SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 9)

Seanergy Maritime Holdings Corp.

(Name of Issuer)

Common Shares, par value $0.0001 per share

(Title of Class of Securities)

Y73760400

(CUSIP Number)

Kleanthis Costa Spathias
c/o Levante Services Limited, Leoforos Evagorou 31, 2nd Fl, Office 21
Nicosia, G4, 1066
30 210 8090429

Richard Brand, Kiran Kadekar
White & Case LLP, 1221 Avenue of the Americas
New York, NY, 10022
(212) 819-8200

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

03/16/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. Checkbox not checked

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP Number(s):

Y73760400

Name of reporting person

Sphinx Investment Corp.

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

MARSHALL ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,848,534.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,848,534.00

Aggregate amount beneficially owned by each reporting person

1,848,534.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

8.8 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person:

All reported Common Shares are held by Sphinx Investment Corp. Sphinx Investment Corp. is a wholly-owned subsidiary of Maryport Navigation Corp., which is a Liberian company controlled by Mr. Economou. Based on 20,902,365 shares stated by the Issuer as outstanding as of June 30, 2025 in the Issuer's Report on Form 6-K, filed with the SEC on August 7, 2025.

SCHEDULE 13D

CUSIP Number(s):

Y73760400

Name of reporting person

Maryport Navigation Corp.

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

LIBERIA

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,848,534.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,848,534.00

Aggregate amount beneficially owned by each reporting person

1,848,534.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

8.8 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person:

SCHEDULE 13D

CUSIP Number(s):

Y73760400

Name of reporting person

George Economou

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

GREECE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,848,534.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,848,534.00

Aggregate amount beneficially owned by each reporting person

1,848,534.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

8.8 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person:

SCHEDULE 13D

Item 1.

Security and Issuer

(a)

Title of Class of Securities:

Common Shares, par value $0.0001 per share

(b)

Name of Issuer:

Seanergy Maritime Holdings Corp.

(c)

Address of Issuer's Principal Executive Offices:

154 Vouliagmenis Avenue, Glyfada, GREECE , 166 74.

Item 1 Comment:

This Amendment No. 9 to Schedule 13D (this "Amendment") amends and supplements the Schedule 13D filed on November 24, 2023, as amended and supplemented by Amendment No. 1 to Schedule 13D on December 5, 2023, Amendment No. 2 to Schedule 13D on December 13, 2023, Amendment No. 3 to Schedule 13D on January 10, 2024, Amendment No. 4 to Schedule 13D on January 26, 2024, Amendment No. 5 to Schedule 13D on March 5, 2024, Amendment No. 6 to Schedule 13D on May 31, 2024, Amendment No. 7 to Schedule 13D on June 3, 2024 and Amendment No. 8 to Schedule 13D on October 15, 2024 (the "Initial 13D", and the Initial 13D as further amended and supplemented by this Amendment, the "Schedule 13D") by the Reporting Persons, relating to the common shares, par value $0.0001 per share (the "Common Shares"), of Seanergy Maritime Holdings Corp., a corporation formed under the laws of the Republic of the Marshall Islands (the "Issuer"). Capitalized terms not defined in this Amendment shall have the meanings ascribed to them in the Initial 13D.

Item 4.

Purpose of Transaction

Item 4 of the Initial 13D is hereby supplemented as set forth below. "As previously disclosed, on March 4, 2024, Sphinx, one of the Reporting Persons, commenced litigation in the Republic of the Marshall Islands against Stamatis Tsantanis, Christina Anagnostara, Dimitrios Anagnostopoulos, Elias Culucundis, Ioannis (John) Kartsonas and the Issuer by filing a complaint in the High Court of the Republic of the Marshall Islands (the "High Court"), seeking, among other things, to void and cancel the Series B Preferred Stock issued to Mr. Tsantanis, to cancel the certificate of designation for the Series B Preferred Stock, to prohibit Mr. Tsantanis from exercising the voting rights of the Series B Preferred Stock and to prohibit the Issuer from recognizing any such votes purportedly cast. The High Court rendered a decision in that case, dismissing Sphinx's complaint on the basis that Sphinx lacked standing to bring its claims, on October 28, 2024 and issued a corrected order amending that decision on October 30, 2024 and the Supreme Court of the Marshall Islands rendered a decision in the appeal of such case on February 20, 2026 affirming the High Court's dismissal. In light of the decision of the Supreme Court of the Marshall Islands, as of March 16, 2026, the Reporting Persons no longer intend to seek to change or influence the control of the Company or to change the Company's capital structure or corporate governance."

Item 5.

Interest in Securities of the Issuer

(a)

Item 5(a) of the Initial 13D is hereby amended and restated as set forth below: "(a), (b) The Reporting Persons each may be deemed to beneficially own all of the 1,848,534 Common Shares (the "Subject Shares") reported herein, which represent approximately 8.8% of Issuer's outstanding Common Shares, based on the 20,902,365 shares stated by the Issuer as being outstanding as of June 30, 2025 in the Issuer's Report on Form 6-K, filed with the SEC on August 7, 2025. Sphinx has the sole power to vote or direct the vote of 0 Common Shares; has the shared power to vote or direct the vote of 1,848,534 Common Shares; has the sole power to dispose or direct the disposition of 0 Common Shares; and has the shared power to dispose or direct the disposition of 1,848,534 Common Shares. Maryport has the sole power to vote or direct the vote of 0 Common Shares; has the shared power to vote or direct the vote of 1,848,534 Common Shares; has the sole power to dispose or direct the disposition of 0 Common Shares; and has the shared power to dispose or direct the disposition of 1,848,534 Common Shares. Mr. Economou has the sole power to vote or direct the vote of 0 Common Shares; has the shared power to vote or direct the vote of 1,848,534 Common Shares; has the sole power to dispose or direct the disposition of 0 Common Shares; and has the shared power to dispose or direct the disposition of 1,848,534 Common Shares."

(b)

The response to Item 5(a) of this Amendment No. 9 is incorporated herein by reference.

(c)

Other than as described herein or on Exhibit 99.2 (as amended and restated and filed herewith), which is incorporated herein by reference, no transactions of Common Shares were effected by the Reporting Persons during the past 60 days.

(d)

Except as set forth above in this Item 5, no 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, the Common Shares.

Item 7.

Material to be Filed as Exhibits.

99.1 Joint Filing Agreement, dated September 28, 2023, by and among the Reporting Persons.* 99.2 Trading Data * Previously filed

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.

Sphinx Investment Corp.

Signature:	Kleanthis Costa Spathias
Name/Title:	By: Levante Services Limited, By: Kleanthis Costa Spathias, Director
Date:	03/16/2026

Maryport Navigation Corp.

Signature:	Kleanthis Costa Spathias
Name/Title:	By: Levante Services Limited, By: Kleanthis Costa Spathias, Director
Date:	03/16/2026

George Economou

Signature:	George Economou
Name/Title:	George Economou
Date:	03/16/2026

Amendment: SEC Form SCHEDULE 13D/A filed by Seanergy Maritime Holdings Corp.