DYADIC APPROVED FOR LISTING ON THE AMERICAN STOCK EXCHANGE

May 17, 2005

Dyadic International, Inc - http://www.dyadic-group.com
Alexander (Sasha) Bondar, (561)743-8333, sbondar@dyadic-group.com

JUPITER, Fla. Ü (via Business Wire) Ü Dyadic International, Inc. (OTCBB: DYAD), a biotechnology company, today announced that it has been approved for listing on the American Stock Exchange ("Amex"). Dyadic's common stock is expected to begin trading on the Amex under the ticker symbol "DIL" on May 26, 2005.

"We believe that our listing on the American Stock Exchange will increase the interest in our common stock and result in greater visibility within the investment community," said Mark Emalfarb, Dyadic's Chief Executive Officer. "In addition, a listing on a national exchange should further enhance our credibility with both existing and new partners and customers, as we seek to expand our reach into new markets.æ Equipped with a wealth of new gene information coming from the recent sequencing of Dyadic's proprietary C1 fungal genome, a strong balance sheet and an experienced team in place to advance Dyadic's C1 Host Technology we have spent more than a decade developing, Dyadic is well positioned for future growth."

The Company's American Stock Exchange Specialist will be Weiskopf, Silver & Co.

The approval of the listing of Dyadic's common stock on the Amex is contingent upon Dyadic being in compliance with all applicable listing standards on the date it begins trading on the Amex, and may be rescinded if the company is not in compliance with such standards.

About Dyadic:
Dyadic International, Inc., is engaged in the development, manufacture and sale of biological products (proteins, enzymes, peptides and other bio-molecules), as well as the licensing of its enabling proprietary technology to business collaborators for the discovery, development and manufacture of biological products from genes. Dyadic markets its products and services for applications in the textile, chemical, agricultural, pulp & paper, pharmaceutical, biotechnology and other industries, using its proprietary C1 Host Technology and C1 Expression and Screening Systems for the discovery, development and production of biological products.

Cautionary Statement for Forward-Looking Statements:
Statements contained in this press release may contain information that includes or is based upon certain "forward-looking statements" relating to our business. For a discussion of the factors that could cause actual results to vary from these forward-looking statements, please see our filings from time to time with the Securities and Exchange Commission, which are available free of charge on the SEC's web site at http://www.sec.gov, including our Annual Report on Form 10-KSB for the year ended December 31, 2004, which was filed with the SEC on April 15, 2005, and our Quarterly Report on Form 10-QSB, which was filed on May 17, 2005. We expressly disclaim any intent or obligation to update any forward-looking statements.

Center of Excellence in Biomedical and Marine Biotechnology
777 Glades Road, ADM 215, Boca Raton, FL 33431
ph. 561-297-2651 • fx.561-297-2141 • info@floridabiotech.org