Stamatios Tsantanis Increases Stake in United Maritime Corp to 14.62% via Equity Grant

Stamatios Tsantanis, an executive officer of United Maritime Corp (USEA), filed an Amendment No. 3 to Schedule 13D on April 8, 2026, reporting an increase in beneficial ownership. On March 9, 2026, Tsantanis was granted 200,000 shares of Common Stock pursuant to the company's 2022 Equity Incentive Plan. These shares are subject to a vesting schedule: 60,000 shares vest on September 9, 2026; 60,000 shares vest on April 9, 2027; and 40,000 shares vest on September 9, 2027. Following this transaction, Tsantanis beneficially owns 1,394,534 shares, representing approximately 14.62% of the company's 9,538,139 total outstanding shares. The Reporting Person maintains sole voting and investment power over these securities. This filing updates previous disclosures from January 2023, November 2024, and April 2025. No other material changes were reported in the filing regarding the Reporting Person's background or arrangements with the issuer.