Annual Reports & Proxies

Dyadic 2020 Annual Meeting of Shareholders

VIRTUAL MEETING ONLY - NO PHYSICAL MEETING LOCATION

You are cordially invited to attend the 2020 Virtual Annual Meeting of Shareholders ("Annual Meeting") of Dyadic International, Inc. (“Dyadic”). With rising concerns around the spread of COVID-19 in the United States and globally, in order to mitigate health risks, this year's meeting will be conducted in virtual format only. You will not be able to attend the Annual Meeting in person. We believe that a virtual meeting will provide meaningful shareholder access and participation and also protect the health and safety of our shareholders, employees and other stakeholders, and also improve meeting efficiency and reduce costs.

Be sure to review our proxy statement and annual report, which you can view online by visiting www.proxyvote.com or request a free copy by visiting www.proxyvote.com, calling 1-800-579-1639, or emailing sendmaterial@proxyvote.com. If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by an arrow in your Notice Regarding the Availability of Proxy Materials (“Notice”), in the subject line.

Yours truly,

Mark Emalfarb

President and CEO

WHEN: Monday, June 29, 2020 at 10:00 am Eastern Daylight Savings Time

WHERE: www.virtualshareholdermeeting.com/DYAI2020

VOTING: If you were a shareholder as of May 4, 2020, you may:

Your vote is important. Regardless of whether you plan to attend the Annual Meeting, please follow the instructions you received to vote your shares as soon as possible to ensure that your shares are represented at the Annual Meeting.