Who owns HOWL?
Institutional ownership of Werewolf Therapeutics Inc. from Form 13F, Q2 2026
45 institutional managers reported holding Werewolf Therapeutics Inc. (HOWL) in Form 13F filings for Q2 2026, with 10,864,466 shares worth $3.9M. The largest reported holder was Ra Capital Management, L.p. Managers that filed both quarters added a net 3,545,857 shares (+48.4%). 10 opened new positions and 12 sold out.
- Funds holding
- 45
- Value held
- $3.9M
- New / sold out
- 10 / 12
- Net shares, same filers
- +48.4%
Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
Largest holders of HOWL
| Fund | Value | Share of 13F holdings | Shares | Move |
|---|---|---|---|---|
| Ra Capital Management, L.p. | $859K | 22.0% | 2,387,744 | New |
| Balyasny Asset Management L.P. | $644K | 16.5% | 1,790,089 | New |
| Vanguard Capital Management LLC | $438K | 11.2% | 1,217,976 | Unchanged |
| Renaissance Technologies LLC | $243K | 6.2% | 674,632 | Added |
| Lynx1 Capital Management LP | $237K | 6.1% | 657,786 | Unchanged |
| Sphera Funds Management LTD. | $226K | 5.8% | 626,810 | Unchanged |
| DC Funds, LP | $212K | 5.4% | 589,102 | Unchanged |
| Verdad Advisers, LP | $126K | 3.2% | 348,709 | Added |
| Geode Capital Management, LLC | $121K | 3.1% | 335,815 | Trimmed |
| Bank of America Corp | $112K | 2.9% | 311,502 | Added |
| XTX Topco Ltd | $98K | 2.5% | 271,478 | Added |
| Jane Street Group, LLC | $91K | 2.3% | 251,837 | Added |
| UBS Group AG | $78K | 2.0% | 215,838 | Added |
| Vanguard Fiduciary Trust Co | $57K | 1.5% | 157,726 | Unchanged |
| State Street Corp | $43K | 1.1% | 119,168 | Unchanged |
| Squarepoint Ops LLC | $37K | 1.0% | 103,242 | New |
| BlackRock, Inc. | $37K | 0.9% | 101,573 | Unchanged |
| Rangeley Capital, LLC | $36K | 0.9% | 100,000 | New |
| Northern Trust Corp | $31K | 0.8% | 86,851 | Unchanged |
| Alyeska Investment Group, L.P. | $31K | 0.8% | 86,554 | Unchanged |
| MPM Bioimpact LLC | $29K | 0.7% | 80,142 | Trimmed |
| Millennium Management LLC | $22K | 0.6% | 62,055 | Trimmed |
| Virtu Financial LLC | $16K | 0.4% | 45,467 | New |
| Gsa Capital Partners LLP | $10K | 0.2% | 27,146 | New |
| Two Sigma Investments, LP | $10K | 0.3% | 27,300 | New |
Share of 13F holdings is each fund's shares as a share of the 10,864,466 HOWL shares all 13F filers reported, not of shares outstanding.
Biggest buyers in Q2 2026
- Ra Capital Management, L.p. New+$859K
- Balyasny Asset Management L.P. New+$644K
- Verdad Advisers, LP Added+$115K
- XTX Topco Ltd Added+$79K
- Jane Street Group, LLC Added+$61K
- Renaissance Technologies LLC Added+$57K
- UBS Group AG Added+$54K
- Squarepoint Ops LLC New+$37K
- Rangeley Capital, LLC New+$36K
- Bank of America Corp Added+$17K
Biggest sellers in Q2 2026
- Squadron Capital Management LLC Sold out-$469K
- MPM Bioimpact LLC Trimmed-$406K
- Bridgeway Capital Management, LLC Sold out-$64K
- Millennium Management LLC Trimmed-$25K
- Geode Capital Management, LLC Trimmed-$19K
- Raymond James Financial Inc Sold out-$16K
- HRT Financial LP Sold out-$14K
- Delta Investment Management, LLC Sold out-$12K
- Simplex Trading, LLC Trimmed-$12K
- Citadel Advisors LLC Sold out-$9K
The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $2.0M and sold $1.1M; 9 added and 7 trimmed.
Schedule 13D and 13G filings on HOWL
Owners of more than 5% must file within days, so these can be newer than the 13F data.
- 2026-09-21MOLL PETER SCHEDULE 13G filed by Werewolf Therapeutics Inc.Schedule 13G
Questions about HOWL ownership
- Who owns HOWL stock?
- 45 institutional investment managers reported HOWL positions in their Form 13F filings for Q2 2026, holding 10,864,466 shares worth $3.9M in total. Ra Capital Management, L.p. reported the largest position.
- Are funds buying or selling HOWL?
- In Q2 2026, 10 managers opened new HOWL positions, 9 added, 7 trimmed and 12 sold out. Managers that filed in both quarters added a net 3,545,857 shares.
- How current is this HOWL institutional ownership data?
- It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to HOWL by CUSIP. Options are left out. HOWL news and filings · HOWL insider trades · Top funds