B. Riley Acts as Co-Manager in $16.8 Million Public Stock Offering for Odyssey Marine Exploration.

LOS ANGELES -- B. Riley & Co., LLC (B. Riley) (www.brileyco.com), a leading independent investment bank which provides a full array of corporate finance, research, sales, and trading services, announced that it has acted as Co-Manager in a $16.8 Million Common Stock Offering for Odyssey Marine Exploration Inc. (Nasdaq: OMEX).

The underwritten public offering included 4,800,000 shares priced at $3.05 per share, plus an overallotment of 720,000 shares priced at $3.05 per share, which was exercised by the underwriters in full. In a press release announced June 21, 2011, the company announced that the offering resulted in total sales of 5,520,000 shares and that the offering closed on June 21, 2011.

Bryant Riley led the banking team on behalf of B. Riley. Craig-Hallum Capital acted as sole book-runner.

The offering was conducted pursuant to an effective shelf registration statement, which is on file with the Securities and Exchange Commission.

Tampa, Florida-based Odyssey Marine Exploration, Inc. is engaged in deep-ocean exploration using innovative methods and state-of-the-art technology. The Company is a world leader in shipwreck exploration, conducting extensive search and archaeological recovery operations on deep-ocean shipwrecks around the world. Odyssey also has a minority ownership stake in Neptune Minerals, a company focused on discovering and commercializing high-value mineral deposits from the ocean floor, and provides proprietary deep-ocean expertise and equipment to Neptune under contract. Odyssey also provides deep-ocean contracting services to governments and companies around the world.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state. Any offer, solicitation or sale will be made only by means of the prospectus supplement and the base prospectus.

ABOUT B. RILEY & CO.

B. Riley & Co. is a leading independent investment bank which provides a full array of corporate finance, research, sales, trading and otcqx dad services to corporate, institutional and high net worth individual clients. Investment banking services include merger and acquisitions advisory to public and private middle market companies, initial and secondary public offerings and institutional private placements. Its Corporate Governance Advisory Services Group is engaged by both companies and investors to help maximize value for shareholders. The firm is recognized for its distinguished Equity Research. Founded in 1997, B. Riley is headquartered in Los Angeles and maintains offices in Newport Beach, San Francisco, Philadelphia and New York. It is a member of FINRA and SIPC. For more information, please visit www.brileyco.com .

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