New CFO appointed at Tsakos Energy Navigation (TEN) as Durham shifts to advisory role

Rhea-AI Filing Summary

Tsakos Energy Navigation Limited announced a leadership change in its finance team. On March 3, 2026, Paul Durham stepped down as Co-Chief Financial Officer and Chief Accounting Officer, and will continue with the company in an advisory role.

The Board of Directors appointed Theoharrys E. Kosmatos, previously Co-Chief Financial Officer since July 1, 2024, as the new Chief Financial Officer and Chief Accounting Officer, effective March 3, 2026. This consolidates the company’s top finance and accounting responsibilities under a single executive.

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 March 2026

Commission File Number 001-31236

TSAKOS ENERGY NAVIGATION LIMITED

(Translation of registrant’s name into English)

367 Syngrou Avenue, 175 64 P.

Faliro, Athens, 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 ☒    Form  40-F ☐

TSAKOS ENERGY NAVIGATION

LIMITED FORM 6-K

Chief Financial Officer

On March 3, 2026, Paul Durham stepped down as Co-Chief Financial Officer and Chief Accounting Officer of Tsakos Energy Navigation Limited (the “Company” or “TEN”). Mr. Durham will remain with the Company in an advisory role.

The Board of Directors appointed Theoharrys E. Kosmatos, who has served as Co-Chief Financial Officer of the Company since July 1, 2024, as Chief Financial Officer and Chief Accounting Officer of the Company, effective March 3, 2026.

*****

This report on Form 6-K is hereby incorporated by reference into the following Registration Statements of the Company:

• Registration Statement on Form F-3 (No. 333-273740) filed with the SEC on August 4, 2023;

• Registration Statement on Form F-3 (No. 333-234279) filed with the SEC on October 21, 2019;

• Registration Statement on Form F-3 (No. 333-206852) filed with the SEC on September 9, 2015; and

• Registration Statement on Form S-8 (No. 333-279039) initially filed with the SEC on May 1, 2024.

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.

Date: March 6, 2026

TSAKOS ENERGY NAVIGATION LIMITED
By:		/s/ George Saroglou
		George Saroglou
		President and Chief Operating Officer

FAQ

What leadership change did Tsakos Energy Navigation (TEN) disclose in this Form 6-K?

Tsakos Energy Navigation reported that Paul Durham stepped down as Co-Chief Financial Officer and Chief Accounting Officer on March 3, 2026. The filing also notes that he will remain with the company in an advisory role, ensuring continued access to his experience and institutional knowledge.

Who is the new Chief Financial Officer of Tsakos Energy Navigation (TEN)?

The Board appointed Theoharrys E. Kosmatos as Chief Financial Officer and Chief Accounting Officer, effective March 3, 2026. He had served as Co-Chief Financial Officer since July 1, 2024, giving him recent hands-on experience with the company’s financial operations before assuming full responsibility.

What role will former Co-CFO Paul Durham have at Tsakos Energy Navigation (TEN)?

After stepping down as Co-Chief Financial Officer and Chief Accounting Officer on March 3, 2026, Paul Durham will remain with the company in an advisory role. This suggests ongoing involvement, likely providing continuity and support during the transition to the new finance leadership structure.

When did the CFO transition at Tsakos Energy Navigation (TEN) become effective?

The transition became effective on March 3, 2026, the date when Paul Durham stepped down and Theoharrys E. Kosmatos was appointed. The same effective date helps create a seamless handover of Chief Financial Officer and Chief Accounting Officer responsibilities within the company.

How long has Theoharrys E. Kosmatos been in a financial leadership role at Tsakos Energy Navigation (TEN)?

Theoharrys E. Kosmatos has served as Co-Chief Financial Officer since July 1, 2024, before becoming Chief Financial Officer and Chief Accounting Officer on March 3, 2026. This prior co-leadership role indicates he was already closely involved in overseeing the company’s finance function.