$CTSO

$5.24 +$0.39 (8.04%) Close

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

Ownership

13F as of Q2 2026 · 3.2M shares outstanding

Who owns CTSO?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 466.1%

Avenir Corp 164.7% · Neuberger Berman Group LLC 62.5%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

0 vs last qtr

Net shares bought

−334.1K

by institutions in Q2 2026

New / sold out

7 / 7

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Neuberger Berman Group LLC +285.7K
Virtu Financial LLC NEW +71.5K

Biggest sellers in Q2 2026

Skylands Capital, LLC −496.1K
BlackRock, Inc. −155.8K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Cytosorbents Corp in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2019–FY2025

+92.9%

+11.58% a year

Each share's claim on the business

−48.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $23.3M

over 7 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+ years90% 3–5 years1% 1–3 years2% Under 1 year7%

Quarterly turnover

4.6%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting CTSO on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
A Avenir Corp	5.2M	164.74%	−26.6K (−0.5%)	≤2021	0.2%
Shares held by quarter Peak holding5.2M (Q4'25) Change over 8 quarters+2.2M Share of the company164.740% Avenir Corp's full portfolio →
NB Neuberger Berman Group LLC	2.0M	62.50%	+285.7K (+17.0%)	≤2021	0.0%
Shares held by quarter Peak holding2.0M (Q2'26) Change over 8 quarters+187.3K Share of the company62.500% Neuberger Berman Group LLC's full portfolio →

Avenir Corp

5.2M

% of company

164.74%

Change vs last qtr

−26.6K (−0.5%)

Held since

≤2021

Neuberger Berman Group LLC

2.0M

% of company

62.50%

Change vs last qtr

+285.7K (+17.0%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Cytosorbents Corp, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting CTSO on Form N-PORT; together they hold 102.6% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$477K	1.3M	40.46%	0.00%	June 30, 2026
NI Neuberger Intrinsic Value Fund Neuberger Berman Equity Funds	$220K	646.5K	20.52%	0.02%	August 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$477K

% of company

40.46%

% of the fund

0.00%

As of

June 30, 2026

Neuberger Intrinsic Value Fund

Neuberger Berman Equity Funds

Position value

$220K

% of company

20.52%

% of the fund

0.02%

As of

August 31, 2026

12 more funds behind a free account

See every fund holding Cytosorbents Corp 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
MP Mariani Peter J Insider	638.1K	20.26%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company20.260% Mariani Peter J's insider activity →
DE Deliargyris Efthymios Insider	473.0K	15.02%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company15.020% Deliargyris Efthymios's insider activity →

Mariani Peter J

Insider

638.1K

% of company

20.26%

Change vs last qtr

—

Held since

—

Deliargyris Efthymios

Insider

473.0K

% of company

15.02%

Change vs last qtr

—

Held since

—

6 more holders behind a free account

See every insider and 5%+ holder of Cytosorbents Corp.

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