NasdaqHealth CareSurgical & Medical Instruments & ApparatusDENVER, CO

SeaStar Medical Holding Corporation ICU

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Estimated market cap $4.46M5.32M shares, shares as of Nov 1, 2026CIK 1831868

Insider trades, 12 mo

3 buys · 0 sells

$8,536 bought, open market

Congress trades, 24 mo

—

No disclosed trades

13F holders, Q3 2026

4.0% of shares · 3 added

13F holders

…

Lobbying, 12 mo

—

No lobbying filings

Federal contracts, 12 mo

—

None matched

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Latest 10-Q

Q3 2026

What changed in SeaStar Medical Holding Corporation's latest quarterly report, compared with the one before.

Filed Nov 12, 2026 · Quarter ended Sep 30, 2026

Compared with the 10-Q for the quarter ended Jun 30, 2026. Sections compared: management's discussion, risk factors, legal proceedings and controls and procedures.

Read the 10-Q on sec.gov ↗Filing index ↗

Latest 10-Q

What changed in SeaStar Medical Holding Corporation's latest quarterly report, compared with the one before.

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Insider trades

3 in 12 mo

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

No open-market insider trades reported since Aug 18, 2026. Insiders have two business days to file.

Recent insider trades

Michael Messinger Chief Financial Officer	Aug 18 Form 4 ↗	Buy	+$2,453 750 sh @ $3.27	-73.2%
Jennifer A. Baird Director	Dec 19, 2025 Form 4 ↗	Buy	+$1,008 4,200 sh @ $0.24	-76.6%
Michael Messinger Chief Financial Officer	Dec 9, 2025 Form 4 ↗	Buy	+$5,075 14,500 sh @ $0.35	-86.9%
Kenneth Van Heel Director	Aug 27, 2025 Form 4 ↗	Buy	+$8,600 10,000 sh @ $0.86	-106.8%
Kenneth Van Heel Director	Aug 26, 2025 Form 4 ↗	Buy	+$22.3K 25,000 sh @ $0.89	-107.6%

All ICU insider trades →Planned sales (Form 144): see notices

Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

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13F holders

210,885 shares

16 funds report ICU. Values checked against market prices.

Funds own 3.6% of shares (Q2 2026)

18 funds hold the stock.

Q3 2026: 4.0% · 5,560 of ~8,900 funds reported so far

Q4 2025<0.1%
Q1 20263.3%
Q2 20263.6%
Q3 2026 (so far)4.0%

Q3 2026. 2 new, 3 added to, 1 trimmed, 5 exited since Q2 2026.

Top 13F holders
#
1	LPL Financial LLC 13F ↗	66,801	$263.2K	New
2	Geode Capital Management, LLC 13F ↗	51,009	$201.0K	+2.9%
3	Vanguard Capital Management LLC 13F ↗	33,091	$130.4K	unchanged
4	UBS Group AG 13F ↗	26,614	$104.9K	-15.2%
5	Vanguard Fiduciary Trust Co 13F ↗	13,692	$53.9K	unchanged
6	HRT Financial LP 13F ↗	12,579	$49.0K	n/a
7	PNC Financial Services Group, Inc. 13F ↗	4,943	$19.5K	unchanged
8	BlackRock, Inc. 13F ↗	913	$3,597	unchanged
9	Barclays plc 13F ↗	633	$2,494	+15725.0%
10	Osaic Holdings, Inc. 13F ↗	195	$699	unchanged

One of these funds reports its values in thousands of dollars; its figures are shown in dollars.

Download CSV Every fund that holds ICU, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.

13F holders

Funds that report this stock, checked against market prices.

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Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

No recent congressional trades for this company.

Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

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Lobbying

What SeaStar Medical Holding Corporation and its lobbying firms report each quarter.

No recent lobbying filings for this company.

Lobbying

What SeaStar Medical Holding Corporation and its lobbying firms report each quarter.

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Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

Funds holding the stock

Shares they report, adjusted for splits

Funds holding the stock by quarter

Q4 2025	2	—	20	$49
Q1 2026	17	+15	131,570	$489.4K
Q2 2026	18	+1	158,608	$582.1K
Q3 2026	16	-2	210,885	$830.3K

Each point is a quarter-end, from Q4 2025 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.

Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.

The history follows the company's current CUSIP number (81256L302). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q4 2025) can be later than the stock's first appearance in 13F reports.

Share counts are adjusted for stock splits (1-for-10 on Jan 5, 2026): reports from before a split are multiplied by its ratio, so every quarter is on the share count of Q3 2026.

A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

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More filings and data

Each opens the table.

Ownership stakes4 in 12 mo 8-K events3 in 90 days Patents1 patent granted Short interestFINRA · updated Oct 15 Planned insider salesNone in 12 mo Executive payNone on record Wikipedia attentionNone on record SEC enforcementNone on record Clinical trials3 active IPO history10 registrations Ownership stakes…8-K events…Patents…Short interest…Planned insider sales…Executive pay…Wikipedia attention…SEC enforcement…

About the company

The basics from the company’s SEC registration.

Legal name: SeaStar Medical Holding Corp
Address: 3513 BRIGHTON BLVD, SUITE 410, DENVER, CO 80216
Phone: 844-427-8100
Fiscal year ends: Dec 31
Filer category: Non-accelerated filer, smaller reporting company, emerging growth company
Incorporated in: DE
Listed as: ICU (Nasdaq), ICUCW (Nasdaq)
Former names: LMF Acquisition Opportunities Inc (until 2022)
SEC filings: All filings on SEC EDGAR ↗

About the company

The basics from the company’s SEC registration.

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$0.8384−$0.21 (−20.15%) Nov 13 close

1M3M1Y

Oct 13, 2026Low $0.8384 · High $3.59Nov 13, 2026

Aug 13, 2026Low $0.8384 · High $4.69Nov 13, 2026

Nov 13, 2025Low $0.8384 · High $5.08Nov 13, 2026

Congress purchase Congress sale Insider sale over $1M

Adjusted for stock splits; not for dividends. The stock split 1-for-10 on Jan 5, 2026; earlier prices are shown divided by the split ratio. Where prices come from.

Live chart

Intraday and historical prices from TradingView. Quotes may be delayed.

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Information, not investment advice. Company matching is automatic; check the source before relying on one row.