ATHENS, GREECE, 21 November 2025 -  Reference is made to the stock exchange
release by Okeanis Eco Tankers Corp. (the "Company", OSE ticker code: "OET",
NYSE ticker code: "ECO") on 19 November 2025 regarding the successful offering
of 3,239,436 new common shares (the "Offer Shares") of the Company at a price of
USD 35.50 per Offer Share, raising gross proceeds of approximately USD 115
million (the "Offering").

The Company has issued the Offer Shares in The Depository Trust Company (the
"DTC") in the United States and such shares will be available for trading on the
New York Stock Exchange on or around 21 November 2025. The Offer Shares may also
be transferred from DTC to Euronext Securities Oslo (the "VPS") in accordance
with the customary arrangements for transfers of the Company's common shares
between DTC and VPS and be traded on Euronext Oslo Børs. Following issuance of
the Offer Shares, the Company has 36,129,436 common shares issued, of which
35,433,544 common shares are deemed outstanding (there are 695,892 common shares
held in treasury), each with a par value of USD 0.001.

Because the Offer Shares have been issued prior to the 2 December 2025 record
date of the previously announced cash dividend of USD 0.75 per common share, the
Offer Shares issued in the Offering are entitled to receive this dividend, and
the total dividend amount to be paid by the Company will be increased
accordingly.

Fearnley Securities AS acted as global coordinator and joint bookrunner, and
Clarksons Securities AS acted as joint bookrunner, for the Offering
(collectively referred to as the "Managers"). Advokatfirmaet BAHR AS acted as
Norwegian legal counsel, and Watson Farley & Williams LLP acted as US legal
counsel, to the Company. Advokatfirmaet Thommessen AS acted as Norwegian legal
counsel, and Seward & Kissel LLP acted as US legal counsel, to the Managers.

The Offer Shares were sold pursuant to a shelf registration statement on Form
F-3 (File No. 333- 287032), previously filed with the Securities and Exchange
Commission (the "SEC") on 7 May  2025 and declared effective on 21 May 2025. The
Offering was made only by means of a prospectus, including a prospectus
supplement prepared specifically in relation to the Offering and filed under
Rule 424(b) under the U.S. Securities Act of 1933, forming a part of the
effective registration statement. A final prospectus supplement and accompanying
prospectus relating to the securities described above were filed with the SEC on
20 November 2025. Copies of the prospectus supplement and the accompanying
prospectus relating to Offering may be obtained at www.sec.gov. A written
prospectus may also be obtained by contacting Fearnley Securities AS at
prospectus@fearnleys.com or Clarksons Securities AS at
compliance.oslo@clarksons.com.

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 six modern scrubber-fitted Suezmax
tankers and eight modern scrubber-fitted VLCC tankers. 

***

This information is subject to disclosure under the Norwegian Securities Trading
Act, Section 5-12.
This announcement shall not constitute an offer to sell or the solicitation of
an offer to buy any securities, nor shall there be any sale of these securities
in any state or jurisdiction in which such offer, solicitation or sale would be
unlawful prior to the registration or qualification under the securities laws of
any such state or jurisdiction.

The distribution of this announcement into jurisdictions other than Norway may
be restricted by law. Persons into whose possession this announcement comes
should inform themselves about and observe any such restrictions. Any failure to
comply with these restrictions may constitute a violation of the securities laws
of any such jurisdiction. This announcement has not been approved by any
regulatory authority.

Forward-Looking Statements
This communication contains "forward-looking statements", including as defined
under applicable laws, such as the US Private Securities Litigation Reform Act
of 1995. 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 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