Werewolf Therapeutics HOWL Insider Ownership

NASDAQ HOWL

$1.02 -0.03 (-2.86%)

As of: Oct 21, 2026 · 3:50 PM EDT

Insider Holdings by Owner

10.05Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

10.47%

▼-0.295% pp QoQ

Shares Held by Insiders

5.09Mn

filed for Sep 2026

▼-2.74% QoQ

Shares Outstanding

48.60Mn

48,599,066 shares

Direct Holdings

Indirect: 5.09Mn

Net Shares Traded (QoQ)

-143.20K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 5, 2026

Over the trailing 12 months, HOWL insiders sold $6.44 million worth of shares (8.35Mn shares) in open-market trades, with no open-market purchases.

Behind Werewolf Therapeutics' open-market sales in the past 12 months were 3 insiders, and no insider bought.
Luke Evnin (Director) was the top open-market seller of Werewolf Therapeutics over the past 12 months, with $3.26 million sold (4.31Mn shares) and the latest sale on July 7, 2026.
Per Business Quant, HOWL insiders together hold 5.09Mn shares based on their latest Form 4 filings, down 2.74% from 5.23Mn shares at the end of Q2 2026.
Werewolf Therapeutics insiders report no direct holdings: all 5.09Mn shares are held indirectly.
HOWL's insider total is spread across 2 insiders who have filed a Form 4 in the past two years.
HOWL's largest insider holders by reported holdings are MPM Bioventures 2014, L.P. (4.78Mn shares) and Ra Capital Management, L.P. (10% owner, 303.72K shares).
Of the shares held by HOWL insiders, 94.03% belong to MPM Bioventures 2014, L.P.
Institutions held 22.36% of Werewolf Therapeutics' outstanding shares in their Q2 2026 13F filings, insiders about 10.47% based on their latest Form 4 filings, and other investors, including the public, the remaining 67.17%.
Over the past 12 months, 4 insiders reported transactions in Werewolf Therapeutics stock in 53 Form 4 filings.
The insider holdings and trades above for Werewolf Therapeutics reflect Form 4 filings through July 8, 2026.

Form 4 Holdings

Insiders Holding HOWL

Insiders 5

Shares held 10.05Mn

Of outstanding 20.68%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Ansbert Gadicke	Other	0	4,784,111	4,784,111	47.6%	04 Dec, 2025
2	Bioventures 2014, L.P. Mpm	Other	0	4,784,111	4,784,111	47.6%	04 Dec, 2025
3	Capital Management, L.P. Ra	TenPercentOwner	0	303,719	303,719	3.0%	22 Jun, 2026
4	Cynthia Seidel-Dugan	Chief Scientific Officer	164,888	0	164,888	1.6%	14 Jan, 2022
5	Reid Leonard	Chief Operating Officer	14,102	0	14,102	0.1%	04 Jan, 2022

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

302 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
06 Jul, 2026	Luke Evnin	Director	Disposed S	35,770	$0.32	$11.45K	107,429	Indirect
07 Jul, 2026	Luke Evnin	Director	Disposed S	107,429	$0.31	$33.30K	0	Indirect
29 Jun, 2026	Luke Evnin	Director	Disposed S	157,084	$0.30	$47.13K	143,199	Indirect
17 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	389,216	$0.35	$136.23K	4,268,448	Indirect
17 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	27,695	$0.35	$9.69K	303,719	Indirect
12 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	159,119	$0.40	$63.65K	4,917,566	Indirect
12 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	11,322	$0.40	$4.53K	349,907	Indirect
15 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	120,216	$0.39	$46.88K	4,797,350	Indirect
15 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	8,554	$0.39	$3.34K	341,353	Indirect
16 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	139,686	$0.37	$51.68K	4,657,664	Indirect
16 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	9,939	$0.37	$3.68K	331,414	Indirect
09 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	345,235	$0.37	$127.74K	5,364,623	Indirect
09 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	24,565	$0.37	$9.09K	381,717	Indirect
10 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	42,872	$0.37	$15.86K	5,321,751	Indirect
10 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	3,051	$0.37	$1.13K	378,666	Indirect
11 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	245,066	$0.38	$93.13K	5,076,685	Indirect
11 Jun, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed S	17,437	$0.38	$6.63K	361,229	Indirect
09 Jun, 2026	Luke Evnin	Director	Disposed S	76,928	$0.37	$28.46K	300,283	Indirect
04 Jun, 2026	Luke Evnin	Director	Disposed S	20,072	$0.44	$8.83K	462,704	Indirect
05 Jun, 2026	Luke Evnin	Director	Disposed S	24,946	$0.40	$9.98K	437,758	Indirect

Showing 1 to 20 of 302 transactions