Okeanis Eco Tankers (ECO) 6-K ties ex-dividend notice to F-3 shelves

Rhea-AI Filing Summary

Okeanis Eco Tankers Corp. submitted a Form 6-K as a foreign private issuer, mainly to furnish a press release dated August 21, 2025 titled “Okeanis Eco Tankers Corp. – Ex Dividend Date.” The filing signals an update related to the company’s dividend schedule.

The report also states that this 6-K and its exhibit are incorporated by reference into the company’s existing Form F-3 registration statements (File Nos. 333-287032 and 333-287036), linking the dividend-related disclosure to those previously declared effective shelf registrations.

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 August 2025

Commission File Number: 001-41858

Okeanis Eco Tankers Corp.

(Translation of registrant’s name into English)

c/o OET Chartering Inc., Ethnarchou Makariou Ave., & 2 D. Falireos St., 185 47 N. Faliro, 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 x          Form 40-F ¨

INFORMATION CONTAINED IN THIS FORM 6-K REPORT

Attached to this report on Form 6-K as Exhibit 99.1 is a copy of the press release published by Okeanis Eco Tankers Corp. on August 21, 2025, titled “Okeanis Eco Tankers Corp. – Ex Dividend Date.”

This Report and the exhibit(s) hereto are hereby incorporated by reference into the registrant’s registration statements: (A) on Form F-3 (File No. 333-287032), filed with the Securities and Exchange Commission on May 7, 2025 and declared effective date on May 21, 2025 and (B) on Form F-3 (File No. 333-287036), filed with the Securities and Exchange Commission on May 7, 2025 and declared effective date on May 21, 2025.

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.

	Okeanis Eco Tankers Corp.
	By:	/s/ Iraklis Sbarounis
	Name:	Iraklis Sbarounis
	Title:	Chief Financial Officer

Date: August 21, 2025

FAQ

What does Okeanis Eco Tankers Corp. (ECO) report in this Form 6-K?

Okeanis Eco Tankers Corp. reports a Form 6-K mainly to furnish a press release titled “Okeanis Eco Tankers Corp. – Ex Dividend Date.” The filing formally transmits this dividend-related information to U.S. investors under the Securities Exchange Act framework.

How is the August 21, 2025 press release used in Okeanis Eco Tankers’ Form 6-K?

The Form 6-K attaches the August 21, 2025 press release as Exhibit 99.1. This exhibit contains information about the company’s ex-dividend date, and the report makes that disclosure part of the U.S. public record for the foreign private issuer.

How does this Okeanis Eco Tankers (ECO) Form 6-K relate to its F-3 registrations?

The Form 6-K explicitly incorporates the report and its exhibit by reference into two existing Form F-3 registration statements. This means the dividend-related disclosure becomes part of the information base for those effective shelf offerings.

Which registration statements are affected by this Okeanis Eco Tankers Form 6-K?

The report is incorporated by reference into two Form F-3 registration statements with File Nos. 333-287032 and 333-287036. Both were filed on May 7, 2025 and later declared effective, so this new information now supplements those documents.

Who signed the Okeanis Eco Tankers Corp. Form 6-K filed in August 2025?

The Form 6-K was signed on behalf of Okeanis Eco Tankers Corp. by Iraklis Sbarounis. He is identified in the document as the company’s Chief Financial Officer, acting as the duly authorized signatory for this report.