Who owns SELLAS Life Sciences Group (SLS)
Which tracked institutional funds hold SLS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SLS company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on SLS is one-sided between 2026-Q1 and 2026-Q2: 95 added or opened and 8 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
SLS’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in SLS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 184 tracked filers holding SLS, 134 increased or opened the position and 62 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in SLS between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 24
- Anson Funds Management LP$66M
- JANE STREET GROUP, LLC$8M
- Swiss National Bank$5M
- XTX Topco Ltd$5M
- RENAISSANCE TECHNOLOGIES LLC$5M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$4M
Full exits 7
- MARSHALL WACE, LLP$9M
- HRT FINANCIAL LP$3M
- TWO SIGMA INVESTMENTS, LP$2M
- Opus Capital Group, LLC$1M
- Virtu Financial LLC$938K
- GSA CAPITAL PARTNERS LLP$691K
Largest adds
- BlackRock, Inc.$171M
- STATE STREET CORP$156M
- VANGUARD CAPITAL MANAGEMENT LLC$90M
- GEODE CAPITAL MANAGEMENT, LLC$56M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$29M
- VANGUARD PORTFOLIO MANAGEMENT LLC$26M
Largest trims
- VISION FINANCIAL MARKETS LLC$1M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 15,070,302 | $222M | 21.0% | 2026-Q2 |
| STATE STREET CORP added | 12,996,558 | $192M | 18.1% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 8,226,105 | $121M | 11.4% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 4,884,175 | $72M | 6.8% | 2026-Q2 |
| Anson Funds Management LP trimmed | 4,500,000 | $66M | 6.3% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP added | 2,304,561 | $29M | 2.7% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 2,161,099 | $32M | 3.0% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 2,050,597 | $30M | 2.9% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,619,928 | $24M | 2.3% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 1,335,166 | $20M | 1.9% | 2026-Q2 |
| UBS Group AG added | 1,252,757 | $18M | 1.7% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,236,261 | $18M | 1.7% | 2026-Q2 |
| DAGCO, INC. added | 1,232,433 | $18M | 1.7% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 1,072,022 | $16M | 1.5% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 787,949 | $12M | 1.1% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 597,309 | $9M | 0.8% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 585,035 | $9M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 565,008 | $8M | 0.8% | 2026-Q2 |
| Bank of New York Mellon Corp added | 530,025 | $8M | 0.7% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 508,429 | $8M | 0.7% | 2026-Q2 |
| Nuveen, LLC trimmed | 418,729 | $6M | 0.6% | 2026-Q2 |
| Invesco Ltd. trimmed | 375,342 | $6M | 0.5% | 2026-Q2 |
| Swiss National Bank new | 360,400 | $5M | 0.5% | 2026-Q2 |
| XTX Topco Ltd added | 359,090 | $5M | 0.5% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 328,819 | $5M | 0.5% | 2026-Q2 |
| CITIGROUP INC added | 326,591 | $5M | 0.5% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 310,364 | $5M | 0.4% | 2026-Q2 |
| Everhart Financial Group, Inc. trimmed | 288,018 | $4M | 0.4% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC new | 273,403 | $4M | 0.4% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 239,892 | $4M | 0.3% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 236,060 | $999K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 230,402 | $3M | 0.3% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 202,374 | $3M | 0.3% | 2026-Q2 |
| Jefferies Financial Group Inc. added | 200,459 | $3M | 0.3% | 2026-Q2 |
| Mariner, LLC added | 198,212 | $3M | 0.3% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 190,128 | $3M | 0.3% | 2026-Q2 |
| ALPS ADVISORS INC new | 188,107 | $3M | 0.3% | 2026-Q2 |
| Legal & General Group Plc added | 167,800 | $2M | 0.2% | 2026-Q2 |
| LPL Financial LLC added | 155,663 | $2M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 155,066 | $2M | 0.2% | 2026-Q2 |
| SIMPLEX TRADING, LLC trimmed | 154,099 | $2M | 0.2% | 2026-Q2 |
