Security key
95075A107
Werewolf Therapeutics, Inc. - Common Stock, $0.0001 par value per share (HOWL)
CUSIP: 95075A107
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / Common Stock, $0.0001 par value per share
- Total 13F shares
- 14,735,208
- Total 13F value
- $9,335,513
- Share change
- -1,994,785
- SEC-reported price per share
- $0.63
- Number of holders
- 49
- Value change
- -$2,241,745
- Number of buys
- 21
- Number of sells
- 30
- Shares outstanding
- 48,427,829
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
49
Top holders
10
HOWL full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q1 2026
Previous quarter: Q3 2025
Werewolf Therapeutics, Inc. SEC filings
Werewolf Therapeutics, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 95075A107
Recent filing periods:
Ownership snapshot
Top reported holders of HOWL - Werewolf Therapeutics, Inc. - Common Stock, $0.0001 par value per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Longwood Fund III, L.P.
Disclosed value leader
RA CAPITAL MANAGEMENT, L.P.
Comparable rows
15/15
Latest evidence
31 Dec 2025
13D/G
13F
3/4/5
Lead comparable stake: 3.5%
13D/G row: Longwood Fund III, L.P.
Showing 1-6 of 15 holder rows.
Quick read
Longwood Fund III, L.P. leads the comparable SEC ownership view at 3.5%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Longwood Fund III, L.P.'s linked filing trail.
Comparable ownership
Top 5
Longwood Fund III, L.P.
3.5%
PFM Health Sciences, LP
0.9%
Ansbert Gadicke
9.9%
MPM BioVentures 2014, L.P.
9.9%
RA CAPITAL MANAGEMENT, L.P.
14%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Longwood Fund III, L.P. |
13D/G
Longwood Fund III GP, LLC
|
3.5%
|
$955,937
1,677,082 shares
|
$0 | 31 Dec 2025 |
| PFM Health Sciences, LP |
13F
13D/G
Company
|
0.9%
from 13D/G
|
$790,187
401,110 shares
|
— | 30 Sep 2025 |
| Ansbert Gadicke |
3/4/5
Former 10% Owner
|
9.9%
|
$4,640,587
4,784,111 shares
|
-$2,223,357 | 02 Dec 2025 |
| MPM BioVentures 2014, L.P. |
3/4/5
Former 10% Owner
|
9.9%
|
$4,640,587
4,784,111 shares
|
-$2,223,357 | 02 Dec 2025 |
| RA CAPITAL MANAGEMENT, L.P. |
13F
Company
|
14%
|
$13,162,175
6,681,307 shares
|
— | 30 Sep 2025 |
| MPM ASSET MANAGEMENT LLC |
13F
Company
|
8.9%
|
$8,490,424
4,309,860 shares
|
— | 30 Sep 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
49
Shares
14,735,208
Rows available
49
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
62
Q4 2025 holders
49
Holder diff
-13
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend