HOWL
Werewolf Therapeutics, Inc.Company with tickers: HOWL
CIK
1785530
CUSIP
95075A107
Shares Outstanding
48,596,817
13F Activity (30d)
45 filings
43 filers
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.
Holders: 48
Total Value: $11,661,901
Total Shares: 13,999,916
Institutional Ownership Trend
Holder Concentration
Across 48 13F filers · Δ vs Dec 31, 2025Top Holder
47.7%
+2.4 pts
Top 5
74.2%
+0.3 pts
Top 10
90.8%
+0.3 pts
HHI
2,534
Highly concentrated
+183
Quarterly Activity
vs Dec 31, 2025
New
10
Increased
9
Decreased
12
Sold Out
13
Unchanged
17
Holder count:
-3
Institutional value:
+24.8%
Shares held:
-5.0%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega GEODE CAPITAL MANAGEMENT, LLC | +53,601 | 389,487 | |
| Mid SIMPLEX TRADING, LLC | +8,472 | 32,526 | |
| Mega UBS Group AG | +6,149 | 66,857 | |
| Mega GOLDMAN SACHS GROUP INC | +4,193 | 38,266 | |
| Mega CITIGROUP INC | +3,383 | 3,384 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega BANK OF AMERICA CORP /DE/ | −472,967 | 264,583 | |
| Mid MPM BIOIMPACT LLC | −184,747 | 1,208,810 | |
| Large RENAISSANCE TECHNOLOGIES LLC | −161,548 | 516,218 | |
| Large Alyeska Investment Group, L.P. | −149,151 | 86,554 | |
| Mega MILLENNIUM MANAGEMENT LLC | −108,059 | 132,050 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 1,217,976 | $1,014,574 | |
| Small Squadron Capital Management LLC | 563,535 | $469,424 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 157,726 | $131,385 | |
| Mid XTX Topco Ltd | 50,929 | $42,423 | |
| Micro Verdad Advisers, LP | 29,760 | $24,790 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 1,408,047 | $892,700 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | 99,829 | $63,290 | |
| Large Vontobel Holding Ltd. | 60,003 | $38,041 | |
| Small Regal Investment Advisors LLC | 52,593 | $33,343 | |
| Large EDGEWOOD MANAGEMENT LLC | 50,000 | $31,700 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mid RA CAPITAL MANAGEMENT, L.P. | $5,565,528 | 47.72% | 6,681,307 | Shares | Sole | 2026-05-15 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $1,014,574 | 8.70% | 1,217,976 | Shares | Defined | 2026-05-15 | ||||
| Mid MPM BIOIMPACT LLC | $1,006,938 | 8.63% | 1,208,810 | Shares | Sole | 2026-05-15 | ||||
| Small Lynx1 Capital Management LP | $547,935 | 4.70% | 657,786 | Shares | Other | 2026-05-04 | ||||
| Small SPHERA FUNDS MANAGEMENT LTD. | $522,132 | 4.48% | 626,810 | Shares | Defined | 2026-05-15 | ||||
| Micro DC Funds, LP | $490,721 | 4.21% | 589,102 | Shares | Sole | 2026-05-14 | ||||
| Small Squadron Capital Management LLC | $469,424 | 4.03% | 563,535 | Shares | Sole | 2026-05-15 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $430,009 | 3.69% | 516,218 | Shares | Sole | 2026-05-14 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $324,441 | 2.78% | 389,487 | Shares | Defined | 2026-05-15 | ||||
| Mega BANK OF AMERICA CORP /DE/ Bank | $220,397 | 1.89% | 264,583 | Shares | Defined | 2026-05-18 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $131,385 | 1.13% | 157,726 | Shares | Defined | 2026-05-08 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $109,997 | 0.94% | 132,050 | Shares | Sole | 2026-05-15 | ||||
| Mega STATE STREET CORP | $99,266 | 0.85% | 119,168 | Shares | Defined | 2026-05-15 | ||||
