TSAKOS ENERGY NAVIGATION LIMITED 4,000,000 Shares Series E Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Shares $1.00 Par Value Per Share (Liquidation Preference $25.00 per share) UNDERWRITING AGREEMENTUnderwriting Agreement • April 5th, 2017 • Tsakos Energy Navigation LTD • Deep sea foreign transportation of freight • New York
