EXHIBIT 4.1

DYADIC INTERNATIONAL, INC.

The following abbreviations, when used in the inscription on the face of this Certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM	-	as tenants in common	UNIF GIFT MIN ACT -			Custodian -
TEN ENT	-	as tenants by the entireties		(Cust)			(Minor)
JT TEN	-	as joint tenants with right of		under Uniform Gifts to Minors
		survorship and not as tenants		Act
		in common			(State)
			UNIF TRF MIN ACT -			Custodian (until age		)
				(Cust)
						Under uniform Transfers
				(Minor)
				to Minors Act
						(State)

Additional abbreviations may also be used though not in the above list.

For value received, hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER

IDENTIFYING NUMBER OF ASSIGNEE

(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING ZIPCODE OF ASSIGNEE)

THE SHARES REPRESENTED BY THIS STOCK CERTIFICATE HAVE BEEN PLEGED AS COLLATERAL FOR A LOAN AND THUS ARE INALIENABLE UNTIL SUCH TIME AS THE LOAN OBLIGATION IS TERMINATED AND THE PLEDGE RELEASED. LEGC156J

	Shares
of the stock represented by the within Certificate, and do hereby irrevocably constitute and appoint
	Attorney
to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises.

Dated
		X
		X
	NOTICE:		THE SIGNATURE(S) TO THIS ASSIGNMENT JUST CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE
			FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE
			WHATEVER.

Signature(s) Guaranteed

By

THE SIGNATURE(S) MUST BE GUARANTED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS,

STOCKBROKERS , SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN

APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E C RULE 17Ad·15.

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE "SECURITIES Acr) AND MAY NOT BE TRANSFERRED EXCEPT IN COMPLIANCE WITH THE REGISTRATION PROVISIONS OF THE SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS. OR PURSUANT TO AN AVAILABLE EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT, THE AVAILABILl1Y OF WHICH IS TO BE ESTABUSHED TO THE SATISFACTION OF THE COMPANY.