[6-K] Seanergy Maritime Holdings Corp. Current Report (Foreign Issuer)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR

15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2025

Commission File Number: 001-34848

SEANERGY MARITIME HOLDINGS CORP.

(Translation of registrant’s name into English)

154 Vouliagmenis Avenue

166 74 Glyfada

Athens, Greece

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

INFORMATION CONTAINED IN THIS REPORT ON FORM 6-K

Attached to this report (this “Report”) on Form 6-K as Exhibit 99.1 is a copy of the press release of Seanergy Maritime Holdings Corp. (the “Company”) dated September 30, 2025, titled “Seanergy Maritime Announces Profitable Sale of a Capesize Vessel and Expiration of Class E Warrants.”

This Report on Form 6-K and the exhibit hereto are hereby incorporated by reference into the Company's Registration Statements on Form F-3 (File Nos. 333-280792, 333-253332, 333-238136, 333-237500, 333-166697 and 333-169813).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: October 3, 2025
	SEANERGY MARITIME HOLDINGS CORP.
	By:	/s/ Stamatios Tsantanis
	Name:	Stamatios Tsantanis
	Title:	Chief Executive Officer