Latest Period
Q4 2025
Security Snapshot
SELLAS Life Sciences Group, Inc. - Common Stock (SLS) Institutional Ownership
CUSIP: 81642T209
13F Institutional Holders and Ownership History from Q4 2019 to Q1 2026
Institutions Reporting
111
Shares (Excl. Options)
35,489,410
Price
$3.77
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- Type / Class
- Equity / Common Stock
- Symbol
- SLS on Nasdaq
- Shares outstanding
- 178,475,456
- Price per share
- $4.76
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 35,489,410
- Total reported value
- $133,847,686
- % of total 13F portfolios
- 0%
- Share change
- +2,504,475
- Value change
- +$23,683,756
- Number of holders
- 111
- Price from insider filings
- $4.76
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- SLS - SELLAS Life Sciences Group, Inc. - Common Stock is tracked under CUSIP 81642T209.
- 111 institutions reported positions in Q4 2025.
- 3 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 111 to 49 between Q4 2025 and Q1 2026.
- Reported value moved from $133,847,686 to $15,829,930.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 111 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 81642T209?
CUSIP 81642T209 identifies SLS - SELLAS Life Sciences Group, Inc. - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 81642T209:
Significant Owners of SELLAS Life Sciences Group, Inc. - Common Stock (SLS) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 6.8% | +28% | $51,336,680 | +$27,281,152 | 12,136,331 | +113% | BlackRock, Inc. | 31 Mar 2026 |
| Anson Funds Management LP | 4.9% | -13% | $31,046,889 | +$6,010,196 | 7,481,178 | +24% | Anson Funds Management LP | 31 Dec 2025 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | 3.7% | $24,560,261 | 6,514,658 | Highbridge Capital Management, LLC | 31 Dec 2025 |
As of 31 Dec 2025, 111 institutional investors reported holding 35,489,410 shares of SELLAS Life Sciences Group, Inc. - Common Stock (SLS). This represents 20% of the company’s total 178,475,456 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of SELLAS Life Sciences Group, Inc. - Common Stock (SLS) together control 19% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| VANGUARD GROUP INC | 4.7% | 8,467,400 | +24% | 0% | $31,922,098 |
| BlackRock, Inc. | 4.2% | 7,541,054 | +33% | 0% | $28,429,774 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.7% | 3,077,337 | +36% | 0% | $11,604,041 |
| STATE STREET CORP | 1.2% | 2,188,171 | +61% | 0% | $8,249,405 |
| MILLENNIUM MANAGEMENT LLC | 0.78% | 1,387,849 | +341% | 0% | $5,232,191 |
| MARSHALL WACE, LLP | 0.75% | 1,340,668 | -43% | 0% | $5,054,320 |
| TWO SIGMA INVESTMENTS, LP | 0.61% | 1,082,207 | +642% | 0.01% | $4,079,920 |
| Nuveen, LLC | 0.57% | 1,023,961 | +2.6% | 0% | $3,860,333 |
| NORTHERN TRUST CORP | 0.52% | 930,750 | +27% | 0% | $3,508,927 |
| MORGAN STANLEY | 0.5% | 890,929 | -16% | 0% | $3,358,802 |
| DAGCO, INC. | 0.32% | 577,540 | 0.5% | $2,177,326 | |
| BARCLAYS PLC | 0.29% | 511,034 | +180% | 0% | $1,926,599 |
| Clear Street Group Inc. | 0.28% | 500,000 | 0.01% | $1,885,000 | |
| Everhart Financial Group, Inc. | 0.26% | 466,216 | +41% | 0.16% | $1,757,634 |
| JONES FINANCIAL COMPANIES LLLP | 0.24% | 429,243 | +114671% | 0% | $1,618,246 |
| GOLDMAN SACHS GROUP INC | 0.23% | 411,654 | +2037% | 0% | $1,551,936 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.23% | 408,401 | +39% | 0% | $1,539,672 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.2% | 349,755 | -59% | 0% | $1,318,577 |
| GSA CAPITAL PARTNERS LLP | 0.19% | 345,052 | -34% | 0.11% | $1,301,000 |
| Opus Capital Group, LLC | 0.18% | 317,100 | +27% | 0.13% | $1,195,000 |
| WELLS FARGO & COMPANY/MN | 0.17% | 299,305 | +295% | 0% | $1,128,380 |
| Bank of New York Mellon Corp | 0.14% | 256,409 | +25% | 0% | $966,663 |
| Mariner, LLC | 0.09% | 159,150 | +46% | 0% | $599,996 |
| RHUMBLINE ADVISERS | 0.07% | 129,309 | -5.4% | 0% | $487,489 |
| XTX Topco Ltd | 0.07% | 118,440 | 0.01% | $446,519 |
Institutional Holders of SELLAS Life Sciences Group, Inc. - Common Stock (SLS) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 3,737,551 | $15,829,930 | +$3,130,315 | $4.23 | 49 |
| 2025 Q4 | 35,489,410 | $133,847,686 | +$23,683,756 | $3.77 | 111 |
| 2025 Q3 | 32,917,301 | $53,012,951 | +$9,796,863 | $1.61 | 92 |
| 2025 Q2 | 26,771,579 | $58,629,839 | +$27,498,028 | $2.19 | 78 |
| 2025 Q1 | 14,287,843 | $15,431,614 | +$8,743,246 | $1.08 | 43 |
| 2024 Q4 | 6,195,241 | $6,443,955 | +$751,049 | $1.04 | 29 |
| 2024 Q3 | 5,385,570 | $6,729,539 | +$1,661,405 | $1.25 | 30 |
| 2024 Q2 | 4,056,846 | $4,828,846 | -$3,466,325 | $1.19 | 29 |
| 2024 Q1 | 7,717,105 | $7,794,727 | +$4,207,509 | $1.01 | 27 |
| 2023 Q4 | 3,493,044 | $3,702,505 | +$352,826 | $1.06 | 29 |
| 2023 Q3 | 2,751,676 | $4,512,830 | -$594,241 | $1.64 | 25 |
| 2023 Q2 | 3,114,137 | $4,889,035 | +$175,383 | $1.57 | 22 |
| 2023 Q1 | 2,996,127 | $4,284,993 | +$1,438,716 | $1.43 | 20 |
| 2022 Q4 | 1,889,269 | $4,456,259 | +$91,291 | $2.36 | 27 |
| 2022 Q3 | 2,186,943 | $4,418,000 | -$1,738,313 | $2.02 | 25 |
| 2022 Q2 | 2,979,307 | $6,641,000 | +$1,671,317 | $2.23 | 23 |
| 2022 Q1 | 1,688,629 | $11,276,000 | -$279,247 | $6.68 | 25 |
| 2021 Q4 | 1,733,782 | $9,586,000 | -$1,340,161 | $5.53 | 26 |
| 2021 Q3 | 1,859,470 | $17,100,000 | -$844,204 | $9.16 | 29 |
| 2021 Q2 | 1,897,926 | $21,282,000 | +$4,739,163 | $11.10 | 28 |
| 2021 Q1 | 1,552,743 | $13,246,990 | +$5,287,808 | $8.54 | 28 |
| 2020 Q4 | 925,075 | $5,374,000 | +$2,503,596 | $5.81 | 17 |
| 2020 Q3 | 616,674 | $1,633,000 | +$397,179 | $2.65 | 10 |
| 2020 Q2 | 455,904 | $1,335,000 | +$144,563 | $2.93 | 12 |
| 2020 Q1 | 415,637 | $720,000 | -$87,849 | $1.74 | 10 |
| 2019 Q4 | 389,002 | $1,672,000 | +$1,672,000 | $4.30 | 9 |