Okeanis Eco Tankers (NYSE: ECO) details ex-dividend date in new Form 6-K

Rhea-AI Filing Summary

Okeanis Eco Tankers Corp. filed a Form 6-K as a foreign private issuer for December 2025. The submission furnishes a press release dated December 1, 2025 titled “Okeanis Eco Tankers Corp. – Ex Dividend Date,” informing the market about the timing of an upcoming ex-dividend date. The company also states that this report and its exhibit are incorporated by reference into its two existing shelf registration statements on Form F-3, which were filed on May 7, 2025 and declared effective on May 21, 2025. The report is signed on behalf of the company by Chief Financial Officer Iraklis Sbarounis.

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 December 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 December 1, 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 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 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: December 1, 2025

FAQ

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

The company furnishes a press release titled “Okeanis Eco Tankers Corp. – Ex Dividend Date” dated December 1, 2025, and files it as an exhibit to this Form 6-K.

What is the main topic of the Okeanis Eco Tankers (ECO) press release attached to the Form 6-K?

The attached press release addresses the ex-dividend date for Okeanis Eco Tankers Corp., indicating when the companys shares begin trading without the right to the declared dividend.

How is this Okeanis Eco Tankers (ECO) Form 6-K used in relation to its Form F-3 registrations?

Okeanis Eco Tankers states that this Form 6-K and its exhibit are incorporated by reference into its two effective Form F-3 registration statements, allowing the information to become part of those shelf registration documents.

Which registration statements are referenced in Okeanis Eco Tankers Corp. (ECO) Form 6-K?

The report is incorporated by reference into two Form F-3 registration statements with file numbers 333-287032 and 333-287036, each filed on May 7, 2025 and declared effective on May 21, 2025.

Who signed the Okeanis Eco Tankers Corp. (ECO) Form 6-K?

The Form 6-K is signed on behalf of Okeanis Eco Tankers Corp. by Iraklis Sbarounis, who serves as the companys Chief Financial Officer.

Does this Okeanis Eco Tankers (ECO) Form 6-K contain detailed financial results?

No, this report primarily furnishes an ex-dividend date press release and notes incorporation into existing Form F-3 registration statements; it does not present financial statements or earnings data.