Sellas Life Sciences Group ISLS
13F holders, Q1 2026 (March 31)160holders +48
62new positions
15sold out
3famous investors
$4.23avg. 13F price*
At the end of Q1 2026, 160 institutions reported holding Sellas Life Sciences Group I (SLS) in their 13F filings, up 48 from Q4 2025. 62 opened new positions and 15 sold out. The largest holders were BlackRock, Inc. ($51.6M), State Street Corp. ($35.5M) and Vanguard Capital Management LLC ($31.8M). 3 famous investors held it, including Israel Englander (0.0% of Millennium Management's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Cliff Asness (0.0% of AQR Capital Management'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 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 62 | $11.7M |
| Exits | 15 | $3.2M |
All 13F filers, Q4 2025 → Q1 2026: 20,836,857 shares bought and 4,135,344 shares sold, net +16,701,513 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 160 holders
| BlackRock, Inc. | 0.00% | Add +61.8% | 12,198,410 | $51.6M |
| State Street Corp. | 0.00% | Add +283.7% | 8,396,356 | $35.5M |
| Vanguard Capital Management LLC | 0.00% | — | 7,525,929 | $31.8M |
| Geode Capital Management, LLC | 0.00% | Add +27.1% | 3,912,606 | $16.6M |
| Marshall Wace, LLP | 0.01% | Add +52.0% | 2,037,162 | $8.6M |
| Jones Financial Companies LLLP | 0.00% | Add +290.2% | 1,675,077 | $7.3M |
| Vanguard Portfolio Management LLC | 0.00% | — | 1,462,806 | $6.2M |
| Morgan Stanley | 0.00% | Add +50.0% | 1,336,293 | $5.7M |
| Northern Trust Corp. | 0.00% | Add +37.1% | 1,275,984 | $5.4M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 1,202,839 | $5.1M |
| Dagco, Inc. | 0.94% | Add +78.1% | 1,028,780 | $4.4M |
| UBS Group AG | 0.00% | Add +1429.8% | 745,419 | $3.2M |
| Invesco Ltd. | 0.00% | Add +1209.9% | 698,080 | $3.0M |
| Nuveen, LLC | 0.00% | Reduce -34.5% | 670,974 | $2.8M |
| Bank of America Corp. | 0.00% | Add +535.7% | 641,683 | $2.7M |
| Goldman Sachs Group Inc. | 0.00% | Add +35.0% | 555,913 | $2.4M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +17.7% | 480,604 | $2.0M |
| Bank of New York Mellon Corp | 0.00% | Add +86.6% | 478,366 | $2.0M |
| Two Sigma Investments, LP | 0.00% | Reduce -62.8% | 403,165 | $1.7M |
| Susquehanna International Group, LLP | 0.00% | Add +13.5% | 397,056 | $1.7M |
| Everhart Financial Group, Inc. | 0.13% | Reduce -21.8% | 364,397 | $1.5M |
| Opus Capital Group, LLC | 0.16% | Add +9.3% | 346,452 | $1.5M |
| Wellington Management Group LLP | 0.00% | New | 344,778 | $1.5M |
| Vision Financial Markets LLC | 1.26% | New | 304,400 | $1.3M |
| Simplex Trading, LLC | 0.04% | New | 295,162 | $1.2M |
| Rafferty Asset Management, LLC | 0.00% | New | 249,428 | $1.1M |
| Wells Fargo & Company | 0.00% | Reduce -24.6% | 225,707 | $955K |
| Virtu Financial LLC | 0.04% | New | 221,829 | $938K |
| Rhumbline Advisers | 0.00% | Add +50.2% | 194,198 | $821K |
| Vontobel Holding Ltd. | 0.00% | New | 174,153 | $737K |
| Mariner, LLC | 0.00% | Add +9.1% | 173,570 | $734K |
| Gsa Capital Partners LLP | 0.04% | Reduce -52.7% | 163,290 | $691K |
| Millennium Management | 0.00% | Reduce -88.5% | 159,524 | $675K |
| Alliancebernstein L.P. | 0.00% | Add +228.1% | 163,940 | $618K |
| Deutsche Bank AG | 0.00% | Add +50.1% | 137,646 | $582K |
| LPL Financial LLC | 0.00% | Add +42.5% | 137,208 | $580K |
| Vanguard Global Advisers, LLC | 0.00% | — | 128,110 | $542K |
| T. Rowe Price Associates Inc. | 0.00% | Add +93.8% | 122,120 | $517K |
| Profund Advisors LLC | 0.02% | New | 111,794 | $473K |
| Fulcrum Wealth Advisors, LLC | 0.38% | Add +124.5% | 109,251 | $462K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +70.8% | 98,289 | $412K |
| MetLife Investment Management, LLC | 0.00% | Add +246.8% | 94,255 | $399K |
| Tema ETFs LLC | 0.03% | New | 90,007 | $381K |
| Tidal Investments LLC | 0.00% | New | 90,007 | $381K |
