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Disclosery

HOWL WEREWOLF THERAPEUTICS INC

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CMN (common), issuer CIK 1785530

46 managers (48 13F filers) reported a position in HOWL shares at 2026-03-31, 13,999,916 shares in all. 7 filers opened a position and 12 filers sold out during the quarter.

Managers
46
13F filers
48
New
7
Added
9
Reduced
12
Sold out
12
Shares held by filers
13,999,916

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
RA CAPITAL MANAGEMENT, L.P.in group RA CAPITAL MANAGEMENT, L.P.6,681,307$5.56M0.06%013F-HRTimelineGroup
VANGUARD GROUP INCgroup of 3 filers holding1,386,045$1.15MnewTimeline
MPM BIOIMPACT LLC1,208,810$1.01M0.08%-184,74713F-HRTimeline
Lynx1 Capital Management LPin group Lynx1 Capital Management LP657,786$548K0.09%+1,86013F-HRTimelineGroup
SPHERA FUNDS MANAGEMENT LTD.in group SPHERA FUNDS MANAGEMENT LTD.626,810$522K0.09%013F-HRTimelineGroup
DC Funds, LP589,102$490K33.01%013F-HRTimeline
Squadron Capital Management LLC563,535$469K0.19%new13F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC516,218$430K<0.01%-161,54813F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC389,487$324K<0.01%+53,60113F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/264,583$220K<0.01%-472,96713F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC132,050$110K<0.01%-108,05913F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP119,168$99.2K<0.01%013F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.101,608$84.6K<0.01%-3513F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP86,851$72.3K<0.01%013F-HRTimelineGroup
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.86,554$72.1K<0.01%-149,15113F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC82,836$69K<0.01%-74,48613F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC77,000$64.1K<0.01%013F-HRTimeline
UBS Group AGin group UBS Group AG66,857$55.7K<0.01%+6,14913F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd50,929$42.4K<0.01%new13F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC38,266$31.9K<0.01%+4,19313F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY33,799$28.1K<0.01%-12,20313F-HRTimelineGroup
SIMPLEX TRADING, LLC32,526$27.1K<0.01%+8,47213F-HRTimeline
Verdad Advisers, LP29,760$24.8K0.03%new13F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC19,778$16.5K<0.01%new13F-HRTimelineGroup
HRT FINANCIAL LP17,861$14K<0.01%new13F-HRTimeline
CERTUITY, LLC15,000$12.5K<0.01%013F-HRTimeline
Delta Investment Management, LLC14,925$12.4K<0.01%013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC13,235$11K<0.01%-113F-HRTimelineGroup
Larson Financial Group LLC13,052$10.9K<0.01%013F-HRTimeline
Ranch Capital Advisors Inc.12,000$9.99K<0.01%013F-HRTimeline
HBK Sorce Advisory LLC13,227$8.99K<0.01%013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC10,382$8.64K<0.01%new13F-HRTimelineGroup
Cetera Investment Advisers10,200$8.49K<0.01%013F-HRTimeline
LPL Financial LLC10,000$8.33K<0.01%new13F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.8,625$7.16K<0.01%013F-HRTimelineGroup
Financial Perspectives, Inc6,750$5.62K<0.01%013F-HRTimeline
TFC Financial Management, Inc.4,500$3.75K<0.01%013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC3,384$2.82K<0.01%+3,38313F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO2,096$1.67K<0.01%+2413F-HR/ATimelineGroup
GROUP ONE TRADING LLC1,871$1.56K<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS790$658<0.01%-213F-HRTimelineGroup
NORTHWESTERN MUTUAL WEALTH MANAGEMENT COin group NORTHWESTERN MUTUAL INVESTMEN…200$167<0.01%+19613F-HRTimelineGroup
SBI Securities Co., Ltd.80$67<0.01%+4013F-HRTimeline
FMR LLCin group FMR LLC39$32<0.01%-3,59213F-HRTimelineGroup
Arax Advisory Partners12$32<0.01%-2713F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.22$18<0.01%013F-HR/ATimelineGroup