Werewolf Therapeutics, Inc. - Common Stock, $0.0001 par value per share (HOWL)

Q: What does CUSIP 95075A107 represent in this 13F holders report?

CUSIP 95075A107 is the security identifier for HOWL - Werewolf Therapeutics, Inc. - Common Stock, $0.0001 par value per share used to aggregate holder disclosures.

Q: How many institutions held HOWL - Werewolf Therapeutics, Inc. - Common Stock, $0.0001 par value per share in Q1 2026?

47 institutional investors reported HOWL - Werewolf Therapeutics, Inc. - Common Stock, $0.0001 par value per share for Q1 2026. Use the holders table for investor-level position and value details.

CUSIP: 95075A107

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / Common Stock, $0.0001 par value per share
Total 13F shares: 13,999,904
Total 13F value: $11,653,844
Share change: -716,645
SEC-reported price per share: $0.83
Number of holders: 47
Value change: -$532,173
Number of buys: 15
Number of sells: 21
Shares outstanding: 48,427,829

Security key

95075A107

Report period

Q1 2026

Institutions

Top holders

HOWL full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2026 Previous quarter: Q4 2025 Werewolf Therapeutics, Inc. SEC filings Werewolf Therapeutics, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 95075A107

Newer quarter: Q2 2026 Previous quarter: Q4 2025

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025

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

Ansbert Gadicke

Comparable rows

15/15

Latest evidence

13 Feb 2026

13D/G 3/4/5 13F 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%

Michael J. Urban 0.01%

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 13D/G	3.5%	$955,937 1,677,082 shares	$0	31 Dec 2025
PFM Health Sciences, LP	13D/G 13D/G	0.9%	$437,210 401,110 shares	-$2,729,747	30 Jun 2025
Ansbert Gadicke	3/4/5 Former 10% Owner 3/4/5	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 3/4/5	9.9%	$4,640,587 4,784,111 shares	-$2,223,357	02 Dec 2025
Michael J. Urban	3/4/5 VP of Finance & Corp. Contr. 3/4/5	0.01%	$3,381 5,284 shares	—	13 Feb 2026
RA CAPITAL MANAGEMENT, L.P.	13F Company 13F	14%	$4,232,608 6,681,307 shares	—	31 Dec 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 Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

13,999,904

Rows available

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 Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

Q1 2026 holders

Holder diff

-2

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 value	Q1 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend