SLS Institutional Ownership & Shareholders
SELLAS LIFE SCIENCES GROUP I (SLS) is currently held by 194 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $1.05B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of SLS tracked by InsiderSet, reporting ownership valued at approximately $222.44M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $118.75M, representing an estimated loss of -46.61% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 76% of the total disclosed SLS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., State Street Corp, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in SELLAS LIFE SCIENCES GROUP I (SLS).
This page ranks the largest institutional SLS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
194
Total Reported Value
$1.05B
Largest Holder
Blackrock, Inc.
Largest Position
$222.44M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
104
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 15,070,302 | $222,437,657 | $118,753,980 | -$103,683,677 | -46.61% | |
| State Street Corp | 0.01% | 12,996,558 | $191,829,196 | $102,412,877 | -$89,416,319 | -46.61% | |
| Vanguard Capital Management Llc | 0.00% | 8,226,105 | $121,417,310 | $64,821,707 | -$56,595,603 | -46.61% | |
| Anson Funds Management Lp | 6.05% | 4,500,000 | $66,420,000 | $35,460,000 | -$30,960,000 | -46.61% | |
| Geode Capital Management, Llc | 0.00% | 5,171,819 | $63,677,118 | $40,753,934 | -$22,923,184 | -36.00% | |
| Vanguard Portfolio Management Llc | 0.00% | 2,161,099 | $31,897,821 | $17,029,460 | -$14,868,361 | -46.61% | |
| Susquehanna International Group, Llp | 0.03% | 2,050,597 | $30,266,812 | $16,158,704 | -$14,108,108 | -46.61% | |
| Jones Financial Companies Lllp | 0.01% | 2,304,561 | $28,553,511 | $18,159,941 | -$10,393,570 | -36.40% | |
| Northern Trust Corp | 0.00% | 1,619,928 | $23,910,138 | $12,765,033 | -$11,145,105 | -46.61% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,335,166 | $19,707,050 | $10,521,108 | -$9,185,942 | -46.61% | |
| Ubs Group Ag | 0.00% | 1,252,757 | $18,490,693 | $9,871,725 | -$8,618,968 | -46.61% | |
| Morgan Stanley | 0.00% | 1,236,261 | $18,247,211 | $9,741,737 | -$8,505,474 | -46.61% | |
| Dagco, Inc. | 2.85% | 1,336,449 | $16,451,691 | $10,531,218 | -$5,920,473 | -35.99% | |
| Bnp Paribas Financial Markets | 0.01% | 1,072,022 | $15,823,045 | $8,447,533 | -$7,375,512 | -46.61% | |
| Bank Of America Corp | 0.00% | 787,949 | $11,630,128 | $6,209,038 | -$5,421,090 | -46.61% | |
| Wellington Management Group Llp | 0.00% | 597,309 | $8,816,282 | $4,706,795 | -$4,109,487 | -46.61% | |
| Goldman Sachs Group Inc | 0.00% | 585,035 | $8,635,117 | $4,610,076 | -$4,025,041 | -46.61% | |
| Charles Schwab Investment Management Inc | 0.00% | 565,008 | $8,339,518 | $4,452,263 | -$3,887,255 | -46.61% | |
| Jane Street Group, Llc | 0.00% | 508,429 | $7,504,412 | $4,006,421 | -$3,497,991 | -46.61% | |
| Bank Of New York Mellon Corp | 0.00% | 521,128 | $6,415,090 | $4,106,489 | -$2,308,601 | -35.99% | |
| Nuveen, Llc | 0.00% | 418,729 | $6,180,440 | $3,299,585 | -$2,880,855 | -46.61% | |
| Invesco Ltd. | 0.00% | 375,342 | $5,540,049 | $2,957,695 | -$2,582,354 | -46.61% | |
| Swiss National Bank | 0.00% | 360,400 | $5,319,504 | $2,839,952 | -$2,479,552 | -46.61% | |
| Xtx Topco Ltd | 0.07% | 359,090 | $5,300,168 | $2,829,629 | -$2,470,539 | -46.61% | |
| Wells Fargo & Company/Mn | 0.00% | 328,819 | $4,853,368 | $2,591,094 | -$2,262,274 | -46.61% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 310,364 | $4,580,973 | $2,445,668 | -$2,135,305 | -46.61% |
| Creative Planning | 0.00% | 368,727 | $4,539,030 | $2,905,569 | -$1,633,461 | -35.99% | |
| Rafferty Asset Management, Llc | 0.01% | 239,892 | $3,540,806 | $1,890,349 | -$1,650,457 | -46.61% | |
