HOWL · Insider Trading

Werewolf Therapeutics, Inc. Common Stock

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Every open-market purchase and sale reported by HOWL officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.

Form 4 Filings

most recent

Open-Market Buys

code P

Sales

code S

Reporting Insiders

current holders

HOWL — Recent Form 4 Transactions (latest 2026-07-08)

Filed	Insider	Role	Type	Shares	Value
2026-07-08	Luke Evnin	Director	Sell	−143,199	−$44.75K
2026-06-29	Luke Evnin	Director	Sell	−157,084	−$47.13K
2026-06-22	RA CAPITAL MANAGEMENT, L.P.	10%+ Owner	Sell	−1,667,644	−$583.68K
2026-06-16	Rajeev M. Shah	10%+ Owner	Sell	−1,795,344	−$695.03K
2026-06-11	Peter Kolchinsky	10%+ Owner	Sell	−2,712,904	−$1.01M
2026-06-10	Luke Evnin	Director	Sell	−76,928	−$28.46K
2026-06-08	Luke Evnin	Director	Sell	−105,565	−$43.03K
2026-06-03	Luke Evnin	Director	Sell	−139,803	−$63.63K
2026-05-29	Luke Evnin	Director	Sell	−141,106	−$66.20K
2026-05-26	Luke Evnin	Director	Sell	−191,762	−$86.56K
2026-05-20	Luke Evnin	Director	Sell	−171,049	−$76.36K
2026-05-13	Luke Evnin	Director	Sell	−44,679	−$24.13K
2026-05-12	Luke Evnin	Director	Sell	−407,574	−$280.21K
2026-05-12	Peter Kolchinsky	10%+ Owner	Sell	−2,260,668	−$1.56M
2026-05-07	Luke Evnin	Director	Sell	−100,581	−$64.22K
2026-05-04	Luke Evnin	Director	Sell	−274,619	−$198.31K
2026-04-29	Luke Evnin	Director	Sell	−205,911	−$154.53K
2026-01-20	Luke Evnin	Director	Sell	−38,782	−$20.94K
2026-01-15	Luke Evnin	Director	Sell	−111,227	−$61.79K
2026-01-12	Luke Evnin	Director	Sell	−91,374	−$53.53K
2026-01-07	Luke Evnin	Director	Sell	−71,054	−$45.88K
2026-01-02	Luke Evnin	Director	Sell	−78,377	−$48.43K
2025-12-29	Luke Evnin	Director	Sell	−291,283	−$185.22K
2025-12-17	Luke Evnin	Director	Sell	−48,171	−$51.95K
2025-12-12	Luke Evnin	Director	Sell	−82,971	−$88.59K
2025-12-09	Luke Evnin	Director	Sell	−95,179	−$94.79K
2025-12-04	Luke Evnin	Director	Sell	−128,185	−$117.62K
2025-12-04	MPM BioVentures 2014, L.P.	—	Sell	−998,660	−$916.38K
2025-12-04	MPM ASSET MANAGEMENT LLC	—	Sell	−1,398,124	−$1.28M
2025-12-01	Luke Evnin	Director	Sell	−91,088	−$87.83K
2025-12-01	MPM ASSET MANAGEMENT LLC	10%+ Owner	Sell	−993,489	−$957.98K
2025-12-01	MPM Asset Management Investors BV2014 LLC	10%+ Owner	Sell	−709,635	−$684.27K
2025-11-25	Luke Evnin	Director	Sell	−125,576	−$115.23K
2025-11-25	MPM BioVentures 2014 LLC	10%+ Owner	Sell	−978,330	−$897.76K
2025-11-25	Oncology Impact Fund (Cayman) Management L.P.	10%+ Owner	Sell	−1,369,662	−$1.26M
2025-11-20	MPM BioVentures 2014 LLC	10%+ Owner	Sell	−800,515	−$739.56K
2025-11-20	Oncology Impact Fund (Cayman) Management L.P.	10%+ Owner	Sell	−1,120,721	−$1.04M
2025-11-20	Luke Evnin	Director	Sell	−102,753	−$94.93K
2025-11-17	Luke Evnin	Director	Sell	−134,553	−$128.79K
2025-11-17	MPM Oncology Innovations Fund GP LLC	10%+ Owner	Sell	−1,467,564	−$1.40M
2025-11-17	MPM Asset Management Investors BV2014 LLC	10%+ Owner	Sell	−1,048,260	−$1.00M
2025-11-12	MPM BioVentures 2014 (B), L.P.	10%+ Owner	Sell	−1,067,645	−$1.21M
2025-11-12	Luke Evnin	Director	Sell	−137,041	−$154.85K
2025-11-12	MPM ASSET MANAGEMENT LLC	10%+ Owner	Sell	−1,494,703	−$1.69M
2025-11-06	Luke Evnin	Director	Sell	−155,885	−$189.83K
2025-11-06	MPM BioVentures 2014 GP LLC	10%+ Owner	Sell	−1,214,450	−$1.48M
2025-11-06	Oncology Impact Fund (Cayman) Management L.P.	10%+ Owner	Sell	−1,700,230	−$2.07M
2025-11-03	Luke Evnin	Director	Sell	−189,356	−$251.35K
2025-11-03	MPM BioVentures 2014 LLC	10%+ Owner	Sell	−1,475,215	−$1.96M
2025-11-03	Ansbert Gadicke	10%+ Owner	Sell	−2,065,301	−$2.74M

HOWL — Current Insider Holders

Insider	Role	Shares Held	Value
MPM BioImpact LLC	10%+ Owner	6,718,670	$6.59M
Ansbert Gadicke	10%+ Owner	6,147,610	$6.03M
MPM BioVentures 2014 GP LLC	10%+ Owner	5,904,720	$5.79M
MPM BioVentures 2014 (B), L.P.	10%+ Owner	5,731,860	$5.62M
MPM Oncology Innovations Fund GP LLC	10%+ Owner	5,538,600	$5.43M
MPM BioVentures 2014 LLC	10%+ Owner	5,257,105	$5.16M
Oncology Impact Fund (Cayman) Management L.P.	10%+ Owner	5,125,770	$5.03M
Peter Kolchinsky	10%+ Owner	5,076,685	$4.98M
MPM Asset Management Investors BV2014 LLC	10%+ Owner	5,044,760	$4.95M
MPM BioVentures 2014, L.P.	—	4,867,341	$4.77M
MPM ASSET MANAGEMENT LLC	10%+ Owner	4,784,111	$4.69M
Alon Lazarus	Director	1,646,634	$1.61M
Rajeev M. Shah	Director	341,353	$334.73K
RA CAPITAL MANAGEMENT, L.P.	Director	303,719	$297.83K
Luke Evnin	Director	107,429	$105.34K

HOWL Insider Trading FAQ

Who are the insiders at HOWL?

15 officers, directors and 10%+ beneficial owners currently report holdings in HOWL via SEC Form 4.

Are HOWL insiders buying or selling?

Across the 50 most recent Form 4 filings for HOWL, 0 were open-market purchases (code P) and 50 were sales (code S). Sales frequently reflect scheduled 10b5-1 plans or tax withholding rather than a view on the stock.

How current is HOWL insider data?

Form 4 must be filed within two business days of the transaction, so this is close to real time. The most recent HOWL filing is dated 2026-07-08.

How to read Form 4 activity

Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.

Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.

Full filing history and per-insider positions are on the HOWL quote page; the site-wide leaderboard is on the insider transactions hub.