SELLAS Life Sciences Group, Inc.

SLS

Exchange: Nasdaq
Industry: Pharmaceutical Preparations
SEC CIK: 0001390478

SEC filings (opens in a new tab)

No open-market purchases or sales by SELLAS Life Sciences Group, Inc. insiders were filed in the last 90 days; 193 institutions reported holding it in 13F filings for Q2 2026, worth $1.08B in total; no superinvestor holds it.

Q1 2026 vs. Q4 2025

How the institutions holding SELLAS Life Sciences Group, Inc. changed between Q4 2025 and Q1 2026.

All holders in Q1 2026 All holders in Q4 2025

13F holders of SLS: Q4 2025 compared with Q1 2026
Measure	Q4 2025	Of which not filed for Q1 2026	Q1 2026	Change
Holders	112	3	160	+51
Shares	35.5M	8.47M	54.0M	+27.0M (+100.0%)
Value	$133.7M	$31.9M	$228.4M	+$126.6M (+124.4%)

3 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (67)

Institutions that held SELLAS Life Sciences Group, Inc. at the end of Q1 2026 but not at the end of Q4 2025.

Institutions new to SLS in Q1 2026
Institution	Shares	Value	% of portfolio
Vanguard Capital Management LLC	7,525,929	$31.8M	0.00%
Vanguard Portfolio Management LLC	1,462,806	$6.19M	0.00%
Vanguard Fiduciary Trust Co	1,202,839	$5.09M	0.00%
Wellington Management Group LLP	344,778	$1.46M	0.00%
Vision Financial Markets LLC	304,400	$1.29M	1.26%
Simplex Trading, LLC	295,162	$1.25M	0.04%
Rafferty Asset Management, LLC	249,428	$1.06M	0.00%
Virtu Financial LLC	221,829	$938.0K	0.04%
Vontobel Holding Ltd.	174,153	$736.7K	0.00%
Vanguard Global Advisers, LLC	128,110	$541.9K	0.00%
Profund Advisors LLC	111,794	$472.9K	0.02%
Toroso Investments, LLC	90,007	$380.7K	0.00%
Tema ETFs LLC	90,007	$380.7K	0.03%
Engineers Gate Manager LP	82,780	$350.2K	0.00%
Balyasny Asset Management LLC	81,695	$345.6K	0.00%
Quantinno Capital Management LP	74,378	$314.6K	0.00%
Citadel Advisors LLC	64,641	$273.4K	0.00%
Fifth Third Bancorp	59,807	$253.0K	0.00%
AQR Capital Management LLC	53,990	$228.4K	0.00%
EntryPoint Capital, LLC	48,224	$204.0K	0.06%
Creative Planning	40,571	$171.6K	0.00%
Farallon Capital Management, L.L.C.	40,000	$169.2K	0.00%
Accurate Wealth Management, LLC	32,611	$158.7K	0.02%
Oxford Asset Management LLP	35,501	$150.2K	0.06%
Magnetar Financial LLC	35,032	$148.2K	0.00%
E Fund Management Co., Ltd.	31,354	$132.6K	0.00%
Prudential Financial Inc	28,690	$121.4K	0.00%
SJS Investment Consulting Inc.	25,000	$105.8K	0.01%
Financial Designs Corp	23,327	$98.7K	0.05%
Sig Brokerage, LP	15,429	$65.3K	0.02%
Xponance, Inc.	14,817	$62.7K	0.00%
Principal Financial Group Inc	12,429	$52.6K	0.00%
Verition Fund Management LLC	12,262	$51.9K	0.00%
Wealthfront Advisers LLC	11,436	$48.4K	0.00%
Wiley Bros.-Aintree Capital, LLC	10,941	$46.3K	0.00%
Envestnet Asset Management Inc	10,941	$46.3K	0.00%
Marex Group plc	10,833	$45.8K	0.00%
GTS Securities LLC	10,329	$43.7K	0.00%
Integrated Wealth Concepts LLC	10,011	$42.3K	0.00%
First Financial Bank - Trust Division	10,000	$42.3K	0.00%
Clearstead Advisors, LLC	6,548	$27.7K	0.00%
Quent Capital, LLC	5,088	$21.5K	0.00%
Nisa Investment Advisors, LLC	2,600	$11.0K	0.00%
Colonial Trust Advisors	2,516	$10.6K	0.00%
Bellevue Asset Management, LLC	2,512	$10.6K	0.01%
National Bank of Canada	2,387	$10.0K	0.00%
Daiwa Securities Group Inc.	2,200	$9.31K	0.00%
Glen Eagle Advisors, LLC	2,176	$9.20K	0.00%
Quantbot Technologies LP	2,049	$8.67K	0.00%
Atlantic Private Wealth, LLC	2,000	$8.46K	0.01%
Marathon Trading Investment Management LLC	1,191	$5.04K	0.00%
Quadrant Capital Group LLC	1,059	$4.48K	0.00%
IFP Advisors, Inc	925	$3.91K	0.00%
Financial Consulate, Inc	600	$2.54K	0.00%
Sunbelt Securities, Inc.	395	$1.67K	0.00%
GWM Advisors LLC	300	$1.27K	0.00%
Fortitude Family Office, LLC	259	$1.10K	0.00%
Signaturefd, LLC	172	$728	0.00%
Strategic Wealth Partners, Ltd.	150	$635	0.00%
Root Financial Partners, LLC	60	$254	0.00%
Twin Peaks Wealth Advisors, LLC	40	$169	0.00%
Allworth Financial LP	26	$110	0.00%
EverSource Wealth Advisors, LLC	22	$93	0.00%
Keating Financial Advisory Services, Inc.	7	$30	0.00%
MAI Capital Management	2	$9	0.00%
Bogart Wealth, LLC	2	$8	0.00%
Hughes Financial Services, LLC	1	$4	0.00%

Sold out (16)

Institutions that held SELLAS Life Sciences Group, Inc. at the end of Q4 2025 and filed for Q1 2026 without it.

Institutions that sold out of SLS in Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
Clear Street Group Inc.	500,000	$1.89M
XTX Topco Ltd	118,440	$446.5K
Two Sigma Advisers, LP	76,554	$288.6K
Jane Street Group, LLC	59,536	$224.5K
Tyche Wealth Partners LLC	37,500	$141.4K
Regal Investment Advisors LLC	35,900	$135.3K
Equitable Holdings, Inc.	32,060	$120.9K
Trustmark National Bank Trust Department	24,000	$90.5K
Boothbay Fund Management, LLC	13,800	$52.0K
Money Concepts Capital Corp	10,600	$40.0K
Jefferies Financial Group Inc.	10,100	$38.1K
Beacon Pointe Advisors, LLC	10,000	$37.7K
SageView Advisory Group, LLC	5,000	$18.9K
Amalgamated Bank	3,892	$15.0K
Strengthening Families & Communities, LLC	500	$1.89K
NVWM, LLC	201	$758

Not filed for Q1 2026 yet (3)

Institutions that held SELLAS Life Sciences Group, Inc. at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding SLS in Q4 2025 that haven't filed for Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
Vanguard Group Inc	8,467,400	$31.9M
Global Retirement Partners, LLC	5,000	$18.9K
Motiv8 Investments LLC	80	$0