Okeanis Eco Tankers Corp. - Mandatory notification of trade

ATHENS, GREECE, March 21, 2024 - Okeanis Eco Tankers Corp. (the "Company" or"OET") (NYSE:ECO / OSE:OET), has been notified of the following transactions:

On March 21, 2024, Iraklis Sbarounis, Chief Financial Officer of the Company,purchased 2,050 shares of the Company on NYSE at a price of USD 30.17 pershare,and 50 shares of the Company on OSE at a price of NOK 317.64 per share.Following these transactions, Iraklis Sbarounis holds a total of 5,600 sharesinthe Company.

A Primary Insider notification is enclosed.

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 subject to the disclosure requirements pursuant toRegulation EU 596/2014 (MAR) article 19 number 3 and the Norwegian SecuritiesTrading Act section 5-12.

About OETOET is a leading international tanker company providing seabornetransportationof 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 onOslo Børs under the symbol OET and the New York Stock Exchange under thesymbolECO. The sailing fleet consists of six modern scrubber-fitted Suezmax tankersand eight modern scrubber-fitted VLCC tankers.

https://newsweb.oslobors.no/message/614266