144 0001385250 XXXXXXXX LIVE 0000798528 ODYSSEY MARINE EXPLORATION, INC. 001-31895 205 S. HOOVER BLVD., SUITE 210 Tampa FL 33609 8138761776 MARK D GORDON Director Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

20956 59095.92 45190598 10/13/2025 NASDAQ Common 12/13/2006 Restricted Stock Units Issuer N 20956 12/13/2006 N/A Y The securities to be sold were acquired upon the vesting of restricted stock units during the period of 12/13/2006 through 12/26/2016. Sales that were executed on October 13, 2025 are being reported on this Form 144 filed on October 14, 2025 given the EDGAR system was not accepting filings on October 13, 2025 in observance of the federal holiday. 10/13/2025 05/15/2025 /s/ Mark D Gordon