# EDGAR Filing Document

**Accession Number:** 0001308557
**File Stem:** 0001104659-26-028077
**Filing Date:** 2026-3
**Character Count:** 15764
**Document Hash:** 506dc4a3ec626c47b8e9ad3729353824
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-028077.hdr.sgml**: 20260316

**ACCESSION NUMBER**: 0001104659-26-028077

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260316

**DATE AS OF CHANGE**: 20260316

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Seanergy Maritime Holdings Corp.
- **CENTRAL INDEX KEY:** 0001448397
- **STANDARD INDUSTRIAL CLASSIFICATION:** DEEP SEA FOREIGN TRANSPORTATION OF FREIGHT [4412]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** 1T
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-84905
- **FILM NUMBER:** 26754634

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 154 VOULIAGMENIS AVENUE
- **STREET 2:** GLYFADA
- **CITY:** ATHENS
- **PROVINCE COUNTRY:** J3
- **BUSINESS PHONE:** 30 210 8913507

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 154 VOULIAGMENIS AVENUE
- **STREET 2:** GLYFADA
- **CITY:** ATHENS
- **PROVINCE COUNTRY:** J3

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** seanergy maritime holdings corp.
- **DATE OF NAME CHANGE:** 20081021
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Economou George
- **CENTRAL INDEX KEY:** 0001308557

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** 80 KIFISSIAS AVUNUE
- **CITY:** AMAROUSSION
- **STATE:** J3
- **ZIP:** 15125

## Exhibit 99.2

**Exhibit 99.2**

**TRANSACTIONS**

The following table sets forth all transactions with respect to Common Shares effected in the last sixty days by the Reporting Persons on behalf of the Reporting Persons in respect of the Common Shares, inclusive of any transactions effected prior to the filing hereof, on March 16, 2026. All such transactions were purchases or sales of Common Shares effected in the open market, and the table includes commissions paid in per Common Share prices.

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | &nbsp;&nbsp;Trade Date | &nbsp;&nbsp;Reporting Person Effecting Transaction | &nbsp;&nbsp;Buy/Sell | &nbsp;&nbsp;Quantity | &nbsp;&nbsp;Price ($)<sup>1</sup> |
| &nbsp;&nbsp;1. | &nbsp;&nbsp;03/11/2026 | &nbsp;&nbsp;Sphinx Investment Corp. | &nbsp;&nbsp;Sell | &nbsp;&nbsp;10562 | &nbsp;&nbsp;$13.45 |

---

<sup>1</sup> Prices are rounded to the nearest cent.

### UNITED STATES 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)*

**—**

*(CUSIP Number)*

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

*(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)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Sphinx Investment Corp.** | Name of reporting person<br>**Sphinx Investment Corp.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**1T** | Citizenship or place of organization<br>**1T** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1848534.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1848534.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1848534.00** | Aggregate amount beneficially owned by each reporting person<br>**1848534.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**8.8%** | Percent of class represented by amount in Row (11)<br>**8.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for 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.

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Maryport Navigation Corp.** | Name of reporting person<br>**Maryport Navigation Corp.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**N0** | Citizenship or place of organization<br>**N0** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1848534.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1848534.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1848534.00** | Aggregate amount beneficially owned by each reporting person<br>**1848534.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**8.8%** | Percent of class represented by amount in Row (11)<br>**8.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for 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.

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**George Economou** | Name of reporting person<br>**George Economou** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**J3** | Citizenship or place of organization<br>**J3** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1848534.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1848534.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1848534.00** | Aggregate amount beneficially owned by each reporting person<br>**1848534.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**8.8%** | Percent of class represented by amount in Row (11)<br>**8.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for 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.

**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, J3, 166 74

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.

### 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.

**Reporting Person:** Sphinx Investment Corp.

**Signature:** Kleanthis Costa Spathias

**Name/Title:** By: Levante Services Limited, By: Kleanthis Costa Spathias, Director

**Date:** 03/16/2026

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.

**Reporting Person:** Maryport Navigation Corp.

**Signature:** Kleanthis Costa Spathias

**Name/Title:** By: Levante Services Limited, By: Kleanthis Costa Spathias, Director

**Date:** 03/16/2026

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.

**Reporting Person:** George Economou

**Signature:** George Economou

**Name/Title:** George Economou

**Date:** 03/16/2026