NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR
INDIRECTLY, IN OR INTO THE UNITED STATES, AUSTRALIA, CANADA OR JAPAN, OR ANY
OTHER JURISDICTION IN WHICH THE RELEASE, PUBLICATION OR DISTRIBUTION WOULD BE
UNLAWFUL. THIS ANNOUNCEMENT DOES NOT CONSTITUTE AN OFFER OF ANY OF THE
SECURITIES DESCRIBED HEREIN.

ATHENS, GREECE, 20 January 2026 - Okeanis Eco Tankers Corp. (together with its
subsidiaries, unless context otherwise dictates, "OET" or the "Company") (NYSE:
ECO, OSE: OET) today announces a contemplated acquisition of two Suezmax tanker
newbuilding resales (the "Vessel Acquisitions"), and a contemplated offering of
new common shares (the "Offering").

The completion of the Vessel Acquisitions are subject to completion of the
Offering, as further described below.

The Vessel Acquisitions 
The Company has entered into two memoranda of agreement, whereby the Company,
pursuant to each individual memorandum of agreement, has agreed to purchase one
newbuilding Suezmax vessel (with an estimated approximate deadweight tonnage of
157,000), currently under construction at Daehan Shipbuilding Co., Ltd., a South
Korean shipyard, being sister vessels to two vessels acquired during January
2026, each from an unrelated third-party seller for an acquisition price of USD
99.3 million per vessel. Each vessel is expected to be delivered from the
shipyard in the second quarter of 2026.  
Each of the Vessel Acquisitions is contingent on, among other things, the
Company raising sufficient capital to fund a portion of the purchase price
through the Offering, as well as the Company obtaining the necessary debt
financing required to fully fund the Vessel Acquisitions beyond equity raised in
the Offering, but the purchase of one vessel is not contingent on the purchase
of the other.

The Offering
In connection with the Vessel Acquisitions, the Company is contemplating an
offering of new common shares (the "Offer Shares") to raise gross proceeds of
approximately USD 115 million. 
The subscription price for the Offer Shares and the total number of Offer Shares
will be determined by the Board of Directors of the Company (the "Board") based
on an accelerated bookbuilding process.
The net proceeds from the Offering are expected to be used to partly finance the
consideration to the sellers in the Vessel Acquisitions. However, if one or both
of the Vessel Acquisitions does not consummate, the net proceeds from the
Offering may be used for general corporate purposes.
The bookbuilding period for the Offering will commence today, 20 January 2026 at
22:15 CET and is expected to close on 21 January 2026 at 11:00 CET. The Company
reserves the right to at any time and in its sole discretion resolve to close or
to extend the application period or to cancel the Offering in part or in whole.
To facilitate an efficient bookbuilding process, a trading halt will be imposed
on the Company's shares that are trading on Euronext Oslo Børs throughout the
bookbuilding period and until final results have been announced, expected on or
about 13:00 CET on 21 January 2026. 

Notification of allocation is expected to take place on or about 21 January 2026
at 13:00 CET. Payment and delivery is expected to take place on 23 January 2026
based on delivery vs payment (DVP, T+2). The Offer Shares will be delivered
through the DTC. 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 through the DTC, expected on 23 January 2026. After delivery of Offer
Shares, such shares may be transferred from DTC to Euronext Securities Oslo (the
"VPS") in accordance with the customary arrangements for transfers of the
Company's shares between DTC and VPS.

The minimum application and allocation amount has been set to the USD equivalent
of EUR 100,000. The Board may however, at its sole discretion, allocate Offer
Shares for amounts below the USD equivalent of EUR 100,000 to the extent
exemptions from the prospectus requirement in accordance with applicable
regulations, including the Norwegian Securities Trading Act and ancillary
regulations, are available. 

Completion of the Offering by settlement of Offer Shares in the Depository Trust
Company (DTC) to investors in the Offering is subject to, among other things,
(i) all corporate resolutions of the Company required to complete the Offering
being validly made, including without limitation, the Board or a committee
thereof approving the allocation and issuance of Offer Shares