SELLAS Life Sciences SLS Institutional Ownership

NASDAQ SLS

$11.35 -0.79 (-6.51%)

At close: Oct 22, 2026 · 4:00 PM EDT

Institutions by Trading Activity

191 Institutions

Increased 140 73.3%

Unchanged 27 14.1%

Reduced 24 12.6%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

36.51%

▲+6.79 pp QoQ

Shares Held by Institutions

73.73Mn

of 201.92Mn outstanding

▲+36.80% QoQ

Shares Outstanding

201.92Mn

128.19Mn held outside 13F filers

Institutional Investors

191

filed 13F for Jun 2026

▲+35 vs prior quarter

Net Shares Added (QoQ)

+19.83Mn

accumulated since last quarter

Value of Holdings

$895.09Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 21, 2026

SELLAS Life Sciences Group, Inc. (NASDAQ:SLS) was reported as a holding by 191 institutional investors in 13F filings for the quarter ended June 30, 2026.

Together they owned 36.51% of the outstanding stock in Q2 2026, up from 29.72% a quarter earlier.
Total holdings of SELLAS Life Sciences shares rose 36.80% from Q1 2026, and the number of holders rose 148.05% from Q2 2025.
Of these 191 holders, 140 added to their positions, 24 reduced their stakes and 27 left their positions unchanged.
Combined, institutional investors held 73.73Mn shares of SLS as of Q2 2026, up 19.83Mn from the prior quarter and up 48.11Mn from a year earlier.
As of June 30, 2026, BlackRock, Inc. held the largest stake in SELLAS Life Sciences with 15.07Mn shares, or 7.46% of shares outstanding.
Holders that added the most shares of SELLAS Life Sciences in Q2 2026 were State Street Corp (+4.6Mn shares), BlackRock, Inc. (+2.87Mn shares), Susquehanna International Group, LLP (+1.65Mn shares), BNP Paribas Financial Markets (+1.03Mn shares) and Geode Capital Management, LLC (+971.57K shares).
On the other side, among holders that kept a position in SELLAS Life Sciences, the largest reductions in Q2 2026 came from Invesco Ltd. (-322.74K shares), Vision Financial Markets LLC (-294.6K shares), Nuveen, LLC (-252.25K shares), Simplex Trading, LLC (-141.06K shares) and Morgan Stanley (-100.03K shares).
Per Business Quant, the top 10 investors in SLS for the quarter ended June 30, 2026 were BlackRock, Inc. (15.07Mn shares), State Street Corp (13Mn shares), Vanguard Capital Management LLC (8.23Mn shares), Geode Capital Management, LLC (4.88Mn shares), Anson Funds Management LP (4.5Mn shares), Jones Financial Companies LLLP (2.3Mn shares), Vanguard Portfolio Management LLC (2.16Mn shares), Susquehanna International Group, LLP (2.05Mn shares), Northern Trust Corp (1.62Mn shares) and Vanguard Fiduciary Trust Co (1.34Mn shares).

Form 13F Holdings

191 Institutional Holders

Report period 30 Jun, 2026

Total shares held 73.73Mn

Of outstanding 36.51%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	15,070,302	7.46%	▲2,871,892	+23.54%	$222.44Mn
2	State Street Corp	0000093751	12,996,558	6.44%	▲4,600,202	+54.79%	$191.83Mn
3	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	8,226,105	4.07%	▲700,176	+9.30%	$121.42Mn
4	GEODE CAPITAL MANAGEMENT, LLC	0001214717	4,884,175	2.42%	▲971,569	+24.83%	$72.11Mn
5	Anson Funds Management LP	0001491072	4,500,000	2.23%	▲4,500,000	0.00%	$66.42Mn
6	JONES FINANCIAL COMPANIES LLLP	0000815917	2,304,561	1.14%	▲629,484	+37.58%	$28.55Mn
7	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	2,161,099	1.07%	▲698,293	+47.74%	$31.90Mn
8	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0001446194	2,050,597	1.02%	▲1,653,541	+416.45%	$30.27Mn
9	Northern Trust Corp	0000073124	1,619,928	0.80%	▲343,944	+26.96%	$23.91Mn
10	VANGUARD FIDUCIARY TRUST CO	0000933478	1,335,166	0.66%	▲132,327	+11.00%	$19.71Mn
11	UBS Group AG	0001610520	1,252,757	0.62%	▲507,338	+68.06%	$18.49Mn
12	Morgan Stanley	0000895421	1,236,261	0.61%	▼100,032	-7.49%	$18.25Mn
13	DAGCO, INC.	0001767343	1,232,433	0.61%	▲203,653	+19.80%	$18.19Mn
14	BNP PARIBAS FINANCIAL MARKETS	0001166588	1,072,022	0.53%	▲1,025,006	+2,180.12%	$15.82Mn
15	Bank Of America Corp /De/	0000070858	787,949	0.39%	▲146,266	+22.79%	$11.63Mn
16	WELLINGTON MANAGEMENT GROUP LLP	0000902219	597,309	0.30%	▲252,531	+73.24%	$8.82Mn
17	Goldman Sachs Group Inc	0000886982	585,035	0.29%	▲29,122	+5.24%	$8.64Mn
18	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	565,008	0.28%	▲84,404	+17.56%	$8.34Mn
19	Bank of New York Mellon Corp	0001390777	530,025	0.26%	▲51,659	+10.80%	$7.82Mn
20	JANE STREET GROUP, LLC	0001595888	508,429	0.25%	▲508,429	0.00%	$7.50Mn

Showing 1 to 20 of 191 holders