| Lpl Financial Llc | 0.00% | 277,075 | $3,410,793 | $2,183,351 | -$1,227,442 | -35.99% | |
| Rhumbline Advisers | 0.00% | 230,402 | $3,400,726 | $1,815,568 | -$1,585,158 | -46.61% | |
| Alps Advisors Inc | 0.02% | 267,545 | $3,293,479 | $2,108,255 | -$1,185,224 | -35.99% | |
| California State Teachers Retirement System | 0.00% | 202,374 | $2,987,040 | $1,594,707 | -$1,392,333 | -46.61% | |
| Everhart Financial Group, Inc. | 0.18% | 240,213 | $2,957,022 | $1,892,878 | -$1,064,144 | -35.99% | |
| Mariner, Llc | 0.00% | 198,212 | $2,925,609 | $1,561,911 | -$1,363,698 | -46.61% | |
| Legal & General Group Plc | 0.00% | 167,800 | $2,476,729 | $1,322,264 | -$1,154,465 | -46.61% | |
| Deutsche Bank Ag\ | 0.00% | 197,537 | $2,431,680 | $1,556,592 | -$875,088 | -35.99% | |
| Price T Rowe Associates Inc | 0.00% | 155,066 | $2,289,000 | $1,221,920 | -$1,067,080 | -46.62% | |
| Vanguard Global Advisers, Llc | 0.00% | 130,005 | $1,918,874 | $1,024,439 | -$894,435 | -46.61% | |
| Tidal Investments Llc | 0.00% | 128,761 | $1,900,512 | $1,014,637 | -$885,875 | -46.61% | |
| Vanguard Asset Management, Ltd | 0.00% | 125,989 | $1,859,598 | $992,793 | -$866,805 | -46.61% | |
| Vontobel Holding Ltd. | 0.01% | 147,719 | $1,818,421 | $1,164,026 | -$654,395 | -35.99% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.00% | 114,775 | $1,713,307 | $904,427 | -$808,880 | -47.21% | |
| Metlife Investment Management, Llc | 0.01% | 110,082 | $1,624,810 | $867,446 | -$757,364 | -46.61% | |
| Jpmorgan Chase & Co | 0.00% | 100,135 | $1,547,086 | $789,064 | -$758,022 | -49.00% | |
| Kestra Advisory Services, Llc | 0.00% | 124,425 | $1,531,672 | $980,469 | -$551,203 | -35.99% | |
| Highbridge Capital Management Llc | 0.05% | 99,400 | $1,467,144 | $783,272 | -$683,872 | -46.61% | |
| Citigroup Inc | 0.00% | 119,036 | $1,465,334 | $938,004 | -$527,330 | -35.99% | |
| Gsa Capital Partners Llp | 0.09% | 96,429 | $1,423,000 | $759,861 | -$663,139 | -46.60% | |
| State Of Wisconsin Investment Board | 0.00% | 95,210 | $1,405,300 | $750,255 | -$655,045 | -46.61% | |
| Harvest Investment Services, Llc | 0.22% | 94,482 | $1,394,554 | $744,518 | -$650,036 | -46.61% |
Frequently asked questions about SLS
Who are the largest institutional holders of SLS?
The largest institutional holders of SLS reported in the latest SEC Form 13F filings include Blackrock, Inc., State Street Corp, Vanguard Capital Management Llc, Anson Funds Management Lp, and Geode Capital Management, Llc. InsiderSet ranks institutional holders by their latest reported SLS position.
What is SLS institutional ownership?
This page tracks SLS positions reported by institutional investment managers through SEC Form 13F. SELLAS LIFE SCIENCES GROUP I (SLS) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own SLS?
InsiderSet currently tracks 194 institutional managers reporting SLS holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of SLS shareholders.
How much SLS stock do institutions own?
Institutional investment managers disclosed approximately $1.05B in SLS holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was SLS institutional ownership last updated?
The latest SLS institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional SLS holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its SLS position after the reporting date.
Are institutions buying or selling SLS?
Institutional buying and selling can be analyzed by comparing SLS positions across consecutive 13F reporting periods. InsiderSet's SLS Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View SLS ownership changes.
How has SLS institutional ownership changed over time?
InsiderSet tracks SLS institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.