Werewolf Therapeutics, Inc. (HOWL) — Institutional Holders, Q2 2026
45 institutional investment managers reported a HOWL position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $3.9M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
HOWL in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- BALYASNY ASSET MANAGEMENT L.P.New · +1,790,089 sh+$644.3K
- Verdad AdvisersAdded · +318,949 sh+$114.8K
- XTX Topco LtdAdded · +220,549 sh+$79.4K
- JANE STREET GROUPAdded · +169,001 sh+$60.8K
- RENAISSANCE TECHNOLOGIESAdded · +158,414 sh+$57.0K
Biggest sellers
- RA CAPITAL MANAGEMENT, L.P.Trimmed · -4,293,563 sh-$1.5M
- MPM BioImpactTrimmed · -1,128,668 sh-$406.2K
- Squadron Capital ManagementSold out · -563,535 sh-$202.8K
- BRIDGEWAY CAPITAL MANAGEMENTSold out · -77,000 sh-$27.7K
- MILLENNIUM MANAGEMENTTrimmed · -69,995 sh-$25.2K
HOWL 13F holders ranked 1–45 of 45
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P.#1 · 2,387,744 sh | 2,387,744 | $859.3K | <0.01% | -64.3% |
| 2 | BALYASNY ASSET MANAGEMENT L.P.#2 · 1,790,089 sh | 1,790,089 | $644.3K | <0.01% | New |
| 3 | VANGUARD CAPITAL MANAGEMENT#3 · 1,217,976 sh | 1,217,976 | $438.5K | 0.00% | 0.0% |
| 4 | RENAISSANCE TECHNOLOGIES#4 · 674,632 sh | 674,632 | $242.8K | <0.01% | +30.7% |
| 5 | Lynx1 Capital Management#5 · 657,786 sh | 657,786 | $236.7K | 0.05% | 0.0% |
| 6 | SPHERA FUNDS MANAGEMENT LTD.#6 · 626,810 sh | 626,810 | $225.6K | 0.03% | 0.0% |
| 7 | DC Funds#7 · 589,102 sh | 589,102 | $212.0K | 16.92% | 0.0% |
| 8 | Verdad Advisers#8 · 348,709 sh | 348,709 | $125.5K | 0.12% | +1071.7% |
| 9 | GEODE CAPITAL MANAGEMENT#9 · 335,815 sh | 335,815 | $120.9K | 0.00% | -13.8% |
| 10 | BANK OF AMERICA#10 · 311,502 sh | 311,502 | $111.8K | 0.00% | +17.7% |
| 11 | XTX Topco Ltd#11 · 271,478 sh | 271,478 | $97.7K | <0.01% | +433.1% |
| 12 | JANE STREET GROUP#12 · 251,837 sh | 251,837 | $90.6K | 0.00% | +204.0% |
| 13 | UBS Group AG#13 · 215,838 sh | 215,838 | $77.7K | 0.00% | +222.8% |
| 14 | VANGUARD FIDUCIARY#14 · 157,726 sh | 157,726 | $56.8K | 0.00% | 0.0% |
| 15 | STATE STREET#15 · 119,168 sh | 119,168 | $42.9K | 0.00% | 0.0% |
| 16 | Squarepoint Ops#16 · 103,242 sh | 103,242 | $37.2K | 0.00% | New |
| 17 | BlackRock#17 · 101,573 sh | 101,573 | $36.6K | 0.00% | 0.0% |
| 18 | Rangeley Capital#18 · 100,000 sh | 100,000 | $36.0K | 0.03% | New |
| 19 | NORTHERN#19 · 86,851 sh | 86,851 | $31.3K | 0.00% | 0.0% |
| 20 | Alyeska Investment Group, L.P.#20 · 86,554 sh | 86,554 | $31.2K | <0.01% | 0.0% |
| 21 | MPM BioImpact#21 · 80,142 sh | 80,142 | $28.9K | <0.01% | -93.4% |
