Who owns SLS?
Institutional ownership of SELLAS Life Sciences Group Inc. from Form 13F, Q2 2026
192 institutional managers reported holding SELLAS Life Sciences Group Inc. (SLS) in Form 13F filings for Q2 2026, with 73,753,515 shares worth $1.1B. The largest reported holder was BlackRock, Inc. Managers that filed both quarters added a net 19,730,408 shares (+36.6%). 59 opened new positions and 27 sold out.
- Funds holding
- 192
- Value held
- $1.1B
- New / sold out
- 59 / 27
- Net shares, same filers
- +36.6%
Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
Largest holders of SLS
| Fund | Value | Share of 13F holdings | Shares | Move |
|---|---|---|---|---|
| BlackRock, Inc. | $222M | 20.4% | 15,070,302 | Added |
| State Street Corp | $192M | 17.6% | 12,996,558 | Added |
| Vanguard Capital Management LLC | $121M | 11.2% | 8,226,105 | Added |
| Geode Capital Management, LLC | $72.1M | 6.6% | 4,884,175 | Added |
| Anson Funds Management LP | $66.4M | 6.1% | 4,500,000 | New |
| Vanguard Portfolio Management LLC | $31.9M | 2.9% | 2,161,099 | Added |
| Susquehanna International Group, LLP | $30.3M | 2.8% | 2,050,597 | Added |
| Jones Financial Companies LLLP | $28.6M | 3.1% | 2,304,561 | Added |
| Northern Trust Corp | $23.9M | 2.2% | 1,619,928 | Added |
| Vanguard Fiduciary Trust Co | $19.7M | 1.8% | 1,335,166 | Added |
| UBS Group AG | $18.5M | 1.7% | 1,252,757 | Added |
| Morgan Stanley | $18.2M | 1.7% | 1,236,261 | Trimmed |
| Dagco, Inc. | $18.2M | 1.7% | 1,232,433 | Added |
| BNP Paribas Financial Markets | $15.8M | 1.5% | 1,072,022 | Added |
| Bank of America Corp | $11.6M | 1.1% | 787,949 | Added |
| Wellington Management Group LLP | $8.8M | 0.8% | 597,309 | Added |
| Goldman Sachs Group Inc | $8.6M | 0.8% | 585,035 | Added |
| Charles Schwab Investment Management Inc | $8.3M | 0.8% | 565,008 | Added |
| Bank of New York Mellon Corp | $7.8M | 0.7% | 530,025 | Added |
| Jane Street Group, LLC | $7.5M | 0.7% | 508,429 | New |
| Nuveen, LLC | $6.2M | 0.6% | 418,729 | Trimmed |
| Opus Capital Group, LLC | $5.7M | 0.5% | 385,604 | Added |
| Invesco Ltd. | $5.5M | 0.5% | 375,342 | Trimmed |
| Swiss National Bank | $5.3M | 0.5% | 360,400 | New |
| XTX Topco Ltd | $5.3M | 0.5% | 359,090 | New |
Share of 13F holdings is each fund's shares as a share of the 73,753,515 SLS shares all 13F filers reported, not of shares outstanding.
Biggest buyers in Q2 2026
- State Street Corp Added+$67.9M
- Anson Funds Management LP New+$66.4M
- BlackRock, Inc. Added+$42.4M
- Susquehanna International Group, LLP Added+$24.4M
- BNP Paribas Financial Markets Added+$15.1M
- Geode Capital Management, LLC Added+$14.3M
- Vanguard Capital Management LLC Added+$10.3M
- Vanguard Portfolio Management LLC Added+$10.3M
- Jones Financial Companies LLLP Added+$7.8M
- Jane Street Group, LLC New+$7.5M
Biggest sellers in Q2 2026
- Marshall Wace, LLP Sold out-$8.6M
- Invesco Ltd. Trimmed-$4.8M
- Vision Financial Markets LLC Trimmed-$4.3M
- Nuveen, LLC Trimmed-$3.7M
- Simplex Trading, LLC Trimmed-$2.1M
- Two Sigma Investments, LP Sold out-$1.7M
- Morgan Stanley Trimmed-$1.5M
- Everhart Financial Group, Inc. Trimmed-$1.1M
- Engineers Gate Manager LP Trimmed-$1.0M
- Gsa Capital Partners LLP Trimmed-$987K
The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $362M and sold $37.9M; 77 added and 25 trimmed.
Schedule 13D and 13G filings on SLS
Owners of more than 5% must file within days, so these can be newer than the 13F data.
- 2026-11-10STATE STREET CORP SCHEDULE 13G filed by SELLAS Life Sciences Group Inc.Schedule 13G
- 2026-08-07STATE STREET CORP SCHEDULE 13G filed by SELLAS Life Sciences Group Inc.Schedule 13G
- 2025-10-17BlackRock, Inc. SCHEDULE 13G filed by BlackRock Inc.Schedule 13G
- 2025-07-29VANGUARD GROUP INC SCHEDULE 13G filed by SELLAS Life Sciences Group Inc.Schedule 13G
Questions about SLS ownership
- Who owns SLS stock?
- 192 institutional investment managers reported SLS positions in their Form 13F filings for Q2 2026, holding 73,753,515 shares worth $1.1B in total. BlackRock, Inc. reported the largest position.
- Are funds buying or selling SLS?
- In Q2 2026, 59 managers opened new SLS positions, 77 added, 25 trimmed and 27 sold out. Managers that filed in both quarters added a net 19,730,408 shares.
- How current is this SLS institutional ownership data?
- It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to SLS by CUSIP. Options are left out. SLS news and filings · SLS insider trades · Top funds