Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in HOWL held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | 6.7M | $5.6M | 0.0% | 13.748% | 0.06% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 1.2M | $1.0M | β | 2.506% | 0.00% |
| 3 | MPM Oncology Impact Management LP | 1.2M | $1.0M | -13.3% | 2.487% | 0.08% |
| 4 | Lynx1 Capital Management LP | 658K | $548K | +0.3% | 1.354% | 0.09% |
| 5 | SPHERA FUNDS MANAGEMENT LTD. | 627K | $522K | 0.0% | 1.290% | 0.09% |
| 6 | DC Funds, LP | 589K | $490K | 0.0% | 1.212% | 33.01% |
| 7 | Squadron Capital Management LLC | 564K | $469K | β | 1.160% | 0.19% |
| 8 | RENAISSANCE TECHNOLOGIES LLC | 516K | $430K | -23.8% | 1.062% | 0.00% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 389K | $324K | +16.0% | 0.801% | 0.00% |
| 10 | BANK OF AMERICA CORP /DE/ | 265K | $220K | -64.1% | 0.544% | 0.00% |
| 11 | VANGUARD FIDUCIARY TRUST CO | 158K | $131K | β | 0.325% | 0.00% |
| 12 | MILLENNIUM MANAGEMENT LLC | 132K | $110K | -45.0% | 0.272% | 0.00% |
| 13 | STATE STREET CORP | 119K | $99K | 0.0% | 0.245% | 0.00% |
| 14 | BlackRock, Inc. | 102K | $85K | -0.0% | 0.209% | 0.00% |
| 15 | NORTHERN TRUST CORP | 87K | $72K | 0.0% | 0.179% | 0.00% |
| 16 | Alyeska Investment Group, L.P. | 87K | $72K | -63.3% | 0.178% | 0.00% |
| 17 | JANE STREET GROUP, LLC | 83K | $69K | -47.3% | 0.170% | 0.00% |
| 18 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 77K | $64K | 0.0% | 0.158% | 0.00% |
| 19 | UBS Group AG | 67K | $56K | +10.1% | 0.138% | 0.00% |
| 20 | XTX Topco Ltd | 51K | $42K | β | 0.105% | 0.00% |
| 21 | GOLDMAN SACHS GROUP INC | 38K | $32K | +12.3% | 0.079% | 0.00% |
| 22 | MORGAN STANLEY | 34K | $28K | -26.5% | 0.069% | 0.00% |
| 23 | SIMPLEX TRADING, LLC | 33K | $27K | +35.2% | 0.067% | 0.00% |
| 24 | Verdad Advisers, LP | 30K | $25K | β | 0.061% | 0.03% |
| 25 | RAYMOND JAMES FINANCIAL INC | 20K | $16K | β | 0.041% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in HOWL β a direct measure of their conviction.
Filings activity in HOWL during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new HOWL position in Q1 2026
Institutions that fully closed their HOWL position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 47 | 6.0% | 62.86% | +12.44 pp | $12M | +25% |
| Q4 2025 | 50 | 19% | 50.42% | 149.57 pp | $9M | 77% |
| Q3 2025 | 62 | 6.1% | 199.99% | +69.26 pp | $41M | +71% |
| Q2 2025 | 66 | 7.0% | 130.73% | 11.80 pp | $24M | 8.3% |
| Q1 2025 | 71 | 2.7% | 142.53% | 57.46 pp | $26M | 36% |
| Q4 2024 | 73 | +7.4% | 199.99% | +0.00 pp | $41M | 39% |
| Q3 2024 | 68 | 2.9% | 199.99% | +0.00 pp | $67M | 13% |
| Q2 2024 | 70 | β | 199.99% | β | $77M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying HOWL stock.
Based on Q1 2026 13F filings, institutional ownership of Werewolf Therapeutics, Inc. stands at 62.9%, held across 47 reporting institutions.
RA CAPITAL MANAGEMENT, L.P. is the largest reported institutional holder of HOWL, with approximately 6,681,307 shares worth $0.01B as of Q1 2026.
Yes β 3 widely-followed marquee investors appear among the top 25 institutional holders of HOWL, including RENAISSANCE TECHNOLOGIES LLC, MILLENNIUM MANAGEMENT LLC, JANE STREET GROUP, LLC.
Our composite Smart Money Score for HOWL is 65 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
11 institutions opened new positions in HOWL during Q1 2026, while 14 fully exited. 30 added to existing positions and 6 trimmed.
HOWL institutional ownership rose by 12.44 percentage points quarter-over-quarter, with a net change of -3 holders.
The top 10 institutions account for 91.0% of all reported 13F value in HOWL, and the top 25 account for 99.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Werewolf Therapeutics, Inc. (HOWL) Institutional Ownership