TSAKOS ENERGY NAVIGATION LIMITED 5,400,000 Shares Series F Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Shares $1.00 Par Value Per Share (Liquidation Preference $25.00 per share) UNDERWRITING AGREEMENTUnderwriting Agreement • June 28th, 2018 • Tsakos Energy Navigation LTD • Deep sea foreign transportation of freight • New York
