Company: TEN-PE
Filing Date: 2025-09-30
Form Type: 6-K
Source: 0001193125-25-225057
Chunk: 0

Company: TSAKOS ENERGY NAVIGATION LTD
Filing Date: 2025-09-30
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549</div>

--12-31

<div align='center'>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 September 2025

JUNE 30, 2025

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 N AVIG ATION LIMITED FORM 6-K</div>

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.

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TSAKOS ENERGY NAVIGATION LIMITED

THREE AND SIX MONTHS ENDED JUNE 30, 2025 AND 2024

MANAGEMENT’S DISCUSSION AND ANALYSIS

Results of operations

(Percentage calculations are based on the actual amounts shown in the accompanying financial statements)

Voyage revenues

Voyage revenue earned for the three months ended June 30, 2025 and 2024:

|                                           |      2025 |     |            |     |      2024 |     |            |
|                                           | $ million |     | % of total |     | $ million |     | % of total |
| Time charter-bareboat                     |       6.0 |     | 3