Sellas Life Sciences Group Inc
Ownership
Ownership Structure
Who owns Sellas Life Sciences Group Inc (SLS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.6% of the shares are freely tradable; institutional investors hold 27.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 6.04 | 12,198,410 | +61.8 | 03/31/2026 |
| State Street Corp | 4.16 | 8,396,356 | +283.7 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.73 | 7,525,929 | +0.0 | 03/31/2026 |
| Anson Funds Management LP | 2.23 | 4,500,000 | +0.0 | 06/30/2026 |
| Geode Capital Management, LLC | 1.94 | 3,912,606 | +27.1 | 03/31/2026 |
| Marshall Wace Asset Management Ltd | 1.01 | 2,037,162 | +52.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| State Street® SPDR® S&P® Biotech ETF | 4.51 | 9,116,009 | -1.1 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 2.94 | 5,928,577 | +0.3 | 07/31/2026 |
| iShares Russell 2000 ETF | 2.40 | 4,854,299 | -0.6 | 08/31/2026 |
| Vanguard Institutional Extnd Mkt Idx Tr | 1.06 | 2,146,131 | +0.6 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.