Okeanis Eco Tankers (ECO) sets Q1 2026 dividend with dual-exchange dates

Rhea-AI Filing Summary

Okeanis Eco Tankers Corp. reports that its board of directors has declared a Q1 2026 dividend on the company’s common shares. Because trades on the New York Stock Exchange settle on a T+1 basis and on the Oslo Stock Exchange on a T+2 basis, the two listings will have different ex-dividend dates. The company highlights that shareholders holding shares through Euronext Securities Oslo in Norway should pay close attention to the specific payment mechanics for those VPS-registered shares and are encouraged to consult their bank or broker for details.

Key Figures

Form type: Form 6-K Commission file number: 001-41858 Incorporation date: April 30, 2018 +4 more

7 metrics

Form type Form 6-K Report of foreign private issuer for May 2026

Commission file number 001-41858 U.S. SEC registration reference

Incorporation date April 30, 2018 Date company was incorporated in Marshall Islands

Fleet size 16 tankers Eight Suezmax and eight VLCC scrubber-fitted tankers

Settlement cycle NYSE T+1 Trade settlement basis for ECO shares in New York

Settlement cycle OSE T+2 Trade settlement basis for ECO shares in Oslo

CFO contact phone +30 210 480 4200 Company CFO telephone number

Key Terms

Central Securities Depository Regulation, Euronext Securities Oslo, forward-looking statements, continuing obligations, +2 more

6 terms

Central Securities Depository Regulation regulatory

"Due to implementation of the Central Securities Depository Regulation (“CSDR”) in Norway, shareholders..."

Euronext Securities Oslo financial

"shareholders who hold common shares registered in Euronext Securities Oslo (“VPS”), Norway’s central securities depository..."

forward-looking statements regulatory

"This communication contains “forward-looking statements”, including as defined under U.S. federal securities laws."

Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

continuing obligations regulatory

"This information is published in accordance with the requirements of the Continuing Obligations."

Suezmax tankers financial

"The sailing fleet consists of eight modern scrubber-fitted Suezmax tankers and eight modern scrubber-fitted VLCC tankers."

Suezmax tankers are a class of crude oil ships sized to be the largest vessels that can pass through the Suez Canal when fully loaded. Think of them like the biggest truck that can still fit under a low bridge—large enough to carry a lot of oil but constrained by a key route. Investors watch them because their availability and operating costs help set shipping capacity and freight rates, which influence oil prices, energy company margins, and shipping company cash flow.

VLCC tankers financial

"The sailing fleet consists of eight modern scrubber-fitted Suezmax tankers and eight modern scrubber-fitted VLCC tankers."

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FAQ

What did Okeanis Eco Tankers (ECO) announce regarding its Q1 2026 dividend?

Okeanis Eco Tankers’ board declared a dividend on its common shares for Q1 2026. The company also highlighted that settlement differences between the New York and Oslo exchanges will create different ex-dividend dates for the two listings, affecting when shareholders qualify for payment.

How do settlement cycles affect ECO’s ex-dividend dates on NYSE and OSE?

Trades in ECO shares settle on a T+1 basis on the NYSE and T+2 on the Oslo Stock Exchange. Because of these different settlement cycles, the ex-dividend dates for the Q1 2026 dividend will not match between the two exchanges and must be checked separately.

What should Okeanis Eco Tankers shareholders with VPS-registered shares know?

Shareholders holding ECO common shares registered in Euronext Securities Oslo (VPS) must note the specific payment date information for VPS-registered shares. The company encourages them to contact their bank, broker, nominee, or other institution to understand how and when the dividend will be credited.

Who can ECO investors contact for questions about the Q1 2026 dividend?

Investors can contact CFO Iraklis Sbarounis at Okeanis Eco Tankers by telephone or email for company information. For broader investor relations and media questions, they may reach out to Capital Link, Inc. in New York, which handles ECO’s investor relations communications.

What business does Okeanis Eco Tankers (ECO) operate and what is its fleet?

Okeanis Eco Tankers is an international tanker company transporting crude oil and refined products. The sailing fleet consists of eight modern scrubber-fitted Suezmax tankers and eight modern scrubber-fitted VLCC tankers, listed on both the Oslo Stock Exchange and the New York Stock Exchange.

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 May 2026

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.

x Form 20-F     ¨ Form 40-F

INFORMATION CONTAINED IN THIS REPORT ON FORM 6-K

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 May 13, 2026, titled “Okeanis Eco Tankers Corp. – Key Information relating to Q1 2026 dividend.”

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.

SIGNATURE

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: May 13, 2026

Exhibit 99.1

Okeanis Eco Tankers Corp. – Key Information relating to Q1 2026 dividend

ATHENS, GREECE, May 13, 2026 - Okeanis Eco Tankers Corp. (“OET” or the “Company”) (NYSE: ECO / OSE: OET), announced today that the Company's board of directors (the “Board”) has declared a dividend on its common shares (the “Dividend”).