| Mega BlackRock, Inc. | $84,638 | 0.73% | 101,608 | Shares | Sole | 2026-05-13 | ||||
| Mega NORTHERN TRUST CORP Bank | $72,346 | 0.62% | 86,851 | Shares | Defined | 2026-05-14 | ||||
| Large Alyeska Investment Group, L.P. | $72,099 | 0.62% | 86,554 | Shares | Sole | 2026-05-15 | ||||
| Mega JANE STREET GROUP, LLC | $69,002 | 0.59% | 82,836 | Shares | Defined | 2026-05-12 | ||||
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | $64,141 | 0.55% | 77,000 | Shares | Sole | 2026-05-15 | ||||
| Mega UBS Group AG | $55,691 | 0.48% | 66,857 | Shares | Defined | 2026-05-05 | ||||
| Mid XTX Topco Ltd | $42,423 | 0.36% | 50,929 | Shares | Defined | 2026-05-15 | ||||
| Mega GOLDMAN SACHS GROUP INC | $31,875 | 0.27% | 38,266 | Shares | Defined | 2026-05-15 | ||||
| Mega MORGAN STANLEY | $28,153 | 0.24% | 33,799 | Shares | Defined | 2026-05-15 | ||||
| Mid SIMPLEX TRADING, LLC | $27,094 | 0.23% | 32,526 | Shares | Sole | 2026-05-14 | ||||
| Micro Verdad Advisers, LP | $24,790 | 0.21% | 29,760 | Shares | Sole | 2026-05-15 | ||||
| Mega RAYMOND JAMES FINANCIAL INC | $16,475 | 0.14% | 19,778 | Shares | Defined | 2026-05-14 | ||||
| Large HRT FINANCIAL LP | $14,878 | 0.13% | 17,861 | Shares | Defined | 2026-05-14 | ||||
| Mid CERTUITY, LLC | $12,495 | 0.11% | 15,000 | Shares | Sole | 2026-05-11 | ||||
| Small Delta Investment Management, LLC | $12,432 | 0.11% | 14,925 | Shares | Sole | 2026-05-13 | ||||
| Mega BARCLAYS PLC | $11,024 | 0.09% | 13,235 | Shares | Defined | 2026-05-15 | ||||
| Small HBK Sorce Advisory LLC | $11,018 | 0.09% | 13,227 | Shares | Sole | 2026-05-11 | ||||
| Mid Larson Financial Group LLC | $10,872 | 0.09% | 13,052 | Shares | Sole | 2026-05-15 | ||||
| Small Ranch Capital Advisors Inc. | $9,996 | 0.09% | 12,000 | Shares | Sole | 2026-05-06 | ||||
| Mega CITADEL ADVISORS LLC | $8,648 | 0.07% | 10,382 | Shares | Defined | 2026-05-15 | ||||
| Mega Vanguard Global Advisers, LLC | $8,615 | 0.07% | 10,343 | Shares | Defined | 2026-05-08 | ||||
| Large Cetera Investment Advisers | $8,496 | 0.07% | 10,200 | Shares | Sole | 2026-05-13 | ||||
| Mega LPL Financial LLC | $8,330 | 0.07% | 10,000 | Shares | Sole | 2026-05-06 | ||||
| Large OSAIC HOLDINGS, INC. | $7,183 | 0.06% | 8,625 | Shares | Defined | 2026-05-15 | ||||
| Small Financial Perspectives, Inc | $5,622 | 0.05% | 6,750 | Shares | Sole | 2026-05-11 | ||||
| Small TFC Financial Management, Inc. | $3,748 | 0.03% | 4,500 | Shares | Sole | 2026-04-23 | ||||
| Mega CITIGROUP INC | $2,818 | 0.02% | 3,384 | Shares | Defined | 2026-05-11 | ||||
| Mega JPMORGAN CHASE & CO | $1,745 | 0.01% | 2,096 | Shares | Defined | 2026-05-13 | ||||
| Mid GROUP ONE TRADING LLC | $1,558 | 0.01% | 1,871 | Shares | Sole | 2026-05-13 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $658 | 0.01% | 790 | Shares | Defined | 2026-05-12 | ||||
| Large NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | $166 | 0.00% | 200 | Shares | Defined | 2026-05-07 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $66 | 0.00% | 80 | Shares | Defined | 2026-04-28 | ||||
| Mega FMR LLC | $32 | 0.00% | 39 | Shares | Defined | 2026-05-15 | ||||
| Mid Optiver Holding B.V. | $18 | 0.00% | 22 | Shares | Defined | 2026-05-15 | ||||
| Mid Arax Advisory Partners | $9 | 0.00% | 12 | Shares | Sole | 2026-05-13 | ||||
| No holders match your search. | ||||||||||