Werewolf TherapeuticsHOWL
13F holders, Q1 2026 (March 31)At the end of Q1 2026, 48 institutions reported holding Werewolf Therapeutics Inc. (HOWL) in their 13F filings, down 3 from Q4 2025. 7 opened new positions and 11 sold out. The largest holders were Ra Capital Management, L.P. ($5.6M), Vanguard Capital Management LLC ($1.0M) and MPM Bioimpact LLC ($1.0M). 3 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Werewolf Therapeutics Inc.
- CUSIP
- 95075A107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 7 | $584K |
| Exits | 11 | $200K |
All 13F filers, Q4 2025 → Q1 2026: 780,163 shares bought and 1,483,216 shares sold, net −703,053 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 48 holders
| Ra Capital Management, L.P. | 0.06% | No change | 6,681,307 | $5.6M |
| Vanguard Capital Management LLC | 0.00% | — | 1,217,976 | $1.0M |
| MPM Bioimpact LLC | 0.08% | Reduce -13.3% | 1,208,810 | $1.0M |
| Lynx1 Capital Management LP | 0.09% | Add +0.3% | 657,786 | $548K |
| Sphera Funds Management LTD. | 0.09% | No change | 626,810 | $522K |
| DC Funds, LP | 33.01% | No change | 589,102 | $490K |
| Squadron Capital Management LLC | 0.19% | New | 563,535 | $469K |
| Renaissance Technologies | 0.00% | Reduce -23.8% | 516,218 | $430K |
| Geode Capital Management, LLC | 0.00% | Add +16.0% | 389,487 | $324K |
| Bank of America Corp. | 0.00% | Reduce -64.1% | 264,583 | $220K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 157,726 | $131K |
| Millennium Management | 0.00% | Reduce -45.0% | 132,050 | $110K |
| State Street Corp. | 0.00% | No change | 119,168 | $99K |
| BlackRock, Inc. | 0.00% | Reduce -0.0% | 101,608 | $85K |
| Northern Trust Corp. | 0.00% | No change | 86,851 | $72K |
| Alyeska Investment Group, L.P. | 0.00% | Reduce -63.3% | 86,554 | $72K |
| Jane Street Group, LLC | 0.00% | Reduce -47.4% | 82,836 | $69K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 77,000 | $64K |
| UBS Group AG | 0.00% | Add +10.1% | 66,857 | $56K |
| XTX Topco Ltd | 0.00% | New | 50,929 | $42K |
| Goldman Sachs Group Inc. | 0.00% | Add +12.3% | 38,266 | $32K |
| Morgan Stanley | 0.00% | Reduce -26.5% | 33,799 | $28K |
| Simplex Trading, LLC | 0.00% | Add +35.2% | 32,526 | $27K |
| Verdad Advisers, LP | 0.03% | New | 29,760 | $25K |
| Raymond James Financial Inc. | 0.00% | New | 19,778 | $16K |
| HRT Financial LP | 0.00% | New | 17,861 | $14K |
| Certuity, LLC | 0.00% | No change | 15,000 | $12K |
| Delta Investment Management, LLC | 0.00% | No change | 14,925 | $12K |
| Barclays PLC | 0.00% | Reduce -0.0% | 13,235 | $11K |
| Larson Financial Group LLC | 0.00% | No change | 13,052 | $11K |
| Ranch Capital Advisors Inc. | 0.00% | No change | 12,000 | $10K |
| HBK Sorce Advisory LLC | 0.00% | No change | 13,227 | $9K |
| Citadel Advisors | 0.00% | New | 10,382 | $9K |
| Vanguard Global Advisers, LLC | 0.00% | — | 10,343 | $9K |
| Cetera Investment Advisers | 0.00% | No change | 10,200 | $8K |
| LPL Financial LLC | 0.00% | New | 10,000 | $8K |
| Osaic Holdings, Inc. | 0.00% | No change | 8,625 | $7K |
| Financial Perspectives, Inc | 0.00% | No change | 6,750 | $6K |
| TFC Financial Management, Inc. | 0.00% | No change | 4,500 | $4K |
| Citigroup Inc. | 0.00% | Add +338300.0% | 3,384 | $3K |
| JPMorgan Chase & Co. | 0.00% | Add +1.2% | 2,096 | $2K |
| Group One Trading LLC | 0.00% | No change | 1,871 | $2K |
| BNP Paribas Financial Markets | 0.00% | Reduce -0.3% | 790 | $658 |
| Northwestern Mutual Wealth Management Co. | 0.00% | Add +4900.0% | 200 | $167 |
| SBI Securities Co., Ltd. | 0.00% | Add +100.0% | 80 | $67 |
| FMR LLC | 0.00% | Reduce -98.9% | 39 | $32 |
| Arax Advisory Partners | 0.00% | Reduce -69.2% | 12 | $32 |
| Optiver Holding B.V. | 0.00% | No change | 22 | $18 |
"% of holder's portfolio" is HOWL's weight in each manager's 13F, not the share of Werewolf Therapeutics Inc. the manager owns.