| 22 | MILLENNIUM MANAGEMENT#22 · 62,055 sh | 62,055 | $22.3K | 0.00% | -53.0% |
| 23 | Virtu Financial#23 · 45,467 sh | 45,467 | $16.0K | <0.01% | New |
| 24 | GSA CAPITAL PARTNERS LLP#24 · 27,146 sh | 27,146 | $10.0K | <0.01% | New |
| 25 | TWO SIGMA INVESTMENTS#25 · 27,300 sh | 27,300 | $9.8K | 0.00% | New |
| 26 | StoneX Group#26 · 20,000 sh | 20,000 | $9.0K | <0.01% | New |
| 27 | GOLDMAN SACHS GROUP#27 · 20,023 sh | 20,023 | $7.2K | 0.00% | -47.7% |
| 28 | MORGAN STANLEY#28 · 19,108 sh | 19,108 | $6.9K | 0.00% | -43.5% |
| 29 | CERTUITY#29 · 15,000 sh | 15,000 | $5.4K | <0.01% | 0.0% |
| 30 | HBK Sorce Advisory#30 · 13,227 sh | 13,227 | $5.3K | <0.01% | 0.0% |
| 31 | BARCLAYS PLC#31 · 13,235 sh | 13,235 | $4.8K | 0.00% | 0.0% |
| 32 | Larson Financial Group#32 · 13,052 sh | 13,052 | $4.7K | <0.01% | 0.0% |
| 33 | LPL Financial#33 · 11,791 sh | 11,791 | $4.2K | 0.00% | +17.9% |
| 34 | Ranch Capital Advisors#34 · 11,000 sh | 11,000 | $4.0K | <0.01% | -8.3% |
| 35 | Marest Capital#35 · 10,870 sh | 10,870 | $3.9K | — | New |
| 36 | Cetera Investment Advisers#36 · 10,200 sh | 10,200 | $3.7K | 0.00% | 0.0% |
| 37 | Tower Research Capital (TRC)#37 · 9,897 sh | 9,897 | $3.6K | <0.01% | New |
| 38 | OSAIC#38 · 8,625 sh | 8,625 | $3.1K | 0.00% | 0.0% |
| 39 | Financial Perspectives#39 · 6,750 sh | 6,750 | $2.4K | <0.01% | 0.0% |
| 40 | GROUP ONE TRADING, L.P.#40 · 1,871 sh | 1,871 | $673.00 | 0.00% | 0.0% |
| 41 | JPMORGAN CHASE#41 · 2,108 sh | 2,108 | $650.00 | 0.00% | +0.6% |
| 42 | BNP PARIBAS FINANCIAL MARKETS#42 · 790 sh | 790 | $284.00 | 0.00% | 0.0% |
| 43 | SIMPLEX TRADING#43 · 255 sh | 255 | $91.00 | 0.00% | -99.2% |
| 44 | SBI Securities , Ltd.#44 · 100 sh | 100 | $36.00 | — | +25.0% |
| 45 | Optiver Holding B.V.#45 · 22 sh | 22 | $8.00 | 0.00% | 0.0% |
Funds that sold out of HOWL in Q2 2026 (12)
Held HOWL at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Squadron Capital Management563,535 sh | 563,535 | $469.2K |
| BRIDGEWAY CAPITAL MANAGEMENT77,000 sh | 77,000 | $64.1K |
| RAYMOND JAMES FINANCIAL19,778 sh | 19,778 | $16.5K |
| HRT FINANCIAL17,861 sh | 17,861 | $14.0K |
| Delta Investment Management14,925 sh | 14,925 | $12.4K |
| CITADEL ADVISORS10,382 sh | 10,382 | $8.6K |
| Vanguard Global Advisers10,343 sh | 10,343 | $8.6K |
| TFC Financial Management4,500 sh | 4,500 | $3.7K |
| CITIGROUP3,384 sh | 3,384 | $2.8K |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT200 sh | 200 | $167.00 |
| SRS Capital Advisors12 sh | 12 | $32.00 |
| FMR39 sh | 39 | $32.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.