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Delisting risk

CTSO · NASDAQ · Medical - Devices

CytoSorbents (CTSO)

Develops blood-purification cartridges for critical care and cardiac surgery, commercializing CytoSorb internationally.

$0.3442

Pre-market−0.04 (−10.74%)

At close$0.3856(+14.08%)

Watchlist

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Breakdown13F · 13D/G · Form 4

Institutions50 holders · as of Mar 31, 2026	26.21%	16.47M shares
Insiders6 holders · as of Jun 16, 2026	9.82%	6.17M shares
Otherremainder	63.97%	40.20M shares

62.84M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Avenir CorpInstitution	8.30%	5.22M	13Fas of Mar 31, 2026
Thomas A. Satterfield, Jr.Insider	6.36%	4.00M	13Gfiled Jan 17, 2025 ↗
Granahan Investment Management LLCInstitution	5.76%	3.62M	13Gfiled Feb 14, 2024 ↗
Vanguard Capital Management LLCInstitution	2.99%	1.88M	13Fas of Mar 31, 2026
Skylands Capital, LLCInstitution	2.72%	1.71M	13Fas of Mar 31, 2026
Neuberger Berman Group LLCInstitution	2.68%	1.68M	13Fas of Mar 31, 2026
CM Management, LLCInstitution	2.35%	1.48M	13Fas of Mar 31, 2026
BlackRock, Inc.Institution	1.25%	782,992	13Fas of Mar 31, 2026
Vincent CapponiInsiderofficer: President and COO	1.22%	766,268	Form 4filed Aug 8, 2025 ↗
Geode Capital Management, LLCInstitution	1.13%	707,262	13Fas of Mar 31, 2026
Peter J. MarianiInsiderofficer: Chief Financial Officer	1.02%	638,113	Form 4filed Jun 16, 2026 ↗
Sargent Investment Group, LLCInstitution	0.88%	549,900	13Fas of Mar 31, 2026
Pathstone Holdings, LLCInstitution	0.80%	499,955	13Fas of Mar 31, 2026
Efthymios DeliargyrisInsiderofficer: Chief Medical Officer	0.75%	473,025	Form 4filed Aug 8, 2025 ↗
Vanguard Fiduciary Trust CoInstitution	0.50%	313,856	13Fas of Mar 31, 2026
CIBC Bancorp USA Inc.Institution	0.27%	172,649	13Fas of Mar 31, 2026
State Street CorpInstitution	0.25%	159,293	13Fas of Mar 31, 2026
Michael G. BatorInsiderdirector	0.24%	151,273	Form 4filed Mar 4, 2025 ↗
Alan D. SobelInsiderdirector	0.23%	145,757	Form 4filed Feb 26, 2025 ↗
Advisor Group Holdings, Inc.Institution	0.21%	130,419	13Fas of Mar 31, 2026
UBS Group AGInstitution	0.18%	115,200	13Fas of Mar 31, 2026
Raymond James Financial IncInstitution	0.17%	107,751	13Fas of Mar 31, 2026
NWF Advisory Services Inc.Institution	0.17%	104,139	13Fas of Mar 31, 2026
Renaissance Technologies LLCInstitution	0.16%	100,720	13Fas of Mar 31, 2026
Morgan StanleyInstitution	0.16%	100,169	13Fas of Mar 31, 2026

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more · Form 4 — an insider's transaction report

Institutions13F, as of Mar 31, 2026

50 holders · 16.47M shares · 10 new positions · 19 increased · 12 reduced · 11 closed

Holder	Shares	% outstanding	Chg q/q	Filed
Avenir Corp	5.22M	8.30%	−14.3K	May 14, 2026
Vanguard Capital Management LLC	1.88M	2.99%	+1.88Mnew	May 15, 2026
Skylands Capital, LLC	1.71M	2.72%	−147.0K	Apr 22, 2026
Neuberger Berman Group LLC	1.68M	2.68%	+57.4K	May 14, 2026
CM Management, LLC	1.48M	2.35%	0	May 8, 2026
BlackRock, Inc.	783.0K	1.25%	+12.4K	May 13, 2026
Geode Capital Management, LLC	707.3K	1.13%	+103.5K	May 15, 2026
Sargent Investment Group, LLC	549.9K	0.88%	−62.1K	May 11, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
Avenir Corp	8.30%	5.23M	13G	Feb 13, 2026 ↗
Thomas A. Satterfield, Jr.	6.56%	4.00M	13G	Jan 17, 2025 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
Jun 15, 2026	Peter J. Marianiofficer: Chief Financial Officer	Purchase	100,000	$0.4400	638,113
Jun 12, 2026	Phillip P. Chandirector, officer: Chief Executive Officer	Purchase	251,136	$0.4000	1,734,099
Jun 15, 2026	Phillip P. Chandirector, officer: Chief Executive Officer	Purchase	10,333	$0.4300	1,744,432

CongressHouse and Senate disclosures

Not reported.