SELLAS Life Sciences Group, Inc. (SLS) Ownership
SLS ownership summary
as of October 18, 2026- Institutions
- 37.0% of shares outstanding
- Insiders
- 0.92% of shares outstanding
- Shares outstanding
- 201.9M
- Float
- 201.1M shares available to trade
- Short interest
- 27.41% 55.1M shares short
- Days to cover
- 8.57 short interest down 6.7% vs prior month
- Institutions 36.99%
- Insiders 0.92%
- Other investors 62.09%
SLS top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 7.46% | 15.1M | $150.4M | +2.9M (+23.5%) | June 30, 2026 |
| 2 | State Street Corp | 6.44% | 13.0M | $129.7M | +4.6M (+54.8%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 4.07% | 8.2M | $82.1M | +700,176 (+9.3%) | June 30, 2026 |
| 4 | Geode Capital Management, LLC | 2.42% | 4.9M | $48.7M | +971,569 (+24.8%) | June 30, 2026 |
| 5 | Anson Funds Management LP | 2.23% | 4.5M | $44.9M | +4.5M (0.0%) | June 30, 2026 |
| 6 | JONES FINANCIAL COMPANIES LLLP | 1.14% | 2.3M | $23.0M | +629,484 (+37.6%) | June 30, 2026 |
| 7 | Vanguard Portfolio Management, LLC | 1.07% | 2.2M | $21.6M | +698,293 (+47.7%) | June 30, 2026 |
| 8 | Susquehanna International Group, LLP | 1.02% | 2.1M | $20.5M | +1.7M (+416.5%) | June 30, 2026 |
| 9 | Northern Trust Corp | 0.80% | 1.6M | $16.2M | +343,944 (+27.0%) | June 30, 2026 |
| 10 | Vanguard Fiduciary Trust Co | 0.66% | 1.3M | $13.3M | +132,327 (+11.0%) | June 30, 2026 |
| 11 | UBS Group AG | 0.62% | 1.3M | $12.5M | +507,338 (+68.1%) | June 30, 2026 |
| 12 | Morgan Stanley - Brokerage Accounts | 0.61% | 1.2M | $12.3M | −100,032 (−7.5%) | June 30, 2026 |
| 13 | Dagco Inc | 0.61% | 1.2M | $12.3M | +203,653 (+19.8%) | June 30, 2026 |
| 14 | BNP Paribas Arbitrage, SA | 0.53% | 1.1M | $10.7M | +1.0M (+2,180.1%) | June 30, 2026 |
| 15 | Bank of America Corp | 0.39% | 788K | $7.9M | +146,266 (+22.8%) | June 30, 2026 |
| 16 | Wellington Management Company LLP | 0.30% | 597K | $6.0M | +252,531 (+73.2%) | June 30, 2026 |
| 17 | The Goldman Sachs Group Inc | 0.29% | 585K | $5.8M | +29,122 (+5.2%) | June 30, 2026 |
| 18 | Charles Schwab Investment Management Inc | 0.28% | 565K | $5.6M | +84,404 (+17.6%) | June 30, 2026 |
| 19 | Bank of New York Mellon Corp | 0.26% | 530K | $5.3M | +51,659 (+10.8%) | June 30, 2026 |
| 20 | Jane Street Group LLC | 0.25% | 508K | $5.1M | +508,429 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 19 holders added 19.9M shares and 1 cut 100K.
