ATHENS, GREECE, 19 November 2025 - Okeanis Eco Tankers Corp. ( "OET" or the
"Company") (NYSE: ECO, OSE: OET) has announced a contemplated offering of new
common shares (the "Offering").

This is a reminder that a trading halt will be imposed on the Company's common
shares that are trading on Euronext Oslo Børs today, 19 November 2025, from
opening of trade until 13:00 CET, to facilitate an efficient bookbuilding
process for the Offering. 

A separate announcement regarding the bookbuilding process for the Offering is
expected to be made later today, prior to commencement of trading of the
Company's shares on Euronext Oslo Børs.  

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 30 April 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 Note
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 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