HOWL · Werewolf Therapeutics, Inc.

$0.97 -0.02 (-1.82%) At close · Aug 27

Market Cap

$47.18M

48.60M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Quarter:

Holders: 46

Total Value: $3,943,768

Total Shares: 10,954,966

Institutional Ownership Trend

21 quarters

Holder Concentration

Across 46 13F filers · Δ vs Mar 31, 2026

Top Holder

21.8%

−25.9 pts

Top 5

61.4%

−12.8 pts

Top 10

81.6%

−9.2 pts

HHI

1,053

Broadly held−1,481

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -2

Institutional value: -66.2%

Shares held: -21.7%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Small Verdad Advisers, LP	+318,949	348,709
Mid XTX Topco Ltd	+220,549	271,478
Mega JANE STREET GROUP, LLC	+169,001	251,837
Large RENAISSANCE TECHNOLOGIES LLC	+158,414	674,632
Mega UBS Group AG	+148,981	215,838

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Large RA CAPITAL MANAGEMENT, L.P.	−4,293,563	2,387,744
Mid MPM BIOIMPACT LLC	−1,128,668	80,142
Mega MILLENNIUM MANAGEMENT LLC	−69,995	62,055
Mega GEODE CAPITAL MANAGEMENT, LLC	−53,672	335,815
Mid SIMPLEX TRADING, LLC	−32,271	255

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Large Balyasny Asset Management L.P.	1,790,089	$644,432
Large Squarepoint Ops LLC	103,242	$37,167
Small Rangeley Capital, LLC	100,000	$36,000
Mid Virtu Financial LLC	45,467	$16,368
Mega TWO SIGMA INVESTMENTS, LP	27,300	$9,828

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Small Squadron Capital Management LLC	563,535	$469,424
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC	77,000	$64,141
Mega RAYMOND JAMES FINANCIAL INC	19,778	$16,475
Large HRT FINANCIAL LP	17,861	$14,878
Small Delta Investment Management, LLC	14,925	$12,432

Filter: New 9 Increased 10 Reduced 9 Sold out 11 Unchanged 18

Showing 47 of 47

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

RA CAPITAL MANAGEMENT, L.P.

$859,587

21.80%

2,387,744

Balyasny Asset Management L.P.

$644,432

16.34%

1,790,089

VANGUARD CAPITAL MANAGEMENT LLC

$438,471

11.12%

1,217,976

RENAISSANCE TECHNOLOGIES LLC

$242,867

6.16%

674,632

Lynx1 Capital Management LP

$236,802

6.00%

657,786

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Lynx1 Capital Advisors LLC	657,786	$236,802	100.0%	Other

SPHERA FUNDS MANAGEMENT LTD.

$225,651

5.72%

626,810

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Sphera Global Healthcare Management LP joint	626,810	$225,651	100.0%	Defined

DC Funds, LP

$212,076

5.38%

589,102

Verdad Advisers, LP

$125,535

3.18%

348,709

GEODE CAPITAL MANAGEMENT, LLC

$120,893

3.07%

335,815

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	62,051	$22,338	18.5%	Defined
Held directly	273,764	$98,555	81.5%	Defined

BANK OF AMERICA CORP /DE/

$112,140

2.84%

311,502

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	23,206	$8,354	7.4%	Defined
MERRILL LYNCH, PIERCE, FENNER & SMITH INC.	288,296	$103,786	92.6%	Defined

XTX Topco Ltd

$97,732

2.48%

271,478

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	271,478	$97,732	100.0%	Defined

JANE STREET GROUP, LLC

$90,661

2.30%

251,837

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	146,573	$52,766	58.2%	Defined
Jane Street Global Trading, LLC	105,264	$37,895	41.8%	Defined

UBS Group AG

$77,700

1.97%

215,838

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	102	$36	0.0%	Defined
UBS Europe SE	215,736	$77,664	100.0%	Defined

VANGUARD FIDUCIARY TRUST CO

$56,781

1.44%

157,726

STATE STREET CORP

$42,900

1.09%

119,168

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	119,168	$42,900	100.0%	Defined

Squarepoint Ops LLC

$37,167

0.94%

103,242

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	103,242	$37,167	100.0%	Defined

BlackRock, Inc.

$36,566

0.93%

101,573

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	29,623	$10,664	29.2%	Sole
BlackRock Investment Management, LLC	250	$90	0.2%	Sole
BlackRock Institutional Trust Company, N.A.	71,700	$25,812	70.6%	Sole

Rangeley Capital, LLC

$36,000

0.91%

100,000

NORTHERN TRUST CORP

$31,266

0.79%

86,851

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	86,851	$31,266	100.0%	Defined

Alyeska Investment Group, L.P.

$31,159

0.79%

86,554

MPM BIOIMPACT LLC

$28,851

0.73%

80,142

CITADEL ADVISORS LLC

$27,000

0.68%

75,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	75,000	$27,000	100.0%	Defined

MILLENNIUM MANAGEMENT LLC

$22,339

0.57%

62,055

Virtu Financial LLC

$16,368

0.42%

45,467

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	45,467	$16,368	100.0%	Defined

TWO SIGMA INVESTMENTS, LP

$9,828

0.25%

27,300

GSA CAPITAL PARTNERS LLP

$9,772

0.25%

27,146

GOLDMAN SACHS GROUP INC

$7,208

0.18%

20,023

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	20,023	$7,208	100.0%	Defined

StoneX Group Inc.

$7,200

0.18%

20,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STONEX FINANCIAL INC.	20,000	$7,200	100.0%	Defined

MORGAN STANLEY

$6,878

0.17%

19,108

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO. LLC	1,885	$678	9.9%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	17,223	$6,200	90.1%	Defined

CITADEL ADVISORS LLC

$5,580

0.14%

15,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	15,500	$5,580	100.0%	Defined

CERTUITY, LLC

$5,400

0.14%

15,000

BARCLAYS PLC

$4,764

0.12%

13,235

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	13,235	$4,764	100.0%	Defined

HBK Sorce Advisory LLC

$4,761

0.12%

13,227

Larson Financial Group LLC

$4,698

0.12%

13,052

LPL Financial LLC

$4,244

0.11%

11,791

Ranch Capital Advisors Inc.

$3,960

0.10%

11,000

Marest Capital, LLC

$3,913

0.10%

10,870

Cetera Investment Advisers

$3,672

0.09%

10,200

Tower Research Capital LLC (TRC)

$3,562

0.09%

9,897

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	9,897	$3,562	100.0%	Defined

OSAIC HOLDINGS, INC.

$3,105

0.08%

8,625

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	8,575	$3,087	99.4%	Defined
Osaic Advisory Services, LLC	50	$18	0.6%	Defined

Financial Perspectives, Inc

$2,430

0.06%

6,750

JPMORGAN CHASE & CO

$758

0.02%

2,108

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities LLC	1,177	$423	55.8%	Defined
J.P. Morgan Securities plc	931	$335	44.2%	Defined

GROUP ONE TRADING LLC

$673

0.02%

1,871

BNP PARIBAS ARBITRAGE, SA

$284

0.01%

790

SIMPLEX TRADING, LLC

$91

0.00%

255

SBI Securities Co., Ltd.

$36

0.00%

100

Optiver Holding B.V.

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Optiver VOF	22	$7	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RAYMOND JAMES & ASSOCIATES	19,778	$16,475	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	3,384	$2,818	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	39	$32	100.0%	Defined

Key facts CIK 1785530 CUSIP 95075A107 13F (30d) 43 filings 43 filers Visit website