SELLAS Life Sciences Group Ownership | Who Owns SELLAS Life Sciences Group?

SELLAS Life Sciences Group Ownership Summary

SELLAS Life Sciences Group is owned by 27.16% institutional investors, 0.32% insiders, and 72.53% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 4.66% of SLS shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 3.74% of its assets in SELLAS Life Sciences Group shares.

SLS Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	SELLAS Life Sciences Group	27.16%	0.32%	72.53%
Sector	Healthcare Stocks	486.50%	11.08%	-397.59%
Industry	Biotech Stocks	304.14%	11.08%	-215.23%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	4.59M	4.66%	$10.05M
Vanguard group	2.29M	3.36%	$2.38M
Alyeska investment group	1.48M	3.30%	$1.76M
Marshall wace, llp	2.72M	2.76%	$5.95M
Geode capital management	733.55K	1.07%	$763.17K
Blackrock	430.37K	0.96%	$512.14K
Brooklyn fi	594.92K	0.87%	$677.15K
Opus capital group	238.50K	0.35%	$248.00K
State street	227.73K	0.33%	$236.84K
Anson funds management lp	275.00K	0.28%	$602.25K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Anson funds management lp	275.00K	0.09%	$602.25K
Opus capital group	238.50K	0.03%	$248.00K
Prosperity financial group	16.50K	0.02%	$36.13K
Atom investors lp	54.62K	0.01%	$119.63K
Alyeska investment group	1.48M	0.01%	$1.76M
Private wealth management group	10.00K	0.01%	$21.90K
Xtx topco	76.90K	0.01%	$168.41K
Marshall wace, llp	2.72M	0.01%	$5.95M
Marshall financial group	10.31K	0.00%	$22.37K
Brooklyn fi	594.92K	0.00%	$677.15K

Top Buyers

Holder	Shares	% Assets	Change
Blackrock funding, inc. /de	4.59M	0.00%	4.05M
Marshall wace, llp	2.72M	0.01%	2.70M
Brooklyn fi	594.92K	0.00%	594.92K
Alyeska investment group	1.48M	0.01%	479.07K
Blackrock	430.37K	-	152.15K

Top Sellers

Holder	Shares	% Assets	Change
Anson funds management lp	275.00K	0.09%	-7.30M
Diametric capital, lp	-	-	-160.19K
Prelude capital management	-	-	-58.34K
Virtu financial	-	-	-53.86K
Millennium management	-	-	-46.34K

New Positions

Holder	Shares	% Assets	Change	Value
Brooklyn fi	594.92K	0.00%	594.92K	$677.15K
Ubs group	127.82K	-	127.82K	$132.93K
Intech investment management	46.22K	0.00%	46.22K	$101.22K
Great valley advisor group	20.00K	0.00%	20.00K	$44.00K
Simon quick advisors	20.00K	0.00%	20.00K	$43.80K

Sold Out

Holder	Change
Fmr	-1.00
Qube research	-2.00
Allworth financial lp	-150.00
Wells fargo & company/mn	-301.00
Jpmorgan chase	-5.79K

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	85	77.08%	26,765,779	87.33%	27	10.25%	64	88.24%	8	60.00%
Mar 31, 2025	48	37.14%	14,287,718	110.42%	16	16.45%	34	88.89%	6	20.00%
Dec 31, 2024	35	-	6,790,160	26.08%	9	15.98%	18	-10.00%	5	-
Sep 30, 2024	35	-	5,385,570	32.75%	7	9.63%	20	-16.67%	5	150.00%
Jun 30, 2024	35	6.06%	4,057,046	-47.43%	9	1.57%	24	60.00%	2	-66.67%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	3.76M	3.74%	-516.15K
iShares Russell 2000 ETF	2.27M	2.27%	-43.16K
Vanguard US Total Market Shares ETF	1.69M	1.86%	-
Vanguard Institutional Extnd Mkt Idx Tr	1.09M	1.09%	-544.32K
Nuveen Equity Index R6	847.46K	0.85%	847.46K
iShares Russell 2000 Growth ETF	840.19K	0.84%	-
Fidelity Extended Market Index	517.10K	0.52%	118.89K
Vanguard Russell 2000 ETF	455.31K	0.45%	-30.52K
State St Russell Sm Cap® Indx SL Cl I	336.80K	0.34%	-
Schwab Small Cap Index	239.87K	0.24%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jun 12, 2025	VAN NOSTRAND ROBERT L	-	Buy	$14.80K
May 30, 2025	Wasman Jane	-	Buy	$33.80K
May 22, 2025	Kalin Katherine Bach	-	Buy	$36.00K
Dec 05, 2022	Stergiou Angelos M.	President and CEO	Sell	$16.94K
Dec 05, 2022	Burns John Thomas	Senior VP, Finance & CAO	Sell	$3.00K

Insider Transactions Trends

Date	Buy	Sell
2025 Q2	3	-
2025 Q1	-	-
2024 Q4	-	-
2023 Q4	-	-
2023 Q1	-	-

SLS Ownership FAQ

Who Owns SELLAS Life Sciences Group?

SELLAS Life Sciences Group shareholders are primarily institutional investors at 27.16%, followed by 0.32% insiders and 72.52% retail investors. The average institutional ownership in SELLAS Life Sciences Group's industry, Biotech Stocks , is 304.14%, which SELLAS Life Sciences Group falls below.

Who owns the most shares of SELLAS Life Sciences Group?

SELLAS Life Sciences Group’s largest shareholders are Blackrock funding, inc. /de (4.59M shares, 4.66%), Vanguard group (2.29M shares, 3.36%), and Alyeska investment group (1.48M shares, 3.30%). Together, they hold 11.32% of SELLAS Life Sciences Group’s total shares outstanding.

Does Blackrock own SELLAS Life Sciences Group?

Yes, BlackRock owns 0.96% of SELLAS Life Sciences Group, totaling 430.37K shares as of Jun 2024. This represents 0% of BlackRock's total assets, with a market value of 512.14K$. In the last quarter, BlackRock increased its holdings by 152.15K shares, a 54.69% change.

Who is SELLAS Life Sciences Group’s biggest shareholder by percentage of total assets invested?

Anson funds management lp is SELLAS Life Sciences Group’s biggest shareholder by percentage of total assets invested, with 0.09% of its assets in 275K SELLAS Life Sciences Group shares, valued at 602.25K$.

Who is the top mutual fund holder of SELLAS Life Sciences Group shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of SELLAS Life Sciences Group shares, with 3.74% of its total shares outstanding invested in 3.76M SELLAS Life Sciences Group shares.

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