SELLAS Life Sciences Group, Inc. (SLS) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

113,183,333Shares Outstanding

237,782Shares held by institutions

$870,282Value of institutional holdings

31.71%Institutional ownership %

34.68%Shares Changed QoQ

105No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

A total of 105 institutions have reported a stake in SELLAS Life Sciences Group, Inc. (NASDAQ:SLS) as of December 2025, according to recent 13F filings with the SEC.

These investors collectively held 31.7% of the company's total shares outstanding in December 2025, up from 29.5% in September 2025.
On a quarter-over-quarter basis, institutional holdings shifted by 34.68%, with a year-over-year an increase of 228.12% in the count of filers.
Among the 105 institutional holders of SELLAS Life Sciences, 74 added to their stakes while 17 trimmed their positions and 14 held steady.
This class of investors increased its holdings in SELLAS Life Sciences to 35.89Mn shares for the 13F-cycle ending December 2025, up by 9.24Mn shares quarter on quarter, and up 29.07Mn shares year over year.
The top institutional stake in SELLAS Life Sciences as of December 31, 2025 belongs to VANGUARD GROUP INC, which owns 8.47Mn shares, or 7.48% of the company.
Among the most significant buyers of SELLAS Life Sciences during December 2025 were BlackRock, Inc. (1.85Mn), VANGUARD GROUP INC (1.63Mn), MILLENNIUM MANAGEMENT LLC (1.07Mn), TWO SIGMA INVESTMENTS, LP (936.35K), STATE STREET CORP (827.26K).
Leading sellers of SELLAS Life Sciences stock in December 2025 included MARSHALL WACE, LLP (1.02Mn), SUSQUEHANNA INTERNATIONAL GROUP, LLP (513.82K), GSA CAPITAL PARTNERS LLP (173.94K), MORGAN STANLEY (163.86K), NEW YORK STATE COMMON RETIREMENT FUND (42.40K).
The top 10 institutional holders of SELLAS Life Sciences for the quarter ending December 2025 included VANGUARD GROUP INC (8.47Mn), BlackRock, Inc. (7.54Mn), GEODE CAPITAL MANAGEMENT, LLC (3.08Mn), STATE STREET CORP (2.19Mn), MILLENNIUM MANAGEMENT LLC (1.39Mn), MARSHALL WACE, LLP (1.34Mn), TWO SIGMA INVESTMENTS, LP (1.08Mn), Nuveen, LLC (1.02Mn), NORTHERN TRUST CORP (930.75K), MORGAN STANLEY (890.93K).

105 Institutional Holders

237,782 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	31 Dec, 2025	8,467,400	1,627,495	23.79%	$31,922,098.00
BlackRock, Inc.	31 Dec, 2025	7,541,054	1,854,168	32.60%	$28,429,774.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	3,077,337	812,953	35.90%	$11,604,041.00
STATE STREET CORP	31 Dec, 2025	2,188,171	827,257	60.79%	$8,249,405.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	1,387,849	1,073,147	341.00%	$5,232,191.00
MARSHALL WACE, LLP	31 Dec, 2025	1,340,668	-1,017,331	-43.14%	$5,054,320.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	1,082,207	936,351	641.97%	$4,079,920.00
Nuveen, LLC	31 Dec, 2025	1,023,961	26,051	2.61%	$3,860,333.00
NORTHERN TRUST CORP	31 Dec, 2025	930,750	199,575	27.30%	$3,508,927.00
MORGAN STANLEY	31 Dec, 2025	890,929	-163,862	-15.54%	$3,358,802.00
DAGCO, INC.	31 Dec, 2025	577,540	577,540	0.00%	$2,177,326.00
BARCLAYS PLC	31 Dec, 2025	511,034	328,354	179.74%	$1,926,599.00
Clear Street Group Inc.	31 Dec, 2025	500,000	500,000	0.00%	$1,885,000.00
Everhart Financial Group, Inc.	31 Dec, 2025	466,216	135,066	40.79%	$1,757,634.00
JONES FINANCIAL COMPANIES LLLP	31 Dec, 2025	429,243	428,869	114,670.86%	$1,618,246.00
DIADEMA PARTNERS LP	31 Dec, 2025	424,900	24,900	6.23%	$1,601,873.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	411,654	392,389	2,036.80%	$1,551,936.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	408,401	114,295	38.86%	$1,539,672.00
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	349,755	-513,820	-59.50%	$1,318,577.00
GSA CAPITAL PARTNERS LLP	31 Dec, 2025	345,052	-173,943	-33.52%	$1,301.00

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