SELLAS Life Sciences SLS Institutional Ownership

NASDAQ SLS

$12.31 +0.80 (+6.95%)

At close: Sep 30, 2026 · 4:00 PM EDT

Institutions by Trading Activity

191 Institutions

Increased 141 73.8%

Unchanged 26 13.6%

Reduced 24 12.6%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

39.26%

▲+8.01 pp QoQ

Shares Held by Institutions

74.27Mn

of 189.18Mn outstanding

▲+47.15% QoQ

Shares Outstanding

189.18Mn

114.91Mn held outside 13F filers

Institutional Investors

191

filed 13F for Jun 2026

▲+35 vs prior quarter

Net Shares Added (QoQ)

+23.80Mn

accumulated since last quarter

Value of Holdings

$914.28Mn

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

Quarter ending 30 Jun, 2026

SELLAS Life Sciences Group, Inc. (NASDAQ:SLS) has 191 institutional investors with active 13F positions as of June 2026.

Collectively, these holders controlled 39.3% of SELLAS Life Sciences's outstanding shares in June 2026, up from 31.2% in March 2026.
They increased total shares held in SELLAS Life Sciences by 47.15% from last quarter, and the number of investors in SLS increased 144.87% annually.
Activity in SLS broke down as 141 buyers, 24 sellers, and 26 unchanged among 191 total holders.
Institutional investors collectively held 74.27Mn shares in SELLAS Life Sciences as of June 2026, up by 23.8Mn shares quarter on quarter, and up 48.65Mn shares year over year.
As of June 30, 2026, BlackRock, Inc. held the largest stake in SELLAS Life Sciences with 15.07Mn shares, accounting for 7.97% of total shares outstanding.
Leading buyers of SELLAS Life Sciences shares for the quarter ending June 2026 were State Street Corp (4.6Mn), Anson Funds Management LP (4.5Mn), BlackRock, Inc. (2.87Mn), SUSQUEHANNA INTERNATIONAL GROUP, LLP (1.65Mn), BNP PARIBAS FINANCIAL MARKETS (1.03Mn).
The largest sales of SLS for the quarter ending June 2026 came from Invesco Ltd. (322.74K), VISION FINANCIAL MARKETS LLC (294.6K), Nuveen, LLC (252.24K), SIMPLEX TRADING, LLC (141.06K), Morgan Stanley (100.03K).
Business Quant data shows the 10 biggest positions in SELLAS Life Sciences as of June 2026 are held by BlackRock, Inc. (15.07Mn), State Street Corp (13.0Mn), VANGUARD CAPITAL MANAGEMENT LLC (8.23Mn), GEODE CAPITAL MANAGEMENT, LLC (4.88Mn), Anson Funds Management LP (4.5Mn), JONES FINANCIAL COMPANIES LLLP (2.3Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (2.16Mn), SUSQUEHANNA INTERNATIONAL GROUP, LLP (2.05Mn), Northern Trust Corp (1.62Mn), VANGUARD FIDUCIARY TRUST CO (1.34Mn).

Form 13F Holdings

191 Institutional Holders

Report period 30 Jun, 2026

Total shares held 74.27Mn

Of outstanding 39.26%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	15,070,302	7.97%	▲2,871,892	+23.54%	$222.44Mn
2	State Street Corp	0000093751	12,996,558	6.87%	▲4,600,202	+54.79%	$191.83Mn
3	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	8,226,105	4.35%	▲700,176	+9.30%	$121.42Mn
4	GEODE CAPITAL MANAGEMENT, LLC	0001214717	4,884,175	2.58%	▲971,569	+24.83%	$72.11Mn
5	Anson Funds Management LP	0001491072	4,500,000	2.38%	▲4,500,000	0.00%	$66.42Mn
6	JONES FINANCIAL COMPANIES LLLP	0000815917	2,304,561	1.22%	▲629,484	+37.58%	$28.55Mn
7	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	2,161,099	1.14%	▲698,293	+47.74%	$31.90Mn
8	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0001446194	2,050,597	1.08%	▲1,653,541	+416.45%	$30.27Mn
9	Northern Trust Corp	0000073124	1,619,928	0.86%	▲343,944	+26.96%	$23.91Mn
10	VANGUARD FIDUCIARY TRUST CO	0000933478	1,335,166	0.71%	▲132,327	+11.00%	$19.71Mn
11	UBS Group AG	0001610520	1,252,757	0.66%	▲507,338	+68.06%	$18.49Mn
12	Morgan Stanley	0000895421	1,236,261	0.65%	▼100,032	-7.49%	$18.25Mn
13	DAGCO, INC.	0001767343	1,232,433	0.65%	▲203,653	+19.80%	$18.19Mn
14	BNP PARIBAS FINANCIAL MARKETS	0001166588	1,072,022	0.57%	▲1,025,006	+2,180.12%	$15.82Mn
15	Bank Of America Corp /De/	0000070858	787,949	0.42%	▲146,266	+22.79%	$11.63Mn
16	WELLINGTON MANAGEMENT GROUP LLP	0000902219	597,309	0.32%	▲252,531	+73.24%	$8.82Mn
17	Goldman Sachs Group Inc	0000886982	585,035	0.31%	▲29,122	+5.24%	$8.64Mn
18	Sixth Street Partners Management Company, L.P.	0001812095	565,008	0.30%	▲565,008	0.00%	$8.34Mn
18	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	565,008	0.30%	▲84,404	+17.56%	$8.34Mn
19	Bank of New York Mellon Corp	0001390777	530,025	0.28%	▲51,659	+10.80%	$7.82Mn

Showing 1 to 20 of 191 holders