001765021 |
| Oncology Impact Fund (Cayman) Management L.P. | 1.9% | 936,031 | 0 | 936,031 | /s/ Ansbert Gadicke | Managing Partner of MPM BioImpact LLC, the General Partner of Oncology Impact Fund (Cayman) Management L.P. | 0001721036 |
| MPM BioImpact LLC | 1.9% | 936,031 | 0 | 936,031 | /s/ Ansbert Gadicke | Managing Partner | 0001687078 |
| ANSBERT GADICKE | 5.4% | 2,608,501 | 0 | 2,608,501 | /s/ Ansbert Gadicke | Ansbert Gadicke | 0001134655 |
| LUKE EVNIN | 3.4% | 1,672,470 | 0 | 1,672,470 | /s/ Luke Evnin | Luke Evnin | 0001134657 |
| Todd Foley | 2.6% | 1,245,756 | 0 | 1,245,756 | /s/ Todd Foley | Todd Foley | 0001473930 |
| MPM ASSET MANAGEMENT LLC | 0.4% | 179,188 | 179,188 | 0 | /s/ Ansbert Gadicke | Member | 0001263048 |
| MPM ONCOLOGY INNOVATIONS FUND LP | 0.5% | 247,526 | 247,526 | 0 | /s/ Ansbert Gadicke | Manager of MPM Oncology Innovations Fund GP LLC, the General Partner of MPM Oncology Innovations Fund, L.P. | 0001719960 |
| MPM Oncology Innovations Fund GP LLC | 0.5% | 247,526 | 0 | 247,526 | /s/ Ansbert Gadicke | Manager | 0001857903 |
CIK / CUSIP context first