SCHEDULE Filed 2025-12-29 Event 2025-12-22 SEC 0001231919-25-000666 →

MPM BioVentures 2014, L.P. → Werewolf Therapeutics, Inc. HOWL

Stake: 8.20% Shares: 3,977,612 CUSIP: 95075A107 Class: Common Stock

Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 24/100 · Filer 90d Win Rate: 0% · Hist. 90d Edge: +0.0%

Passive Schedule 13G filer baseline
High conviction ownership stake (8.2%)
Held by 1 tracked 13F institutional manager
Elevated short days-to-cover (5.1 DTC)

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

10 13D/G filings on this issuer

9 other filings besides this one

Filer Track Record

13 filings by this filer

12 other filings in the data moat

Short Interest · settle 2026-10-15

DTC 5.10

2,356,300 shares short · -6.2% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $9K

Point72 Asset Mgmt

Post-Filing Returns · since 2025-12-22 on HOWL

+1 day

0.0%

+5 days

0.0%

+30 days

0.0%

+60 days

0.0%

+90 days

0.0%

+180 days

0.0%

Anchor price 0.34 on closest trading day on/after 2025-12-22. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Other 13D/G Filings on Werewolf Therapeutics, Inc.

Filed	Form	Filer	Stake	Shares
2026-09-21	SCHEDULE 13G	MOLL PETER	—	—	view →
2026-07-02	SCHEDULE 13D/A	RA CAPITAL MANAGEMENT, L.P.	4.10%	1,985,541	view →
2026-06-26	SCHEDULE 13D/A	RA CAPITAL MANAGEMENT, L.P.	6.00%	2,915,742	view →
2026-06-22	SCHEDULE 13D/A	RA CAPITAL MANAGEMENT, L.P.	—	3,654,307	view →
2026-06-15	SCHEDULE 13D/A	RA CAPITAL MANAGEMENT, L.P.	—	5,138,703	view →
2026-05-14	SCHEDULE 13D/A	RA CAPITAL MANAGEMENT, L.P.	—	6,116,140	view →
2025-05-14	SCHEDULE	RA CAPITAL MANAGEMENT, L.P.	15.00%	6,746,807	view →
2022-08-12	SC	RA CAPITAL MANAGEMENT, L.P.	—	—	view →
2021-06-16	SC	RA CAPITAL MANAGEMENT, L.P.	—	—	view →

Other Filings by MPM BioVentures 2014, L.P.

Filed	Form	Issuer	Stake	Shares
2026-09-10	SCHEDULE 13D/A	ENTRADA THERAPEUTICS, INC.	9.90%	1,764,167	view →
2025-01-31	SCHEDULE	Repare Therapeutics Inc.	4.60%	1,941,242	view →
2025-01-15	SCHEDULE	Repare Therapeutics Inc.	5.10%	2,149,415	view →
2025-01-06	SCHEDULE	Repare Therapeutics Inc.	6.30%	2,658,532	view →
2021-12-10	SC	iTeos Therapeutics, Inc.	—	—	view →
2021-10-19	SC	iTeos Therapeutics, Inc.	—	—	view →
2021-09-21	SC	iTeos Therapeutics, Inc.	—	—	view →
2021-07-21	SC	Repare Therapeutics Inc.	—	—	view →
2021-05-25	SC	Repare Therapeutics Inc.	—	—	view →
2021-05-06	SC	Harpoon Therapeutics, Inc.	—	—	view →
2021-03-23	SC	Repare Therapeutics Inc.	—	—	view →
2021-02-16	SC	Harpoon Therapeutics, Inc.	—	—	view →

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