InsiderClue
← All stocks

Werewolf Therapeutics, Inc.

HOWL Net buying
CIK 0001785530 #5027 in the set updated 20 Sep 2026
Bought (120 mo)
$91.70M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$8.72M
$7.70M on a plan · $9.21K straight out of an exercise
Sold at will
$1.00M
22 of 168 sales
Net
+$82.98M
+$90.69M against sales at will

By person

15 insiders · 190 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
RA CAPITAL MANAGEMENT, L.P. entity
10% owner
$36.15M (9)
$963.93K (20)
+$35.19M
4,595,600
9.46%
$1.42M
+19,512%
Flynn James E
10% owner
$12.80M (1)
—
+$12.80M
2,552,787
5.25%
$791.36K
—
Sphera Global Healthcare Management LP entity
10% owner
$7.60M (1)
—
+$7.60M
787,997
1.62%
$244.28K
—
Arkin Bio Ventures 2 L.P. entity
10% owner
$6.40M (1)
—
+$6.40M
2,046,634
4.21%
$634.46K
—
Lazarus Alon
Director
$6.40M (1)
—
+$6.40M
2,046,634
4.21%
$634.46K
—
Asanuma Sakae
Director
$5.00M (1)
—
+$5.00M
2,068,909
4.26%
$641.36K
—
Taiho Ventures LLC entity
10% owner
$5.00M (1)
—
+$5.00M
2,068,909
4.26%
$641.36K
—
Longwood Fund III GP, LLC entity
10% owner
$4.00M (1)
—
+$4.00M
1,677,082
3.45%
$519.90K
—
GADICKE ANSBERT
Former 10% Owner
$3.92M (1)
$2.23M (29) scheduled
+$1.69M
11,456,294
23.57%
$3.55M
+60.6%
EVNIN LUKE
Director
$2.41M (1)
$3.26M (88) scheduled
−$845.32K
4,284,172
8.82%
$1.33M
−9.7%
MPM BioVentures 2014, L.P.
Former 10% Owner
$2.01M (1)
$2.23M (29) scheduled
−$213.27K
7,972,109
16.40%
$2.47M
+19.0%
Leonard Reid
Chief Operating Officer
—
$40.24K (2)
−$40.24K
136,259
0.2804%
$42.24K
+8.9%
UPMC
10% owner
—
—
—
1,097,756
2.26%
$340.30K
—
HBM Healthcare Investments (Cayman) Ltd. entity
10% owner
—
—
—
625,995
1.29%
$194.06K
—
Seidel-Dugan Cynthia
Chief Scientific Officer
—
—
—
164,888
0.3393%
$51.12K
+31.7%

Individual transactions

19
Insider
Date
Role
Action
Shares
Price
Amount
RA CAPITAL MANAGEMENT, L.P.
14 May 2025
Director
Buy indirect
162,539
$0.98
$159.29K
RA CAPITAL MANAGEMENT, L.P.
13 May 2025
Director
Buy indirect
52,974
$0.98
$51.91K
RA CAPITAL MANAGEMENT, L.P.
12 May 2025
Director
Buy indirect
320,913
$0.86
$275.99K
RA CAPITAL MANAGEMENT, L.P.
6 Jan 2023
Director
Buy indirect
1,853,000
$2.21
$4.10M
RA CAPITAL MANAGEMENT, L.P.
16 Jun 2021
Director
Buy indirect
9,285
$13.37
$124.14K
RA CAPITAL MANAGEMENT, L.P.
15 Jun 2021
Director
Buy indirect
7,958
$12.95
$103.06K
RA CAPITAL MANAGEMENT, L.P.
14 Jun 2021
Director
Buy indirect
306,055
$12.75
$3.90M
Flynn James E
4 May 2021
10% owner
Buy indirect
800,000
$16.00
$12.80M
Sphera Global Healthcare Management LP
4 May 2021
10% owner
Buy indirect
475,000
$16.00
$7.60M
Lazarus Alon
4 May 2021
Director
Buy indirect
400,000
$16.00
$6.40M
Longwood Fund III GP, LLC
4 May 2021
10% owner
Buy indirect
250,000
$16.00
$4.00M
Arkin Bio Ventures 2 L.P.
4 May 2021
10% owner
Buy indirect
400,000
$16.00
$6.40M
Asanuma Sakae
4 May 2021
Director
Buy indirect
312,500
$16.00
$5.00M
Taiho Ventures LLC
4 May 2021
10% owner
Buy
312,500
$16.00
$5.00M
EVNIN LUKE
4 May 2021
Director
Buy indirect
150,799
$16.00
$2.41M
GADICKE ANSBERT
4 May 2021
10% owner
Buy indirect
245,000
$16.00
$3.92M
MPM BioVentures 2014, L.P.
4 May 2021
10% owner
Buy indirect
125,759
$16.00
$2.01M
RA CAPITAL MANAGEMENT, L.P.
4 May 2021
Director
Buy indirect
105,788
$16.00
$1.69M
RA CAPITAL MANAGEMENT, L.P.
4 May 2021
Director
Buy indirect
1,609,212
$16.00
$25.75M
Show all 190 transactions →

What was left out

Form 4 filings counted 144
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 37
Sales on a Rule 10b5-1 plan 143
Sales straight out of an exercise 3
Sales at will 22
Transactions with no price 0
Shares from compensation/vesting 27,131,842
Sales filed before the plan box existed 2
History held since 3 May 2021