| Vontobel Holding Ltd. trimmed | 146,762 | $2M | 0.2% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 130,005 | $2M | 0.2% | 2026-Q2 |
| Tidal Investments LLC added | 128,761 | $2M | 0.2% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 125,989 | $2M | 0.2% | 2026-Q2 |
| PROFUND ADVISORS LLC added | 120,607 | $2M | 0.2% | 2026-Q2 |
| FRANKLIN RESOURCES INC new | 119,156 | $2M | 0.2% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 114,775 | $2M | 0.2% | 2026-Q2 |
| MetLife Investment Management, LLC added | 110,082 | $2M | 0.2% | 2026-Q2 |
| Daiwa Securities Group Inc. added | 102,500 | $2M | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 100,135 | $2M | 0.1% | 2026-Q2 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC new | 99,400 | $1M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD new | 95,210 | $1M | 0.1% | 2026-Q2 |
| Harvest Investment Services, LLC new | 94,482 | $1M | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) new | 83,305 | $1M | 0.1% | 2026-Q2 |
| Jupiter Topco LLC new | 79,600 | $1M | 0.1% | 2026-Q2 |
| Gotham Asset Management, LLC new | 74,344 | $1M | 0.1% | 2026-Q2 |
| FULCRUM WEALTH ADVISORS, LLC trimmed | 73,253 | $1M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 71,225 | $1M | 0.1% | 2026-Q2 |
| Creative Planning added | 70,643 | $1M | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 66,300 | $979K | 0.1% | 2026-Q2 |
| NATIONAL BANK OF CANADA /FI/ added | 60,443 | $892K | 0.1% | 2026-Q2 |
| OSAIC HOLDINGS, INC. added | 60,284 | $890K | 0.1% | 2026-Q2 |
| FIFTH THIRD BANCORP added | 60,190 | $888K | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 58,120 | $858K | 0.1% | 2026-Q2 |
| State of New Jersey Common Pension Fund D new | 58,067 | $857K | 0.1% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey added | 55,666 | $822K | 0.1% | 2026-Q2 |
| ARIZONA STATE RETIREMENT SYSTEM new | 49,552 | $731K | 0.1% | 2026-Q2 |
| Caption Management, LLC new | 49,373 | $729K | 0.1% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 48,937 | $722K | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV new | 48,383 | $714K | 0.1% | 2026-Q2 |
| Accurate Wealth Management, LLC added | 47,462 | $615K | 0.1% | 2026-Q2 |
| Vanguard Investments Australia, Ltd. new | 46,385 | $685K | 0.1% | 2026-Q2 |
| COMMONWEALTH EQUITY SERVICES, LLC added | 45,087 | $665K | 0.1% | 2026-Q2 |
| NORTHSTAR ASSET MANAGEMENT Co trimmed | 45,000 | $509K | 0.0% | 2026-Q2 |
| INSTRUMENTAL WEALTH, LLC | 44,914 | $663K | 0.1% | 2026-Q2 |
| Virtus Investment Advisers, LLC new | 41,788 | $617K | 0.1% | 2026-Q2 |
| AXXCESS WEALTH MANAGEMENT, LLC added | 41,373 | $611K | 0.1% | 2026-Q2 |
| KLP KAPITALFORVALTNING AS new | 40,700 | $601K | 0.1% | 2026-Q2 |
| SJS Investment Consulting Inc. added | 40,000 | $590K | 0.1% | 2026-Q2 |
| Wealthfront Advisers LLC added | 39,822 | $588K | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 37,298 | $551K | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 37,036 | $547K | 0.1% | 2026-Q2 |
| Visionary Horizons, LLC | 36,000 | $531K | 0.1% | 2026-Q2 |
| BARCLAYS PLC added | 35,783 | $528K | 0.0% | 2026-Q2 |
| Kestra Advisory Services, LLC added | 34,980 | $516K | 0.0% | 2026-Q2 |
| MANGROVE PARTNERS IM, LLC new | 34,140 | $504K | 0.0% | 2026-Q2 |
| E Fund Management Co., Ltd. added | 33,825 | $499K | 0.0% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC trimmed | 32,182 | $475K | 0.0% | 2026-Q2 |
| Scissortail Wealth Management, LLC added | 31,322 | $462K | 0.0% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 31,110 | $459K | 0.0% | 2026-Q2 |
| Sculptor Capital LP new | 30,300 | $447K | 0.0% | 2026-Q2 |
| Walleye Capital LLC new | 30,116 | $445K | 0.0% | 2026-Q2 |
| Genesee Capital Advisors, LLC | 30,000 | $443K | 0.0% | 2026-Q2 |
| Walleye Trading LLC new | 28,965 | $428K | 0.0% | 2026-Q2 |
| SEI INVESTMENTS CO | 26,581 | $392K | 0.0% | 2026-Q2 |
| STRS OHIO new | 26,100 | $385K | 0.0% | 2026-Q2 |
| FMR LLC added | 25,533 | $377K | 0.0% | 2026-Q2 |
| ProShare Advisors LLC trimmed | 24,711 | $365K | 0.0% | 2026-Q2 |
| Pictet Asset Management Holding SA new | 23,984 | $354K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.