Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
RA CAPITAL MANAGEMENT, L.P. - 12 May 2026 SCHEDULE 13D/A Report for WEREWOLF THERAPEUTICS, INC. Common Stock, $0.0001 par value per share (HOWL)
- Filing manager
- RA CAPITAL MANAGEMENT, L.P.
- Reporting owner
- RA Capital Management, L.P.
- Beneficially owned shares
- 6,116,140 shares
- Large-stake signal
-
Ownership
13%Beneficial ownership of this reported class.
Shares
6,116,140 sharesShares beneficially owned as disclosed.
Event date
12 May 2026Date tied to the ownership event or amendment.
Accepted by SEC
14 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
- 13%
- Symbol
- HOWL
- Shares outstanding
- 48,540,794 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 14 May 2026, 17:23:55 UTC
- Event date
- 12 May 2026
- Prior SEC filing
- 06 Nov 2025
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
5 source fields
Key filing fact
RA CAPITAL MANAGEMENT, L.P. disclosed 13% ownership in WEREWOLF THERAPEUTICS, INC. Common Stock, $0.0001 par value per share (HOWL) on 12 May 2026.
Key facts
- RA CAPITAL MANAGEMENT, L.P. filed SCHEDULE 13D/A for WEREWOLF THERAPEUTICS, INC. Common Stock, $0.0001 par value per share (HOWL).
- Disclosed ownership: 13%.
- Date of event: 12 May 2026.
Change
- Previous schedule filing date: 06 Nov 2025.
- Current filing was accepted on 14 May 2026, 17:23.
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
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (4)
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 |
|---|---|---|---|---|---|---|---|
| RA Capital Management, L.P. | 13% | 6,116,140 | 0 | 6,116,140 | /s/ Peter Kolchinsky | By Peter Kolchinsky, Authorized Signatory | 0001346824 |
| Peter Kolchinsky | 13% | 6,116,140 | 0 | 6,116,140 | /s/ Peter Kolchinsky | Peter Kolchinsky | 0001384859 |
| Rajeev Shah | 13% | 6,116,140 | 0 | 6,116,140 | /s/ Rajeev Shah | Rajeev Shah | 0001619841 |
| RA Capital Healthcare Fund, L.P. | 12% | 5,709,858 | 0 | 5,709,858 | /s/ Peter Kolchinsky | By RA Capital Healthcare Fund GP, LLC, its General Partner, By Peter Kolchinsky, Manager | 0001315082 |
CIK / CUSIP context first