SELLAS LIFE SCIENCES GROUP I (SLS) Top Institutional Shareholders
SELLAS LIFE SCIENCES GROUP I (SLS) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $223.96M in SLS holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of SLS tracked by InsiderSet, reporting ownership valued at approximately $51.60M in its March 31, 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 $94.66M, representing an estimated gain of +83.45% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 78% 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
155
Total Reported Value
$223.96M
Largest Holder
Blackrock, Inc.
Largest Position
$51.60M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
173
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% | 12,198,410 | $51,599,273 | $94,659,662 | +$43,060,389 | +83.45% | |
| State Street Corp | 0.00% | 8,396,356 | $35,516,586 | $65,155,723 | +$29,639,137 | +83.45% | |
| Vanguard Capital Management Llc | 0.00% | 7,525,929 | $31,834,680 | $58,401,209 | +$26,566,529 | +83.45% | |
| Geode Capital Management, Llc | 0.00% | 3,912,606 | $16,554,768 | $30,361,823 | +$13,807,055 | +83.40% | |
| Marshall Wace, Llp | 0.01% | 2,037,162 | $8,617,196 | $15,808,377 | +$7,191,181 | +83.45% | |
| Jones Financial Companies Lllp | 0.00% | 1,675,077 | $7,311,711 | $12,998,598 | +$5,686,887 | +77.78% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,462,806 | $6,187,669 | $11,351,375 | +$5,163,706 | +83.45% | |
| Morgan Stanley | 0.00% | 1,336,293 | $5,652,520 | $10,369,634 | +$4,717,114 | +83.45% | |
| Northern Trust Corp | 0.00% | 1,275,984 | $5,397,412 | $9,901,636 | +$4,504,224 | +83.45% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,202,839 | $5,088,009 | $9,334,031 | +$4,246,022 | +83.45% | |
| Dagco, Inc. | 0.94% | 1,028,780 | $4,351,740 | $7,983,333 | +$3,631,593 | +83.45% | |
| Ubs Group Ag | 0.00% | 745,419 | $3,153,123 | $5,784,451 | +$2,631,328 | +83.45% | |
| Invesco Ltd. | 0.00% | 698,080 | $2,952,878 | $5,417,101 | +$2,464,223 | +83.45% | |
| Nuveen, Llc | 0.00% | 670,974 | $2,838,220 | $5,206,758 | +$2,368,538 | +83.45% | |
| Bank Of America Corp | 0.00% | 641,683 | $2,714,320 | $4,979,460 | +$2,265,140 | +83.45% | |
| Goldman Sachs Group Inc | 0.00% | 555,913 | $2,351,512 | $4,313,885 | +$1,962,373 | +83.45% | |
| Charles Schwab Investment Management Inc | 0.00% | 480,604 | $2,032,955 | $3,729,487 | +$1,696,532 | +83.45% | |
| Bank Of New York Mellon Corp | 0.00% | 478,366 | $2,023,488 | $3,712,120 | +$1,688,632 | +83.45% | |
| Two Sigma Investments, Lp | 0.00% | 403,165 | $1,705,388 | $3,128,560 | +$1,423,172 | +83.45% | |
| Susquehanna International Group, Llp | 0.00% | 397,056 | $1,679,547 | $3,081,155 | +$1,401,608 | +83.45% | |
| Everhart Financial Group, Inc. | 0.13% | 364,397 | $1,541,399 | $2,827,721 | +$1,286,322 | +83.45% | |
| Wellington Management Group Llp | 0.00% | 344,778 | $1,458,411 | $2,675,477 | +$1,217,066 | +83.45% | |
| Vision Financial Markets Llc | 1.26% | 304,400 | $1,287,612 | $2,362,144 | +$1,074,532 | +83.45% | |
| Simplex Trading, Llc | 0.04% | 295,162 | $1,248,535 | $2,290,457 | +$1,041,922 | +83.45% | |
| Rafferty Asset Management, Llc | 0.00% | 249,428 | $1,055,080 | $1,935,561 | +$880,481 | +83.45% | |
| Wells Fargo & Company/Mn | 0.00% | 225,707 | $954,741 | $1,751,486 | +$796,745 | +83.45% | |
| Rhumbline Advisers | 0.00% | 194,198 | $821,452 | $1,506,976 | +$685,524 | +83.45% | |
| Vontobel Holding Ltd. | 0.00% | 174,153 | $736,667 | $1,351,427 | +$614,760 | +83.45% | |
| Mariner, Llc | 0.00% | 173,570 | $734,201 | $1,346,903 | +$612,702 | +83.45% | |
| Millennium Management Llc | 0.00% | 159,524 | $674,787 | $1,237,906 | +$563,119 | +83.45% | |
| Alliancebernstein L.P. | 0.00% | 163,940 | $618,054 | $1,272,174 | +$654,120 | +105.84% | |
| Deutsche Bank Ag\ | 0.00% | 137,646 | $582,243 | $1,068,133 | +$485,890 | +83.45% | |
| Lpl Financial Llc | 0.00% | 137,208 | $580,390 | $1,064,734 | +$484,344 | +83.45% | |
| Vanguard Global Advisers, Llc | 0.00% | 128,110 | $541,905 | $994,134 | +$452,229 | +83.45% | |
| Profund Advisors Llc | 0.02% | 111,794 | $472,889 | $867,521 | +$394,632 | +83.45% | |
| Fulcrum Wealth Advisors, Llc | 0.38% | 109,251 | $462,132 | $847,788 | +$385,656 | +83.45% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.00% | 98,289 | $411,785 | $762,723 | +$350,938 | +85.22% | |
| Metlife Investment Management, Llc | 0.00% | 94,255 | $398,699 | $731,419 | +$332,720 | +83.45% | |
| Tema Etfs Llc | 0.03% | 90,007 | $380,730 | $698,454 | +$317,724 | +83.45% | |
| Tidal Investments Llc | 0.00% | 90,007 | $380,730 | $698,454 | +$317,724 | +83.45% | |
| Engineers Gate Manager Lp | 0.00% | 82,780 | $350,159 | $642,373 | +$292,214 | +83.45% | |
| Balyasny Asset Management L.P. | 0.00% | 81,695 | $345,570 | $633,953 | +$288,383 | +83.45% | |
| Squarepoint Ops Llc | 0.00% | 74,751 | $316,197 | $580,068 | +$263,871 | +83.45% | |
| Quantinno Capital Management Lp | 0.00% | 74,378 | $314,619 | $577,173 | +$262,554 | +83.45% | |
| Citadel Advisors Llc | 0.00% | 64,641 | $273,431 | $501,614 | +$228,183 | +83.45% | |
| Caitong International Asset Management Co., Ltd | 0.05% | 60,712 | $256,812 | $471,125 | +$214,313 | +83.45% | |
| Fifth Third Bancorp | 0.00% | 59,807 | $252,984 | $464,102 | +$211,118 | +83.45% | |
| Aqr Capital Management Llc | 0.00% | 53,990 | $228,378 | $418,962 | +$190,584 | +83.45% | |
| Intech Investment Management Llc | 0.00% | 51,255 | $216,809 | $397,739 | +$180,930 | +83.45% | |
| Entrypoint Capital, Llc | 0.06% | 48,224 | $203,988 | $374,218 | +$170,230 | +83.45% |
Frequently asked questions about SLS
Who owns the most SLS stock?
The largest holders of SLS are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for SELLAS LIFE SCIENCES GROUP I (SLS).
Is SLS widely held by superinvestors?
Many widely followed stocks like SLS appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly SLS is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.