Sellas Life Sciences Group ISLS
13F holders, Q1 2025 (March 31)At the end of Q1 2025, 45 institutions reported holding Sellas Life Sciences Group I (SLS) in their 13F filings, up 14 from Q4 2024. 18 opened new positions and 4 sold out. The largest holders were Anson Funds Management LP ($8.2M), Vanguard Group Inc. ($3.1M) and Geode Capital Management, LLC ($886K). 2 famous investors held it, including Ken Griffin (0.0% of Citadel Advisors's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Sellas Life Sciences Group I
- CUSIP
- 81642T209
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2024 → Q1 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 18 | $1.1M |
| Exits | 4 | $74K |
All 13F filers, Q4 2024 → Q1 2025: 8,365,920 shares bought and 272,745 shares sold, net +8,093,175 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 45 holders
| Anson Funds Management LP | 1.98% | Add +535.7% | 7,579,095 | $8.2M |
| Vanguard Group Inc. | 0.00% | Add +23.8% | 2,839,318 | $3.1M |
| Geode Capital Management, LLC | 0.00% | Add +11.8% | 820,440 | $886K |
| Susquehanna International Group, LLP | 0.00% | New | 688,696 | $744K |
| BlackRock, Inc. | 0.00% | Add +21.2% | 538,460 | $582K |
| Citadel Advisors | 0.00% | Reduce -28.0% | 349,505 | $377K |
| State Street Corp. | 0.00% | Add +21.6% | 277,029 | $299K |
| Opus Capital Group, LLC | 0.03% | Add +0.4% | 239,500 | $259K |
| Northern Trust Corp. | 0.00% | Add +22.0% | 164,390 | $178K |
| Morgan Stanley | 0.00% | Add +321.2% | 66,450 | $72K |
| LPL Financial LLC | 0.00% | Add +26.7% | 65,744 | $71K |
| Atom Investors LP | 0.01% | New | 64,216 | $69K |
| UBS Group AG | 0.00% | Reduce -51.3% | 62,231 | $67K |
| Jane Street Group, LLC | 0.00% | Add +375.8% | 58,541 | $63K |
| Virtu Financial LLC | 0.00% | Add +30.9% | 53,861 | $58K |
| Mariner, LLC | 0.00% | Add +1.2% | 51,200 | $55K |
| Two Sigma Investments, LP | 0.00% | New | 48,287 | $52K |
| Renaissance Technologies | 0.00% | New | 34,892 | $38K |
| Jain Global LLC | 0.00% | New | 27,400 | $30K |
| Independent Financial Group, LLC | 0.00% | No change | 23,250 | $25K |
| Gsa Capital Partners LLP | 0.00% | New | 22,727 | $25K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +293.8% | 20,889 | $23K |
| Hudson Bay Capital Management LP | 0.00% | New | 20,660 | $22K |
| Quadrature Capital Ltd | 0.00% | New | 20,673 | $22K |
| Prosperity Financial Group, Inc. | 0.01% | Add +43.5% | 16,500 | $18K |
| Charles Schwab Investment Management Inc. | 0.00% | No change | 16,238 | $18K |
| Grange Capital, LLC | 0.02% | New | 13,501 | $15K |
| Two Sigma Securities, LLC | 0.00% | New | 12,969 | $14K |
| Royal Bank of Canada | 0.00% | Add +6462.5% | 13,125 | $14K |
| Schonfeld Strategic Advisors LLC | 0.00% | New | 12,481 | $13K |
| Equitable Holdings, Inc. | 0.00% | No change | 12,060 | $13K |
| Commonwealth Equity Services, LLC | 0.00% | Add +0.8% | 12,154 | $13K |
| Marshall Wace, LLP | 0.00% | New | 11,482 | $12K |
| Calton & Associates, Inc. | 0.00% | New | 11,000 | $12K |
| Brooklyn FI, LLC | 0.00% | New | 10,140 | $11K |
| Private Wealth Management Group, LLC | 0.00% | New | 10,000 | $11K |
| Nemes Rush Group LLC | 0.00% | No change | 10,000 | $11K |
| SBI Securities Co., Ltd. | 0.00% | Reduce -0.7% | 5,428 | $6K |
| Wells Fargo & Company | 0.00% | New | 3,003 | $3K |
| Osaic Holdings, Inc. | 0.00% | Add +60.2% | 2,660 | $3K |
| Bank of America Corp. | 0.00% | Add +8.7% | 622 | $672 |
| Jones Financial Companies LLLP | 0.00% | No change | 374 | $415 |
| Caldwell Sutter Capital, Inc. | 0.00% | New | 100 | $108 |
| Parkside Financial Bank & Trust | 0.00% | No change | 2 | $3 |
| Avion Wealth | 0.00% | New | 573 | $0 |
"% of holder's portfolio" is SLS's weight in each manager's 13F, not the share of Sellas Life Sciences Group I the manager owns.