SeaStar Medical CFO buys 750 shares at $3.27

SeaStar Medical Holding Corp (ICU) reported that Chief Financial Officer Michael Messinger purchased 750 shares of Common Stock on August 18, 2026 in an open market or private transaction at $3.27 per share.

Rhea-AI Filing Summary

SeaStar Medical Holding Corp (ICU) reported that Chief Financial Officer Michael Messinger purchased 750 shares of Common Stock on August 18, 2026 in an open market or private transaction at $3.27 per share. Following this purchase, he directly owns 2,500 shares of SeaStar Medical common stock.

Insider Trade Summary

Net Buyer: 750 shares

Net Buy 1 txn

Insider Messinger Michael

Role Chief Financial Officer

Bought 750 shs ($2K)

Type	Security	Shares	Price	Value
Purchase	Common Stock, par value $0.0001	750	$3.27	$2K

Holdings After Transaction: Common Stock, par value $0.0001 — 2,500 shares (Direct)

Key Figures

Shares purchased: 750 shares Purchase price: $3.27 per share Post-transaction holdings: 2,500 shares +1 more

4 metrics

Shares purchased 750 shares Non-derivative Common Stock purchase on August 18, 2026

Purchase price $3.27 per share Price for the 750-share Common Stock purchase

Post-transaction holdings 2,500 shares Total Common Stock directly owned after the transaction

Par value $0.0001 per share Par value of SeaStar Medical Common Stock

Key Terms

non-derivative, open market or private transaction, Common Stock, par value $0.0001

3 terms

non-derivative financial

"The transaction is classified as a <b>non-derivative</b> security transaction."

open market or private transaction financial

"Code P indicates a purchase in an <b>open market or private transaction</b>."

Common Stock, par value $0.0001 financial

"The security acquired was <b>Common Stock, par value $0.0001</b> per share."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ICU report for CFO Michael Messinger?

SeaStar Medical (ICU) reported that CFO Michael Messinger purchased 750 shares of Common Stock on August 18, 2026. The transaction was coded as a “P” open market or private transaction and increased his direct holdings.

How many ICU shares did the CFO buy and at what price?

CFO Michael Messinger bought 750 ICU shares at a price of $3.27 per share. The filing characterizes this as a purchase in an open market or private transaction, indicating a standard non-derivative stock acquisition.

What are the CFO’s total ICU holdings after this transaction?

After the reported transaction, CFO Michael Messinger directly holds 2,500 shares of SeaStar Medical common stock. This figure reflects his post-transaction ownership as disclosed in the Form 4 for the August 18, 2026 purchase.

Was the ICU insider purchase made under a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox is not affirmed, meaning the transaction is not reported as made under a Rule 10b5-1 trading plan. No footnotes describe any pre-arranged trading arrangement for this purchase.

What type of security did the ICU CFO acquire in this Form 4?

CFO Michael Messinger acquired Common Stock, par value $0.0001 of SeaStar Medical Holding Corp. The transaction is classified as non-derivative, indicating it involved direct shares rather than options or other derivative securities.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/19/2026 - 04:22 PM Accepted by SEC EDGAR 08/19/2026 - 04:21 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Messinger Michael

(Last) (First) (Middle)

3513 BRIGHTON BLVD

SUITE 410

(Street)

DENVER COLORADO 80216

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SeaStar Medical Holding Corp [ ICU ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.0001	08/18/2026		P		750	A	$3.27	2,500	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Michael Messinger	08/19/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)