Due to implementation of the Central Securities Depository Regulation (“CSDR”) in Norway, shareholders who hold common shares registered in Euronext Securities Oslo (“VPS”), Norway’s central securities depository, should please note the information on the payment date to the common shares registered in VPS below.

The New York Stock Exchange (“NYSE”) settles its trades on a T+1 basis, while the Oslo Stock Exchange (“OSE”) settles its trades on a T+2 basis. As a result, there will be different ex-dividend dates between the two exchanges, as set out below.

Key information relating to the Dividend:

· Dividend amount: USD 2.00 per common share.

· Declared currency: USD. Dividends payable to common shares registered in the Euronext VPS will be distributed in NOK.

· Date of Board approval: May 13, 2026.

· Last day including right OSE: May 26, 2026, the last date on which the Company’s common shares trading on the OSE will include the entitlement to the Dividend.

· Last day including right NYSE: May 27, 2026, the last date on which the Company’s common shares trading on the NYSE will include the entitlement to the Dividend.

· Ex-date OSE: May 27, 2026, the date on which the Company’s common shares will begin trading on the OSE without the entitlement to the Dividend.

· Ex-date NYSE: May 28, 2026, the date on which the Company’s common shares will begin trading on the NYSE without the entitlement to the Dividend.

· Record date OSE and NYSE: May 28, 2026

· Payment date: June 5, 2026. Due to the implementation of CSDR in Norway, the Dividend payable on common shares that are registered in the Euronext VPS is expected to be distributed to Euronext VPS shareholders on or about June 10, 2026.

The Company encourages you to contact your bank, broker, nominee or other institution if you have any questions regarding the mechanics and timing of having the Dividend attributable to your common shares credited to your account.

Contacts

Company:

Iraklis Sbarounis, CFO

Tel: +30 210 480 4200

ir@okeanisecotankers.com

Investor Relations / Media Contact:

Nicolas Bornozis, President

Capital Link, Inc.

230 Park Avenue, Suite 1540, New York, N.Y. 10169

Tel: +1 (212) 661-7566

okeanisecotankers@capitallink.com

About OET

OET is a leading international tanker company providing seaborne transportation of crude oil and refined products. The Company was incorporated on April 30, 2018 under the laws of the Republic of the Marshall Islands and is listed on Oslo Stock Exchange under the symbol OET and the New York Stock Exchange under the symbol ECO. The sailing fleet consists of eight modern scrubber-fitted Suezmax tankers and eight modern scrubber-fitted VLCC tankers.

Forward Looking Statements

This communication contains “forward-looking statements”, including as defined under U.S. federal securities laws. Forward-looking statements provide the Company’s current expectations or forecasts of future events. Forward-looking statements include statements about the Company’s expectations, beliefs, plans, objectives, intentions, assumptions and other statements that are not historical facts or that are not present facts or conditions. Words or phrases such as “anticipate,” “believe,” “continue,” “estimate,” “expect,” “hope,” “intend,” “may,” “ongoing,” “plan,” “potential,” “predict,” “project,” “should,” “will” or similar words or phrases, or the negatives of those words or phrases, may identify forward-looking statements, but the absence of these words does not necessarily mean that a statement is not forward-looking. Forward-looking statements are subject to known and unknown risks and uncertainties and are based on potentially inaccurate assumptions that could cause actual results to differ materially from those expected or implied by the forward-looking statements. The Company’s actual results could differ materially from those anticipated in forward-looking statements for many reasons, including as described in the Company’s filings with the U.S. Securities and Exchange Commission (the “SEC”). Accordingly, you should not unduly rely on these forward-looking statements, which speak only as of the date of this communication. Factors that could cause actual results to differ materially include, but are not limited to, the Company’s operating or financial results; the Company’s liquidity, including its ability to service its indebtedness; competitive factors in the market in which the Company operates; shipping industry trends, including charter rates, vessel values and factors affecting vessel supply and demand; future, pending or recent acquisitions and dispositions, business strategy, areas of possible expansion or contraction, and expected capital spending or operating expenses; risks associated with operations; broader market impacts arising from war (or threatened war) or international hostilities; risks associated with pandemics, including effects on demand for oil and other products transported by tankers and the transportation thereof; and other factors listed from time to time in the Company’s filings with the SEC. Except to the extent required by law, the Company expressly disclaims any obligations or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in the Company’s expectations with respect thereto or any change in events, conditions, or circumstances on which any statement is based. You should, however, review the factors and risks the Company describes in the reports it files and furnishes from time to time with the SEC, which can be obtained free of charge on the SEC’s website at www.sec.gov.

This information is published in accordance with the requirements of the Continuing Obligations.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EXHIBIT 99.1 13.6 KB