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PCEliquiditysentimentbreakoutsdowngradesP/E 28.4threadsAAPLSPXvolatilityNDXflowscyclesliquidityestimatesEPS 4.12

Delisting risk

ICU · NASDAQ · Biotechnology

SeaStar Medical (ICU)

Builds extracorporeal immunomodulation cartridges for acute kidney injury care.

$2.90

At close−0.09 (−2.87%)

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Breakdown13F · 13D/G · Form 4

Institutions17 holders · as of Mar 31, 2026	2.99%	131.6K shares
Insiders10 holders · as of Aug 19, 2026	13.18%	581.0K shares
Otherremainder	83.83%	3.69M shares

4.41M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

Two share counts disagree (4.41M in the company's Sep 3, 2026 report, 2.84M elsewhere); stakes use the report.

A stock split fell inside the quarter, so quarter-on-quarter changes are not shown.

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Mitchell P. KopinInsider	10.06%	443,253	13Gfiled May 13, 2026 ↗
Opportunity Master Fund, SPC – Segregated Master Portfolio BInstitution	6.32%	278,436	13Gfiled May 11, 2026 ↗
Geode Capital Management, LLCInstitution	1.26%	55,642	13Fas of Mar 31, 2026
Eric SchlorffInsiderofficer: Chief Executive Officer	1.14%	50,140	Form 4filed Jul 2, 2026 ↗
Vanguard Capital Management LLCInstitution	0.65%	28,791	13Fas of Mar 31, 2026
Kevin ChungInsiderofficer: Chief Medical Officer	0.64%	28,021	Form 4filed Jul 2, 2026 ↗
Jane Street Group, LLCInstitution	0.63%	27,960	13Fas of Mar 31, 2026
John NeumanInsiderdirector	0.37%	16,200	Form 4filed Jul 2, 2026 ↗
Vanguard Fiduciary Trust CoInstitution	0.31%	13,692	13Fas of Mar 31, 2026
Kenneth van HeelInsiderdirector	0.27%	11,940	Form 4filed Jul 2, 2026 ↗
Jennifer A. BairdInsiderdirector	0.24%	10,620	Form 4filed Jul 2, 2026 ↗
Bradford K. TowneInsiderofficer: Principal Accounting Officer	0.21%	9,050	Form 4filed Feb 10, 2026 ↗
Bernadette N. VincentInsiderdirector	0.19%	8,200	Form 4filed Jul 2, 2026 ↗
Michael MessingerInsiderofficer: Chief Financial Officer	0.06%	2,500	Form 4filed Aug 19, 2026 ↗
PNC Financial Services Group, Inc.Institution	0.04%	1,748	13Fas of Mar 31, 2026
Tower Research Capital LLC (TRC)Institution	0.03%	1,395	13Fas of Mar 31, 2026
David A. GreenInsiderofficer: Chief Financial Officer	0.02%	1,032	Form 4filed Sep 9, 2024 ↗
BlackRock, Inc.Institution	0.02%	913	13Fas of Mar 31, 2026
UBS Group AGInstitution	0.02%	793	13Fas of Mar 31, 2026
Advisor Group Holdings, Inc.Institution	0.01%	230	13Fas of Mar 31, 2026
Newedge Advisors, LLCInstitution	0.00%	176	13Fas of Mar 31, 2026
Vanguard Global Advisers, LLCInstitution	0.00%	165	13Fas of Mar 31, 2026
TD Waterhouse Canada Inc.Institution	0.00%	22	13Fas of Mar 31, 2026
Morgan StanleyInstitution	0.00%	20	13Fas of Mar 31, 2026
Sbi Securities Co., Ltd.Institution	0.00%	14	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

17 holders · 131.6K shares

Holder	Shares	% outstanding	Filed
Geode Capital Management, LLC	55.6K	1.26%	May 15, 2026
Vanguard Capital Management LLC	28.8K	0.65%	May 15, 2026
Jane Street Group, LLC	28.0K	0.63%	May 12, 2026
Vanguard Fiduciary Trust Co	13.7K	0.31%	May 8, 2026
PNC Financial Services Group, Inc.	1.7K	0.04%	May 8, 2026
Tower Research Capital LLC (TRC)	1.4K	0.03%	May 15, 2026
BlackRock, Inc.	913	0.02%	May 13, 2026
UBS Group AG	793	0.02%	May 5, 2026

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

Holder	% of class	Shares	Form	Filed
Mitchell P. Kopin	9.99%	443.3K	13G	May 13, 2026 ↗
Opportunity Master Fund, SPC – Segregated Master Portfolio Bincl. Capital LLC, Khatri	6.60%		13G	Nov 14, 2024 ↗
Ayrton Capital LLC	6.52%	278.4K	13G	May 11, 2026 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
Aug 18, 2026	Michael Messingerofficer: Chief Financial Officer	Purchase	750	$3.27	2,500
Dec 19, 2025	Jennifer A. Bairddirector	Purchase	4,200	$0.2351	36,200
Dec 9, 2025	Michael Messingerofficer: Chief Financial Officer	Purchase	14,500	$0.3516	17,500

CongressHouse and Senate disclosures

Not reported.