Company: TEN-PE
Filing Date: 2025-10-30
Form Type: 6-K
Source: 0001193125-25-258668
Chunk: 1

Company: TSAKOS ENERGY NAVIGATION LTD
Filing Date: 2025-10-30
Form: 6-K
Chunk 1
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 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: October 30, 2025

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