ATHENS, GREECE, December 4, 2023: Reference is made to the stock exchange
announcement made by Okeanis Eco Tankers Corp. ("OET" or the "Company") on
November 2, 2023 (the "Announcement"), regarding the Company's public filing of
a registration statement with the U.S. Securities and Exchange Commission
("SEC") to list its common shares on the New York Stock Exchange ("NYSE").

The U.S. regulatory review process has concluded. Following this, the Company
has filed an acceleration request asking the SEC to declare its registration
statement effective on December 6, 2023. First day of listing on NYSE is
expected to be on or about December 11, 2023. The Company's registration
statement on Form 20-F is available on www.sec.gov.

TRADING SUSPENSION

As detailed in the Announcement, and due to technical settlement procedures in
the VPS, a trading suspension in the Company's common shares on Oslo Børs will
be required for a period expected to be at least two trading days (the "Trading
Suspension") in connection with the changes to the Company's share registration
structure (described as "Share Registration Conversion" in the Announcement).
The Company will make a request to Oslo Børs to approve the Trading Suspension
prior to implementation of the Share Registration Conversion.

During the Trading Suspension, the Company's common shares will be temporarily
suspended from trading on Oslo Børs. From the perspective of an investor holding
the Company's common shares in the VPS, the last settlement cycle for common
shares traded prior to the Trading Suspension is expected to take place on
December 8, 2023. Investors trading in the Company's common shares prior to
start of the Trading Suspension should not agree to settlement periods that
would provide for settlement after the expected last day of the Trading
Suspension, being December 8, 2023. Any such trades are expected to be
cancelled. 

Following completion of the Share Registration Conversion, the Trading
Suspension will end, and the Company's common shares will resume trading as
normal.

Below are the expected key dates in connection with the Trading Suspension:

-	December 6, 2023: Last day of trading in the Company's common shares on Oslo
Børs prior to the Trading Suspension. All trades done on December 6, 2023 must
be executed with regular settlement T+2 or shorter. 

-	December 7, 2023: First trading day of the Trading Suspension in the Company's
common shares on Oslo Børs.

-	December 8, 2023: Second trading day of the Trading Suspension in the
Company's common shares on Oslo Børs. The Share Registration Conversion is
expected to be completed after Oslo Børs opening hours. 

-	December 11, 2023: Expected end of the Trading Suspension and the Company's
common shares will resume normal trading from start of trading on Oslo Børs with
the same ticker code of "OET". Expected first day of trading in the Company's
common shares on NYSE with the ticker code of "ECO".


The Company will confirm the dates for the expected Trading Suspension in a
separate announcement.

No action will be required by an investor holding common shares in the VPS in
connection with the Share Registration Conversion and investors' registered
holdings in the VPS will continue.

In conjunction with the listing on NYSE, the Company's ticker on Oslo Børs is to
remain "OET". The Company's common shares will continue to trade under the same
ISIN as today (MHY641771016).

ADVISORS

Advokatfirmaet BAHR AS is acting as Norwegian legal advisor to the Company,
Watson Farley & Williams LLP is acting as U.S. legal counsel to the Company and
Fearnley Securities AS is acting as financial advisor to the Company in relation
to the listing on the New York Stock Exchange.

Contact: 
Iraklis Sbarounis, CFO 
Tel: +30 210 480 4200 
ir@okeanisecotankers.com 

This information is subject to the disclosure requirements pursuant to Section
5-12 of the Norwegian Securities Trading Act. 

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 Børs under the symbol OET. The sailing fleet consists of six modern
scrubber-fitted Suezmax tankers and eight modern scrubber-fitted VLCC tankers. 

Forward-Looking Statements 
Matters discussed in this release may contain certain forward-looking statements
relating to corporate affairs, the business, financial performance and results
of the Company and its subsidiaries and/or the industry in which they operate.
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," "intend," "may," "ongoing," "plan," "potential,"
"predict," "project," "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 forward-looking statements contained in
this release, including assumptions, opinions and views of the Company or cited
from third-party sources, are solely opinions and forecasts that are subject to
risks, uncertainties and other factors, including risks described under the
section captioned "Risk Factors," in OET's registration statement on Form 20-F
filed with the SEC on November 2, 2023, which contains additional information
about factors that could affect actual results, including risks relating to the
Company's industry, business operations, financing and liquidity, regulation and
other risks described in the registration statement. The Company's actual
results could differ materially from those anticipated in forward-looking
statements for many reasons.  The Company does not provide any assurance that
the assumptions underlying such forward-looking statements are free from errors,
nor does the Company accept any responsibility for the future accuracy of the
opinions expressed in the presentation or the actual occurrence of the
forecasted developments. No obligations are assumed to update any
forward-looking statements or to conform to these forward-looking statements to
actual results. 

The information, opinions and forward-looking statements contained in this
announcement speak only as at its date and are subject to change without notice.