SLS top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.93% | 5.9M | $59.1M | −8,047 (−0.1%) | August 31, 2026 |
| 2 | State Street® SPDR® S&P® Biotech ETF | 2.82% | 5.7M | $56.9M | −109,000 (−1.9%) | September 30, 2026 |
| 3 | iShares Russell 2000 ETF | 2.58% | 5.2M | $52.0M | −60,096 (−1.1%) | September 30, 2026 |
| 4 | Fidelity Small Cap Index | 1.02% | 2.1M | $20.6M | +17,503 (+0.9%) | July 31, 2026 |
| 5 | iShares Russell 2000 Growth ETF | 0.93% | 1.9M | $18.8M | −2,380 (−0.1%) | September 30, 2026 |
| 6 | Vanguard Russell 2000 ETF | 0.58% | 1.2M | $11.7M | +84,226 (+7.8%) | September 30, 2026 |
| 7 | Schwab US Small-Cap ETF™ | 0.53% | 1.1M | $10.6M | +711 (+0.1%) | September 30, 2026 |
| 8 | Fidelity Extended Market Index | 0.45% | 911K | $9.1M | −12,501 (−1.4%) | August 31, 2026 |
| 9 | iShares Micro-Cap ETF | 0.31% | 634K | $6.3M | −4,375 (−0.7%) | September 30, 2026 |
| 10 | Vanguard Health Care ETF | 0.30% | 601K | $6.0M | +654 (+0.1%) | September 30, 2026 |
| 11 | Schwab Small Cap Index | 0.23% | 461K | $4.6M | +2,554 (+0.6%) | August 31, 2026 |
| 12 | Fidelity Total Market Index | 0.18% | 361K | $3.6M | — | August 31, 2026 |
| 13 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.17% | 350K | $3.5M | +10,399 (+3.1%) | September 30, 2026 |
| 14 | iShares Russell 2000 Small-Cap Idx Instl | 0.17% | 345K | $3.4M | −9,446 (−2.7%) | August 31, 2026 |
| 15 | Vanguard US Momentum Factor ETF | 0.16% | 317K | $3.2M | −128,805 (−28.9%) | June 30, 2026 |
| 16 | Fidelity Series Total Market Index | 0.14% | 291K | $2.9M | +2,616 (+0.9%) | August 31, 2026 |
| 17 | Invesco Dorsey Wright SmallCap Momt ETF | 0.14% | 285K | $2.8M | −758 (−0.3%) | September 30, 2026 |
| 18 | iShares Core S&P Total US Stock Mkt ETF | 0.14% | 274K | $2.7M | +240 (+0.1%) | September 30, 2026 |
| 19 | ALPS Medical Breakthroughs ETF | 0.13% | 268K | $2.7M | — | September 30, 2026 |
| 20 | Direxion Daily S&P Biotech Bull 3X ETF | 0.12% | 246K | $2.5M | +7,228 (+3.0%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
SLS insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-11-19 | Katherine Bach Kalin | Buy | $1.59 | 63,400 | $100,806 |
| 2025-06-12 | Nostrand Robert L Van | Buy | $1.48 | 10,000 | $14,800 |
| 2025-05-30 | Jane Wasman | Buy | $1.69 | 20,000 | $33,800 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
SLS shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns SLS
Institutional investors own 37.0% of SELLAS Life Sciences's shares and insiders 0.92%. The largest holder is BlackRock Inc with 7.46% of the shares (15.1M), as of June 30, 2026. Among the top 20 institutions, 19 added shares and 1 reduced their stake in the latest filings. Short interest is 27.41% of the float, or 8.57 days of average trading volume. The share count rose 414,814.6% since 2014.
Related: SLS analyst forecast, SLS key metrics. See the SLS stock overview for the latest quote and news.
SLS ownership FAQ
Who owns the most SELLAS Life Sciences stock?
The largest shareholders of SELLAS Life Sciences are BlackRock Inc (7.46%), State Street Corp (6.44%), Vanguard Capital Management, LLC (4.07%), Geode Capital Management, LLC (2.42%), Anson Funds Management LP (2.23%).
What percentage of SELLAS Life Sciences is owned by institutions?
Institutions hold 37.0% of SELLAS Life Sciences's shares outstanding; insiders hold 0.92%.
Which funds own SELLAS Life Sciences?
The largest fund holders of SELLAS Life Sciences are Vanguard MStar Total Stk Mkt Idx Invest (2.93%), State Street® SPDR® S&P® Biotech ETF (2.82%), iShares Russell 2000 ETF (2.58%), Fidelity Small Cap Index (1.02%), iShares Russell 2000 Growth ETF (0.93%).
What is SELLAS Life Sciences's short interest?
55.1M shares of SELLAS Life Sciences were sold short, 27.41% of the float; at the average daily volume it would take 8.57 days to cover.
Are insiders buying or selling SELLAS Life Sciences?
Of the latest 3 reported insider transactions in SELLAS Life Sciences (since May 30, 2025), 3 were purchases and 0 were sales.
How many shares of SELLAS Life Sciences are outstanding?
SELLAS Life Sciences has 201.9M shares outstanding, of which 201.1M are in the public float.