Seanergy stake: Konstantakopoulos reports 10.2% ownership

Seanergy Maritime Holdings Corp. Schedule 13G/A reports that Konstantinos Konstantakopoulos and Longshaw Maritime Investments S.A. each beneficially own 2,203,714 shares of common stock, representing 10.2% of the class.

Rhea-AI Filing Summary

Seanergy Maritime Holdings Corp. Schedule 13G/A reports that Konstantinos Konstantakopoulos and Longshaw Maritime Investments S.A. each beneficially own 2,203,714 shares of common stock, representing 10.2% of the class. The percent is calculated using 21,668,198 shares outstanding as of March 31, 2026.

The filing states the shares are held indirectly through Longshaw Maritime Investments S.A.; voting and dispositive power are shared, with no sole voting or dispositive power reported. The filing is signed by Konstantinos Konstantakopoulos.

Insights

Corporate Governance Analyst

Holder reports a 10.2% indirect stake via a Marshall Islands vehicle.

The filing documents 2,203,714 shares held indirectly through Longshaw Maritime Investments S.A., reflecting 10.2% of 21,668,198 shares outstanding as of March 31, 2026. Shared voting and dispositive power are reported; no sole power is claimed.

Key dependencies include any changes to outstanding share count or additional Schedule 13 filings. Subsequent filings will show whether holdings or voting arrangements change.

Key Figures

Shares beneficially owned: 2,203,714 shares Percent of class: 10.2% Shares outstanding (as of): 21,668,198 shares

3 metrics

Shares beneficially owned 2,203,714 shares Konstantinos Konstantakopoulos / Longshaw Maritime

Percent of class 10.2% Calculated using 21,668,198 shares outstanding

Shares outstanding (as of) 21,668,198 shares as reported in Form 20-F filed March 31, 2026

Key Terms

beneficially own, shared dispositive power, indirect ownership

3 terms

beneficially own regulatory

"Amount beneficially owned: 1. Konstantinos Konstantakopoulos - 2,203,714"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

shared dispositive power regulatory

"Shared Dispositive Power 2,203,714.00"

indirect ownership legal

"owns all 2,203,714 shares indirectly through Longshaw Maritime Investments S.A."

FAQ

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

What stake does Konstantinos Konstantakopoulos report in Seanergy (SHIP)?

He reports beneficial ownership of 2,203,714 shares, equal to 10.2% of the class. The percent uses 21,668,198 shares outstanding as of March 31, 2026 as the calculation base.

How are the reported Seanergy shares held by Konstantakopoulos?

All reported shares are held indirectly through Longshaw Maritime Investments S.A.. The filing states he controls Longshaw, resulting in indirect ownership of the 2,203,714 shares reported.

Does Konstantakopoulos have sole voting or dispositive power over these shares?

No. The filing reports 0 sole voting power and 0 sole dispositive power. It lists 2,203,714 shared voting and 2,203,714 shared dispositive power for the position.

What date is used to calculate the percent ownership reported?

The percent ownership is calculated using 21,668,198 shares outstanding as reported in the company's Form 20-F filed on March 31, 2026, per the filing's note.

Who signed the Schedule 13G/A filing for Seanergy (SHIP)?

The filing is signed by Konstantinos Konstantakopoulos with signature dates shown as April 8, 2026, attesting to the information provided about ownership and control.

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

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Accepted by SEC EDGAR 04/08/2026 - 04:18 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 4)

Seanergy Maritime Holdings Corp.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

Y73760400

(CUSIP Number)

03/31/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): Y73760400

1

Names of Reporting Persons

Konstantakopoulos Konstantinos

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

GREECE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,203,714.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,203,714.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,203,714.00

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)

10.2 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: Note to Row 6: Konstantinos Konstantakopoulos owns all 2,203,714 shares indirectly through Longshaw Maritime Investments S.A., a Marshall Islands corporation. Note to Row 11: The percent ownership is calculated based upon an aggregate of 21,668,198 shares outstanding as reported in Seanergy Maritime Holdings Corp.'s Form 20-F filed on March 31, 2026.

SCHEDULE 13G

CUSIP Number(s): Y73760400

1

Names of Reporting Persons

Longshaw Maritime Investments S.A.

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

MARSHALL ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,203,714.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,203,714.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,203,714.00

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)

10.2 %

12

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person: Note to Row 6: Longshaw Maritime Investments S.A. is controlled by Konstantinos Konstantakopoulos, resulting in his indirect ownership of all 2,203,714 shares of common stock of Seanergy Maritime Holdings Corp. Note to Row 11: The percent ownership is calculated based upon an aggregate of 21,668,198 shares outstanding as reported in Seanergy Maritime Holdings Corp.'s Form 20-F filed on March 31, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Seanergy Maritime Holdings Corp.
(b)	Address of issuer's principal executive offices: 154 Vouliagmenis Avenue, Glyfada, Greece, 166 74
Item 2.
(a)	Name of person filing: Konstantinos Konstantakopoulos Longshaw Maritime Investments S.A.
(b)	Address or principal business office or, if none, residence: The principal business office of each person named in Item 2(a) above is: 60 Zephyrou Street & Syngrou Avenue 17564 Athens, Greece
(c)	Citizenship: Konstantinos Konstantakopoulos is a citizen of Greece. Longshaw Maritime Investments S.A. is a Marshall Islands Corporation.
(d)	Title of class of securities: Common Stock, par value $0.0001 per share
(e)	CUSIP No.:
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. Konstantinos Konstantakopoulos - 2,203,714 2. Longshaw Maritime Investments S.A. - 2,203,714
(b)	Percent of class: 1. Konstantinos Konstantakopoulos - 10.2% 2. Longshaw Maritime Investments S.A. - 10.2%
(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. Konstantinos Konstantakopoulos - 2,203,714 2. Longshaw Maritime Investments S.A. - 2,203,714
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1. Konstantinos Konstantakopoulos - 2,203,714 2. Longshaw Maritime Investments S.A. - 2,203,714
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
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 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.

Konstantakopoulos Konstantinos

Signature:	/s/ Konstantinos Konstantakopoulos
Name/Title:	Konstantinos Konstantakopoulos
Date:	04/08/2026

Longshaw Maritime Investments S.A.

Signature:	/s/ Konstantinos Konstantakopoulos
Name/Title:	Konstantinos Konstantakopoulos
Date:	04/08/2026