SELLAS LIFE SCIENCES GROUP I (SLS) 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 June 30, 2026. The institutional investors covered on this page collectively reported approximately $259.34M 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 $144.06M, representing an estimated gain of +179.20% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 72% 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
165
Total Reported Value
$259.34M
Largest Holder
Blackrock, Inc.
Largest Position
$51.60M
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
193
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 | $144,063,222 | +$92,463,949 | +179.20% | |
| State Street Corp | 0.00% | 8,396,356 | $35,516,586 | $99,160,964 | +$63,644,378 | +179.20% | |
| Vanguard Capital Management Llc | 0.00% | 7,525,929 | $31,834,680 | $88,881,221 | +$57,046,541 | +179.20% | |
| Dagco, Inc. | 3.36% | 1,232,433 | $18,190,706 | $14,555,034 | -$3,635,672 | -19.99% | |
| Geode Capital Management, Llc | 0.00% | 3,912,606 | $16,554,768 | $46,207,877 | +$29,653,109 | +179.12% | |
| Marshall Wace, Llp | 0.01% | 2,037,162 | $8,617,196 | $24,058,883 | +$15,441,687 | +179.20% | |
| Jones Financial Companies Lllp | 0.00% | 1,675,077 | $7,311,711 | $19,782,659 | +$12,470,948 | +170.56% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,462,806 | $6,187,669 | $17,275,739 | +$11,088,070 | +179.20% | |
| Morgan Stanley | 0.00% | 1,336,293 | $5,652,520 | $15,781,620 | +$10,129,100 | +179.20% | |
| Northern Trust Corp | 0.00% | 1,275,984 | $5,397,412 | $15,069,371 | +$9,671,959 | +179.20% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,202,839 | $5,088,009 | $14,205,529 | +$9,117,520 | +179.20% | |
| Citigroup Inc | 0.00% | 326,591 | $4,820,483 | $3,857,040 | -$963,443 | -19.99% | |
| Everhart Financial Group, Inc. | 0.27% | 288,018 | $4,251,146 | $3,401,493 | -$849,653 | -19.99% | |
| Ubs Group Ag | 0.00% | 745,419 | $3,153,123 | $8,803,398 | +$5,650,275 | +179.20% | |
| Invesco Ltd. | 0.00% | 698,080 | $2,952,878 | $8,244,325 | +$5,291,447 | +179.20% | |
| Nuveen, Llc | 0.00% | 670,974 | $2,838,220 | $7,924,203 | +$5,085,983 | +179.20% | |
| Alps Advisors Inc | 0.01% | 188,107 | $2,776,459 | $2,221,544 | -$554,915 | -19.99% | |
| Bank Of America Corp | 0.00% | 641,683 | $2,714,320 | $7,578,276 | +$4,863,956 | +179.20% | |
| Goldman Sachs Group Inc | 0.00% | 555,913 | $2,351,512 | $6,565,333 | +$4,213,821 | +179.20% | |
| Vontobel Holding Ltd. | 0.01% | 146,762 | $2,166,207 | $1,733,259 | -$432,948 | -19.99% | |
| Charles Schwab Investment Management Inc | 0.00% | 480,604 | $2,032,955 | $5,675,933 | +$3,642,978 | +179.20% | |
| Bank Of New York Mellon Corp | 0.00% | 478,366 | $2,023,488 | $5,649,502 | +$3,626,014 | +179.20% | |
| Two Sigma Investments, Lp | 0.00% | 403,165 | $1,705,388 | $4,761,379 | +$3,055,991 | +179.20% | |
| Susquehanna International Group, Llp | 0.00% | 397,056 | $1,679,547 | $4,689,231 | +$3,009,684 | +179.20% | |
| Daiwa Securities Group Inc. | 0.00% | 102,500 | $1,512,900 | $1,210,525 | -$302,375 | -19.99% | |
| Wellington Management Group Llp | 0.00% | 344,778 | $1,458,411 | $4,071,828 | +$2,613,417 | +179.20% | |
| Simplex Trading, Llc | 0.04% | 295,162 | $1,248,535 | $3,485,863 | +$2,237,328 | +179.20% | |
| Fulcrum Wealth Advisors, Llc | 0.83% | 73,253 | $1,081,214 | $865,118 | -$216,096 | -19.99% | |
| Rafferty Asset Management, Llc | 0.00% | 249,428 | $1,055,080 | $2,945,745 | +$1,890,665 | +179.20% | |
| New York State Common Retirement Fund | 0.00% | 66,300 | $978,588 | $783,003 | -$195,585 | -19.99% | |
| Wells Fargo & Company/Mn | 0.00% | 225,707 | $954,741 | $2,665,600 | +$1,710,859 | +179.20% | |
| Police & Firemen'S Retirement System Of New Jersey | 0.01% | 55,666 | $821,630 | $657,415 | -$164,215 | -19.99% | |
| Rhumbline Advisers | 0.00% | 194,198 | $821,452 | $2,293,478 | +$1,472,026 | +179.20% | |
| Mariner, Llc | 0.00% | 173,570 | $734,201 | $2,049,862 | +$1,315,661 | +179.20% | |
| Millennium Management Llc | 0.00% | 159,524 | $674,787 | $1,883,978 | +$1,209,191 | +179.20% | |
| Commonwealth Equity Services, Llc | 0.00% | 45,087 | $665,481 | $532,477 | -$133,004 | -19.99% | |
| Instrumental Wealth, Llc | 0.34% | 44,914 | $662,931 | $530,434 | -$132,497 | -19.99% | |
| Alliancebernstein L.P. | 0.00% | 163,940 | $618,054 | $1,936,131 | +$1,318,077 | +213.26% | |
| Accurate Wealth Management, Llc | 0.06% | 47,462 | $614,707 | $560,526 | -$54,181 | -8.81% | |
| Axxcess Wealth Management, Llc | 0.01% | 41,373 | $610,665 | $488,615 | -$122,050 | -19.99% | |
| Sjs Investment Consulting Inc. | 0.06% | 40,000 | $590,400 | $472,400 | -$118,000 | -19.99% | |
| Deutsche Bank Ag\ | 0.00% | 137,646 | $582,243 | $1,625,599 | +$1,043,356 | +179.20% | |
| Lpl Financial Llc | 0.00% | 137,208 | $580,390 | $1,620,426 | +$1,040,036 | +179.20% | |
| Vanguard Global Advisers, Llc | 0.00% | 128,110 | $541,905 | $1,512,979 | +$971,074 | +179.20% | |
| Visionary Horizons, Llc | 0.22% | 36,000 | $531,360 | $425,160 | -$106,200 | -19.99% | |
| Kestra Advisory Services, Llc | 0.00% | 34,980 | $516,305 | $413,114 | -$103,191 | -19.99% | |
| Northstar Asset Management Co | 0.10% | 45,000 | $509,400 | $531,450 | +$22,050 | +4.33% | |
| Profund Advisors Llc | 0.02% | 111,794 | $472,889 | $1,320,287 | +$847,398 | +179.20% | |
| Walleye Capital Llc | 0.00% | 30,116 | $444,512 | $355,670 | -$88,842 | -19.99% | |
| Walleye Trading Llc | 0.01% | 28,965 | $427,523 | $342,077 | -$85,446 | -19.99% |
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.