SELLAS Life Sciences Group, Inc. (SLS) ownership: Top institutional holder: BlackRock, Inc. ($51.60M). Insider activity: Net Seller (4 buys, 16 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 12198410.00 | $51.60M | 2026-03-31 |
| STATE STREET CORP | 8396356.00 | $35.52M | 2026-03-31 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 7624100.00 | $32.25M | 2026-03-31 |
| VANGUARD GROUP INC | 8467400.00 | $31.92M | 2025-12-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 7525929.00 | $31.83M | 2026-03-31 |
| CITADEL ADVISORS LLC | 4368200.00 | $18.48M | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 3912606.00 | $16.55M | 2026-03-31 |
| MARSHALL WACE, LLP | 2037162.00 | $8.62M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-16 | |
| Sell | null | 2026-01-07 | |
| Sell | null | 2026-01-07 | |
| Sell | null | 2026-01-07 | |
| Sell | null | 2026-01-07 | |
| Sell | null | 2026-01-07 | |
| Sell | null | 2026-01-07 | |
| Sell | null | 2026-01-07 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.