$SLS

$12.12 +$0.78 (6.88%) Live

$SLS Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 201.9M shares outstanding

Who owns SLS?

By type of holder

Institutions 35.5% Insiders 1.7% Everyone else 62.8%

Concentration Top 10 holders own 27.1%

BlackRock, Inc. 7.5% · State Street Corp 6.4%

Institutional ownership

35.5%

+8.8 pts vs last qtr

Institutional holders

192

+34 vs last qtr

Net shares bought

+17.8M

by institutions in Q2 2026

New / sold out

64 / 30

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

State Street Corp +4.6M
Anson Funds Management LP NEW +4.5M

Biggest sellers in Q2 2026

Marshall Wace, LLP SOLD OUT −2.0M
Two Sigma Investments, LP SOLD OUT −403.2K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Sellas Life Sciences Group Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+78.2%

+78.18% a year

Each share's claim on the business

−43.9%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $3.52M

over 2 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years67% 3–5 years1% 1–3 years14% Under 1 year17%

Quarterly turnover

26.5%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting SLS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	15.1M	7.46%	+2.9M (+23.5%)	≤2021	0.0%
Shares held by quarter Peak holding15.1M (Q2'26) Change over 8 quarters+14.6M Share of the company7.460% BlackRock, Inc.'s full portfolio →
SS State Street Corp	13.0M	6.44%	+4.6M (+54.8%)	≤2021	0.0%
Shares held by quarter Peak holding13.0M (Q2'26) Change over 8 quarters+12.8M Share of the company6.440% State Street Corp's full portfolio →

BlackRock, Inc.

15.1M

% of company

7.46%

Change vs last qtr

+2.9M (+23.5%)

Held since

≤2021

State Street Corp

13.0M

% of company

6.44%

Change vs last qtr

+4.6M (+54.8%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Sellas Life Sciences Group Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting SLS on Form N-PORT; together they hold 17.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
SS State Street(R) SPDR(R) S&P(R) Biotech ETF SPDR Series Trust	$128M	8.7M	4.29%	1.19%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$87.2M	5.9M	2.93%	0.00%	June 30, 2026

State Street(R) SPDR(R) S&P(R) Biotech ETF

SPDR Series Trust

Position value

$128M

% of company

4.29%

% of the fund

1.19%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$87.2M

% of company

2.93%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Sellas Life Sciences Group Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SA Stergiou Andelos M. Insider	1.8M	0.87%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.870% Stergiou Andelos M.'s insider activity →
CD Cicic Dragan Insider	557.8K	0.28%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.280% Cicic Dragan's insider activity →

Stergiou Andelos M.

Insider

1.8M

% of company

0.87%

Change vs last qtr

—

Held since

—

Cicic Dragan

Insider

557.8K

% of company

0.28%

Change vs last qtr

—

Held since

—

6 more holders behind a free account

See every insider and 5%+ holder of Sellas Life Sciences Group Inc.

Comments