| Engineers Gate Manager LP | 0.00% | New | 82,780 | $350K |
| Balyasny Asset Management L.P. | 0.00% | New | 81,695 | $346K |
| JPMorgan Chase & Co. | 0.00% | Add +65.4% | 81,824 | $328K |
| Squarepoint Ops LLC | 0.00% | Add +462.7% | 74,751 | $316K |
| Quantinno Capital Management LP | 0.00% | New | 74,378 | $315K |
| Citadel Advisors | 0.00% | New | 64,641 | $273K |
| Caitong International Asset Management Co., Ltd | 0.05% | Add +10.1% | 60,712 | $257K |
| Fifth Third Bancorp | 0.00% | New | 59,807 | $253K |
| AQR Capital Management | 0.00% | New | 53,990 | $228K |
| Intech Investment Management LLC | 0.00% | Add +27.3% | 51,255 | $217K |
| NORTHSTAR ASSET MANAGEMENT Co | 0.05% | No change | 50,000 | $212K |
| EntryPoint Capital, LLC | 0.06% | New | 48,224 | $204K |
| Osaic Holdings, Inc. | 0.00% | Add +99.5% | 47,272 | $200K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | Add +35.5% | 47,089 | $199K |
| BNP Paribas Financial Markets | 0.00% | Add +75.2% | 47,016 | $199K |
| Manufacturers Life Insurance Company, The | 0.00% | Add +20.2% | 45,691 | $193K |
| Instrumental Wealth, LLC | 0.12% | No change | 44,914 | $190K |
| Creative Planning | 0.00% | New | 40,571 | $172K |
| Farallon Capital Management, L.L.C. | 0.00% | New | 40,000 | $169K |
| New York State Common Retirement Fund | 0.00% | Add +465.2% | 39,000 | $165K |
| Commonwealth Equity Services, LLC | 0.00% | Add +31.6% | 38,470 | $163K |
| Accurate Wealth Management, LLC | 0.02% | New | 32,611 | $159K |
| Visionary Horizons, LLC | 0.07% | No change | 36,000 | $152K |
| Oxford Asset Management LLP | 0.06% | New | 35,501 | $150K |
| Axxcess Wealth Management, LLC | 0.00% | No change | 35,370 | $150K |
| Magnetar Financial LLC | 0.00% | New | 35,032 | $148K |
| Scientech Research LLC | 0.12% | Reduce -12.0% | 34,096 | $144K |
| Barclays PLC | 0.00% | Reduce -93.7% | 32,412 | $137K |
| E Fund Management Co., Ltd. | 0.00% | — | 31,354 | $133K |
| Genesee Capital Advisors, LLC | 0.05% | No change | 30,000 | $127K |
| Voya Investment Management LLC | 0.00% | Add +39.1% | 29,262 | $124K |
| Kestra Advisory Services, LLC | 0.00% | Add +6.4% | 29,150 | $123K |
| Millington Financial Advisors, LLC | 0.05% | No change | 25,000 | $122K |
| Prudential Financial Inc. | 0.00% | New | 28,690 | $121K |
| Scissortail Wealth Management, LLC | 0.02% | No change | 27,322 | $116K |
| Sei Investments Co. | 0.00% | No change | 26,581 | $112K |
| Citigroup Inc. | 0.00% | Reduce -53.8% | 25,646 | $108K |
| SJS Investment Consulting Inc. | 0.01% | New | 25,000 | $106K |
| ProShare Advisors LLC | 0.00% | Add +10.1% | 24,915 | $105K |
| World Investment Advisors | 0.00% | Reduce -44.2% | 24,616 | $104K |
| Jaffetilchin Investment Partners, LLC | 0.01% | No change | 24,338 | $103K |
| Financial Designs Corp | 0.05% | New | 23,327 | $99K |
| Independent Financial Group, LLC | 0.00% | No change | 23,250 | $98K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +226.1% | 21,110 | $89K |
| Stoneridge Investment Partners LLC | 0.06% | Reduce -66.9% | 20,287 | $86K |
| Simon Quick Advisors, LLC | 0.00% | No change | 20,000 | $85K |
| Private Advisor Group, LLC | 0.00% | Add +7.3% | 19,540 | $83K |
| Russell Investments Group, Ltd. | 0.00% | Add +88.3% | 18,006 | $76K |
| Grange Capital, LLC | 0.07% | Add +10.3% | 17,651 | $75K |
| Victory Capital Management Inc. | 0.00% | Reduce -1.9% | 16,048 | $68K |
| FMR LLC | 0.00% | Add +107.6% | 15,561 | $66K |
| Sig Brokerage, LP | 0.02% | New | 15,429 | $65K |
| Legal & General Group Plc | 0.00% | Add +16.2% | 15,142 | $64K |
| SG Americas Securities, LLC | 0.00% | Reduce -58.4% | 15,166 | $64K |
| Xponance LLC | 0.00% | New | 14,817 | $63K |
| ELCO Management Co., LLC | 0.03% | No change | 14,609 | $62K |
"% 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.