Armistice and Steven Boyd File Schedule 13G/A for SeaStar Medical (4.99%)

Rhea-AI Filing Summary

Armistice Capital, LLC and Steven Boyd filed an amended Schedule 13G reporting collective beneficial ownership of 1,466,096 shares of SeaStar Medical Holding Corp common stock, equal to 4.99% of the class. The filing states Armistice Capital is the investment manager of Armistice Capital Master Fund Ltd., the direct holder, and that Armistice exercises voting and investment power over the Master Fund's holdings; Mr. Boyd, as managing member, is similarly reported. The submission characterizes the position as held in the ordinary course of business and not for the purpose of changing or influencing control.

Positive

• Transparent disclosure of beneficial ownership and voting power by Armistice Capital and Steven Boyd
• Position reported as passive and held in the ordinary course, indicating no declared intent to influence control

Negative

• None.

Insights

Financial Analyst

TL;DR: Armistice reports a 4.99% passive stake in SeaStar Medical, disclosed under Schedule 13G as ordinary-course ownership.

The filing documents a sub-5% position, which is typically treated as non-activist and passive under SEC rules. The ownership is held through an investment fund with Armistice providing voting and investment power, meaning market participants should view this as manager-directed exposure rather than direct corporate control. There are no financing, strategic transactions, or increased ownership triggers reported that would materially change the company’s governance or capital structure.

Corporate Governance Expert

TL;DR: This is a standard Schedule 13G/A disclosure showing manager-declared voting power for compliance and transparency; not a control event.

The statement emphasizes that the position is held in the ordinary course and not intended to influence control, fitting Schedule 13G filing criteria. The Master Fund disclaims direct beneficial ownership due to the investment management agreement, while Armistice and Mr. Boyd report shared voting and dispositive power. For governance implications, a sub-5% passive stake generally does not trigger board engagement obligations or change oversight dynamics absent further accumulation or activism.

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

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Accepted by SEC EDGAR 08/14/2025 - 09:09 PM Learn about SEC filing dates

FAQ

What stake in SeaStar Medical (ICU) did Armistice Capital report?

The filing reports a collective beneficial ownership of 1,466,096 shares, representing 4.99% of SeaStar Medical's common stock.

Does the Schedule 13G/A indicate Armistice Capital intends to control SeaStar Medical?

No. The filing states the shares were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control.

Through what vehicle does Armistice hold the shares?

The shares are directly held by Armistice Capital Master Fund Ltd. and Armistice Capital, as investment manager, reports voting and investment power over those holdings.

Who signed the Schedule 13G/A for Armistice Capital?

The filing is signed by Steven Boyd as Managing Member of Armistice Capital, LLC and also by Steven Boyd individually, dated August 14, 2025.

How many votes does Armistice report for this position?

Armistice and Steven Boyd report shared voting power for 1,466,096 shares and report 0 shares of sole voting power.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

SeaStar Medical Holding Corp

(Name of Issuer)

Common Stock, $0.0001 par value

(Title of Class of Securities)

81256L203

(CUSIP Number)

06/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 81256L203

1

Names of Reporting Persons

Armistice Capital, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,466,096.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,466,096.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,466,096.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.99 %

12

Type of Reporting Person (See Instructions)

IA, OO

SCHEDULE 13G

CUSIP No. 81256L203

1

Names of Reporting Persons

Steven Boyd

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,466,096.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,466,096.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,466,096.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.99 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: SeaStar Medical Holding Corp
(b)	Address of issuer's principal executive offices: 3513 BRIGHTON BLVD, SUITE 410, DENVER, CO, 80216
Item 2.
(a)	Name of person filing: Armistice Capital, LLC Steven Boyd Collectively, the "Reporting Persons"
(b)	Address or principal business office or, if none, residence: Armistice Capital, LLC 510 Madison Avenue, 7th Floor New York, New York 10022 United States of America Steven Boyd c/o Armistice Capital, LLC 510 Madison Avenue, 7th Floor New York, New York 10022 United States of America
(c)	Citizenship: Armistice Capital, LLC - Delaware; Steven Boyd - United States of America
(d)	Title of class of securities: Common Stock, $0.0001 par value
(e)	CUSIP No.: 81256L203
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,466,096
(b)	Percent of class: 4.99 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,466,096
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,466,096 The percentage of Shares reported to be beneficially owned by the Reporting Persons are based on information from the Issuer. Armistice Capital, LLC ("Armistice Capital") is the investment manager of Armistice Capital Master Fund Ltd. (the "Master Fund"), the direct holder of the Shares, and pursuant to an Investment Management Agreement, Armistice Capital exercises voting and investment power over the securities of the Issuer held by the Master Fund and thus may be deemed to beneficially own the securities of the Issuer held by the Master Fund. Mr. Boyd, as the managing member of Armistice Capital, may be deemed to beneficially own the securities of the Issuer held by the Master Fund. The Master Fund specifically disclaims beneficial ownership of the securities of the Issuer directly held by it by virtue of its inability to vote or dispose of such securities as a result of its Investment Management Agreement with Armistice Capital.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The Master Fund, a Cayman Islands exempted company that is an investment advisory client of Armistice Capital, has the right to receive dividends from, or the proceeds from the sale of, the reported securities.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Armistice Capital, LLC

Signature:	/s/ Steven Boyd
Name/Title:	Steven Boyd - Managing Member
Date:	08/14/2025

Steven Boyd

Signature:	/s/ Steven Boyd
Name/Title:	Steven Boyd
Date:	08/14/2025

Exhibit Information

JOINT FILING STATEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement on Schedule 13G, is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G, shall be filed on behalf of each of the undersigned without the necessity of filing additional joint acquisition statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate. Dated: August 14, 2025 Armistice Capital, LLC By: /s/ Steven Boyd Steven Boyd - Managing Member Steven Boyd By: /s/ Steven Boyd