SELLAS Life Sciences Group, Inc.
SLS- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001390478
No open-market purchases or sales by SELLAS Life Sciences Group, Inc. insiders were filed in the last 90 days; 193 institutions reported holding it in 13F filings for Q2 2026, worth $1.08B in total; no superinvestor holds it.
Holders of 5% or more of SLS
Holders whose latest Schedule 13D or 13G filing reports 5% or more of SELLAS Life Sciences Group, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G | 5.40%5.69M shares | New | Oct 17, 20251 filing | Oct 17, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
8 Schedule 13D and 13G filings on SELLAS Life Sciences Group, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 27, 20261:00 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −6.70 ppfrom 6.70%Below 5% | Mar 13, 2026 | SEC |
| Feb 17, 202610:34 AM ET | Anson Funds Management LPand 5 others | 13G/A | 4.90%7.48M shares | −0.80 ppfrom 5.70%Below 5% | Dec 31, 2025 | SEC |
| Jan 30, 20264:15 PM ET | Highbridge Capital Management LLC | 13G/A | 3.70%6.51M shares | –Below 5% | Dec 31, 2025 | SEC |
| Nov 14, 20253:15 PM ET | Anson Funds Management LPand 5 others | 13G | 5.70%6.03M shares | +0.80 ppfrom 4.90% | Sep 30, 2025 | SEC |
| Oct 17, 20256:24 PM ET | BlackRock, Inc. | 13G | 5.40%5.69M shares | New | Sep 30, 2025 | SEC |
| Aug 14, 20259:43 PM ET | Anson Funds Management LPand 5 others | 13G/A | 4.90%5.23M shares | −3.40 ppfrom 8.30%Below 5% | Jun 30, 2025 | SEC |
| Jul 29, 202511:05 AM ET | Vanguard Group Inc | 13G | 6.70%6.69M shares | New | Jun 30, 2025 | SEC |
| May 15, 20254:59 PM ET | Anson Funds Management LPand 5 others | 13G | 8.30%7.58M shares | New | Mar 31, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell SELLAS Life Sciences Group, Inc. shares.
No Form 144 notices for SELLAS Life Sciences Group, Inc. are on file.