UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 6-K
REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO
RULE 13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934
For the month of December 2025
Commission File Number: 001-41858
Okeanis Eco Tankers Corp.
(Translation of registrant’s name into English)
c/o OET
Chartering Inc., Ethnarchou Makariou Ave., & 2 D. Falireos St., 185 47 N. Faliro, Greece
(Address of principal executive office)
Indicate by check mark whether the registrant files or will
file annual reports under cover of Form 20-F or Form 40-F:
Form 20-F
x Form 40-F
¨
INFORMATION CONTAINED
IN THIS FORM 6-K REPORT
Attached to this report on
Form 6-K as Exhibit 99.1 is a copy of the press
release published by Okeanis Eco Tankers Corp. on December 19, 2025, titled “Okeanis
Eco Tankers Corp. – New Financings Update.”
This Report and the exhibit(s) hereto
are hereby incorporated by reference into the registrant’s registration statements: (A) on Form F-3 (File No. 333-287032),
filed with the Securities and Exchange Commission on May 7, 2025 and declared effective on May 21, 2025 and (B) on Form F-3
(File No. 333-287036), filed with the Securities and Exchange Commission on May 7, 2025 and declared effective on May 21,
2025.
SIGNATURES
Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
| Okeanis Eco Tankers
Corp. |
| |
By: |
/s/ Iraklis Sbarounis |
| |
Name: |
Iraklis Sbarounis |
| |
Title: |
Chief Financial Officer |
Date: December 19, 2025
