ATHENS, GREECE, 19 November 2025 - Okeanis Eco Tankers Corp. (the "Company" or
"OET") (NYSE: ECO, OSE: OET) is pleased to announce that following strong demand
it has successfully priced an offering  of 3,239,436 new shares of the Company's
common stock, par value USD 0.001 per share (the "Offer Shares"), at a price of
USD 35.50 per Offer Share, raising gross proceeds of USD 114,999,978 (the
"Offering").

The net proceeds from the Offering are expected to be used as partial
consideration for the acquisition of two newbuilding Suezmax vessels (the
"Vessel Acquisitions"), each currently under construction at Daehan Shipbuilding
Co., Ltd., a South Korean shipyard, each from an unrelated third-party seller,
for an acquisition price of USD 97 million per vessel. Each vessel is expected
to be delivered from the shipyard in January 2026, subject to satisfaction of
closing conditions for such delivery. If one or both of the Vessel Acquisitions
do not consummate, the net proceeds from the Offering may be used for general
corporate purposes.

The Offering is expected to be completed by delivery of the allocated Offer
Shares to investors through the Depository Trust Company (DTC) on a delivery vs
payment basis on or about 21 November 2025, subject to the satisfaction of
customary closing conditions, including that the agreements for the Vessel
Acquisitions remaining in full force and effect at the time of closing. The
Offer Shares will be available for trading on New York Stock Exchange once the
Offer Shares have been issued and settlement has taken place, expected on or
about 21 November 2025. 

The Company has considered the Offering in light of the equal treatment
obligations under the Norwegian Securities Trading Act section 5-14, and the
Board is of the opinion that the Offering is in compliance with these
requirements.

The Offering is being made pursuant to the Company's shelf registration
statement on Form F-3 (File No. 333-287032), which was declared effective by the
U.S. Securities and Exchange Commission (the "SEC") on 21 May 2025. The Offering
is being made only by means of a prospectus supplement prepared specifically in
relation to the Offering, which was filed with the SEC under Rule 424(b) under
the U.S Securities Act of 1933 and can be obtained at www.sec.gov. Electronic
copies of the prospectus supplement and related prospectus may also be obtained
by contacting Fearnley Securities AS at prospectus@fearnleys.com or Clarksons
Securities AS at compliance.oslo@clarksons.com. A final prospectus supplement is
expected to filed with the SEC and made available at www.sec.gov.

This announcement is for information purposes only and does not constitute or
form part of an offer to sell or the solicitation of an offer to purchase or
subscribe for securities, nor will there be any sale of the securities in any
jurisdiction in which such offer, solicitation or sale would be unlawful prior
to the registration or qualification under the securities laws of any such
jurisdiction. Any offers, solicitations or offers to buy, or any sales of
securities will be made in accordance with the registration requirements of the
Securities Act of 1933, as amended.

Advisors
Fearnley Securities AS is acting as global coordinator and joint bookrunner, and
Clarksons Securities AS is acting as joint bookrunner, for the Offering
(collectively referred to as the "Managers"). Fearnley Securities AS is not a
U.S. registered broker-dealer, and to the extent that this offering is made
within the United States, its activities will be effected only to the extent
permitted by Rule 15a-6 of the Securities Exchange Act of 1934, as amended or
through its affiliate Fearnley Securities Inc. Clarksons Securities AS is not a
U.S. registered broker-dealer and to the extent that this offering is made
within the United States, its activities will be effected only to the extent
permitted by Rule 15a-6 of the Securities Exchange Act of 1934, as amended or
through its affiliate Clarksons Securities, Inc.

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

This information is considered to be inside information pursuant to article 7 of
the EU Market Abuse Regulation and is subject to the disclosure requirements
pursuant to article 17 of the EU Market Abuse Regulation and section 5-12 the
Norwegian Securities Trading Act.
This stock exchange release was published on the Oslo Stock Exchange by Irene
Chaidemenou, Legal Counsel, Okeanis Eco Tankers Corp., on the date and time
provided.

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. 

Important information
The information contained in this announcement is for background purposes only
and does not purport to be full or complete. No reliance may be placed for any
purpose on the information contained in this announcement or its accuracy,
fairness or completeness.
Neither this announcement nor the information contained herein is for
publication, distribution or release, in whole or in part, directly or
indirectly, in or into or from the Australia, Canada, Japan, Hong Kong, South
Africa or any other jurisdiction where to do so would constitute a violation of
the relevant laws of such jurisdiction. The publication, distribution or release
of this announcement may be restricted by law in certain jurisdictions and
persons into whose possession any document or other information referred to
herein should inform themselves about and observe any such restriction. Any
failure to comply with these restrictions may constitute a violation of the
securities laws of any such jurisdiction.
This announcement does not constitute an offer of securities for sale in the
United States. Securities may not be offered or sold in the United States absent
registration under the Securities Act of 1933, as amended, or an exemption from
registration. Any public offering of securities to be made in the United States
will be made by means of a prospectus that may be obtained from the Company and
that will contain detailed information about the Company and management, as well
as financial statements.
In any EEA Member State, this communication is only addressed to and is only
directed at qualified investors in that Member State within the meaning of the
EU Prospectus Regulation, i.e. only to investors who can receive the offer
without an approved prospectus in such EEA Member State. The expression "EU
Prospectus Regulation" means Regulation (EU) 2017/1129 of the European
Parliament and of the Council of 14 June 2017 (together with any applicable
implementing measures in any Member State).
This communication is only being distributed to and is only directed at persons
in the United Kingdom that are "qualified investors" within the meaning of the
EU Prospectus Regulation as it forms part of English law by virtue of the
European Union (Withdrawal) Act 2018 and that are (i) investment professionals
falling within Article 19(5) of the Financial Services and Markets Act 2000
(Financial Promotion) Order 2005, as amended (the "Order") or (ii) high net
worth entities, and other persons to whom this announcement may lawfully be
communicated, falling within Article 49(2)(a) to (d) of the Order (all such
persons together being referred to as "relevant persons"). This communication
must not be acted on or relied on by persons who are not relevant persons. Any
investment or investment activity to which this communication relates is
available only to relevant persons and will be engaged in only with relevant
persons. Persons distributing this communication must satisfy themselves that it
is lawful to do so.

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