SELLAS Life Sciences SLS Institutional Ownership

NASDAQ SLS

$13.98 +0.28 (+2.04%)

As of: Sep 4, 2026 · 11:51 AM EDT

Institutions by Trading Activity

266 Institutions

Increased 180 67.7%

Unchanged 39 14.7%

Reduced 47 17.7%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

66.35%

▲+5.63 pp QoQ

Shares Held by Institutions

125.52Mn

of 189.18Mn outstanding

▲+28.84% QoQ

Shares Outstanding

189.18Mn

63.67Mn held outside 13F filers

Institutional Investors

266

filed 13F for Jun 2026

▲+37 vs prior quarter

Net Shares Added (QoQ)

+28.10Mn

accumulated since last quarter

Value of Holdings

$1.72Bn

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) showed up in the 13F filings of 266 institutional investors as of June 2026.

Their combined ownership stood at 66.3% of outstanding shares in June 2026, up from 60.7% in March 2026.
Their total shares held in SLS increased 28.84% quarter over quarter, and separately, investors owning SELLAS Life Sciences increased 114.52% from a year ago.
During the quarter, 180 of these 266 funds increased positions in SLS, 47 reduced exposure, and 39 held steady.
Institutional investors collectively held 125.52Mn shares in SELLAS Life Sciences as of June 2026, up by 28.1Mn shares quarter on quarter, and up 47.09Mn shares year over year.
Helikon Investments Ltd is the top holder of SELLAS Life Sciences as of June 30, 2026, with 18.96Mn shares representing 10.02% of outstanding stock.
The biggest buyers of SELLAS Life Sciences for the quarter ending June 2026 included State Street Corp (4.6Mn), Anson Funds Management LP (4.5Mn), Helikon Investments Ltd (3.41Mn), BlackRock, Inc. (2.87Mn), SUSQUEHANNA INTERNATIONAL GROUP, LLP (1.65Mn).
Leading sellers of SELLAS Life Sciences shares for the quarter ending June 2026 were UBS Group AG (766.52K), ARROWSTREET CAPITAL, LIMITED PARTNERSHIP (684.89K), Man Group plc (324.2K), Invesco Ltd. (322.74K), VISION FINANCIAL MARKETS LLC (294.6K).
Per Business Quant, the top 10 investors in SLS for the quarter ending June 2026 include Helikon Investments Ltd (18.96Mn), 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), MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. (4.49Mn), PSquared Asset Management AG (4.08Mn), Principal Financial Group Inc (2.94Mn), Orion Resource Partners LP (2.7Mn).

Form 13F Holdings

266 Institutional Holders

Report period 30 Jun, 2026

Total shares held 125.52Mn

Of outstanding 66.35%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Helikon Investments Ltd	0001839497	18,955,119	10.02%	▲3,409,274	+21.93%	$158.84Mn
2	BlackRock, Inc.	0002012383	15,070,302	7.97%	▲2,871,892	+23.54%	$222.44Mn
3	State Street Corp	0000093751	12,996,558	6.87%	▲4,600,202	+54.79%	$191.83Mn
4	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	8,226,105	4.35%	▲700,176	+9.30%	$121.42Mn
5	GEODE CAPITAL MANAGEMENT, LLC	0001214717	4,884,175	2.58%	▲971,569	+24.83%	$72.11Mn
6	Anson Funds Management LP	0001491072	4,500,000	2.38%	▲4,500,000	0.00%	$66.42Mn
7	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	0001705339	4,491,895	2.37%	▲457,481	+11.34%	$37.77Mn
8	PSquared Asset Management AG	0001623624	4,080,050	2.16%	▼4,265	-0.10%	$34.32Mn
9	Principal Financial Group Inc	0001126328	2,937,200	1.55%	▼62,800	-2.09%	$24.70Mn
10	Orion Resource Partners LP	0002032200	2,700,000	1.43%	0	0.00%	$22.63Mn
11	JONES FINANCIAL COMPANIES LLLP	0000815917	2,304,561	1.22%	▲629,484	+37.58%	$28.55Mn
12	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	2,161,099	1.14%	▲698,293	+47.74%	$31.90Mn
13	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0001446194	2,050,597	1.08%	▲1,653,541	+416.45%	$30.27Mn
14	PICTON MAHONEY ASSET MANAGEMENT	0001539041	1,888,614	1.00%	▼268,908	-12.46%	$15.85Mn
15	Sprott Inc.	0001512920	1,763,559	0.93%	▲2,185	+0.12%	$14.78Mn
16	Northern Trust Corp	0000073124	1,619,928	0.86%	▲343,944	+26.96%	$23.91Mn
17	Bank Of America Corp /De/	0000070858	1,511,923	0.80%	▲235,848	+18.48%	$12.67Mn
18	Jpmorgan Chase & Co	0000019617	1,501,328	0.79%	▲65,597	+4.57%	$12.61Mn
19	VANGUARD FIDUCIARY TRUST CO	0000933478	1,335,166	0.71%	▲132,327	+11.00%	$19.71Mn
20	UBS Group AG	0001610520	1,252,757	0.66%	▲507,338	+68.06%	$18.49Mn

Showing 1 to 20 of 266 holders